Properties of Concrete Using Newly Developed Low-Heat Cements and Experiments with Mass Concrete Model
S. Nagataki, T. Sone, and A. Matsui
Appears on pages(s):
adiabatic conditions; blast furnace slag; blended cements; cements; cracking (fracturing); fly ash; low heat cements; mass concrete; temperature; Materials Research
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.