ผลกระทบของผงแคลเซียมคาร์บอเนตต่อกำลังอัดของซีเมนต์ปอร์ตแลนด์มอร์ต้าร์ผสมเถ้าแกลบจากโรงไฟฟ้า

Abstract

Abstract

This paper presented the development of the compressive strengths of mortars consisting of Portland cement Type 1 of which was replaced by rice husk ash (RHA) from electric power plant and calcium carbonate (CaCO₃) that having averaged particle sizes (D[4,3]) of 29.30, 3.80 and 4.50 mm, respectively with the replacement levels at 0%, 20% and  40% by weight of powder materials. The water-to-powder materials ratios equal to the water requirement conforming to flow value at 110% ± 5%. From the test results, it was found that CaCO₃ can reduce the water requirements of mortars. At 28 days, mortar containing 5% RHA and 15% CaCO₃ had the highest compressive strength. Whereas, at the age of 150 days, the 10% RHA and 10% CaCO₃ mortar is the highest development in strength and also similar to the control mortar.