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    蘇州混凝土水泥制品研究院有限公司

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    第七期

    輕質自防水混凝土的研究
    輕質自防水混凝土的研究
    • 劉 立,趙順增,李長成,賈福杰
    2015年第7期
    摘要
    引用本文
    摘 要:采用新型雙膨脹源膨脹劑以及不同密度等級、不同類型的輕骨料配制輕質自防水混凝土,并對其工作性、物理力學、變形等性能進行了研究。研究結果表明,輕質自防水混凝土的工作性與輕骨料吸水率、形貌、級配、密度等性質密切相關;相同水膠比下,抗壓強度取決于輕骨料的筒壓強度;輕骨料的吸水特性對膨脹劑有增益作用,在膨脹劑與輕骨料的相互作用下,輕質自防水混凝土限制膨脹率大幅提高,干燥收縮得到明顯抑制。 Abstract: Lightweight self-waterproof concrete (LSWC) was made by double expansion resource expansive agent and lightweight aggregate (LA) of different density degree and type. Workability, physical mechanics, and deformation of LSWC were investigated. The results show that workability of LSWC is closely related to water absorption, shape, gradation, and density of LA. Compressive strength of LSWC depends on cylinder compressive strength of LA when with a fixed water to binder ratio. Water absorption of LA can result in prolonging of expansion rate. In the interrelationship between expansive agent and LA, restrained expansion rate of LSWC grows significantly, and drying shrinkage is obviously inhibited.
    納米SiO2和納米CaCO3改善混凝土抗凍性能試驗
    納米SiO2和納米CaCO3改善混凝土抗凍性能試驗
    • 王德志1,2,孟云芳1,2,李田雨
    2015年第7期
    摘要
    引用本文
    摘??要:研究了納米SiO2和納米CaCO3對混凝土7d、28d和78d抗壓強度、劈裂抗拉強度及混凝土抗凍性能的影響。試驗結果表明,納米SiO2能顯著改善混凝土力學性能和抗凍性能,試驗中最優摻量為2%;納米CaCO3能顯著改善混凝土劈裂抗拉強度和抗凍性能,但對抗壓強度影響不顯著,試驗中最優摻量為3%。Abstract:Theconcretecompressivestrength,splittingstrengthandfrostresistancemixedwithSiO2andCaCO3nanoparticleswereexperimentallystudied.Resultsindicatedthattheaddednano-SiO2improvedmarkedlycompressivestrength,splittingstrengthandfrostresistance,andtheaddednano-CaCO3hadobviousimpactsonsplittingstrengthandfrostresistanceaswellaslittleeffectoncompressivestrength.TheoptimalreplacementlevelsofcementbySiO2andCaCO3nanoparticlesforproducingconcretewere2.0%and3.0%respectively.
    改性超硫酸鹽水泥在大體積混凝土中的應用研究
    改性超硫酸鹽水泥在大體積混凝土中的應用研究
    • 高育欣,王 淑,吳 雄,余保英
    2015年第7期
    摘要
    引用本文
    摘 要:本研究著力于超硫酸鹽水泥在大體積混凝土中的應用,通過研究其物理性能、力學性能,分析在混凝土中應用的可行性;通過測試水化溫升,分析在大體積混凝土中的應用優勢;通過掃描電鏡(SEM)分析水化產物形貌。試驗結果表明,超硫酸鹽水泥混凝土流動性能較好,且其工作性能優于普硅水泥配制的混凝土。對于超硫酸鹽水泥體系的混凝土強度,標準養護條件下稍高于在常溫條件下養護的試塊。隨著齡期增長,混凝土抗壓強度都在增長,且增長速率逐漸降低。超硫酸鹽水泥體系的強度低于普硅水泥體系,但是后期強度增長速率明顯高于普硅水泥體系。超硫酸鹽水泥體系的水化溫升低于普硅水泥。超硫酸鹽水泥體系的主要水化產物為“魚鱗片”狀的水化硅酸鈣和鈣礬石。 Abstract: The use of supersulfated cement (SSC) in mass concrete was studied. The physical properties and mechanical property were tested. Contrasting with the common cement, the temperature rise of hydration and the heat of hydration to obtain the advantage of SCC were analyzed, which could provide the basis for the use of SCC in mass concrete. The micro properties were tested through scanning electron microscope (SEM). The test shows that the SSC shows better working performance than ordinary cement. The compressive strength of SSC under standard curing condition is higher than that under room curing condition. The compressive strength of SSC is increasing with time and the rate of increasing is decreasing. The temperature rise of hydration of SSC is lower than that of ordinary cement. Different with the ordinary cement, the main hydrated products of SSC are ettringite and scaly calcium silicate hydrate.
