蛇纹石粗骨料对屏蔽混凝土抗水渗透性的影响  

Effect of Serpentine Coarse Aggregate on the Water Permeability Resistance of Shielding Concrete

作　　者：周铭 石建军 钟海峰 杨昭 张志恒 ZHOU Ming;SHI Jian-jun;ZHONG Hai-feng;YANG Zhao;ZHANG Zhi-heng(School of Civil Engineering,University of South China,Hengyang,Hunan,421001,China)

机构地区：[1]南华大学土木工程学院,湖南衡阳421001

出　　处：《建材技术与应用》2024年第3期42-48,共7页Research and Application of Building Materials

基　　金：湖南省科技厅重点研发计划项目(2015JC3090);湖南省自然科学基金(14JJ2083);湖南省研究生科研创新项目资助(CX20230973)。

摘　　要：为研究蛇纹石粗骨料的粒径及其预湿处理对防核辐射屏蔽混凝土抗水渗透性的影响,选取粒径为5~16 mm、5~20 mm和5~25 mm三种连续级配的蛇纹石粗骨料,分别对其进行预湿及烘干处理,再采用设计配合比制得18个立方体混凝土试件用于孔隙率试验,108个圆台试件用于抗水渗透试验,并对试验结果进行对比分析。结果表明:在相同的骨料预处理条件下,粒径为5~20 mm的蛇纹石混凝土的孔隙率和相对渗透系数相较于另外两种粒径更低,抗水渗透性能更好;对于同一粒径的蛇纹石骨料,对其进行预湿处理可以有效降低其混凝土的孔隙率及相对渗透系数,提高混凝土的整体密实度和抗水渗透性;通过数据拟合发现,蛇纹石屏蔽混凝土的相对渗透系数与孔隙率之间存在着较高的线性相关性,可以通过孔隙率来预测相对渗透系数。In order to study the effect of the particle size of serpentine coarse aggregate and its pre-wetting treatment on the water permeability of nuclear radiation shielding concrete,three continuous grades of serpentine coarse aggregate with particle size of 5~16 mm,5~20 mm and 5~25 mm were selected for pre-wetting and drying,respectively.Then,18 cubic concrete specimens were used for porosity test,and 108 round concrete specimens were used for water permeability test.The test results were compared and analyzed.The results show that under the same aggregate pretreatment condition,the porosity and relative permeability coefficient of serpentined concrete with particle size of 5~20 mm are lower than those of the other two particle sizes,and the water permeability resistance is better.For the same particle size of serpentite aggregate,the prewetting treatment can effectively reduce the porosity and relative permeability coefficient of concrete,and improve the overall compactness and water permeability resistance of concrete.Through data fitting,it is found that there is a high linear correlation between the relative permeability coefficient of serpentine-shielded concrete and the porosity,and the relative permeability coefficient can be predicted by the porosity.

关 键 词：蛇纹石骨料 骨料粒径 预湿骨料 抗水渗透性能 相对渗透系数 线性拟合 

分 类 号：TU377.2[建筑科学—结构工程]