The influence of curing temperature on hydrated products of blast furnace slag cement and its porosity at the early stage of hydration

Abstract

This research focuses on (1) the relationship between the development of compressive strength of blast furnace cement and hydrated products, hydration behavior and porosity in early stage at 5°C, 20°C and 40°C. Also, the purpose of this research is (2) to investigate the hydration behavior, compared with 20°C. As a result, in early age at 5°C, only ettringite and C4AH13 are generated without generation of monosulfate, and development of compressive strength of blast furnace cement is different from those at 20°C and 40°C. It is concluded that (1) the reaction ratio of BFS at 5°C is lower, then (2) hydration behavior and hydration products at 5°C are different from those at 20°C and 40°C, finally, (3) pore in the hardened body at 5°C cannot be filled adequately. © 2009 The Society of Materials Science, Japan.