STUDIES ON COLD WEATHER CONCRETING BY THE USE OF SPECIAL SUPER HIGH EARLY STRENGTH CEMENT

The contents of the study were first to clarify the strength characteristics of the special super high early strength cement at different temperature, secondly, to clarify what effect freezing exerts on the increase of strenght when the concrete is subjected to freezing at the initial period of hardening, and thirdly, to clarify the resistivity when the concrete at the initial period of hardening or after sufficiently hardened is subjected to the repeated rapid freezing and thawing. It was clarified by this study (1) that the concrete using special super high early strength cement showed the very high manifestation of strength even at low temperature and short age, (2) that when the concrete was subjected to freezing at the initial period of hardening, the lowest compressive strength just before freezing, with which the increase of strength was able to be expected by continuing freezing, was about 50kg/cm2 similarly to ordinary concrete.