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    蘇州混凝土水泥制品研究院有限公司

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    第二期

    高強混凝土收縮尺寸效應及預測模式修正方法
    高強混凝土收縮尺寸效應及預測模式修正方法
    • 錢春香,王 輝,何智海
    2012年第2期
    摘要
    引用本文
    摘 要:為了將實驗室標準條件下測量的數據更好地用于實際橋梁建設和維護中,本文研究了環境相對濕度和試件尺寸對混凝土收縮的影響。研究結果表明,試件的尺寸不僅影響干燥收縮的進程,對干燥收縮終值也有很大的影響,尺寸越小,混凝土干燥收縮越大,混凝土的尺寸效應隨著濕度降低而增加。結合CEB-FIP1978,根據試驗結果修正了CEB-FIP1990收縮模式,修正后的模型計算結果與試驗值的比較表明,按照本文的處理方法可以提高模型預測精度,為將實驗室預測結果較好地推廣到實際結構收縮的預測中提供了一種修正方法。 Abstract: In order to apply the data from laboratory to the structure shrinkage prediction in field, the effects of environment relative humidity and specimen size on concrete shrinkage are studied. The results show that the specimen size not only affects the progress of shrinkage but also the final shrinkage strain. Drying shrinkage increases with smaller specimen size. The size effect is more prominently when the environment relative humidity is lower. Combining with CEB-FIP1978, the CEB-FIP1990 model is improved based on the experiment result, and the calculation value is compared with experiment value. The prediction accuracy is improved remarkably by the improved model, which provides a modified method for the laboratory prediction into practical structure shrinkage prediction.
    木質素、聚羧酸及其復配型和共聚型減水劑性能比較研究
    木質素、聚羧酸及其復配型和共聚型減水劑性能比較研究
    • 雷永林,王萬林,霍冀川
    2012年第2期
    摘要
    引用本文
    摘 要:將共聚型木質素-聚羧酸系高效減水劑、未聚合木質素磺酸鈣的聚羧酸系高效減水劑、木質素磺酸鈣和復配型木質素-聚羧酸系高效減水劑的性能進行比較,探討了四種不同減水劑對水泥水化的影響。結果表明:共聚型木質素磺酸鈣-聚羧酸系高效減水劑可以使木鈣中含有使水泥凈漿產生閃凝現象的雜質得以減少或消除,使聚羧酸系高效減水劑的保水性提高,且成本遠低于聚羧酸系高效減水劑。復配型木質素磺酸鈣-聚羧酸系高效減水劑隨摻量增加,水泥凈漿強度下降,產生負面疊加效果,共聚型木質素磺酸鈣-聚羧酸系高效減水劑隨摻量增加,水泥凈漿強度提高,改善了木鈣造成水泥凈漿強度降低的缺陷。共聚型的木質素磺酸鈣-聚羧酸系高效減水劑相對于復配型對硅酸三鈣水化有一定的促進作用。 Abstract:The properties of copolymer lignin-polycarboxylate superplasticizer, polycarboxylate superplasticizer, calcium lingosulphonate and compound lignin-polycarboxylate superplasticizer are compared. The influences of four kinds of water reducers on hydration of cement are discussed. The results show that the copolymer lignin-polycarboxylate superplasticizer could reduce or eliminate the impurities of calcium lignosulphonate which will cause the cement paste flash condensate. The water retention of polycarboxylate superplasticizer is improved, and the cost of copolymer lignin-polycarboxylate superplasticizer is far less than polycarboxylate superplasticizer. With the dosage of compound lignin-polycarboxylate superplasticizer increasing, the compressive strength of net cement slurry is decreased, and moreover, the negative superimposed effects will carry out. With the dosage of copolymer lignin-polycarboxylate superplasticizer increasing, the compressive strength of net cement slurry is increased, and the defects of calcium lignosulphonate that cause the compressive strength of net cement slurry reduced is improved. Compared to compound lignin-polycarboxylate superplasticizer, the copolymer lignin-polycarboxylate superplasticizer can promote the hydration of C3S.
    海砂混凝土耐久性能研究
    海砂混凝土耐久性能研究
    • 卞立波,宋少民,李 飛
    2012年第2期
    摘要
    引用本文
    摘??要:通過海砂混凝土不同條件下力學性能和耐久性的測試,對海砂高強混凝土中的鋼筋銹蝕能力進行了研究。結果表明,海砂中氯離子含量在0.123%、在混凝土中使用量低于320kg/m3的條件下,對強度高于50MPa的混凝土立方體抗壓強度、碳化性能、抗氯離子擴散性能影響不大;海砂混凝土的鋼筋銹蝕失重率隨著海砂摻量的增加和水膠比的增大而增加;阻銹劑的摻入和保護層厚度的增加,可使海砂混凝土的抗鋼筋銹蝕能力有所改善,鋼筋銹蝕程度有所下降。Abstract:Throughtestingthemechanicalpropertiesanddurabilityoftheconcretewithseasandunderdifferentconditions,thesteelcorrosionofthehighstrengthconcretewithseasandisstudied.Theresultsshowthatithasalittleeffectontheconcretecubecompressivestrength,anti-carbonationpropertiesandresistancetochloridediffusionpropertieswhenthecontentofchlorideionislessthan0.123%andthedosageofseasandislessthan320kg/m3.Thesteelcorrosionbecomeslargerastheseasandandthewater-binderincrease.ThesteelcorrosioncanbeimprovedwhentheMCI-2006rustyretardantagentisusedandtheprotectivelayerthicknessincreases.
