Effect of Gypsum-Contaminated Aggregate on Long Term Properties of Mortar

Bei Xing Li; Da Ke; Ji Hong Song; Ke Jian Fu

doi:10.4028/www.scientific.net/AMR.450-451.205

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 450-451Effect of Gypsum-Contaminated Aggregate on Long...

Effect of Gypsum-Contaminated Aggregate on Long Term Properties of Mortar

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.

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Periodical:

Advanced Materials Research (Volumes 450-451)

Pages:

205-209

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.450-451.205

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Online since:

January 2012

Authors:

Bei Xing Li, Da Ke, Ji Hong Song, Ke Jian Fu

Keywords:

Aggregate, Expansion, Gypsum, Internal Sulphate Attack, Mortar, Strength

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