利用建筑垃圾生产混凝土的性能研究

Performance of recycled concrete from construction waste

通过对再生骨料基本性能的研究,根据再生骨料的特殊物理性能,设计研究了不同级配下的再生骨料混凝土的工作性能和抗压强度。当细骨料采用天然砂,级配合理时,再生混凝土28d抗压强度可以达到44MPa,工作性能良好;当粗细骨料都采用再生骨料,再生骨料的粒径分布为0～5mm约占60%～70%,5～10mm约占30%～40%时,可以满足配制强度为15MPa再生混凝土的要求,粗、细骨料的重量比达到50%以上时再生混凝土的工作性比较好、强度可以达到12.4～14.9MPa。

The fundamental characteristics of recycled aggregate are investigated firstly.Furthermore,based on the special physical properties of recycled aggregate, the work performance and compressive strength of recycled aggregate concrete are studied.The results show that, when the fine sand is used as the fine aggregate and the gradation is reasonable ,the 28 days compressive strength of recycled aggregate concrete may be as high as 44 MPa and the work performance of recycled aggregate concrete is also fairly well;when the recycled aggregate is used as the coarse and fine aggregate, and the particle size distribution of the recycled aggregate is as follows： 0-5 mm （approximately 60%-70% ）, 5-10 mm（ approximately 30%-40% ）, the compressive strength of recycled aggregate concrete can meet the requirement on the strength of 15 MPa; when the weight ratio of the coarse and fine aggregate is more than 50% ,the work performance of recycled aggregate concrete is reasonably well and the compressive strength of recycled concrete may be between 12.4 MPa and 14.9 MPa.