粉煤灰品质与抑制ASR膨胀的能力

Effect of the characteristics of fly ash on the ability to suppress ASR expansion

对比研究了2类、4种粉煤的化学和矿物组成、颗粒形貌和级配及抑制碱硅酸反应(ASR)膨胀的效果,讨论了粉煤灰品质与抑制ASR膨胀的关系。结果表明:相同掺量时,低钙粉煤灰抑制ASR能力优于高钙粉煤灰;粉煤灰同一品质指标对不同类型粉煤灰抑制ASR能力的影响不同,不同粉煤灰抑制ASR膨胀能力的差异不能简单归结为某一特定品质指标的差别,特别是品质指标绝对值及差别不大时。

The suppressing effect on ASR expansion and the characteristics of four kinds of fly ashes,including chemical constituents,mineral constituents,particle morphology and size distribution,were studied. The relationship between the characteristics of fly ashes and their ability against ASR expansion was discussed. Results showed that class F fly ash is superior to class C fly ash in suppressing ASR expansion. The same characteristic of different types of fly ashes may have different influences on the ability to suppress ASR expansion,and the difference in the ability to control ASR expansion of various types fly ashes can not be attributed to the difference of one certain characteristic,especially when the absolute content and the differences are not large enough.