磨细高炉矿渣
材料科学
固化(化学)
水泥
抗压强度
复合材料
氢氧化钙
氢氧化物
化学工程
工程类
作者
Claudia C. Castellano,Viviana L. Bonavetti,Horacio A. Donza,Edgardo F. Irassar
标识
DOI:10.1016/j.conbuildmat.2015.11.001
摘要
The combined effect of water to binder ratio and the curing temperature on the progress of the hydration and the crossover effect on blastfurnace cements containing 40% (BFS40) and 80% (BFS80) of GGBFS was investigated. Tests were performed on pastes with w/b of 0.3–0.5 exposed to 20, 40 and 60 °C up to 365 days. The hydration progress was monitored by the amount of non-evaporable water and the calcium hydroxide by XRD. A quadratic response-surface model was used to model the crossover effect. Blastfurnace cements present high apparent activation energy (Ea), which is proportional to the GGBFS content in cement, causing a high sensibility to temperature. The non-evaporable water of blastfurnace cements increases with the w/b ratio, temperature and age. The high temperature increasing the early compressive strength and therefore the crossover effect appears after 7 days for PC, 28 days for BFS40 and it is not detected until 365 days for BFS80. The w/b ratio has little or no effect on this phenomenon. To improve the strength of blast-furnace cements, the w/b ratio and the curing temperature will be properly designed according the proportion of slag in cement.
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