第41卷第9期2023年9月文章编号:1009-7767(2023)09-0055-05市放技术JournalofMunicipalTechnologyVol.41,No.9Sep.2023D0I:10.19922/j.1009-7767.2023.09.055秸秆灰对UHPC抗压强度和收缩的影响胡金龙(中铁十八局集团第五工程有限公司,天津300450)摘要:传统超高性能混凝土(ultra-highperformanceconcrete,UHPC)生产成本较高,收缩较大,阻碍了UHPC的推广应用。采用农业副产品秸秆灰分别取代硅灰和水泥制备UHPC,研究了其对混凝土抗压强度和收缩的影响。研究结果表明:秸秆灰分别取代20%、40%硅灰和10%水泥增加了UHPC的抗压强度,其中取代20%硅灰抗压强度最高,取代20%水泥则降低了抗压强度;秸秆灰取代水泥或硅灰降低了UHPC的收缩和自收缩,且随着秸秆灰用量的增加而逐渐降低;秸秆灰UHPC的干燥收缩也随着抗压强度的增加而逐渐降低。关键词:秸秆灰;超高性能混凝土;抗压强度;收缩HuJinlong中图分类号:TU528.31EffectofStrawAshonCompressiveStrengthsandShrinkageofUHPC(ChinaRailwayeighteenBureauGroupFifthEngineeringCo.,Ltd.,Tianjin300450,China)Abstract:Becauseofthehighproductioncostandthegreatshrinkage,thefurtherapplicationofthetraditionalultra-highperformanceconcrete(UHPC)hasbeenhindered.Thesilicafumeandcementwasreplacedwithanagriculturalby-productofthestrawashtoprepareUHPC.TheeffectofstrawashoncompressivestrengthsandshrinkageofUHPCwasinvestigated.Theresultsshowthatthereplaces20%and40%silicafumeand10%cementwithstrawashre-spectivelycanimprovethecompressivestrengthsofUHPC.UHPCthatreplacing20%silicafumewithstrawashshowsthehighestcompressivestrengths.However,replacing20%cementwithstrawashreducesthecompressivestrengths;ThereplacingsilicafumeorcementwithstrawashreducestheshrinkageandautogenousshrinkageofUHPC,whichisreducedwiththeincreaseofadditionofstrawash.Withtheincreaseofcompressivestrengths,thedryingshrinkageofUHPCwithstrawashisreduced.Keywords:strawash;ultra-highperformanceconcrete(UHPC);compressivestrength;shrinkage文献标志码:AUHPC因具有超高强度、良好延展性和优异耐久性,被广泛应用于混凝土特殊结构中,是一种新型水泥基材料[1-2]。生产UHPC的原材料通常包括水泥、硅灰、石英砂、石英粉、钢纤维和外加剂等,造价成本较高。其中,硅灰因其颗粒...