Abstract
Low-alkalinity cement based on sulfoaluminate-belite clinker was produced experimentally. Fresh properties and hardening behavior of mortar and concrete were examined using this cement. Generally, development of compressive strength was good, but the early stage of strength tended to decrease when a large quantity of retarder was used. Additionally, results clarified that the C/W and compressive strength did not have linearity relations after the age of 7 days. Because of replacement of some cement with fly ash or limestone powder, less strength was gained, but practical strength was secured. Additionally, reduction of the adiabatic temperature rise and improvement of fluidity of concrete was confirmed. Regarding volume change, shrinkage occurred immediately after setting, but it soon changed to expansion and was maintained to the age of 10-30 days. At 1 year, displacement from the base point was approximately zero when using standard grain size cement; shrinkage of 100-150×10-6 was observed when using fine cement.
