煤矸石粗集料粒径对混凝土性能的影响

Influence of Particle Size of Coal Gangue Coarse Aggregates on Concrete Properties

从混凝土架构结构模型出发,采用对比实验,研究了煤矸石粗集料粒径对混凝土坍落度、抗压强度、抗折强度、弹性模量和抗冻性的影响.研究结果表明,煤矸石粗集料对混凝土的坍落度、抗压强度、抗折强度和弹性模量影响十分显著.煤矸石粗集料的掺入降低了混凝土的坍落度和抗折强度,提高了混凝土的抗压强度和弹性模量,改善了混凝土的抗冻性.随着煤矸石粗集料粒径的增大,煤矸石混凝土的坍落度逐渐增大,抗折强度和抗冻性逐渐降低,而抗压强度和弹性模量变化并不显著.

Coal gangue coarse aggregate with the different maximum particle size are used to check slump, compressive strength, flexural strength, modulus of elasticity, and the influence on frost resistance property. The results show that, slump, compressive strength, flexural strength, and modulus of elasticity of concrete are affected by coarse aggregate significantly. Flow ability and flexural strength of concrete are decreased, but compressive strength and modulus of elasticity of concrete are increased due to coarse aggregate mixed, furthermore, coarse aggregate improved frost resistance of concrete. The maximum particle decreases the concrete flexural strength and size of coarse aggregate increases the concrete slump, frost resistance, and has little role on modulus of elasticity and compressive of concrete.