    硫酸鹽相容型聚羧酸減水劑的吸附-分散機理
    硫酸鹽相容型聚羧酸減水劑的吸附-分散機理
    • 周 文
    2012年第2期
    摘要
    引用本文
    摘 要:利用等溫吸附、XRD、DTA和化學分析研究了硫酸鹽相容型聚羧酸減水劑(PCA)與水泥顆粒之間的相互作用機理。結果表明,聚羧酸減水劑能加速水泥水化初期鈣礬石(AFt)和單硫型水化硫鋁酸鈣(AFm)的形成,并且當水泥中存在石灰石微粉時,還可加速早期單碳型水化硫鋁酸鈣的形成,從而降低了水泥顆粒對PCA的吸附。由于建立了靜電斥力與空間位阻作用協同作用機制,PCA在獲得高分散性的同時,使混凝土具有優異的坍落度經時保持性能。硫酸鹽相容型聚羧酸減水劑與萘系高效減水劑相容,可共同使用。 Abstract: Action mechanism between sulfate compatible polycarboxylate type additive (PCA) and cement particles is investigated by isothermal adsorption measurement, XRD analysis, derivative thermogravimetric (DTG) analysis and chemical analysis. Experimental results indicate that more ettringite (AFt) and calcium monosulfoaluminate (AFm) formed, and calcium monocarboaluminate formed when CaCO3 presented in hydration system with PCA, even at initial period of hydration, which resulted in a lower adsorption amount of PCA adsorbed by cement particles. The improved dispersibility and fluidity retention of concrete are the result of a combination action mechanism of electrostatic repulsion cooperating with steric hindrance. The sulfate compatible PCA may be combined with PNS to make the novel combined superplasticizer.
     RPC活性粉末混凝土工廠化生產制備過程中的影響因素分析
    RPC活性粉末混凝土工廠化生產制備過程中的影響因素分析
    • 黨智斌
    2012年第2期
    摘要
    引用本文
    摘 要:活性粉末混凝土(RPC)是超細粒聚密材料與纖維增強材料經高溫熱合等特定工藝制備的一種新型超高性能混凝土,因其高抗壓、高抗折、高耐久性及良好的體積穩定性等優良性能,已經進入實際工程應用階段。本文通過對鐵路客專RPC電纜槽蓋板制備過程中材料強度的總結分析,歸納出工廠化生產制備過程中影響活性粉末混凝土(RPC)材料性能的幾個主要因素 Abstract: Reactive powder concrete (RPC) is a new kind of ultra-high performance concrete, which is prepared by ultra-fine poly-dense material and fiber reinforced material through high temperature and heat-conglutinating process. Because of its high compressive strength, flexural strength, durability and good volume stability, RPC is entering the practical engineering application stage. In this paper, based on the summary of the material strength in the production process of railway passenger special RPC cable gutter plank plate, the main factors effecting the RPC properties are concluded in the factory producing process.
    芯模振動制管工藝與徑向擠壓制管工藝對比分析
    芯模振動制管工藝與徑向擠壓制管工藝對比分析
    • 褚建中,王世民
    2012年第2期
    摘要
    引用本文
    摘 要:介紹了芯模振動制管工藝及徑向擠壓制管工藝的原理及優缺點,通過對兩種制管工藝的原材料與技術經濟指標等進行對比分析,指出了芯模振動制管工藝具有成本低、管子質量好、制管種類多等優點,但其表面光潔度不如徑向擠壓制管工藝。此外,對兩種制管工藝制管時產生裂縫的原因、模具要求、芯模振動制管工藝的振動頻率等問題進行了探討,并提出各企業應根據自身情況及工藝特點選擇合適的制管工藝。 Abstract:The principle, advantages and disadvantages of core vibrated casting process and radial extruding process are introduced. And raw materials, technical and economic indexes of the two processes are contrasted and analyzed in detail, which indicate that there are many advantages about core vibrated casting process such as lower cost, making many kinds of pipes with good quality, but surface finish of pipes manufactured by this method is worse than that of pipes manufactured by radial extruding process. Meanwhile, the cause of cracks, mould requirements and vibration frequency of core vibrated casting process during manufacturing pipes using the two processes are discussed. In addition, it also points out that enterprises should choose the appropriate process according their own situation and process characteristics
    大口徑PCCP城市"綜合管廊"的應用前景和工程實例介紹
    大口徑PCCP城市"綜合管廊"的應用前景和工程實例介紹
    • 張 亮,余洪方
    2012年第2期
    摘要
    引用本文
    摘 要:國內現有城市道路地下管線布置模式給城市交通、城市環境、城市景觀和土地利用造成不同程度的影響,城市道路地下管線“綜合管廊”的出現,以其獨特的優勢成為眾多城市地下管線建設的選擇之一。本文對大口徑PCCP用作城市地下管線“綜合管廊”應用前景進行了分析,并對天津某工程成功采用DN3000大口徑PCCP作為城市“綜合管廊”管線材料工程實例進行了介紹。工程應用實例表明,大口徑PCCP為城市“綜合管廊”工程提供了一種性能優異的管線材料,不僅能有效降低工程造價、而且能縮短施工周期,應用前景廣闊。 Abstract:The present underground pipeline mode for urban road has different degree impacts on the urban traffic, urban environment, urban scenery and land use in China, and aiming at the problems,“utility tunnel”with its unique advantages becomes one of good options in pipeline construction for many cities. In this paper, application prospect of PCCP with large diameter as a material of urban “utility tunnel” is analyzed, and an engineering example for DN3000 PCCP with large diameter as a material of urban“utility tunnel” is introduced, which indicates that PCCP with large diameter as a great pipe material of “utility tunnel” not only can reduce construction costs but also can shorten construction period and has great application prospects.
