机制砂级配对C80混凝土性能影响研究  

Influence of machine-made sand grade on performance of C80 concrete

作　　者：王恒 WANG Heng(Beijing Mining Coal Engineering Co.,Ltd.,Beijing 100013,China;Institute of Mine Construction,China Coal Research Institute,Beijing 100013,China)

机构地区：[1]北京中煤矿山工程有限公司,北京100013 [2]煤炭科学研究总院建井分院,北京100013

出　　处：《煤炭工程》2021年第8期161-165,共5页Coal Engineering

基　　金：国家自然基金面上项目(51774183);北京中煤矿山工程有限公司自立科技项目(BMC-ZL-202005)。

摘　　要：为满足C80混凝土在冻结井筒井壁中应用要求,通过现场配比试验,研究了机制砂级配特征,及其对砂浆流变性能、C80混凝土坍落度、扩展度、抗压强度等参数的影响。试验结果表明,在石粉掺量5%的水洗石灰石机制砂条件下,按照细度模数为2.62配比的C80混凝土具有良好的工作性能,28d抗压强度和劈裂抗拉强度分别为83.8MPa和4.74MPa。现场取芯法检测结果表明,以此试验结果进行C80混凝土井壁配比浇筑后,高性能混凝土强度值超过设计值的1.15倍。In order to satisfy the C80 high performance concrete used in frozen shaft wall, scene matching test is used to study the grading characteristics of mechanized sand, C80 concrete slump, extension ratio and compressive strength. The experimental results show that the C80 concrete with the ratio of G3,which is matched according to the fineness modulus of 2.62,has good performance. The 28 d compressive strength and splitting tensile strength are 83.8 MPa and 4.74 MPa, respectively, under the condition of washing limestone machine-made sand with the stone powder content of 5%. According to this result, the strength of HPC measured by field coring method is 1.15 times higher than the design value after the C80 concrete sidewall proportioning pouring.

关 键 词：机制砂 级配 高性能混凝土 工作性能 冻结法 

分 类 号：TD265.3[矿业工程—矿井建设]