Effect of natural zeolite on the compressive strength and freeze-thaw resistance of Portland cement

Effects of zeolites in various natural deposits as replacement cementing material on mechanical performance of Portland cement were studied. The blended cement pastes with zeolites were cured at room temperature in air for various durations (1, 7 and 28 days). Mechanical performance of the blended cement samples such as setting time, volume of water, compressive strength, normal consistency and freeze-thaw resistance of the mortar are determined. The optimal substitution ratio was 20 wt. % of zeolite for all ages of blended cement pastes. It is revealed by adding 20% of natural zeolite into Portland cement, that the compressive strength increased from 485 kg/cm2 to 690 kg/cm2. It is clear that mechanical-chemical activation of natural zeolite is effective way in preparation of blended cement with zeolite.