钢筋硅砂混凝土短柱轴心受压试验

Experimental Study on Reinforced Dune Sand Based Concrete Stub Columns Subject to Axial Compression

目的研究混凝土配制中添加沙漠特细砂(硅砂)后的力学性能.方法采用沙漠特细砂替代传统混凝土配比中的细骨料形成沙漠硅砂混凝土.配制C50和C80强度等级的硅砂混凝土,开展方形和圆形截面钢筋硅砂混凝土轴心受压短柱的试验研究,并采用ABAQUS有限元软件对试验结果进行数值模拟.结果添加沙漠风积沙后,配制C80强度混凝土时,浆体的塌落度和流动性明显降低,硬化后混凝土强度可以满足工程应用的要求;采用普通混凝土的材料模型进行数值分析时,计算承载力与试验承载力相比略高,荷载-位移曲线总体吻合较好.结论在沙漠地区采用沙漠硅砂替代混凝土中的细骨料,可有效解决中(粗)砂资源匮乏的问题,钢筋硅砂混凝土试件的力学性能可基本满足工程应用的要求.

In order to study the mechanical behavior of dune sand based concrete when super-fine dune sand was used in concrete mixture.The dune sand in desert area was used as the substitution of fine aggregate in the mixture of concrete,and the concrete strength of C50 and C80 were prepared.A series of tests of square and circular sectional specimens of reinforced dune sand based concrete stub columns subject to axial compression were carried out.Based on ABAQUS software,the FEA models of testing specimens were built up for simulation.The slump and workability of fresh concrete became lower after the dune sand was added to the concrete mixture,however,the strength of the dune sand based concrete could be used in general engineering.Comparison between the calculated results and the measured results shows that,the calculated bearing capacities were a little higher than the measured results,the calculated load vs.deformation curves agree well with the measured curves.The lack of resources of river sand could be well resolved with the substitution of dune sand in place of river sand,and the mechanical behavior of reinforced dune sand based concrete stub columns could match the using in concrete productions.