粉煤灰化学成分对其抑制碱骨料反应效果影响试验研究

Experimental study on the effect of chemical composition of fly ash on its inhibition of alkali aggregate reaction

采用快速砂浆棒法,研究了不同化学成分含量粉煤灰抑制碱骨料反应的效果。试验表明:F类粉煤灰抑制碱骨料反应效果明显优于C类粉煤灰,且粉煤灰掺量越高抑制效果越好。统计分析表明,粉煤灰化学成分与其抑制碱骨料反应效果存在很好的相关性,抑制效果与SiO_(2)+Al_(2)O_(3)+Fe_(2)O_(3)总质量分数存在线性正相关,与CaO含量存在线性负相关,与碱含量没有直接相关性。

The effect of fly ash with different chemical composition on inhibiting alkali aggregate reaction was studied by rapid mortar bar method.The test shows that the inhibition effectiveness of F type fly ash on alkali aggregate reaction is obviously better than that of C type fly ash,and the higher the content of fly ash is,the better the inhibition effect is.Statistical analysis shows that there is a good correlation between the chemical composition of fly ash and its inhibition effectiveness on alkali aggregate reaction.The inhibition effectiveness has a linear positive correlation with the total mass fraction of SiO_(2)+Al_(2)O_(3)+Fe_(2)O_(3),a linear negative correlation with CaO content,and no direct correlation with alkali content.