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    蘇州混凝土水泥制品研究院有限公司

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    2011

    用化學方法制備泡沫混凝土的試驗研究
    用化學方法制備泡沫混凝土的試驗研究
    • 徐 文1,錢冠龍2,化子龍2
    2011年第12期
    摘要
    引用本文
    摘 要:通過化學方法制備輕質泡沫混凝土,分析了其結構形成機理,研究了發泡劑、激發劑、穩泡劑、料漿稠度與凝結時間及工藝條件等因素對性能的影響。通過優化選擇,得到了性能優良的泡沫混凝土。 Abstract: Chemical method is used to prepare foam concrete and the structure formation mechanism is analyzed. The influences of foaming agent, activator, foam stabilizer, slurry consistency, setting time and process conditions on properties of foam concrete are studied. Through optimal selections, the foam concrete with good performances are obtained.
    人工砂商品混凝土配合比的試驗研究
    人工砂商品混凝土配合比的試驗研究
    • 韓靜云1,王春明2,宋旭艷1
    2011年第12期
    摘要
    引用本文
    摘 要:采用70%人工砂與天然細砂混合改善砂級配,可替代天然中砂配制商品混凝土,所配制出的混凝土抗壓強度高于天然中砂混凝土。正交試驗法設計摻合料人工砂混凝土的配合比,試配結果表明,人工砂占混合砂70%,粉煤灰、礦粉摻量分別為20%、25%,砂率為45%時,在拌合料中加入YS-2B萘系減水劑1.7%,可解決人工砂混凝土需水量大的問題,新拌混凝土坍落度達到180mm的泵送要求;28d抗壓強度為32.4MPa,滿足C30混凝土的設計強度,60d抗壓強度為37.0MPa,人工砂替代天然砂不影響混凝土后期的抗壓強度。 Abstract: Mixed sand with 70% artificial sand and natural sand can be utilized to improve sand gradation, which can replace natural medium sand to prepare ready-mixed concrete, and the concrete compressive strength may be higher than that with natural medium sand. Based on orthogonal experimental method, the mix proportion of admixture concrete with artificial sand can be designed. The results indicate that when mixed sand containing 70% artificial sand, with 20% fly ash and 25% slag, under the sand ratio of 45%, adding 1.7% YS-2B naphthalene superplasticizer into concrete mixture, the great water demand for concrete with artificial sand can be solved and the slump value of fresh concrete can reach 180mm, which can satisfy the pumping concrete requirement. The 28d compressive strength of concrete is 32.4MPa, which can meet the design strength of C30 concrete, and the 60d compressive strength is 37.0MPa. Artificial sand replacing natural sand may have no effect on late compressive strength of concrete.
    粉煤灰和礦粉對水泥基鋼渣細集料砂漿體積穩定性的影響研究
    粉煤灰和礦粉對水泥基鋼渣細集料砂漿體積穩定性的影響研究
    • 倫云霞1,劉紹舜2,周明凱3
    2011年第11期
    摘要
    引用本文
    摘 要:針對水泥混凝土用鋼渣細集料體積安定性不良的問題,研究了粉煤灰和礦粉對鋼渣細集料砂漿(SSM)體積穩定性的改善規律和作用機理。借助砂漿棒法,研究了粉煤灰和礦粉按不同摻量(0%、20%、40%和60%)替代水泥對鋼渣細集料砂漿體積穩定性的影響。結果表明:80℃水熱加速養護制度下,摻加礦粉和粉煤灰均延長了鋼渣細集料砂漿的穩定齡期,推遲了其開裂齡期;以膨脹率大小為依據,粉煤灰和礦粉的最佳摻量均為40%;在標準養護至540d齡期時,摻加粉煤灰和礦粉的砂漿線性膨脹率與空白組的變化規律相近??拐蹚姸群蚐EM的研究表明:在水熱加速養護制度下,粉煤灰和礦粉對鋼渣細集料砂漿體積穩定性的改善主要是通過提高強度以增加砂漿對膨脹力的約束、增加砂漿密實性延緩水分滲入而獲得的。因此,在水熱養護制度下,摻加粉煤灰和礦粉能改善鋼渣細集料砂漿的體積穩定性,但不能從根本上遏制鋼渣細集料膨脹組分的水化;在標準養護制度下,粉煤灰和礦粉的改善效果不明顯。 Abstract:Aiming at the volume unsoundness of steel slag sand used in cemented concrete, the improving regularity and mechanism of action on volume stability of steel slag sand mortar (SSM) containing fly ash(FA) and ground granulation blast furnace slag (GGBFS) are investigated. The effects of FA and GGBFS with different dosages(0%, 20%,40% and 60%) on volume stability of steel slag sand mortar are studied. The results show that adding FA and GGBFS can extend the stable age and delay the cracking age of SSM under 80℃ hot water curing. The best dosages of FA and GGBFS are both 40% according to the expansion rate. The linear expansion rate of SSM with FA and GGBFS is the same as the blank sample under the standard curing to 540 days. The results of flexural strength and SEM demonstrate that under the hot water curing, the improving effect of FA and GGBFS on volume stability of SSM is gained by increasing of strength and compactness which can reinforce the restraining force against expansion of SSM and prevent the water penetration. It is concluded that although adding FA and GGBFS can enhance the volume stability of SSM under hot water curing condition, they can’t prevent the hydration of expansion components of steel slag sand radically. The improving effect of FA and GGBFS isn’t obvious under standard curing condition.
