Quantitative Evaluation on Pozzolanic Reaction of Silica Fume and the Time Dependent Development of Portlandite in Composite Cementitious Systems

Abstract:

Quantitative X-Ray Diffraction (QXRD) with Rietveld full pattern fitting method and the hyphenated technique of ThermoGravimetry (TG) with Differential Scanning Calorimetry (DSC) were used to explore the effects of silica fume (SF) on hydration process of composite cementitious system (CCS) as well as the pozzolanic reaction (PR) of SF in this system. Results indicate that the PR of SF has started at the end of the first day but proceeds very slowly during the rest days due to the agglomeration of SF particles; and the starting point of PR is far earlier than that of drop of CH content, which implies that it is not suitable to mark conventionally the drop of CH content as the starting point of PR.

• Periodical: Applied Mechanics and Materials (Volumes 584-586)
• Pages: 1237-1242
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.584-586.1237
• Online since: July 2014
• Authors: Yong Qi Wei*, Wu Yao
• Keywords: Pozzolanic Reaction (PR), Quantitative Phase Analysis (QPA), QXRD/Rietveld Method, Silica Fume (SF), TG-DSC

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