-
Engineering and microstructural properties of self-compacting concrete containing coarse recycled concrete aggregate Mag. Concr. Res. (IF 2.7) Pub Date : 2024-04-14 Dinesh Kumar, Kanta Rao, P. Lakshmy
In this paper, the possibility of utilizing coarse recycled concrete (CRCA) aggregate obtained from a Construction and Demolition Waste (CDW) Plant in Delhi for making a 60 MPa Self compacted concrete (SCC) was evaluated. The CRCA was used in as-collected condition and was not processed any further. Aggregate Packing (bulk) Density (APD) method was adopted to obtain an aggregate mixture exhibiting
-
Modelling chloride diffusion in concrete with carbonated surface layer Mag. Concr. Res. (IF 2.7) Pub Date : 2024-04-05 Ping Li, Chuanfei Li, Dawang Li, Runhao Chen, Jinghong Chen
Due to the demand for carbon neutrality, concrete carbonation has been reconsidered as an interesting topic because of its potential for capturing CO2 from the atmosphere. Concrete carbonation can significantly modify the chemical and microstructure properties of concrete and thus will have important effects on chloride diffusion. This paper presents a chloride diffusion model in which the concrete
-
From risk study to field evidence: an unprecedented and isolated case of DEF in Brazil Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-29 Igor Ferraz Torres, Sandro Marden Torres, Tibério Andrade
This paper presents the first case ever reported in Brazil where delayed ettringite formation (DEF) has been confirmed as the sole cause of deterioration in field concrete. Still under construction and with less than 2 years of age, numerous cracks were observed in the foundation structures of a building located in Recife, a city known for its history of alkali-aggregate reaction (AAR) cases. In addition
-
Shear friction capacity of monolithic construction joints reinforced with self-prestressing reinforcing steel bars Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-27 Yeon-Back Jung, Ju-Hyun Mun, Sanghee Kim, Seung-Hyeon Hwang, Jae-Il Sim
This study examined the shear friction capacity of a monolithic concrete interface reinforced with newly developed self-prestressed reinforcing steel bars (SPRBs). Twelve push-off specimens with SPRBs were prepared according to the different compressive strengths of concrete (f′c) by applying compressive stresses (σx) on a monolithic concrete interface. To compare the shear friction capacities of monolithic
-
Probabilistic effect of non-potable mixing water on characteristic strength of concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-26 Saha Dauji
Across the world, the acceptance criterion for concrete made with non-potable water (SA) is stipulated for mean strength with reference to similar concrete made with potable water (SP). The basis for the strength design of concrete is the characteristic strength. The effect of the acceptance criteria on the characteristic strength of SA and SP was examined using statistical simulations, for the first
-
The influence of graphene nanoplatelets’ content on sustainable concrete mechanical properties and microstructure Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-23 Mohamed O. Mohsen, Mervat O. Aburumman, Malak M. Al-diseet, Mu'tasim Abdel-Jaber, Ramzi Taha, Mohamed S. Al Ansari, Ahmed Senouci, Ala Abu Taqa
This paper investigates the effect of Graphene Nanoplatelets’ (GNPs) content on sustainable concrete mechanical properties and microstructure. Aqueous solutions were prepared using a wet-dispersion technique to disperse GNPs in the mixing water. Concrete batches were prepared using GNPs-to-cement ratios of 0.05, 0.1, 0.25, 0.5, 1 and 2 %. The 28 day compressive, flexural, and tensile strengths of the
-
Performance of reactive powder concrete with different fibres after high-temperature exposure Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-20 Parameshwar Hiremath
Reactive powder concrete (RPC) is used in structures such as radioactive storage plants, tall buildings and power plants. The performance of RPC after high-temperature exposure is therefore important. RPC (110 MPa) was prepared with different fibres (polypropylene fibres (PPF), polyester fibres (PEF) and their combination) at an optimum fibre dosage of 0.5% by weight of cement. The fibre-reinforced
-
Comparison of fresh and hardened properties of concrete made with various artificial and natural sands Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-20 Duc-Trong Nguyen, Duy-Liem Nguyen