    礦渣、沸石粉復合摻合料在混凝土中的試驗研究
    礦渣、沸石粉復合摻合料在混凝土中的試驗研究
    • 明 陽1,陳 平1 ,2,李 玲3,郭一鋒1
    2011年第12期
    摘要
    引用本文
    摘??要:通過正交試驗,研究了用水量、砂率、沸石摻量、礦渣摻量、沸石比表面積5因素對礦渣-沸石混凝土工作性能、抗壓強度和氯離子滲透性的影響。綜合考慮各因素對三指標的影響,得出制備C40混凝土的適宜配合比為:水量160kg/m3,砂率40%,礦渣摻量30%,沸石摻量15%,沸石比表面積530m2/kg。通過掃描電子顯微鏡SEM對混凝土微觀結構和水化產物形貌進行了簡要分析。Abstract:Byusingtheorthogonaltest,theinfluencesofthewaterconsumption,sandratio,dosageofzeoliteandslagandspecificsurfaceareaofzeoliteontheworkability,compressivestrengthandchlorideionpenetrationoftheslag-zeoliteconcretearestudied.TheresultsshowthatthesuitablemixproportionofC40slag-zeoliteconcreteisthat:thewaterconsumptionis160kg/m3,thesandratiois40%,thedosageofslagis30%,thedosageofzeoliteis15%,andthespecificsurfaceareaofzeoliteis530m2/kg.Themicrostructureofconcreteandmorphologyofhydrationproductsareanalyzedbyscanningelectronmicroscopy.
    改性萘系減水劑對水泥基材料性能的影響
    改性萘系減水劑對水泥基材料性能的影響
    • 趙 平,嚴 云,胡志華,王田堂
    2011年第11期
    摘要
    引用本文
    摘??要:用經氧化醚化等改性制得的氧化醚化淀粉(OES)與萘系減水劑復配改性,研究了改性萘系減水劑對水泥基材料性能的影響。結果表明,改性萘系減水劑能有效改善萘系減水劑的保坍行為,使水泥漿體保持較長的塑化時間,水泥水化誘導期明顯延長;摻13%改性萘系減水劑的水泥漿體2h坍落度損失僅為6%,遠小于摻萘系減水劑的56%;與摻萘系減水劑的水泥漿體相比,當改性萘系減水劑中OES含量為5%~13%時,水泥凈漿流動度2h損失減小了17%~89%,28d水泥膠砂強度則相應提高了12%~20%。Abstract:Throughthecomplexformulationandmodificationbetweenthenaphthalenesulphonatesuperplasticizerandoxidativeetherifiedstarch(OES)preparedbytheoxidationandetherificationtreatment,theeffectsofthemodifiednaphthalenesulphonatesuperplasticizerontheperformancesofcementitiousmaterialsarestudied.Theresultsindicatethatthemodifiednaphthalenesulphonatesuperplasticizercanobviouslyimprovetheslumpretainingofnaphthalenesulphonatesuperplasticizer,theflowabilityofcementpasteiseffectivelyimprovedcomparedtoordinarynaphthalenesulphonatesuperplasticizerandthehydrationinductionperiodcanbeprolongedobviously.Theslumplossofcementpastewith13%modifiednaphthalenesulphonatesuperplasticizerisonly6%after2hourswhichismuchlowerthanthatoftheordinarynaphthalenesulphonatesuperplasticizer.Incomparisonwithcementpasteaddedwithnaphthalenesulphonatesuperplasticizer,whenthecontentofOESis5%~13%,theflowabilitylossofcementpasteafter2hoursreducesby17%~89%,and28dcompressivestrengthisraisedby12%~20%.
