碎石加工尾料在流动性混凝土中的应用

The Application of Residual Processing Gravels in Flowing Concrete

本文利用碎石加工尾料生产人工砂,完全代替天然河砂配制大坍落度C30和C50混凝土,研究了混凝土拌合物的物理性能以及龄期在180 d内的力学性能。结果表明,对比相同配合比的天然河砂混凝土,尾料人工砂混凝土拌合物的坍落度略小;龄期180 d内的立方体抗压强度、轴心抗压强度和劈裂抗拉强度发展规律与天然河砂混凝土基本一致,且龄期28 d后略高于同龄期天然河砂混凝土。基于试验结果,分析了混凝土轴心抗压强度、劈裂抗拉强度与立方体抗压强度的换算关系,安全性满足相关规范的要求。

The residual processing gravels are used to produce artificial sand,which completely replaces natural river sand to prepare large slump C30 and C50 concrete.The physical properties of the concrete mixture and the mechanical properties within 180 d are studied.The results show that the slump of the tailing artificial sand concrete mixture is slightly smaller when compared with the natural river sand concrete with the same mix ratio;The development law of cubic compressive strength,axial compressive strength,and split tensile strength within 180 d of age is basically the same as that of natural river sand concrete,and the strength of this concrete after 28 d of age is slightly higher than that of natural river sand concrete of the same age.Based on the test results,the conversion relationships between the axial compressive strength,split tensile strength,and cubic compressive strength of the concrete are analyzed,and the safety of this concrete has been proven to meet the requirements of the relevant codes.