Concretes made with different fine aggregates (natural river sand, artificial crushed sand, artificial gravel sand and a hybrid sand (50% river sand and 50% gravel sand by mass)) were experimentally investigated. The concretes were found to have little differences in compressive strength and elastic modulus (less than 6.4%). Compared with the concrete made with natural river sand, the concretes made
-
Synergism of steel fibres and PVA fibres on the fracture and mechanical properties of ultra-high-performance concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-20 Junxia Liu, Shujie Zang, Fei Yang
The influence of the volume fraction (VF) of steel fibres, polyvinyl alcohol (PVA) fibres and their combination on the mechanical and fracture mechanical properties of ultra-high-performance concrete (UHPC) was studied. To analyse the synergistic effect of steel fibres and PVA fibres on the deformation properties of UHPC, the gain ratios (the ratios of the mechanical properties of UHPC reinforced with
-
A simplified numerical model for the temperature profile of early-age concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-20 Aocheng Zhong, Massoud Sofi, Elisa Lumantarna, Zhiyuan Zhou, Priyan Mendis
The issue of early-age concrete cracking is challenging and relies on the state of concrete soon after it is placed in the formwork. The concrete state is a function of the strains associated with thermal and other dilatations and the level of in situ strength. Both strain and strength primarily require information on the temperature–time history of the concrete element. For larger elements, the thermal
-
Experimental and numerical investigations on fracture energy of double-helix macro BFRP fiber-reinforced concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-18 Chunlei Zhang, Xuejie Zhang
A novel type of fiber, the double-helix macro BFRP (Basalt Fiber Reinforced Polymer) fiber, has been proposed to effectively increase the cracking, tensile strength, and ductility of concrete. BFRP material offers high tensile strength, good corrosion resistance, and low costs, while the double-helix geometry provides excellent bond-slip performance for the fiber and concrete matrix. This study conducted
-
Physio-chemical, mechanical and fracture analysis of ultra-high-performance cementitious composite Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-13 Awadhesh Sharma, Mohd. Ashraf Iqbal, Sonalisa Ray
The aim of this research was to develop cost-effective and environmentally friendly ultra-high-performance concrete (UHPC) using fly ash (FA) and quartz powder (QP) as sustainable cement replacements. The performance of the various constituents was examined and their influence on fresh and hardened properties was investigated in order to determine the optimum trial mix design. A cube compressive strength
-
Influence of high temperatures on modes I and II fracture toughness and energy of nanoclay-reinforced polymer concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-13 Ali Abdi Aghdam, Mostafa Hassani Niaki
This paper investigates the influence of exposure to elevated temperatures on the fracture mechanics of polymer concrete (PC). The PC was synthesised using epoxy, silica sand, crushed basalt, and nanoclay. The prepared PC was exposed to temperatures of 24, 40, 60, 80, 100, 120 and 140°C for two hours, and the residual fracture toughness and fracture energy in mode I and mode II were studied. The three-point
-
Impacts of interfacial bonding between concrete substrate and cast/sprayable HPFRCC on flexural behaviour Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-11 Sajjad Mirzamohammadi, Masoud Soltani
The performance of repair materials is greatly enhanced by the integrity of the rehabilitation system, which depends on the behaviour of the boundary or interface bond between the repair material and the concrete substrate. The current study investigated the effect of implementation method of repair materials (cast or spray method), spraying direction, and concrete substrate roughness on the interfacial
-
Influence of hydraulic pressure on pore structure evolution and chloride transport in concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-11 Jie-jing Chen, Jin Xia, Renjie Wu, Yu Peng
To study the influence of hydraulic pressure on pore structure evolution and chloride transport behavior in concrete, the mass transport depth, chloride concentration, and pore characteristics of specimens with different water-cement ratios were investigated using silver nitrate spraying, potentiometric titration, the mercury intrusion porosimetry (MIP) method, N2 adsorption method, and laser confocal
-
Shear contribution of beams having different structural sizes strengthened in shear with anchored CFRP strips Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-11 Xuan'ang Jiang, Liu Jin, Peng Qin, Maoxin Xia, Xiuli Du
