Autogenous Shrinkage Of High Strength High Performance Concrete Containing Blast Slag Exposed To Different Curing Temperatures

Mineral admixture is one of the components of high strength and high performance concrete, which has a significant effect on the properties of high strength and high performance concrete. It contains blast slag, fly ash and so on.This paper focuses on analyzing and discussing autogenous shrinkage of high strength high performance concrete as well as mechanical properties of different age by setting different water-binder ratios, curing temperatures so as to provide basic reference applied to concrete for high performance concrete containing blast slag.In addition, we summarize the basic the autogenous-shrinkage testing method. Moreover, we intend to create an embedded sensor that can measure the autogenous shrinkage. Finally, we choose the non-contact measurement method.The conclusions derived from the study as follows:1、Slag admixture can improve the working performance of high strength and high performance concrete as well as prolong the setting time.2、As for high strength and high performance concrete, there exists a positive corelation between curing temperature and crushing strength under the same water-cement and the curing time; However, there exists a negative corelation between water-cement and crushing strength under the same curing temperature and the curing time.3、Slag admixture may reduce the early-age strength, but the effect of curing temperature on strength than the mineral admixture of concrete is more significant, at higher curing temperatures. When exposed to high temperature, close to the mineral admixture concrete strength and not28days28days strength of concrete with mineral powder.4、As for high strength and high performance concrete, the higher curing temperature is, the larger autogenous shrinkage strain will be under the same water-cement ratio; the lower water-cement ratio is, the larger autogenous shrinkage strain will be under the same curing temperature.5、Compared to the non-slag admixture concrete, slag admixture can apparently reduce the autogenous shrinkage of high strength and high performance concrete. Moreover, within1day it may appear a slight expansion if the temperature is low; But finally the contraction speed will catch up with non-admixture concrete, resulting a larger autogenous shrinkage.