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REMEDIES TO RAPID SETTING IN HOT-WEATHER CONCRETING . ADMIXTURES FOR CONCRETE: IMPROVEMENT OF PROPERTIES. PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM HELD BY RILEM (THE INTERNATIONAL UNION OF TESTING AND RESEARCH LABORATORIES FOR MATERIALS AND STRUCTURES), BARCELONA, MAY 14-17, 1990

El-RMS

Abstract

Concreting in very hot weather results in undesirable problems that could impair the properties and serviceability of concrete. This paper presents the results of a comprehensive experimental work aimed at evaluating the effect of ambient air temperatures on the times of initial and final setting of concrete having a wide range of water-cement ratios, and placed in extremely hot climates. Relationships between the setting behaviour and various influencing factors are investigated. Remedies intended to eliminate the adverse effects of rapid setting by selecting temperature - dependent optimal dosages of a water-reducing and set-retarding admixture are described. An expression is proposed for the admixture dosage necessary to prolong the setting time by a specified percentage when a concrete of any water-cement ratio is placed at a high environment temperature. (Author/TRRL)

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Key concepts: Serviceability (structure), Hot weather, Cement, Environmental science, Engineering, Water–cement ratio, Forensic engineering, Work (physics)