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      OBSERVATIONS OF PEAK STRENGTH BEHAVIOR IN CSA CEMENT MORTARS

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          Abstract

          The purpose of this study was to assess the mechanical property performance behavior of calcium sulfoaluminate (CSA) cement mortar when cured at ambient laboratory temperature of ~23°C (73°F) and constant 50% relative humidity for an extended period of time. Four CSA cement mortars were tested. Three CSA cement mortars contained equivalent mass amounts of calcium sulfate; whereas, the fourth mortar contained double the amount of calcium sulfate. The three CSA cement mortars containing constant mass amounts of calcium sulfate differed as the specific type of calcium sulfate varied across the three formulations—one mortar containing solely anhydrite, one mortar contained half anhydrite and half gypsum while the other mortar solely contained gypsum. The fourth mortar contained double the amount of calcium sulfate when compared with the others while having a 1/1 blend of anhydrite and gypsum. Specific mortars were either tested for direct tensile strength according to ASTM C307 or for compressive strength according to ASTM C109. All tested mortars displayed statistically significant strength loss trends versus time when cured at constant 50% relative humidity. Cement paste samples were analyzed with TGA/SDT and XRD in an effort to identify microstructure changes corresponding to observed strength loss. Cement paste analysis suggests strength loss within the tested CSA cement mortars occurred as a result of ettringite decomposition.

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          Most cited references 16

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          Industrially interesting approaches to “low-CO2” cements

           Ellis Gartner (2004)
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            Sustainable cement production—present and future

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              High-performance cement matrices based on calcium sulfoaluminate–belite compositions

               L. Zhang,  F.P Glasser (2001)
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                Author and article information

                Journal
                jgrb
                Journal of Green Building
                College Publishing
                1552-6100
                1943-4618
                1943-4618
                Summer 2013
                : 8
                : 3
                : 97-115
                Author notes

                1University of Kentucky, College of Engineering, 351 Ralph G. Anderson Building, Lexington , KY 40506-0503.

                Article
                jgb.8.3.97
                10.3992/jgb.8.3.97
                ©2013 by College Publishing. All rights reserved.
                Page count
                Pages: 19
                Product
                Categories
                RESEARCH ARTICLES

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