    鋼筋纖維混凝土管的研究及推廣應用
    鋼筋纖維混凝土管的研究及推廣應用
    • 趙湘暉
    2012年第2期
    摘要
    引用本文
    摘 要:對比鋼筋纖維混凝土管、預應力鋼筒混凝土管和鋼筋混凝土管的性能和應用現狀,指出鋼筋纖維混凝土管具有較高的性價比和較大的潛在應用市場。并對懸輥法制管工藝進行了創新,制備了性能較好的.大口徑鋼筋纖維混凝土管。 Abstract:By comparing with the performance and present status of application of reinforced fiber concrete pipe,prestressed cylinder concrete pipe and reinforced concrete pipe, it points out reinforced fiber concrete pipe as a more cost-effective product will have a large range of application. By innovating the process for producing pipe with suspension roller,high performance reinforced fiber concrete pipes with large diameters are prepared
    聚丙烯纖維對犧牲混凝土強度及早期抗裂性能的影響
    聚丙烯纖維對犧牲混凝土強度及早期抗裂性能的影響
    • 曹元超,金祖權,張巧芬
    2012年第2期
    摘要
    引用本文
    摘??要:研究了膠凝材料用量為400kg/m3和450kg/m3,聚丙烯纖維摻量為0,1.0kg/m3和1.5kg/m3的犧牲混凝土抗壓強度及早期抗裂性能。試驗結果表明,聚丙烯纖維對犧牲混凝土增強效果不明顯,當犧牲混凝土中聚丙烯纖維摻量達到1.0kg/m3,混凝土的最大裂縫寬度下降了0.15mm,當犧牲混凝土中聚丙烯纖維摻量達到1.5kg/m3,可以顯著提高犧牲混凝土的早期抗裂性能。Abstract:Evaluationsofthecompressivestrengthandearlyagecrackresistancecapacityforpolypropylenefiberreinforcedsacrificialconcreteareconducted,whilethecementitiousmaterialofsacrificialconcreteis400kg/m3and450kg/m3,thepolypropylenefibercontentis0,1.0kg/m3and1.5kg/m3,respectively.Theexperimentalresultsshowthattheinfluenceofpolypropylenefirercontentoncompressivestrengthofconcreteisunconspicuous.Whensacrificialconcretepavementswith1.0kg/m3polypropylenefiber,thelargestcrackwidthdecreasesabout1.5mmcomparedwiththeordinarysacrificialconcrete.Andwhenthepolypropylenefiberdosageisupto1.5kg/m3,itcansignificantlyimprovetheearlyagecrackresistancecapacityofsacrificialconcrete.
    磷酸鹽修補材料粘結強度影響因素研究
    磷酸鹽修補材料粘結強度影響因素研究
    • 唐春平
    2012年第2期
    摘要
    引用本文
    摘 要:研究了養護條件、界面處理、舊混凝土表面不同濕態及基材種類等因素對磷酸鹽修補材料粘結強度的影響。試驗結果表明,養護條件對粘結強度有較大的影響,室溫養護下強度高,水養護不利于強度的發展。界面處理對粘結強度有很大的影響,粘結面鑿毛有利于提高粘結強度?;臑榱姿猁}修補材料的粘結強度要明顯高于基材為混凝土的粘結強度。 Abstract:The influence of curing condition, surface treatment, moist on concrete surface and base material on bonding flexure strength of phosphate repairing material are studied. Experimental results show that curing condition has great influence on the bonding flexure strength, under curing in air condition the bonding flexure strength is higher and under water curing condition, bonding flexure strength is lower. Surface treatment has a major influence on the bonding flexure strength, the bonding strength of interface can be increased by cutting hair. The bonding flexure strength of base material with phosphate is higher than that with old concrete, and the difference is markedly significant.
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