講演情報
[1K0601-08-07]（学生発表：修士課程） フライアッシュｰCa(OH)2固化体の強度発現に及ぼす無機塩類の影響
○郎 傲然1、胡桃澤 清文1 (1. 北海道大学)
司会：大川 浩一（秋田大学）
キーワード：
フライアッシュ、強度発現、無機塩、選択溶解法
Fly ash is produced in large quantities all over the world and is widely used in concrete products. This study investigated whether inorganic salt additives (Na2SO4, CaCl2, Ca(NO3)2, Ca(NO2)2 ) could improve the initial strength of fly ash- Ca(OH)2 system. Various tests were conducted to verify the effects including compressive strength, ultrasonic pulse velocity (UPV), X-ray diffraction (XRD) and selective dissolution. The results showed (1) Na2SO4 has a relatively good improvement on the initial strength of fly ash- Ca(OH)2, and its subsequent strength also increased stably, (2) the improvement of CaCl2, Ca(NO3)2, Ca(NO2)2 on the strength of fly ash- Ca(OH)2 are a little later than that of sodium sulfate, but in 56 days, the improvement of these four salts can reach a similar degree. The results of selective dissolution showed that the reaction of fly ash with the inorganic salt was added was promoted.