砂率对再生混凝土强度及干燥收缩性能影响  

Effect of Sand Percentages on Strength and Drying Shrinkage of Recycled Concrete

作　　者：崔正龙[1] 吴翔宇[1] 童华彬[1] 

机构地区：[1]辽宁工程技术大学建筑工程学院,阜新123000

出　　处：《硅酸盐通报》2014年第11期3054-3057,3062,共5页Bulletin of the Chinese Ceramic Society

基　　金：辽宁省"十百千高端人才引进工程"资助项目(50GD02)

摘　　要：试验以不同砂率为变量,研究了100%再生粗骨料取代率C30再生混凝土的强度及干燥收缩性能,并与普通混凝土试件进行对比。试验结果表明,在相同配比条件下随着砂率的增加,新拌混凝土坍落度值有所降低,含气量有所加大,100%再生粗骨料混凝土与普通混凝土的抗压强度趋于平稳,变化不大;100%再生粗骨料混凝土与普通混凝土对比强度略有降低;在相同配比条件下随着砂率的增加,100%再生粗骨料混凝土与普通混凝土的干燥收缩长度变化率都略有增加,120 d后趋于平稳,180 d混凝土的干燥收缩长度变化率与砂率呈良好的线性关系。The tests used different sand percentages as variables,and studied the strength and dry shrinkage of both C30 recycled concrete and comparative ordinary concrete,when the replacement rate of recycled coarse aggregate is 100%. The results indicated that,under the same mixing proportion of C30,the slump of fresh concrete reduced a bit,the air content increased as sand percentage increasing; when sand percentage increased,the strengths of complete recycled concrete and ordinary concrete leveled off with little change; strengths of complete recycled concrete were a little lower than those of ordinary concrete; under the same mixing proportion,the length change rates of drying shrinkage of both complete recycled concrete and ordinary concrete had a slight increase with the increase of sand percentage,leveled off after 120 d,the length change rates of drying shrinkage and sand percentages had a good linear relationship after 180 d.

关 键 词：再生混凝土 抗压强度 砂率 干燥收缩 

分 类 号：TU528[建筑科学—建筑技术科学]