CFRP (Carbon Fiber Reinforced Plastics) debonding jeopardizes structural reinforcement in engineering projects. Anchoring CFRP paste is crucial for efficient shear strengthening. This study investigates the anchoring effect on shear resistance in nine CFRP U-wrapped concrete beams, varying shear span-to-depth ratios (1.0, 1.5, 2.0), and depths from 300 mm to 900 mm. Concurrently, nine unanchored beams
-
Experimental investigation of the seismic behaviour of eccentric RC beams with different reinforcement configurations Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-02 Tai-Kuang Lee, Cheng-Cheng Chen, Guo-Luen Huang
In reinforced concrete (RC) buildings, the seismic behaviour of RC beams with flush outside faces of beams and columns has not been verified by experiments. In this study, four large RC beam specimens were fabricated and an experimental verification was conducted. The results showed that all of the specimens (including three beam specimens with flush outside faces of beams and columns) could withstand
-
Confinement mechanism of cross-shaped steel reinforced concrete columns Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-02 Hong Xiang, Fuyu Mao, Chen Wu, Shenglan Ma
A novel confined concrete constitutive model for steel-reinforced concrete (SRC) columns with cross-shaped steel (CSS) sections is proposed. The model is based on the similar characteristics of descending branches in the stress–strain curves of confined and unconfined concrete (UCC), considering confinement degradation caused by buckling of the steel section or longitudinal reinforcement. The confined
-
Correlation between the automated slump test and the rheological properties of Portland cement mortars Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-01 João Batista Pereira, Geraldo de Freitas Maciel
The aim of this work was to conduct a rheological assessment of mortars based on the automated slump test. Using this test to monitor the transient and permanent regime of slump and its spread, the parameters were correlated with the rheological properties of the mortars. Based on dimensionless slump/spread, yield stress and viscosity, empirical models were developed for obtaining rheological parameters
-
Study on critical crack length of wet-sieved and fully graded concrete under mode I loading Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-01 Xingyu Zheng, Zhimin Wu, Mengdi Jia
The critical crack lengths of wet-sieved concrete and fully graded concrete obtained from experimental measurements, numerical simulation and an analytical solution based on linear elastic fracture mechanics were quantitatively compared. Experiments were conducted on wedge-splitting specimens with depths of 200–1500 mm and a maximum aggregate size of 150 mm. Strain gauges and clip gauges were pasted
-
Effect of recycled aggregate treatment methods by pristine graphene on mechanical and durability properties of concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-01 Aliakbar Gholampour, Massoud Sofi, Youhong Tang
Using recycled concrete aggregates (RCAs) in concrete is a promising approach to minimise the environmental impacts associated with construction and demolition waste while simultaneously enhancing the sustainability of concrete. Improving the quality of RCAs is crucial for promoting confidence among materials suppliers and systematic utilisation of RCAs in construction. Pristine graphene (PG) suspensions
-
Mechanical and thermal behaviour of concrete with waste rubber and glass powder as fine aggregate and cement substitutes Mag. Concr. Res. (IF 2.7) Pub Date : 2024-03-01 Reza Saghafi Lasemi, Masoud Ziaei, Mohammad Hadi Alizadeh Elizei, Reza Esmaeil Abadi
One way of recycling waste materials such as tyres and glass is to use them in concrete. The effects of the simultaneous use of waste rubber particles (RPs) as a partial substitute for fine aggregate and glass powder (GP) as a partial substitute for cement on the workability and mechanical properties of concrete at ambient temperature and after exposure to high temperature (600°C) were investigated
-
Dynamic uniaxial compression mechanical properties of self-compacting rubber concrete subjected to different strain rates Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-29 Xiao-Jun Ke, Zheng-Ren Chen, Chun-Ying Ye, Wan-Nian Xiang
Rubber concrete is a kind of light green building material, which is prepared by mixing rubber powder or rubber crumb into ordinary concrete in a certain proportion and then introducing rubber concrete through vibration-free technology to prepare self-compacting rubber concrete. Uniaxial compression tests were carried out on self-compacting rubber concrete with two particle sizes at different strain
