AUTOGENOUS SHRINKAGE OF LIGHTWEIGHT AGGREGATE CONCRETE AT EARLY AGE
The deformation of concrete specimen was monitored at 3 hours later after casting byusing the autogenous shrinkage testing device developed by ourselves. And the effect oflightweight aggregate with different degree of water saturation on early age autogenousshrinkage of lightweight aggregate concrete with different water-binder ratios wereinvestigated, and compared with that of common aggregate concrete. The results indicatesthat the autogenous shrinkage of concrete incorporated with pre-soaked lightweight aggregateis significantly lower than common concrete, and the autogenous shrinkage of lightweightaggregate concrete decrease with the increase of the water content in aggregate. The ratio ofwater to binder has a significant effect on early age autogenous shrinkage. The autogenousshrinkage of lightweight aggregate concrete with water-binder ratio of 0.6 is just about 30％of the concrete with water-binder ratio of 0.3. By monitoring the temperature evolution of theconcrete, it was found that the rise of temperature induced by the heat of hydration was asmuch as 5.1℃. And the temperature deformation due to cement hydration has a greatinfluence on the testing results of autogenous shrinkage of concrete.
lightweight aggregate concrete autogenous shrinkage water content hydration temperature rise
Shuhui Dong Yong Ge Jie Yuan Baosheng Zhang Chao Xu
School of Materials Science and Engineering,Harbin Institute of Technology,Harbin,Heilongjiang Province,China
国际会议
南京
英文
841-848
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）