    偏高嶺土改性混凝土性能研究
    偏高嶺土改性混凝土性能研究
    • 程書凱1,王桂明1,水中和1,梅明軍2
    2015年第7期
    摘要
    引用本文
    摘??要:以偏高嶺土(MK)0~6%等量取代硅酸鹽水泥配制混凝土,研究了MK改性混凝土的抗壓強度、電通量和氯離子擴散系數的變化規律,并通過XRD、TG-DSC對其機理進行分析。試驗結果表明,MK能促進水泥水化進程,提高混凝土的抗壓強度,降低電通量和氯離子擴散系數,混凝土的抗滲性能得到顯著優化,其中摻量為6%時效果最佳。Abstract:Withmetakaolin(MK)substituting0~6%Portlandcementinthepreparationofconcrete,thechangelasofthecompressivestrength,electricfluxandchlorideiondiffusioncoefficientofmodifiedconcretewerestudied.XRD,TG-DSCwereusedtostudythemechanism.TheresultshowthatMKcanpromotehydrationprocessofcementandcaneffectivelyraiseconcretecompressivestrengthandreducetheelectricfluxandchlorideiondiffusioncoefficient,whichsignificantlymakethebetterpenetrationperformanceofconcrete.Theresistancetochlorideionofmodifiedconcretewith6%MKisthebest.
    修復劑對高溫后混凝土修復性能影響的試驗研究
    修復劑對高溫后混凝土修復性能影響的試驗研究
    • 呂云霞,段金躍,李海昆
    2015年第7期
    摘要
    引用本文
    摘??要:為探究修復劑對高溫后混凝土性能的改善作用,通過試驗研究修復劑種類和用量、修復養護時間、修復方式、溫度、混凝土強度等級以及降溫方式等對混凝土抗壓強度、強度修復因子Rf和抗滲修復因子Rc的影響。結果表明,聚氨酯的修復效果最好,硫化硅橡膠的修復效果最差;修復劑用量越多修復效果越好,浸泡法比涂刷法的修復效果好,且浸泡時間越長修復效果越好;隨著溫度的升高,Rf和Rc逐漸增大,當溫度超過700℃時,Rf急劇增長,修復劑對混凝土強度和抗滲性能的改善作用明顯增強;修復劑對C20混凝土的修復效果優于C60混凝土;修復養護時間越長,修復效果越好,自然降溫后的Rf和Rc大于灑水降溫。高溫修復后,裂縫處的Ca(OH)2含量大幅降低,水化硅酸鈣和CaCO3晶體含量相對上升;修復作用使裂縫表面的CaCO3和Ca(OH)2結晶體向C-S-H凝膠轉變。Abstract:Inordertoexploretheroleofrepairagenttoimprovetheperformanceofconcreteafterhightemperature,throughtest,theeffectsofrepairagenttypeandamount,repaircuringtime,repairmode,temperature,concretestrengthandcoolingmethodsonconcretecompressivestrength,repairintensityfactorRf?andimpermeabilityrepairfactorRcarestudied.Theresultsshowthattherepaireffectofpolyurethanewasbest,andtherepaireffectsofsiliconerubberwasworst,themorerepairdosage,thebetterrestoration,andtheimmersionmethodisbetterthanbrushingmethodforrepaireffect,andthelongersoaking,thebetterrepaireffect.Asthetemperatureincreases,Rf?andRc?increasesgradually,andwhenthetemperatureexceeds700℃,Rf?growsrapidly,andtherepairagentcanimprovetheconcretestrengthandimpermeabilitysignificantly.TherepairagentforC20concreteisbetterthanthatofC60concrete,thelongerrepaircuringtime,thebetterrepaireffect,andRf?andRcofnaturalcoolingaremorethanthatofsprinklercooling.Afterthehightemperaturerepair,theCa(OH)2contentatcrackssignificantlyreduced,hydratedcalciumsilicatecrystalsandCaCO3contentincreased,andCaCO3andCa(OH)2crystalsinthecracksurfaceturnedtoC-S-Hgeltransitionwithrepaireffect.
