摘要
用粉煤灰等质量替代20%,30%,50%水泥后,将水泥-石灰石粉-粉煤灰净浆样品置于(5±2)℃的10%(质量分数)硫酸镁溶液中15个月,加速碳硫硅钙石型硫酸盐侵蚀(TSA).对腐蚀产物进行了红外光谱定性分析和X射线衍射定量分析,通过灰色关联分析研究了粉煤灰对TSA的影响.结果表明:粉煤灰对水泥基材料的TSA影响与其组成、掺量及细度等因素有关;粉煤灰活性指数对碳硫硅钙石形成影响最大,可作为筛选粉煤灰预防TSA破坏的指标;活性指数大于80%的粉煤灰,其掺量达到50%时可显著改善水泥基材料的抗TSA性能.
Cement was equally replaced by fly ash with 20%, 30% and 50% proportions, Cement-limestone-fly ash paste samples were immerged in 10% magnesium sulfate solution（by mass） at （5±2） ℃ for 15 months to accelerate thaumasite form of sulfate attack（TSA）. The corrosion products were qualitatively analyzed by infrared spectrum（IR） and quantitatively analyzed by X-ray diffraction（XRD）/Rietveld refinement methods. The effect index of fly ash on TSA was investigated by gray correlation analysis. The results show that.effects of fly ash on TSA are closely related to the composition, content of fly ash. The activity index of fly ash has a maximum gray correlation degree to quantity of thuamasite formation which could be used as an index for filtering fly ash to prevent TSA. Fly ash with an activity index 〉80% could improve the resistance to TSA in cement-based materials when the content reached 50%.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2014年第4期685-689,共5页
Journal of Building Materials
基金
国家重点基础研究发展计划(973计划)项目(2009CB623106)
关键词
碳硫硅钙石型硫酸盐侵蚀
粉煤灰
灰色关联分析
化学组成
掺量
thaumasite formation of sulfate attack（TSA）
fly ash
gray correlation analysis
chemical composition
content
