The Durability Study of Concrete in Sulfate Environment

Abstract:

Aiming at determining the durability of concrete in very salty regions, this study examines the performance of various high performance fine aggregate concretes in a sulfate environment, such as high performance concrete inside a composite additive, and Portland cement concrete and sulfate resistant cement concrete, all of which experienced dry-wet cycles in sodium sulfate solutions. By examining the changes of elastic moduli and analyzing the SEM of the concrete, this paper has found that the salt resistance of sulfate resistant cement concrete is no better than that of Portland cement concrete in the extremely aggressive dry-wet cycle environment but high performance concrete containing a composite additive has better resistance in a sulfate environment. Besides, the composite additive can create the environment for a second hydration to reduce the amount of Ca(OH)2 inside the concrete, and build additional C-S-H gel to reform the microstructure of concrete effectively. Finally, the paper offers some advice for mixing concrete in salt regions.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 3137-3141
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.3137
• Online since: October 2012
• Authors: Hong Xia Qiao*, Yu Li, Zhong Mao He, Jin Mei Dong
• Keywords: Dry-Wet Cycle, Dynamic Elastic Modulus, High-Performance Concrete (HPC), Hydrate

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