Properties of a New Type of Polycarboxylate Admixture for Concrete Using High Volume Blast Furnace Slag Cement

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Title: Properties of a New Type of Polycarboxylate Admixture for Concrete Using High Volume Blast Furnace Slag Cement

Author(s): Shinji Tamaki; Kazuhide Saito; Kazuhisa Okada; Daiki Atarashi; and Etsuo Sakai

Publication: Special Publication

Volume: 302

Issue:

Appears on pages(s): 113-124

Keywords: adsorption; blast-furnace slag; blast-furnace slag cement; chemical admixture; fluidity retention ability

Date: 6/1/2015

Abstract:
Several studies have been pursued in Japan on developing concrete using high volume blast-furnace slag cement for reducing CO2 emissions arising from calcination of cement. However, when using high volume blast-furnace slag cement, various problems are encountered, such as decreased fluidity retention ability caused by the reduction of admixture dosage and decreased strength enhancement. In this paper, the authors focus on the adsorption properties of polycarboxylate ether superplasticizers and the properties of hardened concrete that incorporates a component of high volume blast-furnace slag cement, and discuss the development of a new type of superplasticizer through molecular design and optimization of the admixture composition. The admixture improved the fluidity and properties of hardened concrete using slag cement containing more than 60% blast-furnace slag.