EVALUATION RESULT OF CEMENT WHICH CONTAINS SYNTHETIC CALCIUM CARBONATE AS MINOR ADDITIONAL CONSTITUENTS

Abstract

We conducted comparison test of cementitious materials as paste, mortar and concrete containing （a） natural limestone powder and （b） synthetic calcium carbonate powder made from Ca（OH）₂ which is by-produced when acetylene gas is manufactured as minor additional constituents respectively. The paste and mortar’s evaluations are conducted according to JIS R 5201：2015 and the test results are adapted to all the requirements of JIS R 5210：2019. The test result of the concrete containing （b） showed lower slump than （a）, however it was improved by optimizing addition of superplasticizer and the slump change over time was similar to the concrete containing （a）. The compressive strength development of （b） was mostly same level as （a）.