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为使再生混凝土在力学和耐久性能方面更好地满足工程要求,在现有研究成果的基础上对再生混凝土配合比进行改良。设计了三水平三因素正交试验,对42个普通混凝土试件和378个再生混凝土试件进行了抗压强度、快速碳化和硫酸盐侵蚀试验。讨论再生骨料取代率、硅酸钠溶液对再生骨料的强化效应以及粉煤灰掺量3个因素对再生混凝土抗压强度、碳化性能以及抗硫酸侵蚀性能的影响。研究结果表明,合理的配合比能够改善再生混凝土的力学性能和耐久性能。
In order to make recycled concrete better meet engineering requirements in terms of mechanics and durability, the proportion of recycled concrete is improved based on the existing research results. A three-level three-factor orthogonal experiment was designed. The compressive strength, rapid carbonation and sulphate erosion of 42 ordinary concrete specimens and 378 recycled concrete specimens were tested. The effects of recycled aggregate substitution rate, reinforcing effect of sodium silicate solution on recycled aggregates and fly ash content on compressive strength, carbonization performance and anti-sulfuric acid corrosion resistance of recycled concrete were discussed. The results show that a reasonable mix can improve the mechanical properties and durability of recycled concrete.