-
A novel development of ultra-high-performance concrete with calcium oxide-activated materials and fibers: engineering properties and sustainability evaluation Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-24 Hadi Bahmani, Davood Mostofinejad
This study developed a novel ultra-high-performance concrete using calcium oxide-activated materials (UHPC-CAM) and modified synthetic macro and glass fibers. The mechanical and durability properties of the UHPC-CAM samples with different fiber types were tested and compared. The microstructure of the samples was examined by scanning electron microscopy (SEM). The environmental impacts of the mix designs
-
Effect of sand gradations on the fresh properties of 3D printable concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-24 Senthil Kumar Kaliyavaradhan, P. S. Ambily, Deepadharshan Shekar, Shilpa Sebastian
Sand is frequently used as a fine aggregate in concrete mixtures, however, the performance of concrete can be considerably impacted by regional variations in sand gradation. This study systematically investigated the effect of sand gradations on fresh properties of 3D printable concrete (3DPC) mixtures. The binder combinations, including cement, fly ash, silica fume, limestone powder, ground granulated
-
Durability of marine concrete with nanoparticles under coupled action of fatigue load, dry–wet cycles and Cl− corrosion Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-23 Maohua Zhang, Zhiyi Li, Lin Du, Zenong Tian, Dazhi Liu
The combination of multiple factors in marine environments can accelerate the concrete corrosion. In this work, bending fatigue load, dry–wet cycles and Cl− erosion were experimentally combined to evaluate the endurance of marine concrete incorporating nanoparticles (nano-silica (NS) and nano-titania (NT)). Dry–wet cycles of the nano-concretes were simulated in seawater (5% sodium chloride solution)
-
Experimental and machine learning based study of compressive strength of geopolymer concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-23 Ngoc Thanh Tran, Duy Hung Nguyen, Quang Thanh Tran, Huy Viet Le, Duy-Liem Nguyen
In this study, the aim is to investigate and predict the compressive strength of geopolymer concrete (GPC). The effects of curing method, curing time and concrete age on the compressive strength of GPC were evaluated experimentally. Four curing methods, namely room temperature (25°C), mobile dryer (50°C), heating cabinet type 1 (80°C) and heating cabinet type 2 (100°C) were adopted. Additionally, three
-
Enhancing strength of cement using aluminium sulfate accelerator with aluminium formate Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-23 Wan Zhang, Zhihong Wu, Wang Huang, Jiawei Wang, Yuexin Pan, Zhishun Li, Shufang Ren, Hongjin Xu
An alkali-free liquid accelerator was prepared with aluminium sulfate and aluminium formate as the main components. The effects of the accelerator on the setting of paste and the mechanical strength of mortar were studied, and the impact of the accelerator on the early hydration behaviour and hydration products of the paste were investigated by isothermal calorimeter analysis, X-ray diffraction analysis
-
A review of fracture propagation in concrete: fundamentals, experimental techniques, modelling and applications Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-23 Salim Barbhuiya, Bibhuti Bhusan Das, Fragkoulis Kanavaris
A comprehensive overview of fracture propagation in concrete, covering various aspects ranging from fundamentals to applications and future directions, is presented. The introduction presents an overview of fracture propagation in concrete, emphasising its importance in understanding the behaviour of concrete structures. The fundamentals of fracture propagation are then explored, including concrete
-
Effect of expansive agent on the mechanical properties of carbon-fibre-reinforced cement-based composites Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-23 Jinghui Dai, Jun Wang, Huigang Xiao
Improving the flexural strength of a cement-based composite (CBC) reinforced with chopped carbon fibre (CF) while maintaining good workability is highly attractive for building high-rise large-span structures. A sulfoaluminate-based expansive agent (EA) was used to optimise the mechanical properties of CBCs reinforced with chopped CF by improving the fibre–matrix interfacial properties. The results
-
