Durability of Concrete Containing an Ester-Amine Admixture Exposed to Sulfate and Sulfuric Acid Solutions

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Title: Durability of Concrete Containing an Ester-Amine Admixture Exposed to Sulfate and Sulfuric Acid Solutions

Author(s): S. L. Amey, J. Buffenbarger, J. Daczko and D. A. Johnson

Publication: Special Publication

Volume: 173

Issue:

Appears on pages(s): 1001

Keywords: Admixtures; concretes; durability; permeability; sulfates

Date: 9/1/1997

Abstract:
An investigation is presented to evaluate the effect an ester-amine admixture (EA) has on the durability of concrete exposed to sulfate and sulfuric acid solutions traditionally detrimental to concrete. Prisms were exposed to a MgS04 environment under cyclic wet/dry conditions for 336 days. Other prisms were exposed to a H2 S04 environment at pH=l for 100 days. During the sulfate exposures, the concrete specimens were evaluated by appearance and length change over time. During the sulfuric acid exposures, the concrete specimens were evaluated by the pH changes of the test solution. The ester-amine admixture was shown to be beneficial in reducing the initial susceptibility of concrete exposed to both environmenfs. This benefit was also observed to improve the resistance of already low permeability concrete containing pozzolans such as fly ash and silica fume. The behavior was explained by the admixture’s reaction products which line the concrete pore matrix. A mechanism that differentiates the action of the EA from other permeability reducing materials (e.g., pozzolans) is proposed.