Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 25, Issue 10, Pages 3998-4005Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2011.04.034
Keywords
Cementitious materials; Microstructure formation; Ultrasonic monitoring; Percolation; Connectivity
Categories
Funding
- 973 Program [2009CB623200]
- Program for New Century Excellent Talents in University [NCET-08-0116]
- Postgraduates Research Innovation in University of Jiangsu Province [CX10B-064Z]
- Excellent Doctoral Dissertation Foundation of Southeast University
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The early age microstructure evolution was continuously monitored by using a specially improved ultrasonic monitoring apparatus. The influence of water-to-binder ratios, mineral admixtures, aggregates and temperature were systematically investigated. The experimental results show that concrete can be clearly classified into four stages, while only the three stages can be observed without coarse aggregates. In addition, pre-percolation threshold, percolation threshold and full connectivity of the solid phase were identified. The microstructure formation is promoted with the reduced water-to-binder ratios, increased temperature, silica fume and aggregates addition, while the reverse phenomenon is observed when fly ash and slag are incorporated. (C) 2011 Elsevier Ltd. All rights reserved.
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