Experimental study on static and impact properties of concrete incorporating different nanoparticles in single and combined forms Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-19 Mohammed Gamal Al-Hagri, Mahmud Sami Döndüren
A comparative evaluation of the single and combined effect of nanoparticles (NPs) on the static and impact properties of concrete is presented. Different NPs (silicon dioxide, aluminium oxide and ferric oxide) were used separately and in combination as partial replacements of cement at 0.5% and 1% by weight of cement. The effects of the NP additions on the unit weight, compressive strength, split tensile
-
Experimental study on compressive strength of in situ concrete tested with arc pressure method Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-19 Suhang Yang, Chen Hu, Zhifeng Xu
The innovative arc pressure testing method (APTM) is adopted in this study to obtain the strength of in situ concrete and reduce damage to the concrete structure. This method is related to the double shear plane of the concrete core. A specific APTM apparatus is used to apply loads in order to obtain the approximate pure shear stress and shear strength of the concrete core. Factors affecting the strength
-
New method for determining the mode I fracture toughness of shotcrete: edge-notched partial disc test Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-19 Mohammad Omidi Manesh, Vahab Sarfarazi, Nima Babanouri, Amir Rezaei, Arsham Moayedi Far
The fracture toughness (mode I) of shotcrete specimens was obtained using edge-notched partial disc (ENPD) specimens. Notched Brazilian discs (NBDs) were also tested to validate the results of the ENPD experiments. Numerical analysis was also conducted on the ENPD results to compare the measured and numerically obtained fracture toughness values. The notch lengths in the ENPD specimens were 15, 30
-
Mechanical properties of mortars with waste plastic as replacement of natural aggregate Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-19 Luca Lavagna, Daniel Suarez-Riera, Nicoletta Mangani, Matteo Pavese
The use of waste plastic from waste electrical and electronic equipment as a substitute for natural aggregates in cementitious materials is an increasingly relevant issue. If proved to be suitable, this would allow the recycling of plastics destined for landfill and decrease the use of new natural resources. However, replacing sand with plastic tends to reduce the mechanical properties of mortars due
-
Improvement on engineering properties of alkali activated ternary cementitious paste with calcined oyster shell ash and flue gas desulfurization gypsum Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-17 Stella Patricia Angdiarto, Chun-Tao Chen, Ta-Peng Chang, Jeng-Ywan Shih
To reduce the environmental pollution and conserve the natural resources, this study utilized the calcined oyster shell ash (COSA), Class F fly ash (FFA), and flue gas desulphurization (FGD) gypsum to improve the engineering properties of alkali-activated ternary cementitious paste. The COSA was obtained by calcining the crushed oyster shell at 800°C for three hours and then ground to pass through
-
Effect of external sulfate attack on the tensile properties of fiber-reinforced sprayed concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-17 Renan P. Salvador, Ramoel Serafini, Dimas A. S. Rambo, Alessandra S. Sant'Anna, Valdecir A. Quarcioni, Antonio D. Figueiredo
This paper presents an investigation on the effect of external sulfate attack (ESA) on the mechanical and microstructural properties of steel fiber-reinforced sprayed concrete (SFRSC). Crimped carbon steel fibers, 40 mm-long, were used as reinforcement in three different mixtures with specified fiber contents of 30 kg/m³, 60 kg/m³ and 90 kg/m³. Cylindrical specimens, drilled from SFRSC panels, were
-
Abrasion resistance of milling steel fibre-reinforced ultrahigh-performance concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-17 Hengchang Wang, Baixi Chen, Yibo Yang, Yinggan Xia, Qifeng Xiao, Shaokun Liu, Wenying Guo
Ultrahigh-performance concrete (UHPC) is susceptible to various forms of abrasion during its service life. This study is an investigation of the abrasion resistance of UHPC, focusing on two primary causes of wear: dynamic traffic loads and hydraulic impacts. To enhance the material's resistance to abrasion, milling steel fibres were utilised. For comparative purposes, straight steel fibres and hybrid
-
Post-fire properties of lightweight 3D printed concrete containing expanded perlite Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-13 Zahir Azimi, Moein Mousavi, Habib Akbarzadeh Bengar, Akbar A. Javadi
