Properties of Concrete Using Newly Developed Low-Heat Cements and Experiments with Mass Concrete Model

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Title: Properties of Concrete Using Newly Developed Low-Heat Cements and Experiments with Mass Concrete Model

Author(s): S. Nagataki, T. Sone, and A. Matsui

Publication: Special Publication

Volume: 132

Issue:

Appears on pages(s): 1413-1432

Keywords: adiabatic conditions; blast furnace slag; blended cements; cements; cracking (fracturing); fly ash; low heat cements; mass concrete; temperature; Materials Research

Date: 5/1/1992

Abstract:
This paper describes the characteristics of a super low-heat cement mixing the ternary components of cement, blast-furnace slag, and nace slag cement modifying portland blast-furnace slag cement into a low-heat type. The results of mass concrete model experiments conducted using these cement are also reported. The super low-heat cement used in furnace slag: fly ash at ratios of 23:50:27. The low-heat blast-furnace slag cement was a 60% mixture of blast-furnace slag in normal portland cement. In the experiments concerning characteristics of concrete, concretes using super low-heat cement or low-heat blast-furnace portland cement or portland blast-furnace slag cement Class B. Mass concrete model experiments were compared for the cases of using super low-heat cement, and portland blast-furnace slag cement Class B. According to the test results, in case of unit cement content of 300 kg/m2, the adiabatic temperature rise of concrete using super low-heat cement is approximately 15°C lower than the moderate heat portland cement. That of concrete using low-heat blast-furnace slag cement is approximately 5°C lower than portland blast-furnace slag cement Class B. Mass concrete model experiments show that the strength gain of super low-heat cement concrete is higher than that of conventional low-heat cement concrete, and this cement is effective in control of thermal cracking because of exceedingly low temperature rise.