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Influencing factors and optimization on mechanical performance of solid waste-derived rapid repair mortar

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Abstract

There is a great demand for high performance rapid repair mortar (RRM) because of the wide use of cement concrete. Solid-waste-based sulfoaluminate cement (WSAC) is very suitable as a green cementitious material for repair materials because of its characteristics of high early-age strength and short setting time. However, the influence and optimization of various factors of WSAC-based RRM, such as water-to-RRM ratio, binder-to-sand ratio and additives, as well as the further solid waste replacement of aggregate, remain to be studied. This paper comprehensively studied the influence of the above factors on the performance of WSAC-based RRM and obtained a green high-performance RRM by optimizing these factors. The experimental results showed that the early and late strength of the obtained RRM is excellent, and the setting time and fluidity are appropriate, which reflected good mechanical properties and construction performance. Ordinary Portland cement (OPC) doping could not improve RRM strength. It was feasible to prepare RRM with gold tailing sand replacing part of the quartz sand. This paper provides data and a theoretical basis for the preparation of high-performance RRM based on solid waste, expanding the high value utilization of solid waste, which is conducive to the development of a low carbon society.

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Funding

National Key R&D Program of China (No. 2020YFC1910000) and the Shandong Natural Science Foundation Youth Project (No. ZR2020QE201).

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Authors and Affiliations

  1. The National Engineering Laboratory of Coal-Fired Pollutants Emission Reduction, Shandong University, 17923 Jingshi Road, Jinan, Shandong, China

    Jingwei Li, Xiangshan Hou, Aiguang Jia, Xin Xiao, Xujiang Wang, Yonggang Yao, Ziliang Zhang & Wenlong Wang

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  1. Jingwei Li
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  4. Xin Xiao
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Correspondence to Jingwei Li.

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No conflict of interest exists in the submission of this manuscript, and the manuscript has been approved by all authors for publication. I would like to declare on behalf of my co-authors that the work described is original research that has not been published previously, and is not under consideration for publication elsewhere, in whole or in part. All the authors listed have approved the manuscript that is enclosed.

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Appendix A of the Chinese standard GB 50119-2013

Appendix A of the Chinese standard GB 50119-2013

Test method for adaptability of concrete admixtures to cement

  1. A.0.1

    This detection method is suitable for testing the adaptability of all kinds of concrete water reducing agents and various admixtures combined with water reducing agents to cement, and can also be used for testing its adaptability to mineral admixtures.

  2. A.0.2

    The instruments and equipment used for testing shall comply with the following provisions:

    1. 1.

      Cement mixer;

    2. 2.

      Truncated conical die: a metal product with a smooth, seamless interior. Its upper and lower inner diameters are 36 mm and 60 mm, respectively, and its height is 60 mm;

    3. 3.

      Glass pane: 400 mm×400 mm×5 mm;

    4. 4.

      Straight steel ruler: 300 mm;

    5. 5.

      Scraping knife;

    6. 6.

      Stopwatch, Clock;

    7. 7.

      Pharmacist balance: the range is 100 g; the perceptibility is 1 g;

    8. 8.

      Electronic balance: the range is 50 g; the perceptibility is 0.05 g.

  3. A.0.3

    The test method of cement suitability is carried out in the following steps:

    1. 1.

      Place the glass pane in a horizontal position. Wipe the glass pane, truncated conical die, cement mixer and stirring pot evenly with a wet cloth, so that the surface is wet without water droplets;

    2. 2.

      Place the truncated conical die in the center of the glass pane and cover it with a wet cloth;

    3. 3.

      Weigh 600 g cement and pour it into the mixing pot;

    4. 4.

      When selecting admixtures for certain cement, different amounts of each admixture should be added, respectively; when selecting a cement for a certain admixture, different amounts of admixture should be added to each cement. For different kinds of admixtures, different amounts should be tested separately;

    5. 5.

      Add 174 g or 210 g water (when the admixture is liquid, the water content should be deducted), stir for 4 min;

    6. 6.

      The mixed paste is quickly injected into the truncated conical die, and then scraped flat with a scraping knife. Lift the truncated conical die vertically and start the stopwatch. At 30 s, the average value of the maximum diameters of the two perpendicular directions of the flowing cement paste was taken as the initial fluidity of the cement paste. The cement paste is no longer poured back into the mixing pot;

    7. 7.

      The cement paste that has been measured for fluidity should be discarded and not put into the mixing pot. When the cement paste is parked, the mixing pot should be covered with a wet cloth;

    8. 8.

      For the cement paste remaining in the mixing pot, turn on the mixer and stir for 4 min after adding water for 30 min and 60 min. Then measure the fluidity of cement paste at the corresponding time according to method A.0.3-6 of this specification.

  1. A.0.4

    The test results shall be analyzed as follows:

    1. 1.

      Draw a curve with the content as the abscissa and the fluidity as the ordinate. The admixture with low content, high fluidity and low fluidity loss at saturation point (the inflection point of the curve between the admixture content and the fluidity of cement paste) has good adaptability to cement.

    2. 2.

      The type, grade and manufacturer of the admixture and cement should be indicated; Laboratory temperature, relative humidity, etc., need to be noted. If the water-to-cement ratio (water-to-binder ratio) does not conform to this regulation, it should also be indicated.

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Li, J., Hou, X., Jia, A. et al. Influencing factors and optimization on mechanical performance of solid waste-derived rapid repair mortar. Waste Dispos. Sustain. Energy 5, 223–234 (2023). https://doi.org/10.1007/s42768-022-00133-z

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