硫铝酸盐水泥和普硅水泥混凝土抗裂性能研究  

Study on crack resistance of sulphoaluminate cement and ordinary Portland cement concrete

作　　者：高原 GAO Yuan(CCCC Highway Bridge National Engineering Research Centre Co.,Ltd.,Beijing 100011,China)

机构地区：[1]中交公路长大桥建设国家工程研究中心有限公司,北京100011

出　　处：《混凝土》2020年第10期25-28,共4页Concrete

基　　金：中国交建科技研发项目(2013-ZJKJ-11,2016-ZJKJ-PTSJ05);天津市交通运输科技发展计划(2019B-26)。

摘　　要：采用2种水泥(普通硅酸盐水泥和快硬硫铝酸盐水泥),设计了2个强度等级混凝土(28 d抗压强度分别在30、80 MPa左右),分别进行了自混凝土浇筑完成后开始测量的收缩试验和环约束试验。试验结果表明:相同强度等级混凝土,使用快硬硫铝酸盐水泥能够降低混凝土的收缩,尤其是干燥收缩,且混凝土强度等级越高,降低效果越明显。在环约束试验中,普通硅酸盐水泥混凝土均出现开裂,C30和C80混凝土的开裂时间分别为20、13 d,而快硬硫铝酸盐水泥混凝土在42 d龄期内均未出现开裂,抗裂性能优于同强度等级普通硅酸盐水泥混凝土。最后,结合两种水泥混凝土收缩发展的特征,对2者抗裂性能的差异进行了分析,从材料性能角度提出了改善混凝土抗裂性能的思路。Two kinds of cement(ordinary Portland cement and sulphoaluminate cement)are used to design two strength grade concrete(the compressive strength of 28 d is about 30 MPa and 80 MPa respectively).The shrinkage test and ring test,which are measured from concrete cast,are carried out respectively.The test results show that the shrinkage of concrete with the same strength grade can be reduced by using sulphoaluminate cement,especially the drying shrinkage.The higher the concrete strength,the more obvious the shrinkage reduction effect is.In the ring test,the cracking of ordinary Portland cement concrete occurs,and C30 and C80 concrete cracks at 20 days and 13 days respectively,while sulphoaluminate cement concrete has not cracked at 42 days.Cracking resistance of sulphoaluminate cement concrete is better than Portland cement concrete with the same strength grade.Finally,the difference of crack resistance between two kinds of cement concrete is analyzed combining the corresponding shrinkage development characteristics,and the idea of improving the crack resistance of concrete is put forward based on the material performance.

关 键 词：混凝土 收缩 环约束试验 普通硅酸盐水泥 硫铝酸盐水泥 

分 类 号：TU528.01[建筑科学—建筑技术科学]