ความต้านทานการแทรกซึมของคลอไรด์ของคอนกรีตที่ผสมเถ้าก้นเตาบดละเอียด

Abstract

This research was to study chloride penetration resistance in ground bottom ash concretes. The mix proportion of control concrete was designed compressive strength at 28 days of 200, 300, and 400 ksc. Bottom ash from Mae Moh power plant was developed a quality by grinding until the particle size retaining on sieve No. 325 less than 5% by weight. Then ground bottom ash was used to replace Portland cement type I at the rate of 0, 10, 20, 30, and 40% by weight of cementitious material. Compressive strength and resistance to chloride penetration of concrete were determined at the ages of 28, 60, and 90 days. The chloride penetration was evaluated by using measurement of the total charge passed in Coulombs and it was conducted in accordance with ASTM C 1202. The full immersion test in 3% NaCl solution was used and the chloride penetration fronts into concrete specimens were determined using 0.1 N silver nitrate indicator to compare different color. Experimental results from both methods indicated that the resistance to chloride penetration depended on designed strength and percent replacement of ground bottom ash. At all designed strengths, concretes with the 40% replacement of ground bottom ash were the highest chloride penetration resistance. At the different strength, it was found that concrete which designed the higher strength gave the better resistance to chloride penetration. The results confirmed that ground bottom ash could be used for chloride penetration resistance in concretes.