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    蘇州混凝土水泥制品研究院有限公司

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    第五期

    高性能預應力孔道灌漿料的試驗研究
    高性能預應力孔道灌漿料的試驗研究
    • 于 超,馬海峰,張亞梅
    2014年第5期
    摘要
    引用本文
    摘 要:研究了預應力孔道灌漿料中各種外加劑(高效減水劑、穩定劑、緩凝劑、消泡劑及早期塑性膨脹劑和中后期膨脹劑)對水泥基灌漿料各項性能的作用和影響。通過摻加各種外加劑,得到了一種具有流動性高、早期后期強度高、無泌水、不離析分層、微膨脹等優點的后張法預應力孔道壓漿料。 Abstract: The effects of various admixtures (superplasticizer, stabilizing agent, retarder, plastic expansion agent, expansive agent for early and later age purposes and defoaming agent) on the properties of cement-based prestressed duct grouting material are investigated. Through optimization of various additives, a kind of post-tensioned prestressed duct grouting material with high fluidity, early high strength, no bleeding, no segregation, and micro expansion is obtained.
    抗裂圓環的干縮應力分析——Ⅴ. 不均勻干燥時水泥基材料彈性模量的影響
    抗裂圓環的干縮應力分析——Ⅴ. 不均勻干燥時水泥基材料彈性模量的影響
    • 張承志1,王愛勤2,陳文耀3
    2014年第5期
    摘要
    引用本文
    摘 要:根據彈性力學基本方程,研究了不均勻干燥時水泥基材料彈性模量對徑向位移分布、徑向應變分布、環向應變分布、徑向應力分布和環向應力分布的影響,并與均勻干燥情況進行了比較。通過比較發現,不均勻干燥時的最大徑向位移、最大徑向應變、最大環向應變和最大徑向應力都比均勻干燥時的小。采用實芯鋼芯時,不均勻干燥時的最大環向拉應力也比均勻干燥時的??;采用空芯鋼芯時,不均勻干燥時的最大環向拉應力有可能超過均勻干燥時的最大環向拉應力。水泥基材料的彈性模量越高,這種可能性就越大。 Abstract: According to the equations of elasticity, the influences of the elastic modulus of cement-based material on the distribution of the radial displacement, radial strain, circumferential strain, radial stress and circumferential stress under the drying inhomogeneous condition are studied, and they are compared with these under the drying homogeneous condition. It is discovered by comparison that the maxima of the radial displacement, the radial strain, the circumferential strain and the radial stress under the drying inhomogeneous condition are less than that under the drying homogeneous condition. If solid steel core is used, the maximum of the circumferential tensile stress under the drying inhomogeneous condition is also less than that under the drying homogeneous condition. However, if hollow steel core is used, it is possible that the maximum of the circumferential tensile stress under the drying inhomogeneous condition is over that under the drying homogeneous condition. The higher the elastic modulus of cement-based material, the larger the possibility is.
    不同粗骨料級配對橡膠混凝土材料性能的影響
    不同粗骨料級配對橡膠混凝土材料性能的影響
    • 王 勇,孫洪泉,杜文英,李文兵
    2014年第5期
    摘要
    引用本文
    摘 要:通過新拌混凝土坍落度、立方體抗壓強度和彈性模量的試驗,研究了不同粗骨料級配對橡膠混凝土材料性能的影響,并分析了造成這些影響的原因。研究表明,橡膠粉的加入改變了混凝土的受力機理,對于普通混凝土,骨料和水泥石的界面粘結強度決定了混凝土的強度,而影響橡膠混凝土強度的主要因素在于橡膠粉與水泥石的薄弱界面;不同粗骨料級配下,橡膠混凝土抗壓強度和彈性模量的影響因素不同于普通混凝土。 Abstract: Material properties of crumb rubber concrete(CRC) with different aggregate gradation are studied, and the reasons resulting to these differences are explained through the experiment of the slump of pumped concrete, compressive strength and elastic modulus of concrete cube. The results show that the crumb rubber in concrete can change stress mechanism of crumb rubber concrete. That is to say the interfacial bond strength from coarse aggregate and cement stone determines the strength of concrete for normal concrete, while the interfacial bond strength from crumb rubber and cement stone determines the strength of CRC. The factors affecting compressive strength and elastic modulus of rubber concrete are different from these factors of ordinary concrete, under the action of different coarse aggregate gradation.
