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 pH threshold of 2 and 1, respectively, for 70 weeks. The specimens were regularly monitored for surface deterioration, mass change and crushing load change. To better understand the relationship between the pore structure of concrete mixtures and resistance to sulfuric acid, various durability tests such as rapid chloride penetration, water absorption, electrical resistivity and chloride diffusion coefficient were performed. Based on the results obtained, converting calcium hydroxide into calcium silicate hydrate gel through pozzolanic reactions and then refining the porosity of concrete with silica fumes (SF) and natural zeolite (ZE) was effective in enhancing the resistance of concrete to attack by sulfuric acid of relatively low concentration. As a result, using silica fumes (SF) and natural zeolite (ZE) is a lower-cost method for reducing corrosion rates to extend the service life of facilities, particularly in lower concentrations.

中文翻译：

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使用硅粉和天然沸石提高污水处理厂混凝土的使用寿命

微生物攻击会迅速降解废水处理设施中的混凝土结构，导致使用寿命缩短。因此，生产耐化学腐蚀和硫酸腐蚀的混凝土更具成本效益。在本研究中，总共六种混凝土混合物，其中含有 7.5% 硅粉 (SF) 和 10% 天然沸石 (ZE)，分别浸入最大 pH 阈值为 2 和 1 的 0.5% 和 1% 硫酸溶液中， 70 周。定期监测样品的表面恶化、质量变化和破碎载荷变化。为了更好地了解混凝土混合物的孔结构与耐硫酸性之间的关系，进行了各种耐久性试验，例如氯化物快速渗透、吸水率、电阻率和氯化物扩散系数。根据所得结果，通过火山灰反应将氢氧化钙转化为硅酸钙水合物凝胶，然后用硅粉（SF）和天然沸石（ZE）细化混凝土的孔隙率，可有效增强混凝土的抗硫酸侵蚀能力。浓度相对较低。因此，使用硅粉 (SF) 和天然沸石 (ZE) 是一种降低腐蚀速率、延长设施使用寿命的低成本方法，特别是在较低浓度下。