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Research on Hydration of Waterproof-Typed Semi-Hydrated Gypsum

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Abstract:

The influences of saline waterproof agent composed of carboxylic acid sodium (RCOONa), Al2(SO4)3, K2SO4 on the hydration of semi-hydrated gypsum were investigated. The results showed: (1) with the concentration of K2SO4 increasing, the ζ potential rose due to the increasing K+ entering the electric double layer of gypsum; (2) with the concentration of Al2(SO4)3 heightening, the ζ potential gradually decreased as a result of the formed AFt phase during the hydration process and the increasing Al3+ entering the electric double layer of gypsum. The ζ potential rose because the RCOO- base groups adhered to the surface of gypsum crystal, which slowed down the growth rate of the gypsum crystal in direction c, and short hexahedron poles were produced.

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Periodical:

Advanced Materials Research (Volumes 306-307)

Pages:

909-912

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.306-307.909

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Online since:

August 2011

Authors:

Jian Quan Li, Ming Zhu Gong, Guo Zhong Li

Keywords:

Adhesion, Crystal Growth, Electric Double Layer, Hydration, Saline Waterproof Agent

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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