    C35、C40干混自密實混凝土的配合比試驗研究
    C35、C40干混自密實混凝土的配合比試驗研究
    • 夏永清1,李延和2,羅 憨1
    2014年第5期
    摘要
    引用本文
    摘 要:干混自密實混凝土屬于高性能混凝土,其配合比設計理念與常規混凝土有很大差別。本文提出了水料比的概念,并進行了C35、C40干混自密實混凝土的配合比設計,通過試驗開展了自密實混凝土工作性能的分析研究。 Abstract: Dry-mixed self-compacting concrete is high performance, and its method of mixing proportion is different from conventional concrete. The concept of ratio of water-aggregate is put forward in this paper, and a method of mixing proportion for C35、C40 dry-mixed self-compacting concrete is described, and its working performances are analyzed by experiment.
    基于溫度場和膨脹歷程雙重調控的側墻結構防裂技術
    基于溫度場和膨脹歷程雙重調控的側墻結構防裂技術
    • 田 倩,王育江,張守治,姚 婷,徐 文,劉加平
    2014年第5期
    摘要
    引用本文
    摘 要:地下室側墻混凝土裂縫是建筑結構工程裂縫控制的關鍵和難點。本文基于工程實體結構的調研與監測數據,分析了地下室側墻結構開裂機制。采用新型的水泥水化放熱速率調控化學外加劑,一方面降低水泥水化加速期的放熱速率,為結構散熱贏得時間,削弱溫峰;另一方面與膨脹劑復合時,延緩結構升溫速度有助于調控膨脹劑的膨脹歷程,建立更加有效的膨脹預壓應力,提高膨脹劑的補償收縮能力。通過結構溫度場和膨脹歷程雙重調控技術,有效解決了地下室工程側墻混凝土開裂問題。 Abstract: Sidewall cracking of underground structure is the most difficult and key point for the cracking inhibiting of building structures. In this paper, the cracking mechanism of such kind of structure is analyzed based on the investigation and site-monitoring data from real engineering projects. A new type of chemical admixture is developed to adjust the hydration heating rate of cement. The proposed admixture could, on one side, reduce the hydration heating rate of cement during the accelerating stage, provide more time for the radiating of structure and thus lower the temperature peak effectively; on the other side, when composed with expansive agent, the delayed heating rate of the concrete structure could adjust the expansion history of expanding agent and build more effective expansion pre-stress and thus enhance the shrinkage-compensating effect to a large extent. The application of this dual-regulation technology of temperature field and expansion history effectively resolve the practical side-wall cracking problems for real underground engineering projects.
    再生混凝土疊合梁抗彎性能試驗研究
    再生混凝土疊合梁抗彎性能試驗研究
    • 張 毅
    2014年第5期
    摘要
    引用本文
    摘 要:在普通混凝土澆筑的腹板上采用二次澆注再生混凝土翼緣制成疊合梁并進行抗彎承載力試驗,對比分析了各疊合梁的抗彎性能、變形特性及其極限破壞形態。試驗結果表明,平截面假定理論依然成立;隨著再生骨料取代率的提高,梁撓曲變形增加的速率有所提高,但跨中極限撓度值相差不大;梁的抗裂性能略有降低;再生骨料的取代率差異對疊合梁的抗彎極限承載力及極限破壞形態影響不顯著。 Abstract: The flexural behavior of composite beams made of ordinary and recycled concrete is comparatively analyzed. The results show the theory of plane assumption is still valid; with the increase of displacement ratio of recycled aggregates, the growing ratio of the deflection of composite beams is moderately improved, but the ultimate deflection of mid-span of composite beams is similar; the crack resistance of beams is slightly lowered; the influence of different replacement ratio of recycled aggregates on the flexural bearing capacity and ultimate damage mode of composite beams is not significant.
