In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
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 Fly Ashes on the Drying
Shrinkage of Superplasticized Concretes in the Presence of SRA
Author(s): A. Borsoi, M. Collepardi, S. Collepardi, and R. Troli
Publication: Special Publication
Appears on pages(s): 287-296
Keywords: beneficiated fly ash; chemical admixtures; drying shrinkage; fly ash; shrinkage-reducing admixtures; superplasticizers.
Abstract:Concretes with portland cement in the presence of fly ash or beneficiated
fly ash (BFA) all at a slump of about 240 mm (9.4 in.) were made. Fly ash or BFA was used as mineral addition replacing 20% of portland cement in both plain and superplasticized concretes with or without shrinkage-reducing admixtures (SRA).
The 28-day compressive strength of the superplasticized and plain concretes without mineral addition were higher than those of the corresponding concretes with fly ash and lower than that with BFA.
Drying shrinkage of specimens exposed to a dry environment with relative humidity of 50% up to 4 months was measured. In the presence of fly ash the drying shrinkage decreased by about 15% with respect to the corresponding plain concretes without fly ash. In the presence of a superplasticizer and/or a SRA there was further reduction in dry shrinkage of fly ash mixtures.
The drying shrinkage of concretes, where portland cement was replaced by BFA was lower than that of the corresponding concretes with fly ash. Even in the presence of superplasticizer and/or SRA a further reduction of drying shrinkage of BFA concretes was found.
In fly ash or BFA concrete mixtures, and more significantly in the presence of
superplasticizer and/or SRA, the cracking in restrained slabs was reduced in terms of both the number and the width of cracks.
Click here to become an online Journal subscriber