-91-第46卷第1期非金属矿Vol.46No.12023年1月Non-MetallicMinesJanuary,2023碱激发矿渣/偏高岭土复合材自收缩特性研究李爽1刘青科2肖啸1杜浪1曾睿1彭菁3*李凤英1（1成都产品质量检验研究院有限责任公司，四川成都610101；2重庆大学材料科学与工程学院，重庆400045；3四川省产品质量监督检验检测院，四川成都610101）摘要本试验研究在不同碱当量下碱激发矿渣/偏高岭土复合材（AASM）的自收缩、抗压强度变化规律，并结合内部相对湿度、化学收缩、背散射电子图像及压汞法分析AASM自收缩机理。结果表明，掺入偏高岭土可显著减小基体化学收缩，并通过增加碱激发矿渣体系内部相对湿度、粗化孔径来降低毛细管压力，降低自收缩，有效减少了碱激发矿渣体系的微损伤。此外，碱当量过高会降低AASM自收缩改善程度，当碱当量为6%时，在常温养护可获得抗压强度较高且自收缩小的AASM。关键词自收缩；化学收缩；内部相对湿度；抗压强度中图分类号：TU528.1；X75文献标志码：A文章编号：1000-8098(2023)01-0091-05StudyontheAutogenousShrinkageofMetakaolinModifiedAlkali-ActivatedSlagCementLiShuang1LiuQingke2XiaoXiao1DuLang1ZengRui1PengJing3*LiFengying1(1ChengduInstituteofProductQualityInspectionCo.,Ltd.,Chengdu,Sichuan610101;2CollegeofMaterialsScienceandEngineering,ChongqingUniversity,Chongqing40045;3SichuanInstituteofProductQualitySupervisionandInspection,Chengdu,Sichuan610101)AbstractThisstudyexaminedtheeffectofdifferentactivatorconcentrationontheautogenousshrinkageandcompressivestrengthofalkali-activatedslag-metakaolinmaterials(AASM).AutogenousshrinkagemechanismofAASMwereanalyzedbycombininginternalrelativehumidity,chemicalshrinkage,backscatteredelectronimagesandmercuryintrusionporosimetry.Resultsshowedthatchemicalshrinkageofalkali-activatedslagcementcouldbesignificantlymitigatedbyincorporatingmetakaolin,internalrelativehumiditywasimproved,andporerefinementwasalsomitigatedtoreducethecapillarystress,asaresult,autogenousshrinkageandmicro-cracksofalkali-activatedslagcementwasreducedeffctively.Meanwhile,toohighactivatorconcentrationwasnegativetoautogenousshrinkageofAASM.HighercompressivestrengthandlowerautogenousshrinkageofAASMcouldbeachievedwhenactivatorconce...
