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1、第17卷第1期建筑材料學(xué)報Vol_l7.No.12014年2月JOURNALOFBUILDINGMATERIALSFeb.,2014文章編號:1007—9629(2014)01—0100—06干法橡膠改性瀝青混合料配合比設(shè)計(jì)研究余苗,吳國雄(重慶交通大學(xué)交通土建工程材料國家地方聯(lián)合工程實(shí)驗(yàn)室,重慶400074)摘要:采用“逐級填充”方法進(jìn)行骨架嵌擠密實(shí)型級配設(shè)計(jì),以“等體積替換”為主導(dǎo),用定量膠粉等體積替換對應(yīng)尺寸集料,進(jìn)行干法橡膠改性瀝青混合料配合比設(shè)計(jì)體系的研究.結(jié)果表明:影響干法橡膠改性瀝青混合料抗飛散性能的因素依次為:級配>油石比增量>粗膠粉摻量;對于膠粉體積分?jǐn)?shù)為5.0的干法橡膠改
2、性瀝青混合料,當(dāng)采用SIDG級配,粒徑為4.75~9.5mm的粗膠粉摻量不超過膠粉總質(zhì)量的509/6,且油石比在原級配基礎(chǔ)上增加0.3時,混合料抗飛散性能最佳;當(dāng)膠粉體積分?jǐn)?shù)為3.0時,混合料動穩(wěn)定度有顯著提高,但隨著膠粉體積分?jǐn)?shù)的繼續(xù)增加,動穩(wěn)定度呈下降趨勢.關(guān)鍵詞:廢胎膠粉;干法;瀝青混合料;配合比設(shè)計(jì);等體積替換;肯塔堡飛散試驗(yàn)中圖分類號:U416.21文獻(xiàn)標(biāo)志碼:Adoi:10.3969/j.issn.1007—9629.2014.01.018ResearchontheMixDesignofDryProcessCrumbRubberModifiedAsphaltMixtureyUMi
3、ao,W【,Guoxiong(NationalandRegionalUnitedEngineeringLabforCommunicationsConstructionMaterials,ChongqingJiaotongUniversity,Chongqing400074,China)Abstract:“Fillingingradation’’methodhasbeenadoptedintheskeletoninterlockingdensegradationde—signwith“equi—volumereplacement’’methodastheguidingideaforsolvin
4、gtheproblemofinadequacyofconventionalgradationdesignmethodology’SdirectapplicationinthedesignofdryprocesscrumbrubbermodifiedasDhaItmixture.Theresearchonthemixdesignsystemfordryprocesscrumbrubbermodifiedasphaltmixturewascarriedoutadoptingthemethodofreplacementofequi——volumeaggregateswithquanti——fied
5、crumbrubbers.TheresultsdemonstratethatthegradationhasthemostpredominanteffectonthemasslossinCantabrotestcomparedwiththeasphaltaggregateratio,andthecrumbrubbercontentaffects1eastinthethreefactors.Theresultsindicatethatwiththeskeletoninterlockingdensegradationandnom0rethan50ofthecoarserubber,theaspha
6、ltaggregateratioincreasedby0.3ontopoftheoriginalgradation,thegoodperformanceofthedryprocesscrumbrubbermodifiedasphaltmixturewith5.0rubbercontentbytheaggregateinvolumecanbeachievedinCantabrotest.Inaddition,thedynamicsta—bilitvcanbeimproveddistinctlywhentherubbercontentaccountsfor3.0involume,butthenr
7、educedwiththecontinuousincreaseofrubbercontent.Keywords:wastecrumbrubber;dryprocess;asphaltmixture;mixdesign;equi~volumereplacement;Cantabrotest隨著全球汽車保有量的飛速增加,由此衍生的廢舊輪胎處理問題也面臨著新的機(jī)遇和挑戰(zhàn).廢胎收稿日期:2012—11—01;修訂日期