石屑及河砂在混凝土中混合应用的研究

Research on Mixing Application of Stone Chips and River Sand in Concrete

为了推进"碳中和",缓解河砂不足的问题,合理利用石屑,通过系列研究确定河砂与石屑的最佳比例搭配,以获得满足要求的复合砂。文中分别研究了不同掺配比例的复合砂对混凝土工作性能、力学性能、抗渗性能及抗裂性能的影响,研究表明:石屑的使用对混凝土的力学性能是有利的,但超过55%的掺量后对混凝土的耐久性能会产生不利的影响。

In order to promote carbon neutrality,alleviate the lack of river sand,rational use of stone debris.Through a series of studies,the best ratio of river sand and stone debris is determined to obtain the required composite sand.The effects of different blending ratios of composite sand on the workability,mechanical properties,impermeability and crack resistance of concrete have been studied respectively.The research shows that the use of stone chips is beneficial to the mechanical properties of concrete,however,the content of more than 55% will have an adverse effect on the durability of concrete.