EFFECTIVENESS OF SUPPLEMENTARY CEMENTING MATERIALS FOR REDUCING THE SULFATE ATTACK IN BLENDED CEMENTS
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Published:2002
R E Rodriguez-Camacho, R Uribe-Afif, J J Flores-Martinez, 2002. "EFFECTIVENESS OF SUPPLEMENTARY CEMENTING MATERIALS FOR REDUCING THE SULFATE ATTACK IN BLENDED CEMENTS", Challenges of Concrete Construction: Volume 6, Concrete for Extreme Conditions: Proceedings of the International Conference held at the University of Dundee, Scotland, UK on 9–11 September 2002, Ravindra K. Dhir, Michael J. McCarthy, Moray D. Newlands
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The use of supplementary cementing materials for reducing the sulfate attack has increased; due to they form cementing compounds that increase this resistance. This study shows an evaluation of different Mexican natural pozzolans and mineral admixture finely divided. It was determined their chemical composition and pozzolanic activity according to ASTM C 311 and 1240 Methods. Mortar bars with blended cements were making according to ASTM C 1012 test method using 5% sodium sulfate solution. It was determined the length change in the mortar bars exposed to a sulfate solution. Expansion measurement was conducted for one year to allow an adequate penetration of sulfate ions to the interior of mortar. Besides, microscopic observations were made to verify the formation of cracks on the mortar bars that showed an increase in the expansion and their state after one year in sulfate solution. The results of expansion development are showed. Satisfactory evidences about performance of the blended cements and the supplementary cementing material type used were gotten.
INTRODUCTION
SCOPE OF INVESTIGATION
EXPERIMENTAL METHODS
TEST METHODS
RESULTS AND DISCUSSION
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