INFLUENCE OF BLENDED CEMENTS ON THE CONCRETE RESISTANCE TO CARBONATION

摘要

The influence of high calcium fly ash as clinker replacement in blended cements on the resistance of concrete structures to the carbonation is presented. The paper concerns of five blended cements made with different contents of supplementary cementitious materials:high and low calcium fly ash and ground granulated blastfurnance slag and one reference cement - Portland cement. The aim was to study the carbonation depth on several concretes designed with a constant water to binder ratio and with various blended cements. Additionally, the prediction of the maximum carbonation depth was proposed. The evaluation of the microstructure was performed using optical microscopy on thin sections in transmitted light. The best results according to the resistance to carbonation achieved the concretes made with Portland-fly ash cement where 14.3 % of high calcium fly ash was used. CEM Ⅱ/A-W can be used to prove the ?_(c28) and resistance to carbonation for XC3 class.