建筑资讯建筑技术开发·1·BuildingTechnologyDevelopment第50卷第2期2023年2月BuildingInformation机制砂制备高性能混凝土技术优化研究庞浩然1，王晶1，朱良韬1，杨亚晗2（1.中电建路桥集团有限公司，北京100032；2.北京科技大学土木与资源工程学院，北京100083）［摘要］随着基础设施建设规模不断扩大，天然砂资源逐渐短缺，使用高强度机制砂制备混凝土具有重要意义。对此研究机制砂混凝土的配合比制备方法。结果表明：（1）一定空隙率和细度模数的机制砂能够替代部分天然砂制备C50高性能混凝土；（2）在水胶比为0.32、砂率为45%的条件下，配合比为水泥∶粉煤灰∶机制砂∶碎石∶水∶减水剂=408∶72∶794∶971∶155∶5.76下所制备的机制砂混凝土强度能够达到最高28d高压强度65.9MPa；（3）根据凝灰岩机制砂混凝土配合比优化方案，分析高强度等级混凝土工作性能，确定最优配合比。该方法可为工程施工过程中工作提供依据，具有良好的应用前景。［关键词］机制砂；高性能混凝土；优化制备；配合比［中图分类号］TU74［文献标志码］A［文章编号］1001–523X(2023)02–0001–03STUDYONOPTIMIZATIONOFHIGHPERFORMANCECONCRETEPREPAREDBYMANUFACTUREDSANDPangHao-ran，WangJing，ZhuLiang-tao，YangYa-han［Abstract］Withthecontinuousexpansionofinfrastructureconstructionandthegradualshortageofnaturalsandresources,itisofgreatsignificancetousehigh-strengthmachine-madesandtoprepareconcrete.Thispaperstudiesthemixingratiopreparationmethodofhighperformanceconcretewithmanufacturedsand.Theresultsshowthatasfollowing.(1)ThemanufacturedsandwithacertainporosityandfinenessmoduluscanreplacesomenaturalsandtoprepareC50highperformanceconcrete.(2)Undertheconditionthatthewater-binderratiois0.32andthesandratiois45%,thestrengthofthemanufacturedsandconcretecanreachthehighest28dhighpressurestrengthof65.9MPawhenthemixratioiscement∶flyash∶manufacturedsand∶crushedstone∶water∶waterreducer=408∶72∶794∶971∶155∶5.76.(3)Accordingtothemixproportionoptimizationschemeoftuffmechanismsandconcrete,theworkingperformanceofhigh-gradeconcreteisanalyzedandtheoptimalmixproportionisdetermined.Thismethodcanprovideabasisfortheworkintheprocessofengineeringconstructionandhasagoodapplicationprospect.［...
