doi:10.3963/j.issn.1674-6066.2023.05.009广州地铁C50混凝土管片外观气泡及麻面控制技术顾洋(中铁二十二局集团轨道工程有限公司,北京100043)摘要:该文研究了混凝土原材料及配合比对混凝土拌合物性能、力学性能、表面气泡分布及麻面比例的影响规律。结果表明:与水泥品种相比,混凝土外加剂复配措施对混凝土拌合物性能、力学性能和气泡分布与麻面比例的影响更明显,相对而言,在基准外加剂的基础上进一步增加0.1g引气剂及0.1g消泡剂时混凝土表面气泡最少,麻面比例更低。胶凝材料用量、砂率、碎石比例对混凝土表面气泡分布与麻面比例也有不同程度的影响,总体而言,影响程度由大到小为胶凝材料用量>碎石比例>砂率。相对而言,C50混凝土的胶凝材料用量为470kg/m3,砂率为34%,10~25mm与5~10mm碎石搭配比例为8/2时,混凝土表面1cm以上气泡最少,麻面比例最低。关键词:原材料及配合比;拌合物性能;力学性能;气泡数量;麻面比例ControlTechnologyforAppearanceBubblesandPittingSurfaceofC50ConcreteSegmentsinGuangzhouMetroGUYang(ChinaRailway22ndBureauGroupRailEngineeringCo,Ltd,Beijing100043,China)Abstract:Thisarticleinvestigatestheinfluenceofconcreterawmaterialsandproportionontheperformance,me-chanicalproperties,surfacebubbledistribution,andpittingsurfaceratioofconcretemixture.Theresultsshowthatcomparedtocementvarieties,theeffectofconcreteadmixturecompoundingmeasuresontheperformance,mechanicalproperties,bubbledistribution,andratioofpittingsurfaceontheconcretemixtureismoresignificant.Relativelyspeak-ing,whenadding0.1gofairentrainingagentand0.1gofdefoameronthebasisofthereferenceadmixture,theairbub-blesonthesurfaceofconcretearetheleast,andtheproportionoffittingsurfaceislower.Thedosageofcementitiousmaterials,sandratio,andgravelratioalsohavevaryingdegreesofinfluenceonthedistributionofbubblesandthepro-portionofpittingsurfaceontheconcretesurface.Overall,thedegreeofinfluencerangesfromlargetosmallasfollows:cementitiousmaterialdosage>gravelratio>sandratio.Relativelyspeaking,whentheamountofcementitiousmaterialusedinC50concreteis470kg/m3,thesandcontentis34%,andtheratioof10~25mmto5~10mmgravelsis8/2,theairbubblesabove1cmonthesurfaceofconcretearetheleast,andtheproportio...