    混凝土滲透結晶材料在水工噴射混凝土中的應用
    混凝土滲透結晶材料在水工噴射混凝土中的應用
    • 劉 玲1,王可良2,鄭燦堂2
    2011年第12期
    摘要
    引用本文
    摘 要:為研究滲透結晶材料對噴射混凝土性能的影響,采用抗滲和抗凍試驗方法,結合掃描電子顯微(SEM)和壓汞法(MIP)對混凝土的微觀結構進行分析和表征。結果表明,滲透結晶材料可提高噴射混凝土的抗滲和抗凍性能,通過改善混凝土界面過渡區和水泥石的微觀結構,改善混凝土的孔徑分布,使少害孔含量增多,多害孔含量減少,最可幾孔徑減小,混凝土貫通能力減弱,抗滲和抗凍性能提高。 Abstract: In order to study the influences of permeated crystalline materials on performances of shocrete, combining with MIP and SEM, the microstructure of concrete is analyzed and characterized by impermeability and freezing-thaw cycle test methods. The results show that permeated crystalline materials can improve the performances of impermeability and freezing-thaw cycle of shotcrete. It is because that permeated crystalline materials can improve the microstructure of interfacial transition zone of concrete and cement stone, improve the pore size distribution of concrete, which make more content of less harmful pores and less content of harmful pores. Therefore, most probable pore size of concrete reduces and the performances of impermeability and freezing-thaw cycle of concrete are improved.
    聚醚型聚羧酸系減水劑的性能研究
    聚醚型聚羧酸系減水劑的性能研究
    • 宋家樂1,2,溫宏平1,呂長亮1,李煒光1,2,王太山2
    2011年第12期
    摘要
    引用本文
    摘 要:采用改性聚醚F-108、HZ-004、丙烯酸為單體,在水溶液中通過氧化還原引發體系自由基聚合合成了一系列聚醚型聚羧酸減水劑。研究了不同分子量的主、側鏈分子結構、不同聚合溫度及引發劑加入方式等對減水劑水泥凈漿分散性的影響關系。研究結果表明,最佳合成工藝條件為丙烯酸與活性大單體HZ-004的摩爾比為5:1,改性聚醚HZ-004與F-108的質量比為3:1,反應溫度為75~80℃,引發劑一次性加入或滴加時,合成的聚醚型聚羧酸減水劑具有優異的分散性。 Abstract: In aqueous solution, using the modified polyether F-108, HZ-004, acrylic acid as monomer, a series of polyether-type polycarboxylic water reducers are synthesized from free radical copolymerized through oxidation-reduction initiator system. The effects of the polyether structure of main chain and side chain with different molecular weight, the different polymerization temperature and the addition way of initiator on the fluidity of cement paste are studied. The results show that the optimal synthesis conditions are determined when the mole ratio of acrylic acid and modified polyether HZ-004 as 5:1, the mass ratio of modified polyether HZ-004 and F-108 as 3:1, the reaction temperature between 75~80℃, initiator added in one batch or dropped, the polyether-type polycarboxylic water reducer has excellent dispersion.
