A Study on Reducing Shrinkage of Highly-Flowable Concrete

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Title: A Study on Reducing Shrinkage of Highly-Flowable Concrete

Author(s): A. Ogawa, K. Sakata, and S. Tanaka

Publication: Special Publication

Volume: 154

Issue:

Appears on pages(s): 55-72

Keywords: admixtures; cement additives (raw materials); concretes; cracking (fracturing); drying shrinkage; expansive cements; limestone; mix proportioning; shrinkage; viscosity; water-reducing agents; Materials Research

Date: 5/1/1995

Abstract:
In recent years, highly flowable concrete which can be placed without any consolidation has been widely studied. A basic study on this type of concrete incorporating limestone powder and a method for reducing shrinkage properties of the concrete are presented in this paper. In the mixture proportioning for the concrete, a high-range water-reducing admixture is used to increase the flowability of concrete. A small amount of viscosity-increasing agent is also added to minimize the segregation. Limestone powder, which is a low reactivity material, is used to reduce the heat of cement hydration and shrinkage of concrete. Although drying shrinkage of the highly flowable concrete incorporating limestone powder was smaller than that of ordinary concrete or other highly flowable concretes, shrinkage of the concrete needs to be further reduced so that it will be a crack-free concrete. To accomplish this, a method for reducing drying shrinkage of concrete by applying a shrinkage-reducing agent and an expansive additive was tested and good results obtained.