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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Influence of Maximum Aggregate Size
on Compressive Strength of Concrete
Exposed to Evaporation Immediately
Author(s): Dan Ravina
Publication: Journal Proceedings
Appears on pages(s): 582-588
Keywords: aggregate size; aggregates: compressive strength; concretes; cracking (fracturing) : evaporation; fresh concretes: hot weather construction: microcracking: plastic shrinkage: research; tensile stress.
Abstract:The influence of maximum aggregate size on the compressive strength of concrete and microconcrete (sieved mortar), exposed to evaporation immediately after casting, was studied. The main variants were: (a) maximum aggregate size 1/4 in. (19.05 mm), 1/2 in. (12.5 mm), 3/8 in. (9.6 mm), 3/16 in. (4.8 mm); (b) time of exposure to evaporation- 0, 45, 90 and 300 min. Concrete and air temperature in the first 24 hr 30 C (86 F); initial rate of evaporation about I kg/m2/hr (0.2 Ib/sq ft/hr). It was found that the aggregate restrains the plastic shrinkage associated with drying. The resulting tensile stresses impair the properties of the concrete, as internal cracking and reduction in strength were observed. The larger the maximum aggregate size or aggregate content, the higher the internal cracking and the loss of strength after 5 hr exposure to evaporation: 21, 12 and 5 percent, for concretes with maximum aggregate size of 3/4, 1/2 and 3/8 in., respectively.
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