Ảnh hưởng của bột đá vôi đến tính chất của xi măng Póoc Lăng

Abstract

In this study limestone powders with different particle sizes of 1.6 and 4.5 (m were ust'd to replace a part of Portland cement in different replacement levels to produce Portland-limesPne cement pastes. The percentages of limestone replacement are 0, 5, 10, 15 and 20% by weight. The effect of fineness and the amount of limestone powders on compressive strength and set¬ting time are investigated. It has been established that limestone replacement causes reduce the compressive strength due to the dilution effect. The fineness of limestone powder used has influ-ence on the observed compressive strength values. Both initial and final setting times were increased with an Increase in the amount of limestone. Furthermore, at the same level replace¬ment the cement pastes using 1.6 pm of limestone show lower setting time than that using 4.5 pm, respectively.