Affiliation:
1. Wuhan University of Technology
2. Headquarters of Yichang-Badong Highway Construction of Hubei Province
Abstract
Contamination of aggregates with gypsum occurs frequently. Fine aggregate has more detrimental effect due to its large surface area. An experimental work had carried out to investigate the behavior of mortar made from six SO3 contents in the fine aggregate, five size fractions of gypseous aggregate and three C¬3A contents in the cement. The results show that significant expansions do not occur within mortar bars if the content of SO3 lies below 1.25% by the weight of fine aggregate and the reduction in strength is higher in later ages and for higher SO3 contents. The size fraction of gypseous aggregate also affects the degree of expansion, especially in the case of fine particles. The cement with C3A content lower than 5% can tolerate a higher level of contaminant gypsum.
Publisher
Trans Tech Publications, Ltd.
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