养护环境及置换率对再生混凝土干燥收缩裂缝的影响  

Effect of Curing Environment and the Displacement Ratio on Drying Shrinkage Crack of Recycled Concrete

作　　者：崔正龙[1] 郝敬力 陈龙[1] 兰月[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》2015年第11期3267-3270,共4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：试验以不同环境、不同再生粗骨料置换率为变量对C30再生混凝土抵抗干燥收缩裂缝性能进行了基础性试验研究,并与普通混凝土试件进行对比。试验结果表明,在相对湿度(RH60%)相同条件下,再生混凝土与普通混凝土随着干燥环境温度的提高,自由干燥收缩长度变化率逐渐加大;在相同干燥温度条件下,随着再生粗骨料置换率的增加,混凝土自由干燥收缩率也会加大;在环境相对湿度(RH60%)相同条件下,混凝土的干燥温度越高,早期干燥收缩裂缝产生的龄期就越早;在混凝土干燥温度相同条件下,再生粗骨料置换率越大,早期干燥收缩裂缝产生的龄期就越早,再生粗骨料的置换率对再生混凝土极限抗拉强度的影响有限。A basic research which different environment and different displacement ratio of recycled coarse aggregate was used to study resistance of drying shrinkage crack of C30 recycled concrete has been carried out. The specimen of C30 recycled concrete is compared with the specimen of common concrete. Results show that, under the same condition of relative humidity （ RH60% ）, with the increasing of temperature in dry environment for both, changing rate of free length with drying shrinkage gradually increase. Under the same temperature conditions of drying environment, when displacement ratio of recycled coarse aggregate increases, changing ratio of free length in drying shrinkage will increase. When relative humidity （ RH60% ） of the environment is the same. The higher drying temperature of concrete is, the earlier age of drying shrinkage crack is, when the drying temperature of concrete is the same, the higher displacement ratio of recycled coarse aggregate is, the earlier age of drying shrinkage crack, but effect of displacement ratio of recycled coarse aggregate on the ultimate tensile strength of recycled concrete will be limited.

关 键 词：再生混凝土 再生粗骨料 干燥收缩裂缝 

分 类 号：TU528[建筑科学—建筑技术科学]