There has been an increase in construction with three-dimensional (3D) printing technology but 3D printed (3DP) structures also require weight reduction similar to conventional reinforced concrete structures. In addition, the behaviour of this type of structure against fire needs to be investigated. The number of printed layers and the time gap between layers for the 3DP specimens were among the variables
-
Mixing approach for 3D printable concrete: method of optimisation of superplasticiser dosage Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-13 Parukutty Sanker Ambily, Senthil Kumar Kaliyavaradhan, Shilpa Sebastian, Deepadharshan Shekar
This study is a systematic investigation of superplasticiser (SP) addition methods and optimum SP dosage with various water-to-binder ratios (w/b) for mixing three-dimensional printable concrete. In this study, five distinct strategies were adopted to arrive at the optimum method of addition. In the first strategy, a random mixing approach was applied to identify, through visual observation, methods
-
Time–depth dependent chloride diffusion coefficient of self-compacting concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-13 Dongyun Liu, Chao Wang, Tong Guo, Jaime Gonzalez-Libreros, Yuanfei Ge, Yongming Tu, Lennart Elfgren, Gabriel Sas
Chloride attack severely impacts the performance of reinforced concrete. The total and free chloride ion concentration (CIC) of self-compacting concrete (SCC) prepared with three supplementary cementitious materials (SCM) – fly ash (FA), blast furnace slag (BS) and silica fume (SF) – were measured by accelerated salt immersion tests. The apparent chloride diffusion coefficient (CDC) at any exposure
-
Damage constitutive model of polypropylene-fibre-reinforced recycled aggregate concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-13 Yu Yu, Xin Yang, Yu Tang
Adding polypropylene fibre (PPF) to recycled aggregate concrete (RAC) not only improves performance but also has economic benefits. The effects of single-blend and double-blend micro- and macro-PPFs in RAC specimens were studied. Micro- and macro-PPFs were used to design and produce 30 groups of PPF-reinforced RAC specimens with 0%, 25% and 50% coarse aggregate (CA) substitution rates. Controlling
-
Durability properties of lightweight concrete with ceramic mould casting waste Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-13 Zhiyou Jia, José Aguiar, Sandra Cunha, Carlos Jesus, Fernando Castro
As economies and industrialisation have grown, the foundry industry has produced a significant amount of ceramic mould casting waste (CMCW). To promote resource utilisation, this study investigates recycling CMCW as a partial replacement for lightweight aggregates in lightweight concrete. The durability of lightweight concrete mixes with varying CMCW content was studied using surface electrical tests
-
Increasing service life of concrete in sewage treatment plants using silica fume and natural zeolite Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-13 Ali Dousti, Negar Saraei, Mohammad Shekarchi, Mohammad Nikookar
Microbial attacks rapidly degrade concrete structures in wastewater facilities, leading to brief service lifespans. Hence, producing concrete resistant to chemical and sulfuric acid corrosion is more cost-effective. In the present study, a total of six concrete mixtures incorporating 7.5% silica fumes (SF) and 10% natural zeolite (ZE) were immersed in 0.5% and 1% sulfuric acid solutions with a maximum
-
Shear thickening of cementitious suspensions: effect of high-volume fraction and hydration Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-08 PVP Moorthi, Prakash Nanthagopalan
The lubrication layer (LL) formed at the concrete–pipe interface plays a crucial role in facilitating concrete pumping. Shear thickening in this layer significantly affects concrete pumping. However, very few studies are available for understanding the onset and intensity of shear thickening of the LL. In this study, the effect of solid volume fraction (SVF), superplasticiser dosage, supplementary
-
Effects of hybrid metallic wastes on strength and durability of cementitious mortars Mag. Concr. Res. (IF 2.7) Pub Date : 2024-02-07 Musa Yıldırım, Hacer Bilir Özhan
The amount of industrial waste is increasing along with the rise in industrial production. Therefore, reusing or recycling this harmful waste is quite a significant issue for waste management. A suitable use for industrial wastes is to incorporate them in concrete, the most widely used material in the world. In this study, grinding swarf, which had not been used in cementitious composites before, and
-
