摘要
实际工程混凝土浇筑意外中断时有发生,恢复浇筑新混凝土时,中断前的老混凝土很多处于第二龄期。为提高第二龄期老混凝土与新混凝土的粘结性能,通过采用不同水灰比水泥净浆和不同掺量粉煤灰水泥浆界面剂,研究不同水泥第二龄期老混凝土与新老混凝土7 d和28 d粘结劈拉强度的变化规律。结果表明:三种水泥混凝土粘结劈拉强度均随水泥净浆界面剂水灰比的增大而减小;水泥净浆(使用水泥为普通硅酸盐水泥)界面剂对普通硅酸盐水泥的粘结效果最好,次之为矿渣硅酸盐水泥,最差为复合硅酸盐水泥。界面剂中掺加粉煤灰可在一定程度上改善第二龄期老混凝土与新混凝土的粘结性能。
The concrete pouring break happens in practical engineering,when the new concrete is poured,the old concrete is in the second stage. In order to improve bond property of the second stage old concrete- to- new. Considering different water cement ratio,cement paste with different content of fly ash interface cementing agent,the change rule of 7d and 28 d splitting strength of the second- stage- old concrete- to- new with different type of cement concrete was analyzed. The experimental results indicated that three types of cement concrete bond splitting strength decrease with water cement ratio of cement paste interface cementing agent increases; the bonding effect of cement paste（ which is used ordinary Portland cement） interface cementing agent to ordinary Portland cement is the best,the second is the slag Portland cement,the worst is the composite Portland cement.
出处
《水利与建筑工程学报》
2016年第6期102-106,238,共6页
Journal of Water Resources and Architectural Engineering
基金
河南省基本科研业务费项目
河南省水利科技攻关项目(GG201621)
关键词
新老混凝土
第二龄期
劈拉强度
水泥种类
界面剂
粉煤灰
new-to-old concrete
second stage
split strength
the type of cement
interface cementing agent
fly ash
