Influence of Fly Ash on Alkalinity of Pore Solution and Microstructure Characteristics of Hardened Cement Pastes

Abstract:

Influence of fly ash on alkalinity of pore solution and microstructure characteristics of hardened cement pastes were investigated by means of ex-situ leaching (ESL), MIP and SEM. The results reveal that the decline of alkalinity of pore solution is not endless, even though the contents of fly ash in fly ash-cement(FC) pastes is very high(65%).The incorporation of fly ash in proper ratios could increase the ratio of harmless pores and improve the microstructure of the FC pastes. Ca(OH)2 was not consumed heavily or exhausted when cementitious material was hydrated due to the low reaction degree of fly ash.

• Periodical: Applied Mechanics and Materials (Volumes 253-255)
• Pages: 322-325
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.253-255.322
• Online since: December 2012
• Authors: Jian Jun Yan, Xiang Li, Hua Quan Yang
• Keywords: Alkalinity, Cement, Fly Ash (FA), Microstructure, Paste

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