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Effects of alkali dosage and silicate modulus on alkali-silica reaction in alkali-activated slag mortars
Cement and Concrete Research ( IF 11.4 ) Pub Date : 2018-09-01 , DOI: 10.1016/j.cemconres.2018.06.005
Zhenguo Shi , Caijun Shi , Shu Wan , Zuhua Zhang

Abstract The effects of silicate modulus and alkali dosage on alkali-silica reaction (ASR) of alkali-activated slag (AAS) mortars are investigated under accelerated mortar bar testing conditions as specified in ASTM C1260. At a given alkali dosage, an intermediate silicate modulus with respect to highest ASR expansion is observed, which increases from 1.0 to >2.0 with increase of alkali dosage. The effect of silicate modulus on ASR expansion is found to be governed by the pore solution alkalinity. At a given higher silicate modulus such as 1.5 and 2.0 at 14 day, the ASR expansion tends to increase with increase of alkali dosage, whereas it decreases with increase of alkali dosage at a given lower silicate modulus such as 0–0.5 at 28 day. The mechanism governing the effect of alkali dosage on ASR expansion is more complicated and cannot be explained by only the pore solution alkalinity.

中文翻译:

碱用量和硅酸盐模量对碱活化矿渣砂浆中碱-硅反应的影响

摘要 在 ASTM C1260 规定的加速砂浆棒测试条件下,研究了硅酸盐模量和碱用量对碱活化矿渣 (AAS) 砂浆的碱-二氧化硅反应 (ASR) 的影响。在给定的碱剂量下,观察到最高 ASR 膨胀的中间硅酸盐模量,随着碱剂量的增加,该模量从 1.0 增加到 >2.0。发现硅酸盐模量对 ASR 膨胀的影响受孔隙溶液碱度的控制。在给定的较高硅酸盐模量(例如 1.5 和 2.0)下,第 14 天时 ASR 膨胀趋于随着碱剂量的增加而增加,而在给定的较低硅酸盐模量(例如 0-0.5)下,ASR 膨胀随碱剂量的增加而减小,例如第 28 天。
更新日期:2018-09-01
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