    利用河砂和漂珠制備RPC的試驗研究
    利用河砂和漂珠制備RPC的試驗研究
    • 易曉園
    2015年第7期
    摘要
    引用本文
    摘??要:試驗研究了采用漂珠、河砂(粒徑為0.15~1.18mm)制備活性粉末混凝土(RPC)。結果表明,在水泥∶漂珠∶硅灰∶石英粉∶河砂質量比為0.90∶0.10∶0.25∶0.37∶1.3,水膠比為0.21,減水劑摻量為0.95%,鋼纖維體積摻量為3.0%的條件下,采用蒸汽養護48h,RPC抗壓強度可達156.4MPa,抗折強度可達32.1MPa。微觀分析表明,RPC水化產物結構致密,其主要水化產物為C-S-H凝膠和少量Ca(OH)2。Abstract:Thefeasibilityofthepreparationofreactivepowderconcret(RPC)byfloatingbeadandriversand(particlesize0.15~1.18mm)wasstudied.Theresultsshowedthatwhentheproportionofcement,floatingbead,silicafume,quartzpowder,riversandwas0.90∶0.10∶0.25∶0.37∶1.3,waterbinderratiowas0.21,waterreducingagentwas0.95%,steelfiberwas3.0%andsteamcuring(48h),compressivestrengthofRPCcouldexceed156.4MPa,flexuralstrengthreached32.1MPa.ThemicroanalysisshowedthatthestructureofhydrationproductsofRPCwascompact,andthemainhydrationproductsofRPCwereC-S-HandlittleCa(OH)2
    機制砂在普通混凝土中的應用
    機制砂在普通混凝土中的應用
    • 鄒文裕,韋銀華,陳曉剛
    2015年第7期
    摘要
    引用本文
    摘 要:對機制砂的優缺點以及利用機制砂拌制混凝土可能存在的問題進行了討論,并提出了一些解決方法。希望通過探討,總結機制砂在普通混凝土生產過程中的經驗,合理利用機制砂配制出能滿足實際工程需要的各類混凝土。 Abstract: The advantages and disadvantages of manufactured-sand and the problem of the use of manufactured-sand mixing concrete are discussed and some solutions are put forward. Through beneficial discussion, the experience of the manufactured-sand in use process is summarized, which can help the manufactured-sand of rational utilization to meet the need of the actual project of various kinds of concrete.
