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1、學(xué)兔兔www.xuetutu.com2013年第2期(總第280期)混凝土預(yù)拌混凝土Number2in2Ol3(TotalNo.280)ConcreteREADYMIXEDC0NCRETEdoi:10.39698.issn.1002-3550.2013.02.025利用礦山尾砂廢石配制C50泵送混凝土的試驗(yàn)研究喻振賢’,李匯,,管品武z,鄭娟榮,楊小龍2(1.中國(guó)十五冶建設(shè)集團(tuán)有限公司,湖北武漢430075;2.鄭州大學(xué)土木工程學(xué)院,河南鄭州450002)摘要:對(duì)利用礦山尾砂廢石配制C50泵送混凝土進(jìn)行了試驗(yàn)研究。研究結(jié)果表明:利用全尾砂細(xì)砂和廢礦石粗細(xì)骨料完全代替天然砂石骨
2、料、礦渣微粉和粉煤灰及緩凝型聚羧酸高效減水劑配制水泥用量為330kg/m3(總膠凝材料用量為472kg/m3)的混凝土拌合物的坍落度達(dá)220rnlTl,其終凝時(shí)間達(dá)20h(適合大體積混凝土連續(xù)施工);7d強(qiáng)度達(dá)到了36MPa,28d強(qiáng)度達(dá)到62IVIPa,各項(xiàng)性能指標(biāo)滿足工程設(shè)計(jì)要求。該項(xiàng)目的技術(shù)特點(diǎn)是通過(guò)試驗(yàn)確定1m,混凝土中骨料最大用量(即骨料空隙率最小)和滿足強(qiáng)度等級(jí)的水膠比,從而確定了總膠凝材料的最小用量,并通過(guò)絕對(duì)體積法計(jì)算出膠凝材料各組成用量及用水量。關(guān)鍵詞:C50泵送混凝土;礦山尾砂廢石骨料;骨料;絕對(duì)體積法中圖分類號(hào):TU528.041文獻(xiàn)標(biāo)志碼:A文章編號(hào):
3、1002—3550(2013)02—0087—04TextstudyofpreparingC50pumpconcretebyusingminetailingsandwasterockYUZhen-xian,LIHui,GUANPin—V~112~ZHENGJuan-rong。。YANGXiao—long(1.FifteenthMetallurgyConstructGroupLimitedCompanyofChina,Wuhan430075,China;2.CollegeofCi~lEngineering,ZhengzhouUniversity,Zhengzhou450002,
4、China)Abstract:ThetextstudyofpreparingC50pumpconcretebyusingminetailingsandwasterockwascarriedon.Theresultsshowedthattheconcretewith330kg/m3cement(thetotalamountofcementitiousmaterialwas472kg/m)andthemixture’Sslumpupto220innlanditsfinalsettingtimeupto20h(suitableformassconcretecontinuouscon
5、struction);and7dand28dcompressives~engthof361V[Paand62Mlaarespectivelywaspreparedbythefinesandinfulltailsandandwasterockaggregatescompletelyreplacingnaturalsandandgravelaggregates、slagpowderandflyashandretardingpolycarboxylatesuperplasticizer,andtheperformanceindicatorsmeetedthedesignre-qui
6、rements,Theproject’Stechnicalfeatureswerethatthemaximumamountofaggregatein1m3concrete(thatporosityinaggregateswasuptominimum)andthewatercementratiomeetingcompressives~engthgradesweredeterminedandtheminimumamountoftotalce—mentitiousmaterialswasdeterminedandtheusageofeachcementitiousmateriala
7、ndwaterconsumptionwerecalculatedbyabsolutevol-umemethod.Keywords:C50pumpconcrete;aggregatemadebyminetailingsandwasterock;aggregate;absolutevolumemethod終凝時(shí)間為18-22h。該工程附加的原材料情況:附近有0引言一座鐵礦山,由于多年的開(kāi)采,已堆積大量的全尾砂;附混凝土是當(dāng)今世界最常用的建筑結(jié)構(gòu)材料,其用量超近還有一個(gè)利用礦山廢石生產(chǎn)混凝土骨料的砂石廠。本過(guò)