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粉煤灰對混凝土AAR有效堿的影響及機理

發布時間: 2012-09-15 11:27 查看: 2177次

混凝土堿集料反應有效堿粉煤灰混凝土孔溶液
摘要：

為準確從堿與活性集料反應的角度掌握堿集料反應(AAR),在前人研究基礎上,賦予有效堿更進一步的定義,將進入活性集料中的堿稱為有效堿.采用火焰光度法對有效堿含量和混凝土孔隙溶液堿離子濃度進行了測定,并據此分析了粉煤灰抑制AAR機理.試驗結果表明:摻加粉煤灰后,混凝土基體孔隙溶液堿離子濃度降低,從而減少了活性集料中的有效堿,而粉煤灰摻入改變基體擴散系數對有效堿的影響則是次要的.因此可通過測量早期孔隙溶液堿離子濃度變化來評價粉煤灰對AAR的抑制效果.

Abstract：

A further definition of effective alkali is proposed based on the studies of predecessors and the alkali entering aggregates is called effective alkali,which is adopted to grasp alkali aggregates reaction (AAR) accurately from the reaction angle of alkali and reactive aggregates.The effective alkali content and alkali ions concentration of concrete pore solution were investigated by flame photometry and accordingly the inhibitory mechanism of fly ash on AAR was analyzed.The results show that after the addition of fly ash the alkali ions concentration of concrete pore solution decreases,which reduces the effective alkali in reactive aggregates,while the influence of paste diffusion coefficient change for alkali ions on the effective alkali is secondary.Therefore,the inhibitory effect of fly ash on AAR can be evaluated by measuring the early alkali ions concentration change of concrete pore solution.

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