石粉对机制砂再生混凝土性能的影响研究

Research of the Influence of Limestone on the Performance of Recycled Concrete with Machine-made Sand

为解决废弃建筑垃圾再生利用问题,通过实验确定机制砂、石粉、再生粗骨料等材料的基本物理性质,利用正交试验,通过调整石粉掺量、机制砂及粗骨料取代率等因素,对机制砂再生混凝土进行配合比研究。经分析得到各因素对机制砂再生混凝土性能的影响重要程度依次为水胶比>石粉掺量>再生骨料替代率>机制砂替代率,提出了合理的机制砂掺量和再生混凝土取代率,以期促进能源的再生利用,保护河砂资源。

In order to recycle abandoned construction waste,basic physical performance of materials,such as machine-made sand,limestone and recycled concrete,etc,are determined through orthogonal test.Research on the mix proportion of machine-made sand and recycled concrete is done through the adjustment of the amount of admixture of limestone,and the replacement rate of machine-made sand and coarse aggregate,etc.Through analysis,the rank of the important degree of all influencing factors on the performance of recycled concrete with machine-made sand is water-binder ratio>amount of limestone admixture>substitution rate of recycled aggregate>substitution rate of machine-made sand.Rational the amount of machine-made sand mixture and the substitution rate of concrete are proposed in order to promote the recycle utilization of the energy,and protect rive sand resources.