Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 33, Issue -, Pages 32-40Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2012.01.011
Keywords
Curing temperature; Silica fume; Ultrasonic; Setting; Calorimetric
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Funding
- China National Natural Science Foundation [51138002, 51178106]
- 973 Program [2009CB623200]
- Program for New Century Excellent Talents in University [NCET-08-0116]
- Doctoral Program of Higher Education of China [20100092110029]
- Key Laboratory of Urban and Architectural Heritage Conservation, Ministry of Education, Southeast University
- Key Laboratory for Advanced Building Materials of Sichuan Province [09zxxk09]
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An ultrasonic measurement apparatus (UMA) was developed for in situ continuously monitoring the early age hydration process of cementitious material. Utilizing UMA, the influence of curing temperature and silica fume content on the setting and hardening process of the low water to binder ratio cementitious material were systematically investigated. The experimental results show that setting and hardening process of the silica fume blended cement paste at elevated temperature can be clearly identified into three stages including dormant stage, acceleration stage and deceleration stage. Besides, the increasing of curing temperature and silica fume content greatly accelerate the setting and hardening process of silica fume blended cement paste and increase the ultimate ultrasonic pulse velocity. To aid in comparing with the ultrasonic results, the isothermal calorimetric measurement, Vicat needle test and mechanical properties test were also conducted. (C) 2012 Elsevier Ltd. All rights reserved.
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