AC20改性沥青混合料矿料级配优化研究

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1、第32卷第9期合月巴工业大学学报(自然科学版)Vol.32No.92009年9月JOURNALOFHEFEIUNlVERSITYOFTECHNOLOGYSept.2009AC-20改性沥青混合料矿料级配优化研究陈志忠(安徽省高速公路总公司，安徽合肥230051)摘要:为了提高AC-20改性沥青i昆合料的抗车辙能力，应用Marshall正交试验设计方法，通过方差分析，研究了中面层改性沥青棍合料矿料级配中各筛孔及其不同通过率与不同油石比对马歇尔性能指标的影响，提出了优化的SBS改性沥青AC-20t昆合料工程设计范围。研究结果表明，

2、油石比、0.075mm通过率对空隙率和饱和度影响都是高度显著的;0.075mm、9.5mm、2.36mm筛孔通过率是影响毛体积相对密度和矿料间隙率的主要因素;9.5mm筛孔通过率对马氏各性能指标影响作用较大;室内试验和工程实践证实了采用优化矿料级配具有更好的路用性能，70.C动稳定度接近4000次/mm，可应用于中国高速公路沥青路面中。同时对提高AC型沥青混合料设计水平具有现实意义。关键词:道路工程;AC-20改'性沥青混合料;数学方差分析;正交马歇尔试验设计;马歇尔性能指标;级配优化;路用性能中图分类号:U146.217文献

3、标识码:A文章编号:1003-5060(2009)09-1402-07StudyonoptimizationofaggregategradationdesignforAC-20modifiedasphaltmixtureinpavementCHENZhi-zhongCAnhuiExpresswayHoldingCorporatio口，Hefei230051,China)Abstract:Inordertoimproveanti-rutabilityofAC-20modifiedasphaltmixtureinasphaltpa

4、vementengineering,thispaperinvestigatestheinfluenceofthegradationanddifferentOACofAC-20modifiedasphaltmixtureonMarshallperformancestandardswiththehelpofMarshallorthogonaldesignmethodsandvarianceanalysis,andtheoptimumaggregategradationengineeringdesignofAC-20isputfor

5、ward.Thestudyresultsareasfollows:theOACandO.075mmsievepercentagearemainimpactfactorsofthepercentairvoidsinbituminousmixturesandthepercentofthevoidsinmineralag•gregatefil1edwitheffectiveasphaltinbituminousmixtures,andtheyarehighlysignificant;thepass•ingpercentageofth

6、e0.075mm,9.5mmand2.36mmsievesisthemainfactorthatinfluencesthevoidsinmineralaggregateandthegrossspecimenbulkrelativedensity;andMarshal1performancestandardsaresignificantlyaHectedbythe9.5mmsievepassingrate.Bothindoortestingandengi•neeringpracticeconfirmthattheoptimize

7、dgradationcanproducebetterroadperformancewiththedynamicstabilitybeingnearly4000timespermil1imeterat70.C,andcanbeappliedtohighwayasphaltpavementinChina.Theobtainedresultshavepracticalguidingsignificanceinenhancingthedesignleveloftheasphaltmixture.Keywords:roadenginee

8、ring;AC-20modifiedasphaltmixture;varianceanalysis;Marshal1orthogonaltestdesign;Marshal1performancestandard;gradationoptimization;roadperfo