The grasp of the tensile creep behavior of the high strength/high performance concrete(HSC/HPC) is very important to analyse stress accurately and predict cracking. In this paper, the influences of loading ages and stress strength ratio on the behavior of tensile creep of HSC/HPC containing blast furnace slag were investigated systematically by improving the existing experimental apparatus for determination the tensile basic creep of concrete at early ages, and the behavior of tensile basic creep was evaluated by using the existing tensile creep prediction model at early ages.The main conclusions derived from the investigation are as follows:(1) The improved experimental apparatus for determination the tensile basic creep of concrete can effectively evaluate the tensile creep behavior of HSC/HPC containing blast furnace slag at early ages under various parameters(stress strength ratio, loading age).(2) The relationship between the tensile strength and compressive strength of concrete was fts=0.12fc0.96; the ratio between the tensile elastic modulus and elastic modulus of concrete was about 1.09.(3) The autogenous shrinkage increased, but the development rate decreased with the ages of concrete; the autogenous shrinkage developed very quickly within the age of 3 days, especially within 1day, and then it slowed down gradually.(4) The creep developed very quickly within the age of 1 day, and the creep rate decreased dramatically after a short initial time under loading; the specific creep was very different between all loading ages, which showed that the tensile creep is very sensitive to the loading ages.(5) Tensile creep was not proportional to applied stress when the loading age was 1 day, and the higher initial stress strength ratio, the larger specific creep; however, it appeared characteristic of linearity when concrete was loaded at 3, 5 and 7 days, and the tensile specific creep was similar between both stress strength ratios..(6) Comparing with the reference concrete under the same loading age and loading stress strength ratio, it was found that the blast furnace slag significantly increased the tensile creep of concrete within 3 days, while there was a certain inhibitory effect on the tensile creep of concrete after 7 days loading age.(7) The prediction of the ZC model based on the data of this experiment nearly applied to the tensile creep of HSC/HPC containing blast furnace slag at early ages, and the confidence interval was about±40%. |