INFLUENCE OF DIFFERENT ADMIXTURES ON ULTRA HIGH PERFORMANCE CONCRETE UNDER DIFFERENT CURING CONDITIONS
In this work, ultra-high performance concrete (UHPC) was prepared by single-mixing and compounding of different mineral admixtures such as fly ash (FA), ground granulated blast furnace slag (GGBFS), and silica fume (SF) curing under different conditions.Differential thermal analysis (DTA), fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and other analytical methods were used to evaluate the performance of UHPC.Results indicated that the early strength of UHPC increase d with increasing curing temperature for any mineral admixtures, and the enhancement of silica fume was most obvious.Moreover, DTA results indicated that the content of Ca(OH)2 (CH) in the UHPC decreased with increasing curing temperature, which was due to SF quickly react with the hydration CH at high temperature and consume CH.Furthermore, FTIR results indicated autoclaved curing accelerated the hydration of the cement in a short period of time, producing more C-S-H, resulting in the compressive strength increased.Furthermore, SEM observation indicated that the microstructure of cement pastes became more and more dense and the porosity decreased with increasing curing temperature.
Ultra-high performance concrete silica fume curing condition hydration product hydration mechanism
Yuejun Wu Shuai GAO Yujie Feng Weijie Yan Jingya Zhou Junfeng Wang
Institute of tropical agriculture and forestry, Hainan University, China;Research center of Marine E Research center of Marine Engineering Materials, State Key Laboratory of Marine Resource Utilization College of civil Engineering and Architecture, Hainan University, China;Research center of Marine En Institute of tropical agriculture and forestry, Hainan University, China;College of civil Engineerin
国际会议
福州
英文
211-220
2018-11-07（万方平台首次上网日期，不代表论文的发表时间）