Tensile characteristics of ultra-high performance fiber reinforced concrete with and without longitudinal steel rebars Mag. Concr. Res. (IF 2.7) Pub Date : 2024-01-23 Chandrashekhar Lakavath, S. Suriya Prakash, Srinivas Allena
This study presents an experimental evaluation of ultra-high-performance fiber-reinforced concrete specimens with and without longitudinal reinforcement under direct tensile loading. The study variables are (i) volume fraction of fibers (1.0% and 2.0%), (ii) type of steel fibers (straight and hooked end), and (iii) longitudinal steel reinforcement ratio of 0.0% and 1.2%. All the specimens are tested
-
Optimised performance of ultrahigh-performance silicomanganese slag concrete by water glass immersion Mag. Concr. Res. (IF 2.7) Pub Date : 2023-12-22 Baifu Luo, Dong Wang, Mohamed Elchalakani
Silicomanganese slag (SS) is a byproduct of the ferroalloy industry. It causes environmental pollution and consume resources. In this study, water glass immersion was used to improve the performance of SS, which was utilised in the production of ultrahigh-performance concrete (UHPC). The results show that SS treated with a 2% water glass concentration for 24 h had 16 MPa higher compressive strength
-
Numerical simulation and design of circular steel-reinforced concrete-filled steel tubular short columns under axial loading Mag. Concr. Res. (IF 2.7) Pub Date : 2023-12-20 Mizan Ahmed, Saad A. Yehia, Ramy I. Shahin, Mohamed Emara, Vipulkumar Ishvarbhai Patel, Qing Quan Liang
This paper presents a computational model for determining the axial responses of circular Steel-Reinforced Concrete-Filled Steel Tubular (SRCFST) short columns. A novel confinement model is formulated for the concrete-core that is effectively confined by the external circular steel tube and the embedded steel section. The modeling scheme of confinement is programmed in the mathematical model that utilizes
-
Load-bearing capacity of precast high-strength self-compacting recycled aggregate concrete column-to-column connections Mag. Concr. Res. (IF 2.7) Pub Date : 2023-11-27 Xiaoguang Chen, Zeger Sierens, Jiabin Li
Recycled aggregate concrete (RAC) often shows different strength and deformation properties to natural aggregate concrete (NAC) and may therefore have an impact on the connections between precast concrete elements. In this work, three simple connections between precast concrete columns were considered, including a wet connection with bedding mortar, a dry connection without bedding mortar and a monolithic
-
Impact of recycled concrete aggregates on the strength and durability properties of pervious concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2023-11-22 Mudasir Nazeer, Kanish Kapoor, Surinder Pal Singh
An investigation was designed to assess the performance of pervious concrete prepared with fly ash (FA) and recycled concrete aggregates (RCA) in place of Portland cement (PC) and natural aggregates (NA). The percentage of NA replacement with RCA was varied (0%, 50% and 100%), while the percentage of FA substitution was fixed at 10%. Various fresh (workability and consistency), mechanical (compressive
-
Impact of supplementary cementitious materials and fibers in ECC on the fire resistance of hot-jointed SCC/ECC composites Mag. Concr. Res. (IF 2.7) Pub Date : 2023-11-21 Waqas Latif Baloch, Hocine Siad, Mohamed Lachemi, Mustafa Sahmaran
This research examines the influence of various supplementary cementitious materials (SCMs) and fibers on the fire resistance of composite systems (CS) that combine engineered cementitious composites (ECC) in tension with self-compacting concrete (SCC) in compression. The study was designed to determine the ECC formulation ideally suitable for optimizing mechanical properties and bonding performance
-
Thermal conductivity and electrical resistance of carbon-based cementitious composites Mag. Concr. Res. (IF 2.7) Pub Date : 2023-11-20 Fatih Acikök, Ahmet Genç, Oğuzhan Şahin, İsmail Raci Bayer, Mehmet Kemal Ardoğa, Mustafa Şahmaran
The aim in this study was to produce multifunctional cementitious composites with advanced thermal and electrical performance, considering that these composites have high conductivity and can be used in, for example, deicing, electromagnetic shielding, antistatic or anticorrosion applications. Carbon fibre (CF) and carbon powder (CP) were used singly or together to develop cementitious composites with
-
Thermal and mechanical properties of a sustainable bio-flax fiber based light-weight aggregate concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2023-11-20 M. Chellapandian, J. Maheswaran, N. Arunachelam
