ค่าตัวคูณประสิทธิผลและปริมาณการใช้ที่เหมาะสมของเถ้าก้นเตาบดละเอียดในงานคอนกรีต

Abstract

This research was to study the efficiency factor and optimum usage of ground bottom ash in concrete. Concretes were designed water – binder ratio at 0.48, 0.62, and 0.80. Ground bottom ash with median particle size of 6.3 mm was used to replace Portland cement at the rate of 10, 20, 30, 40, and 50% by weight of binder. Compressive strengths of concrete were test at the age of 7, 28, and 180 days to determine the efficiency factor of ground bottom ash by Papadakis equation while the maximum compressive strength showed the optimum usage of ground bottom ash in concrete. From the result, it was found that the efficiency factor of ground bottom ash decrease with increasing water to binder ratio and percentage replacement. The efficiency factor ranged from 1.75 – 0.54, 1.86 – 0.62, and 2.12 – 0.69, for the ages of 7, 28, and 180 day, respectively. The optimum usage of ground bottom ash which gave the maximum compressive strength at 180 days is cement replacement at 28% by weight for water – binder ratio at the rate of 0.48.