Effect of Temperature on the Properties of Mortars and Superplasticized Concrete Containing Low-Calcium Fly Ash

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Title: Effect of Temperature on the Properties of Mortars and Superplasticized Concrete Containing Low-Calcium Fly Ash

Author(s): Raymundo Rivera V.

Publication: Special Publication

Volume: 91

Issue:

Appears on pages(s): 219-230

Keywords: concretes; consistency; fly ash; low temperature; mortars (material); plasticizers; portland cements; setting (hardening); temperature.

Date: 2/1/1986

Abstract:
This paper reports the effect of temperature on the properties of mortars and concrete containing low calicum fly ash. The mortars were made using ASTM methods and 30% of cement (by weight) was replaced by the fly ash. The mortars were made, and test specimens were cast and cured at 15, 23, and 38 degrees C. Any loss in flow was compensated for by the use of a superplasticizer. The high slump concretes in which 30% of cement (by weight) was replaced by fly ash were also made; test cylinders were cast and cured at 15, 23, and 38 degrees C. Once again, any loss in slump was compensated for by the use of a superplasticizer. The test data indicate that temperature has significant effect on the setting time of mortars, and slump loss of concrete and its strength properties. The setting times of mortars are increased at low temperatures and their values show further increases when a superplasticizer is used. In concretes incorporating fly ash and a superplasticizer, slump loss was accelerated at 15 degrees C, with slight retardation occuring at 38 degrees C.