ปริมาณเถ้าแกลบดำที่เหมาะสมสำหรับงานคอนกรีตโครงสร้างทั่วไป

Abstract

The objective of this research is to investigate the compressive strength of the concrete containing black rice husk ash for structural concrete work. The studied parameter was the replacement percentages of cement by black rice husk ash at 5, 15 and 20 by weight of cementitious materials. The testing of the compressive strength was at the age of 3 days, 7 days, 14 days and up to 28 days. The concrete specimen was in a cylindrical shape with 10 centimeters in diameter and 20 centimeters in height. The test results showed that the strength of concrete increased comparable to the increased age of testing. The compressive strength of concrete containing black rice husk ash decreased while the replacement percentages of black rice husk ash increased. The suitable replacement percentage of black rice husk ash is at 5 by weight of cementitious materials comparable to the compressive strength of control concrete at the age of 28 days.