Freezing and Thawing Durability of Highly-Flowable and Self-Compactable Concrete


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Title: Freezing and Thawing Durability of Highly-Flowable and Self-Compactable Concrete

Author(s): Yasuhiko Yamamoto and Kazuki Harada

Publication: Special Publication

Volume: 170


Appears on pages(s): 899-918

Keywords: Cold weather construction; compressive strength; concretes; durability; freeze thaw durability; modulus of elasticity; tests.

Date: 7/1/1997

Highly-flowable and self-compactable concretes (HFSCC) containing various types of powder materials were tested for their freezing and thawing resistance. The powder materials incorporated into the concrete include four kinds of cements, and two mineral admixtures that were used for replacing a part of normal portland cement. For most of concrete mixtures, water-to-powder materials ratio was fixed at 0.35 by weight, and a proper amount of viscosity-modifying admixture was added in them in addition to air-entraining and high-range water-reducing admixture. Concrete specimens were subjected to freezing and thawing test at the ages of 2 or 3 days, 14 days and 28 days. The results were analyzed utilizing a new technique proposed by one of the authors, with which the continued hydration of cementitious materials during the freezing and thawing test could be properly taken into account. It was found that the conventional procedures for determining the durability factor were not appropriate for young age concretes in which slowly hydrating cementitious materials were used. Another main conclusion was that the same precautions as those for ordinary concrete should be applied to the cold weather concreting of HFSCC, even when its water-cement ratio was as low as 0.35.