混合材对碱—硅反应的作用 Ⅰ.混合材对碱—硅反应膨胀的作用

Effect of Mineral Admixture on Alkali-Silica Reaction Part Ⅰ: The effect of minearl admixture on the expansion of alkali-silica reaction

研究了在70℃条件下硅灰、矿渣和粉煤灰对碱-硅反应膨胀的影响规律。结果表明,硅灰、矿渣和粉煤灰这三种混合材并非是在所有的条件下都能有效地抑制碱-硅反应膨胀。硅灰在掺量为10%以下时对碱-硅反应膨胀没有显著影响,掺量为15%￣20%时也仅仅能延缓碱-硅反应膨胀。矿渣在掺量为30%￣70%范围内能延缓碱-硅反应膨胀,但不能有效地抑制碱-硅反应膨胀。粉煤灰在掺量为10%时对碱-硅反应膨胀没有显著影响,掺量为20%￣30%范围内能延缓碱-硅反应膨胀,但不能有效地抑制碱-硅反应膨胀,掺量超过50%后有可能抑制碱-硅反应膨胀。

In the paper,the influence of silica fume, slag and fly ash on alkali-silica reaction under the condition of 70℃ is studied. The results show that silica fume, slag and fly ash may inhibit alkali-silica reaction only under a suitable content, i.e. for silica fume, when the content is less than 10%, it doesn＇t influence markedly the expansion of alkali-silica reaction; when the content is in 15%～20%, it only may delay the expansion of alkali-silica reaction. And for slag, when the content is in 30%～70%, it only may delay the ex-pansion of alkali-silica reaction, but cannot inhibit the expansion of alkali-silica reaction. But for fly ash, when the content is in 10%, it doesn＇t markedly influence the expansion of alkali-silica reaction, and when the content is in 20%-30%, it only may delay the expansion of alkali-silica reaction, but cannot inhibit the expansion of alkali-silica reaction. However, when the content is over 50%, it is possible that fly ash can effectively inhibit alkali-silica reaction.