จีโอโพลิเมอร์เพสต์ที่ทำจากเถ้าถ่านหินและเถ้าชีวมวล ตอนที่ 1 : ผลกระทบของสัดส่วนผสมต่อกำลังอัด

Abstract

The aims of this research is to study the influence of solid to total weight ratio (S/T), fly ash to rice husk-bark ash ratio (FA: RHBA), sodium hydroxide (NaOH)  concentration  and sodium silicate solution to sodium hydroxide ratio (Na₂OSiO₂: NaOH) on compressive strength of geopolymer pastes. Besides, the influence of curing temperature on those of pastes was investigated. Samples in 3 x 6 centimeters cylindrical shape were employed to measure compressive strength of pastes at 3, 7, 14, 28, and 90 days. 

The results revealed that the increase of solid portion in paste enhanced compressive strength of geopolymer paste. This was due to the less water to binder ratio. Among varied FA: RHBA ratios, it was found that FA: RHBA of 40: 60 gave the highest compressive strength which was 510 ksc at 28 days. Degree of concentration of NaOH affected on compressive strength of geopolymer paste after 28 days. The higher alkalinity showed better compressive strength development at the later age. It was found that curing temperature at 60 ^oC for 24 hours boosted the rate of compressive strength development in short time.