文档名：胶结回收沥青混合料地聚物的力学性能研究
摘要：为缓解石油沥青资源匮乏问题,实现废弃回收沥青混合料(reclaimedasphaltpavement,RAP)高效资源化利用,选择粉煤灰、矿渣粉、碱激发剂和其他助剂研发一种新型胶结RAP的地聚物胶结材料(S-FGeopolymer),通过抗压和抗折试验对S-FGeopolymer的基本力学性能和强度形成机理进行研究.结果表明:S-FGeopolymer的最佳配方为m(粉煤灰):m(矿渣粉)=2:1,碱浓度、模数和水胶比分别为0.05、1.2和0.3.在最佳配方下,S-FGeopolymer具有良好的抗压和抗折强度.3d抗压和抗折强度分别为42.33和4.28MPa,7d抗压和抗折强度分别为55.63和5.73MPa,28d抗压和抗折强度分别为72.75和7.42MPa.研究成果可为地聚物材料胶结RAP的理论研究和工程应用提供参考.
Abstract：Thecontinuousimprovementofexpresswaynetworkisofgreatpracticalsignificanceinpromotingtheeconomicandsocialdevelopmentofourcountry.However,themainmaterialforpavingexpresswaypavementisasphaltmixture.Asphaltcementingmaterialandaggregatearenon-renewablematerials.Withthegradualconsumptionofpetroleumasphaltresources,thepriceofasphaltremainshigh.Inordertoachievegreendevelopmentofhighwaysandprotecttheecologicalenvironment,thecostofaggregatesisalsoincreasing.Theincreaseofasphaltandaggregatepriceshasseriouslyaffectedthedevelopmentpatternofexpressways.Inaddition,alargeamountofasphaltpavementmaintenancewillproduceahugeamountofreclaimedasphaltpavement(RAP),whichiscurrentlyappliedtothenewasphaltmixturebyrecycling,buttheutilizationrateofrecycledRAPmaterialsislow.InordertoalleviatetheshortageofpetroleumasphaltresourcesandrealizeefficientutilizationofRAPresources,anewtypeofGeopolymer(S-FGeopolymer)forcementingRAPisdevelopedbyselectingflyash,slagpowder,alkaliactivatorandotherauxiliars.ThebasicmechanicalpropertiesandstrengthformationmechanismofS-FGeopolymerarestudiedthroughcompressiveandflexographictests.Theresultsshowthat:1)Flyash,slagpowder,alkaliactivatorandotherauxiliariesareselectedtodevelopanewtypeofGeopolymercementingRAP(S-FGeopolymer).Theeffectsofdifferentslagpowdercontentandalkaliconcentrationoncompressiveandbendingtestresultsareinvestigation,andthebestformulaisobtainedthatflyash:slagpowder(massfraction)=2:1,alkaliconcentration,modulusandwater-binderratiois0.05,1.2and0.3,respectively.2)ThecontentofslaghasasignificanteffectonthecompressivestrengthofS-FGeopolymer,andthehigherthecontentofslag,thehighertheearlystrength.However,excessiveslagcontentwillcausemicrocracksinS-FGeopolymermaterial,whichwillhaveanegativeimpactontheflexionstrength.Reasonablemaintenancemeasuresshouldbetakentoinhibittheoccurrenceofmicrocracks,suchasfilmcovering.3)TheeffectofalkaliconcentrationoncompressiveandflexionstrengthofS-FGeopolymerliesinthedissolutionrateofactiveSiandAlelementsingellingmaterials,andhasagreatinfluenceontheearlystrengthofslagpowder.However,whenalkaliconcentrationexceedsacertainvalue,thedissolutionofflyashandslagwillbeweakened.Ontheotherhand,thephenomenonof"causticexpansion"willoccurduringthemaintenanceofS-FGeopolymer,whichwilladverselyaffectthemechanicalpropertiesofS-FGeopolymer.TheinfluenceofmodulusonthestrengthofS-FGeopolymermainlycomesfromtheconcentrationofactivesiliconprovidedbythealkalineactivator,whichwillmakethestructureofS-FGeopolymerdenserandstronger.However,aboveacertainvalue,thedissolutionofslagwillbereducedandtheactivesiliconelementswillaccumulate,thusweakeningthemechanicalpropertiesofS-FGeopolymer.TheresearchresultslayafoundationandprovideguidanceforthetheoreticalresearchandfieldengineeringapplicationofgeopolymerincementingRAP.
作者：刘富强 郭伟东 陈二忠 徐子龙 曹天 白雪晴 Author：LIUFuqiang GUOWeidong CHENErzhong XUZilong CAOTian BAIXueqing
作者单位：河北大学建筑工程学院,河北保定071002;长安大学公路学院,西安710064;西安公路研究院有限公司,西安710065河北大学建筑工程学院,河北保定071002杭州科技职业技术学院城市建设学院,杭州311402榆林学院能源工程学院,陕西榆林719000
刊名：重庆理工大学学报 PKU
Journal：JournalofChongqingInstituteofTechnology
年，卷(期)：2024, 38(7)
分类号：U416
关键词：胶结料 回收沥青混合料 地聚物 力学性能 强度机理
Keywords：binder reclaimedasphaltpavement geopolymer mechanicalproperties strengthmechanism
机标分类号：TU502.4U416.26TQ172.44
在线出版日期：2024年6月24日
基金项目：河北省高等学校科学技术研究项目，长安大学中央高校基本科研业务费专项，道路结构与材料交通运输行业重点实验室(长安大学)开放基金项目，河北大学人才引进科研启动项目，省级国有资本经营预算科技创新专项胶结回收沥青混合料地聚物的力学性能研究[
期刊论文] 重庆理工大学学报--2024, 38(7)刘富强 郭伟东 陈二忠 徐子龙 曹天 白雪晴为缓解石油沥青资源匮乏问题,实现废弃回收沥青混合料(reclaimedasphaltpavement,RAP)高效资源化利用,选择粉煤灰、矿渣粉、碱激发剂和其他助剂研发一种新型胶结RAP的地聚物胶结材料(S-FGeopolymer),通过抗压和抗折试验...参考文献和引证文献
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胶结回收沥青混合料地聚物的力学性能研究 Investigation on mechanical properties of geopolymer cementing reclaimed asphalt pavement
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