Compressive Strengths of Lean Concretes Containing Fly Ash

by David Whiting, Construction Technology Lab Inc, United States,



Document Type: Proceeding Paper

Part of: Serviceability and Durability of Construction Materials

Abstract:

The compressive strength development of lean concretes containing fly ash was evaluated. Concretes were prepared at total cementitious materials contents of 423, 517, and 564 lb/yd³ (251, 307, and 335 kg/m³). Six fly ashes were chosen for evaluation at cement replacement levels of 25 and 50% by mass in each of the mixtures. Specimens representative of residential flat work were prepared and cured for one and seven days under moist conditions, then air-dried until testing at ages from one day through 365 days. Results indicate that using mixture proportions and curing regimens typical of residential construction practice, fly ash concrete mixtures will, in general, result in slower strength gain and lower ultimate strength than corresponding mixtures prepared without fly ash. At high ash levels (50%) it may not be possible to meet current ACI requirements on minimum strength for residential concrete construction.

Subject Headings: Compressive strength | Strength of materials | Fly ash | Residential construction | Tensile strength | Concrete | Mixtures

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