Research on Sulfate Resistance of Cement Mortars with High Volume of Slag by the Wet-dry Cycle Method

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Title: Research on Sulfate Resistance of Cement Mortars with High Volume of Slag by the Wet-dry Cycle Method

Author(s): Qian Bi and Yamei Zhang

Publication: China Concrete and Cement Products

Volume:

Issue: No.4 2010(Total 174)

Appears on pages(s): 1-5

Keywords: Slag,Cement mortar, Sulfate resistance, Wet-dry cycle, Expansion ratio

Date: 8/20/2010

Abstract:
The wet-dry cycle method is used to evaluate the sulfate resistance of cement mortars with high volume of slag.Volume expansion ratio,mass change and strength change are examined to evaluate the damage after the mortars are immersed in 5% MgSO4 solution or in 5% Na2SO4 solution.And SEM analysis is taken for the erosive mortar specimens.After 60 cycles with short-time immersion and long-time drying,the specimens immersed in 5% MgSO4 solution show a better condition compared to those immersed in 5% Na2SO4 solution.The SEM photos show that a large amount of non-binding capacity materials had formed inside the mortars immersed in 5% MgSO4 solution.However,a lot of expansive needle shaped crystalline is observed in the pores of those mortars immersed in Na2SO4 solution.
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