A novel lightweight aggregate concrete (LWAC) or lightweight concrete (LWC) is developed using the expanded perlite powder (EPP) and light-weight expanded clay aggregate (LECA) as a replacement for conventional fine and coarse aggregates respectively. Furthermore, the natural plant-based flax fiber in treated form was added to the LWC mix at three different volume fractions. The mechanical and thermal
-
Effects of desalinated sea sand on the alkali-silica reaction of seawater and sea sand concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2023-11-11 Dehui Wang, Qingnan Gong, Surong Luo, Zhengxian Yang
The application of seawater and sea sand concrete (SWSSC) can reduce the construction period and cost of island infrastructure, but it may also bring the risk of alkali-silica reaction (ASR) due to the presence of alkali ions in seawater and sea sand. To compare the characteristics of ASR between SWSSC and seawater and desalinated sea sand (DSS) concrete and investigate the effects of desalinated sea
-
Meso-damage behavior of cement stabilized macadam for a long-time immersion based on particle flow theory Mag. Concr. Res. (IF 2.7) Pub Date : 2023-11-10 Guofang Zhao, Chengcheng Luo, Xiaoyong Wu, Xinqiang Wang, Yongkang Yan, Zhanyou Yan
Water can cause a certain degree of damage to cement stabilized macadam. If cement stabilized macadam is immersed in water for a long time, the degree of damage will be greater. In order to study the damage of cement stabilized macadam with long-time water immersion, a discrete element model of cement stabilized macadam was established in this paper. The Weibull distribution function was used to simulate
-
Effects of mixture design parameters on the properties of belitic calcium sulfoaluminate concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2023-11-08 Israel Aguilar Rosero, Edgar Soriano Somarriba, Behzad Farivar, Cameron D Murray
Belitic calcium sulfoaluminate (BCSA) cement has well-established advantages such as a fast setting time, fast strength gain, long-term strength, shrinkage and sustainability. BCSA cement reaches an initial set in about 15 min at room temperature and can reach compressive strengths of over 27 MPa in about 2 h. While it can be mixed in a similar fashion to Portland cement (PC), a set retarder (such
-
Simplified numerical model for the collapse analysis of RC frame under oblique impact Mag. Concr. Res. (IF 2.7) Pub Date : 2023-11-08 Yujing Zhou, Xiaowei Cheng, Yi Li, Fangfang Liu
The objective of this study is to develop a simplified numerical model that can be used to accurately and quickly conduct collapse analysis of a reinforced concrete (RC) frame impacted by a vehicle obliquely at 45°. The simplified numerical model included introduces a simplified RC frame and a simplified vehicle. For the simplified RC frame, a mixed modelling technique was used, in which structural
-
Hybrid effect of polyethylene fibre and nano-calcium carbonate on the flowability and strength of a geopolymer composite Mag. Concr. Res. (IF 2.7) Pub Date : 2023-11-02 Hui Li, Li Li, Ning Zhang, Qi Feng
Using geopolymer composites to reduce the use of Portland cement can decrease carbon dioxide emissions. The focus of this study was on improving the strength of a geopolymer composite by assessing the positive hybrid effect of nano-calcium carbonate (NCC) and polyethylene fibres (PFs) of different lengths (6 mm and 12 mm). Fresh and hardened properties, including flowability and strength, were investigated
-
Alkali activation of fly ash in self-consolidating concrete at low molar concentration Mag. Concr. Res. (IF 2.7) Pub Date : 2023-10-23 Muthu Kumar Palanisamy, Arun Murugesan, Abdul Aleem Mohamed Ismail, Deepasree Srinivasan
As a means of minimising the negative effects on the environment, the use of industrial byproducts in the building industry is becoming more popular. Recently, alkali activation of precursors has boomed in the market since activation of precursors improves mechanical properties and reduces the carbon footprint. However, one risk factor in alkali activation is molar concentration. This is because the
-
Effects of mixture design parameters on the properties of belitic calcium sulfoaluminate concrete Mag. Concr. Res. (IF 2.7) Pub Date : 2023-10-16 I. Aguilar Rosero, E.O. Soriano Somarriba, B. Farivar, C.D. Murray
Belitic calcium sulfoaluminate (BCSA) cement has well established advantages related to fast setting time, fast strength gain, long-term strengths, shrinkage, and sustainability. BCSA cement reaches initial set in about 15 minutes at room temperature and can reach compressive strengths of over 27 MPa (3.9 ksi) in about 2 hours. While it can be mixed in a similar fashion to portland cement, a set retarder