Effect of Temperature on the Properties of Superplasticized Concrete


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Title: Effect of Temperature on the Properties of Superplasticized Concrete

Author(s): Y. Yamamoto and S. Kobayashi

Publication: Journal Proceedings

Volume: 83

Issue: 1

Appears on pages(s): 80-87

Keywords: air entrainment; bleeding (concrete); compressive strength; concretes; freeze-thaw durability; plasticizers; setting (hardening); temperature.

Date: 1/1/1986

Properties of superplasticized concrete were examined under three different temperatures: 7, 20, and 35 C (44.6, 68.0, and 95.0 F). The properties examined include bleeding, setting time, losses with time of air content and slump, compressive strength, and freeze-thaw resistance. Three normal types of superplasticizers were used throughout the experiment. When the tests were made at 35 C (95.0 F), the retarding types of the three superplasticizers were also employed. Additionally, the effect of the presence of a retarding type of water-reducing admixture was studied at the highest temperature. It was observed that less superplasticizer was required at a lower temperature, which became quite significant in the temperature range below 20 C (68.0 F). Using retarding types of superplasticizers was effective in reducing slump loss only at the highest temperature. While most of the properties of concrete were not significantly altered by superplasticizing, considerable bleeding was observed in superplasticized mixtures, especially when the setting time of the respective initial mixtures was delayed. A proposal was made to entrain about 0.5 percent more air than in ordinary concrete to overcome the tendency of the poor freeze-thaw resistance of superplasticized concrete.