摘要
为了全面反映粉煤灰化学、物理特性对其抑制混凝土碱硅反应(ASR)效果的影响,采用60℃快速混凝土棱柱体法考察了10种粉煤灰对ASR的抑制效果,采用XRD多相Rietveld定量分析方法测试粉煤灰的矿物组成,采用激光粒形粒度分析仪测试粉煤灰的比表面积和平均粒径,同时测试粉煤灰45μm筛余,然后分别用粉煤灰非晶态SiO2含量、非晶态Al2O3含量、45μm筛余、平均粒径以及比表面积对其化学成分因子进行修正,得到粉煤灰的物理化学因子,并用文献数据对之进行了验证.结果表明,用粉煤灰中非晶态SiO2或非晶态Al2O3含量分别取代SiO2或Al2O3总量均不能改善ASR抑制率与化学成分因子之间的相关性;细度与化学成分组合而成的物化因子可以较全面地反映粉煤灰抑制ASR的能力.
Chemical index of the fly ash quality can be used to show the effectiveness of fly ash on alkali-silica reaction（ASR） of concrete.The effect of 10 type of fly ashes on ASR were tested by 60 ℃ accele-rated concrete prism test method to show the influence of chemical,mineral and physical properties of fly ash.Measuring the mineral compositions by Rietveld-based quantitative XRD,the specific surface area and ave-rage diameter by laser based particle size and shape analyzer,physical-c hemical index was established by adjusting the chemical index with amorphous SiO_2 content,amorphous Al_2O_3 content,45 μm sieve residue,average d iameter,and specific surface area respectively.The results show that using amo rphous SiO_2 content or amorphous Al_2O_3 content instead of total SiO_2 content or total Al_2O_3 content does not improve the correlation of ASR suppressing ratio and the above-mentioned chemical index.Physical-chemical index made from chemical compositions and fineness is satisfactory for the evaluation of the suppressing ability of fly ash on ASR.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2010年第4期424-429,共6页
Journal of Building Materials
基金
国家自然科学基金委员会
二滩水电开发有限责任公司雅砻江水电开发联合研究基金资助项目(50539040)
水利部公益性行业科研专项经费资助项目(200801057)
关键词
粉煤灰
碱硅反应
矿物组成
细度
Rietveld定量分析方法
颗粒粒径分布
化学成分因子
物化因子
fly ash
alkali-silic a reaction
mineral composition
fineness
Rietveld-based quantitative ana-lysis
particle size distribution
chemical index
physical-chemical index