    PCCP斷絲數量對內壓承載力的影響
    PCCP斷絲數量對內壓承載力的影響
    • 竇鐵生1,2,胡 赫1,2,楊進新3,夏世法1,2,張 奇3
    2015年第7期
    摘要
    引用本文
    摘 要:采用降溫法模擬PCCP中預應力鋼絲產生的預應力,通過調整降溫值來控制鋼絲中預應力的大小,在沒有斷絲的部位預應力值為一常量。針對0.6MPa和0.8MPa 的工作內壓,直徑2.6m、3.2m和4m的PCCP分別設定不同的斷絲率,通過三維有限元計算,研究了PCCP斷絲數量對內壓承載力的影響。 Abstract:The prestress of prestressed steel wires in PCCP are simulated by cooling method, the prestress is controlled by adjusting the cooling value, and the prestress value of the parts without broken wires is a constant. Under 0.6MPa and 0.8MPa working pressure and different broken wires rate, the relationship between the number of broken wires in PCCP with ?覫2.6m, ?覫3.2m and ?覫4m and the internal pressure bearing capacity is studied by 3D finite element calculation.
    芯模振動工藝生產A型鋼承口管的工法研究
    芯模振動工藝生產A型鋼承口管的工法研究
    • 張陶梅
    2015年第7期
    摘要
    引用本文
    摘 要:針對芯模振動制管工藝特點,以現有的工裝模具為基礎,對比分析了多個生產柔性接頭A型鋼承口管的方案并逐步完善,開發出了組合模具生產A型鋼承口工法,有效解決了芯模振動制管工藝生產柔性接頭A型鋼承口管的難題。 Abstract: According to the characteristics of the core vibrating technology for pipes and based on the existing toolings, a composite mould is developed to make the type-A steel socket by giving full play to the advantages of core vibrating process, contrast analysis of several solutions and gradually improving. The practice shows the mould can effectively solve some problems of pipes with type-A steel socket made using core vibrating technology.
    高鈦重礦渣骨料鋼筋混凝土柱大偏壓試驗研究
    高鈦重礦渣骨料鋼筋混凝土柱大偏壓試驗研究
    • 黃 宏1,2,龍建文1,2,曾仁高1,2
    2015年第7期
    摘要
    引用本文
    摘 要:與普通鋼筋混凝土對比研究了渣砂渣石、渣砂普石和普砂渣石三種高鈦重礦渣鋼筋混凝土試件在三種大偏心率(e0/h=0.32、0.40和0.48)荷載作用下的力學性能,對試件的破壞形態、開裂荷載、極限承載力和最大撓度進行了分析,發現三種高鈦重礦渣鋼筋混凝土柱的大偏壓破壞形態與普通鋼筋混凝土柱相似,普砂渣石高鈦重礦渣鋼筋混凝土試件的強度、剛度優于普通骨料鋼筋混凝土,渣砂渣石和渣砂普石這兩種高鈦重礦渣鋼筋混凝土試件的開裂荷載、極限承載力以及剛度與普通鋼筋混凝土試件接近。此外,在試驗的基礎上采用有限元法對所有試件的極限荷載-撓度曲線進行計算,并將計算與試驗進行對比分析。結果表明,采用有限元法能夠較好地預測三種高鈦重礦渣鋼筋混凝土試件在大偏壓作用下的極限承載能力。 Abstract: The mechanical behaviors of 12 steel reinforced columns with various aggregate types and eccentricities were tested under large eccentric compression loads ( e0/h=0.32, 0.40 and 0.48 ). The failure mode, cracking strength, ultimate strength and deformation of the columns with high titanium heavy slag aggregate are evaluated and compared with those of conventional steel reinforced concrete columns. The test results indicate that the failure pattern of the columns with high titanium heavy slag aggregate is similar to that of conventional concrete columns. The strength and stiffness of the column with coarse aggregate of high titanium heavy slag aggregate gravel and fine aggregate of natural sand are superior to those of conventional concrete columns. The cracking strength, load carrying capacity and stiffness of the columns with totally high titanium heavy slag aggregate or coarse aggregate of natural gravel and fine aggregate of high titanium heavy slag sand are close to those of conventional concrete columns. Based on the test results, the load-deformation curves of all specimens were numerical calculated by finite element method. The simulated results are found to be in good agreement with test data, which indicates that the theoretical model can be used to predict the load-deformation response of the columns with high titanium heavy slag aggregate.
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