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    蘇州混凝土水泥制品研究院有限公司

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    第十一期

    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.
    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%.
    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.
    鐵尾礦砂有效堿含量的測定及堿活性研究
    鐵尾礦砂有效堿含量的測定及堿活性研究
    • 朱蓬萊,丁薇薇,楊 建,錢曉倩
    2011年第11期
    摘要
    引用本文
    摘??要:采用水溶法、改進的ASTMC311法測定了鐵尾礦砂在不同溫度條件下的有效堿含量,并按照DL/T5151-2001《水工混凝土砂石骨料試驗規程》檢驗了鐵尾礦砂的活性。結果表明,磨細的鐵尾礦砂在堿性條件下Na+、K+溶出量明顯大于水中的溶出量,80℃下28d時有效堿含量為水溶法的10倍?;瘜W法測得的鐵尾砂礦RC>70,SC.TheresultsindicatethattheNa+andK+releaseoflevigatedirontailingsandunderthealkalineconditionisobviouslymorethanthatofthesandinpurewater,andtheavailablealkalisunder80℃and28daysis10timesthanthatoneusingthewatersolublemethod.ThechemicalmethodshowthatRC>70andSC
    檢查井蓋板結構計算方法
    檢查井蓋板結構計算方法
    • 曹生龍
    2011年第11期
    摘要
    引用本文
    摘 要:針對目前有關地下管道構筑物結構圖冊存在的不足,詳細地介紹了檢查井蓋板結構的計算方法。計算并分析了不同埋設深度、不同方向、不同位置的蓋板內力及最大蓋板撓度,進而合理地確定了蓋板的配筋情況,并列出了目前工程常用規格品種的配筋表。 Abstract: According to some present defects in structure atlas of the underground pipe structures, calculation methods of manhole cover plates are introduced in detail. Meanwhile, internal forces of the cover plates with different embedding depths, directions, locations and the maximum deflection of cover plates are calculated and analyzed. And then the reinforcement of manhole cover plates is reasonable determined, and the reinforcement tables with usual varieties in current projects are listed
    CFG樁復合地基基坑開挖新方案的探討
    CFG樁復合地基基坑開挖新方案的探討
    • 王育德,李 濤,米愛軍
    2011年第11期
    摘要
    引用本文
    摘 要:近年來,水泥粉煤灰碎石樁(簡稱CFG樁)以其低成本、高承載力、方便施工等優勢廣泛應用于高層住宅建筑中。但CFG樁在基坑開挖過程中,如開挖方法不當會造成樁身斷裂等情況,直接影響成樁的質量和施工進度。本文結合某高層建筑CFG樁復合地基基坑開挖過程中產生的斷樁情況,分析了在基坑開挖過程中影響樁體斷裂的不確定因素和基坑開挖過程中應注意的問題,介紹了案例工程中對這些問題的解決方案 Abstract: In recent years, cement fly ash gravel (CFG) piles with its low cost, high bearing capacity, convenient construction advantage are widely used in high-rise residential buildings. However, in the pit excavation process, pile fracture is caused by immature excavation scheme, which will directly affect the quality of piles and construction schedule. In this paper, combined with pile breaking producing in CFG piles composite foundation pit excavation process of a high-rise building, the uncertainty factors affecting the pile fracture in excavation process and the problems paid attention to the excavation process are analyzed, and the solution of these problems in the project is introduced.
    纖維增韌水泥基復合材料拉伸性能影響因素研究
    纖維增韌水泥基復合材料拉伸性能影響因素研究
    • 張倩茜1,袁廣林1,張徑偉2,田露丹1
    2011年第11期
    摘要
    引用本文
    摘 要:通過纖維增韌水泥基復合材料(ECC)單軸拉伸試驗,研究了ECC的拉伸應力-應變關系曲線,分析了砂膠比、纖維類型、粉煤灰及礦渣含量等因素對ECC拉伸應變能力的影響規律。試驗結果表明,ECC的拉伸應變能力對于組分及配比較為敏感,增加粉煤灰含量可有效提高ECC的拉伸應變能力;增大砂膠比及礦渣含量可以提高材料初裂強度及極限抗拉強度,但不能提高ECC的拉伸應變能力;鋼纖維的摻入對于提高材料的應變硬化能力及實現多裂縫開展能力不利。 Abstract: Uniaxial tensile text has been carried out to study the tensile stress-strain relationship of engineering cementitious composites(ECC), and the influence laws of sand-binder ratio, fiber types, fly ash content and slag content on ECC’s tensile strain ability have been analyzed. Experimental results show that the tensile strain ability is sensitive to the ingredients and mixing proportions. The tensile strain ability would be improved effectively with the fly ash content increasing in general. The increase of sand-binder ratio and slag content is helpful to improve the first-crack strength and ultimate tensile strength of ECC, but it can’t improve the tensile strain ability of ECC. Moreover, adding steel fiber is disadvantageous to improve the strain-hardening ability and the development of multi-fractures of ECC
    纖維增強型水泥基復合材料的理論發展及應用分析
    纖維增強型水泥基復合材料的理論發展及應用分析
    • 陳 茜,伍勇華
    2011年第11期
    摘要
    引用本文
    摘 要:介紹了纖維增強型水泥基復合材料的幾種主要的理論及其發展歷程,其中重點介紹了近年來興起的具有代表性的設計型材料ECC (Engineered Cementitious Composites)的相關設計理論及其應用,并歸納總結了生產應用此類材料時存在的問題,提出了相應的解決方案。 Abstract: The development of several basic theories of designing the fiber reinforced cementitious composites is introduced, among which the method and utility of designing a new appeared representative material named ECC (Engineered Cementitious Composites)is introduced carefully. Several approaches which are supposed to solve problems encountered in experiments or production are concluded and analyze
    再生混凝土柱受壓性能的有限元模擬分析
    再生混凝土柱受壓性能的有限元模擬分析
    • 王樂天1,劉 煦2,劉 超2,郭 帥3
    2011年第11期
    摘要
    引用本文
    摘 要:通過ANSYS軟件模擬了單調加載作用下不同再生骨料取代率再生混凝土柱的受壓性能,得出了荷載-側向位移關系曲線和荷載-混凝土應變關系曲線,并與相應的試驗結果進行了比較分析。結果表明:有限元分析得到的破壞形態、混凝土應變及側向位移與試驗結果十分接近,驗證了ANSYS分析再生混凝土受力性能的有效性。 Abstract: The load-strain curves of concrete and the load-displacement curves are carried out by ANSYS software simulating the loading capacity of recycled aggregate concrete columns with different percentage replacement of recycled coarse aggregate under monotonic loading, and the analysis results are compared with the experimental results. The results show that the failure mode, the concrete strain and the lateral displacement obtained by finite element analysis are close to the experimental results, which can verify the validity of ANSYS software to analyze the loading capacity of recycled aggregate concrete.
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