| 摘要 |
A low heat buildup cement composition with a ratio of the compressive strength to the heat of hydration of at least 7.0 at an age of 13 weeks, developed particularly for use in massive concrete work. One invention of the composition comprises a powder which is produced by mixing the raw materials of CaO, SiO2 and Al2O3 together followed by melting, quenching and pulverizing, is mainly amorphous and has a CaO to SiO2 ratio of 0.8 to 1.5 by mole and an Al2O3 content of 10 wt % or less. Another invention thereof comprises a powdery mixture composed of at least 70 wt % of a powder which is the same as the one used in the above invention in respect of the CaO to SiO2 ratio and the amorphousness but is different therefrom in that the Al2O3 content is 12 wt % or less and at most 30 wt % of a stimulative such as portland cement. |
