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为了解决环境污染与资源紧张的问题,利用建筑垃圾中的废弃混凝土制备再生粗骨料和再生细骨料,分别按照不同的取代率替代天然骨料以双掺的形式制备再生混凝土。研究结果表明,双掺再生骨料混凝土的工作性及力学性能要差于天然骨料混凝土;随着再生细骨料和再生粗骨料取代率的增大,其用水量显著增多,各个龄期的抗压强度逐渐降低,但这两种性能均呈现出较好的线性关系;当双掺再生骨料的取代率均达到100%时,相比天然骨料混凝土,其用水量增多22.1%,抗压强度降低19.2MPa,线性相关系数均在0.942以上;再生混凝土应用时,双掺再生骨料的取代率均不宜大于50%。
In order to solve the problem of environmental pollution and resource shortage, the recycled concrete in the construction waste was used to prepare recycled coarse aggregate and recycled fine aggregate, and the recycled aggregate concrete was prepared in the form of double admixture by replacing the natural aggregate with different substitution rates respectively. The results show that the workability and mechanical properties of double-mixed recycled aggregate concrete are worse than those of natural aggregate concrete. With the increase of replacement rate of recycled fine aggregate and recycled coarse aggregate, The compressive strength of the aggregate decreases gradually, but the two properties show a good linear relationship. When the replacement rate of the double-mixed recycled aggregate reaches 100%, the water consumption increases by 22.1% compared with the natural aggregate concrete, The compressive strength decreased by 19.2MPa and the linear correlation coefficients were all above 0.942. When the recycled concrete was used, the replacement rate of recycled aggregate should not exceed 50%.