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用化学纯的NaCl、NaOH、KCl、KOH来调整水泥中当量碱含量达到1.0%,采用砂浆棒法快速判定集料的潜在碱活性;用粉煤灰和磨细矿渣粉等量取代部分硅酸盐水泥,并评价这两类矿物掺合料对抑制碱-硅酸反应的效用。试验结果表明,用分子量比值作为当量碱计算的权值得到的当量碱,不能真正反映混凝土中总碱量与ASR膨胀率之间的规律;相同掺量条件下,粉煤灰抑制ASR的作用显著优于磨细矿渣粉;为有效避免混凝土发生ASR,并尽量满足混凝土的其他性能,可采取水泥∶磨细矿渣粉∶粉煤灰=40∶40∶20的胶凝材料体系。
Adjusting the equivalent alkali content of cement to 1.0% with chemically pure NaCl, NaOH, KCl and KOH, and quickly judging the potential alkali activity of the aggregate by the mortar bar method; replacing part of the silicic acid with the same amount of fly ash and ground slag powder Salt cement, and evaluate the effectiveness of these two types of mineral admixtures in inhibiting alkali-silicate reactions. The experimental results show that the equivalent alkali obtained by using the molecular weight ratio as the equivalent alkali can not truly reflect the law between the total alkali content in concrete and the ASR expansion rate. Under the same dosage, the effect of fly ash in inhibiting ASR is significant Better than grinding slag powder; In order to effectively prevent the occurrence of concrete ASR, and try to meet the other properties of concrete, can take cement: ground slag powder: fly ash = 40:40:20 cementitious material system.