    摻合料和粗骨料對C60高性能混凝土徐變性能的影響
    摻合料和粗骨料對C60高性能混凝土徐變性能的影響
    • 肖 佳1, 陳 雷2 ,邢 昊1
    2011年第11期
    摘要
    引用本文
    摘??要:通過混凝土徐變試驗研究了C60高性能混凝土的徐變性能。試驗結果表明,隨著齡期增長,徐變系數增大,收縮變形增加,徐變速率降低。同齡期時,雙摻23%粉煤灰和10%礦粉降低了混凝土的徐變系數和收縮應變;持荷180d,純水泥混凝土的徐變系數為1.304,而雙摻混凝土徐變系數較純水泥混凝土下降了10.4%。小石率60%的雙摻混凝土持荷180d的徐變系數為0.996,較小石率58%的徐變系數相應降低了14.7%。在0~180d測試持荷時間內,實測的徐變系數約為中鐵規范計算徐變系數的53%~72%,約為中交規范計算徐變系數的50%~73%。Abstract:ThecreeppropertiesofC60highperformanceconcretearestudiedthroughconcretecreepexperiment.Theexperimenttestresultsindicatethatcreepcoefficientandshrinkagedeformationincreaseandcreepratedecreaseswithagedeveloping.Atthesameage,multiplemixtureof23%flyashand10%slagmakesthecreepcoefficientandshrinkagestrainofconcretereduce,andthecreepcoefficientofcementconcreteis1.304afterloading180d,whilethatofmultiplemixtureconcretedecreasesby10.4%comparedwiththatofpurecementconcrete.Afterloading180d,thecreepcoefficientofmultiplemixtureconcretewith60%handstonerateis0.996,whichreducesby14.7%comparedwithmultiplemixtureconcretewith58%handstonerate.During0~180dloadingtime,thetestingcreepcoefficientis53%~72%ofcalculatedvalueofChineserailwayspecificationandis50%~73%ofcalculatedvalueofChinesetrafficspecification.
    液體速凝劑對水泥早期水化的影響研究
    液體速凝劑對水泥早期水化的影響研究
    • 林宗良1,張建綱1,2
    2011年第11期
    摘要
    引用本文
    摘 要:通過凝結時間、早期抗壓強度、水化熱、水化產物形貌等研究了液體速凝劑對水泥早期水化反應歷程的影響。結果表明,使用液體速凝劑的水泥漿體在水化的初始階段形成了大量的水化鋁酸鈣晶體及針棒狀的鈣礬石,從而促進了水泥漿體的凝結。液體速凝劑增加了水泥早期產物中鋁酸鹽與硫酸鹽的比例,加快了鈣礬石(AFt)轉化為單硫型硫鋁酸鈣(AFm)的轉化速度,縮短了誘導期,使水化加速期提前到來,從而促進了水泥砂漿早期抗壓強度的發展。 Abstract: The effect of liquid setting accelerator(LSA) on the early hydration of cement is studied by setting time, early compressive strength, early hydration heat evolution and hydrates morphology. The results indicate that at the beginning hydration, the cement paste with LSA produces a mass of hydrated calcium aluminates crystal and clubbed ettringite (AFt) crystal, which is the main reason of improving the cement paste setting. The LSA increases the ratio of aluminates and sulfate in the early hydration products of cement, which results in the transformation of AFt to AFm, shortens the induced period, makes the acceleration period coming earlier, so improves the development of the early compressive strength of cement paste.
    石粉含量對機制砂混凝土力學性能與微觀結構的影響
    石粉含量對機制砂混凝土力學性能與微觀結構的影響
    • 張禮華1,劉來寶1,周永生1,王忠祥2
    2011年第12期
    摘要
    引用本文
    摘 要:采用石英質機制砂石粉,討論了石粉含量對中低等級強度混凝土工作性和力學性能的影響規律,并選取三種不同巖性機制砂石粉,運用SEM、XRD等測試方法研究其對水泥水化產物及其微結構的影響。結果表明,石粉的摻入可明顯改善混凝土的和易性及力學性能,混凝土強度等級越高,其石粉合理摻量應越??;石粉對水泥水化產物及其微觀形貌影響較??;石粉含量變化引起細骨料(機制砂)級配優化作用是普通機制砂混凝土工作性和力學性能得到改善的主要原因。 Abstract: The influences of the content of quartziferous rock powder on the workability and mechanical properties of moderate and low-grade concrete are discussed. By X-ray diffraction analysis and scanning electron microscopy, the effects of three manufactured sand rock powder with different rock characters on hydration products and microstructure of cement are also studied. The results reveal that rock powder can obviously improve the workability and mechanical properties of concrete. The minor content of rock powder is suitable for the higher strength concrete. The rock powder has little influences on hydration products and microstructure of cement. The graded optimization function of fine aggregate (manufactured sand) caused by the various content of rock powder plays the leading role in improving the workability and mechanical properties of general manufactured sand concrete.
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