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1、學(xué)兔兔www.xuetutu.com2014年第3期(總第293期)混凝土原材料及輔助物料Number3in2014(Tota1No.293)ConcreteMATERIALANDADMINlCLEdoi:10.396%.issn.1002—3550.2014.03.030風(fēng)化砂取代細(xì)骨料對(duì)混凝土強(qiáng)度的影響研究楊俊a,b。童磊la,b,張國(guó)棟la,b,唐云偉。,陳紅萍。(1.三峽大學(xué)a.三峽地區(qū)地質(zhì)災(zāi)害與生態(tài)環(huán)境湖北省協(xié)同創(chuàng)新中心;b.土木與建筑學(xué)院,湖北宜昌443002;2.宜昌市交通運(yùn)輸局,湖北宜昌4430
2、02;3.宜昌市公路管理局,湖北宜昌443002)摘要:針對(duì)目前工程中對(duì)風(fēng)化砂利用率較低的問(wèn)題,研究了風(fēng)化砂作為混凝土細(xì)骨料的可行性,通過(guò)不同養(yǎng)護(hù)齡期下的混凝土抗折、抗壓試驗(yàn),深入分析了風(fēng)化砂混凝土抗壓、抗折強(qiáng)度隨齡期的增長(zhǎng)規(guī)律。研究表明:風(fēng)化砂混凝土具有較好的和易性,便于水泥混凝土路面施工現(xiàn)場(chǎng)滑膜攤鋪機(jī)具的攤鋪?zhàn)鳂I(yè);風(fēng)化砂取代細(xì)骨料可以顯著提高混凝土早期抗壓與抗折強(qiáng)度,3、7d的抗壓、抗折強(qiáng)度均大于同等養(yǎng)護(hù)條件下普通混凝土的強(qiáng)度值;風(fēng)化砂混凝土的后期抗壓、抗折強(qiáng)度的增長(zhǎng)速度較慢,28d抗壓強(qiáng)度僅達(dá)到了設(shè)計(jì)強(qiáng)度
3、的89.2%,抗折強(qiáng)度較普通混凝土略低,達(dá)到了設(shè)計(jì)強(qiáng)度的96.81%,滿(mǎn)足規(guī)范中對(duì)于輕交通混凝土路面的抗折要求。關(guān)鍵詞:風(fēng)化砂;混凝土;細(xì)骨料;抗壓強(qiáng)度;抗折強(qiáng)度中圖分類(lèi)號(hào):TU528.041文獻(xiàn)標(biāo)志碼:A文章編號(hào):1002—3550(2014)03—0109—04ResearchofefectonconcretestrengthforweatheredsandreplacingfineaggregateYANGJtmla,b,TONGLeila,bZHANGGuodong.v,TANGYunwei.CHENH
4、ongping(1a.CollaborativeInnovationCenterofGeologicalHazardsandEcologicalEnvironmentinThreeGorgesAreainHubeiProvince;b.CivilandArchitecturalInstitute,ChinaThreeGorgesUniversity,Yichang443002,China;2.YichangTransportBureau,Yichang443002,China;3.YichangHighwayA
5、dministration,Yichang443002,China)Abstract:Inviewoftheproblemoflowutilizationofweatheredsandincurrentprojects,itstudiesreplacingweatheredsandasfineaggre—gateconcretefeasibility,andunderdifferentcuringperiodthroughflexural,compressivetests,analyzesthegrowthru
6、leofweatheredsandconcreteScompressiveandflexur~strengthincreasingwithages.Studiesshowedthat:weatheredsandconcretehasgoodworkability,easeformachine’Spavingoperationsduringpavementconstructionofcementconcrete;Inreplaceoffineaggregate,theweatheredsandCansig—nif
7、icantlyimproveearlycompressivestrengthofconcreteandflexuralsuength,3,7dcompressiveandflexuralstrengthwerehigherthanor·dinaryconcretestrengthvaluesunderthesamecuringconditions;thelatercompressiveandflexuralstrengthofweatheredsandconcr~ein—creasesslower,28dcom
8、pressives~engthreachedonly89.2%ofthedesigns~ength,flexuralstrengthisslightlylowerthanordinarycon—crete,upto96.81%ofthedesignstrength,meetsthespecificationsforconcretepavement’Sbendingrequirement