    對增強型填芯混凝土管樁的水平承載力試驗及理論分析
    對增強型填芯混凝土管樁的水平承載力試驗及理論分析
    • 楊子京,白曉紅,賀武斌,郭昭勝
    2014年第5期
    摘要
    引用本文
    摘 要:為了不使基樁在地震作用下由于節點的薄弱而提前失去承載能力,結合室內擬靜力試驗,對不同節點加強方式的管樁承臺節點模型進行了水平承載力試驗研究。對比了在節點處設置加強環和將普通填芯換做勁性填芯的試件節點的抗彎能力、裂縫發展情況和破壞模式,并依據實測的破壞荷載得出了相當于普通填芯混凝土管樁的樁體嵌入承臺的深度,分析比較了試驗試件與等效試件的裂縫發展情況和破壞形式,為樁基抗震設計提供參考和幫助。 Abstract: In order to make sure the node of piles and cap provide enough carrying capacity during the earthquake, the nodes with different enhanced filled concrete pile under the quasi-static loading conditions are studied. The bending strengths, crack development and destructive mechanism of specimen nodes with setting ring at the node and replacing common core to stiff fill core are compared. The equivalent embedded depth of pile into the cap is calculated based on the experimental results of failure loadings. The experiment results can provide a reference to the seismic design of concrete pile node.
    基于空間桁架模型的樁基礎厚承臺的優化設計建議
    基于空間桁架模型的樁基礎厚承臺的優化設計建議
    • 王 坦1,2,周麗丹3
    2014年第5期
    摘要
    引用本文
    摘 要:運用試驗和理論分析的方法,結合空間桁架模型理論,從混凝土強度,承臺底部鋼筋配筋形式,承臺中部設置水平鋼筋網等方面,提出了針對樁基礎承臺的優化設計建議。 Abstract: Base on the theory of spacial strut-and-tie model, and using the method of experiments and theoretical analysis, some optimization design suggestions of thick pile caps are put forward from the aspect of concrete strength, reinforcement form of the bottom of pile caps and horizontal mat reinforcement set in the central pile caps.
    疏浚泥固化工程預制品的研制與示范應用
    疏浚泥固化工程預制品的研制與示范應用
    • 李 陽,朱盛勝
    2014年第5期
    摘要
    引用本文
    摘 要:采用化學固化的方法,研制疏浚泥固化工程預制品。試驗結果表明,疏浚泥固化工程預制品的抗壓強度達到15MPa以上,抗滲、抗凍性能良好。并且就地利用疏浚泥生產固化預制品,大大降低了施工成本,該項技術在灘涂促淤、水利工程領域具有良好的推廣應用前景。 Abstract:By using the hardening agent, a dredged mud solidification engineering prefabrication is developed. The test results show that the compressive strength of the dredging solidification engineering prefabrications can reach more than 15MPa, the impermeability and frost resistance of concrete are good. Using local dredged mud to produce engineering prefabrication can greatly reduce the construction cost, and has good popularization and application prospects in the mudflats silting and water conservancy projects.
    摻入兩種纖維的RPC氯離子擴散性能試驗研究
    摻入兩種纖維的RPC氯離子擴散性能試驗研究
    • 曹 霞1,李文龍1,陳宜虎2
    2014年第5期
    摘要
    引用本文
    摘 要:通過快速氯離子擴散系數的測定方法(NEL法),對16組不同鋼纖維和聚丙烯纖維摻量的活性粉末混凝土(RPC)試件進行試驗,每組試塊采用三種不同養護方案。試驗結果表明,經過濕熱養護后的RPC試塊的抗氯離子擴散性能得到較大提高;摻入鋼纖維不利于RPC的抗氯離子擴散性能,RPC中鋼纖維的最佳體積摻量比例為2%;摻入聚丙烯纖維對RPC的抗氯離子擴散性能有很大提高,則RPC中聚丙烯纖維的最佳體積摻量比例為0.2%:混合摻入兩種纖維的RPC,可結合兩種纖維的特性,抗氯離子擴散性能得到有效的提高。 Abstract: Based on a rapid measuring method of the chloride ion diffusion coefficient (the NEL test method), 16 groups of reactive powder concrete (RPC) specimens with steel fiber and polypropylene fiber are tested. Each group of RPC specimens is taken three kinds of curing measures. The results show that anti-chloride ion diffusion property of RPC specimens under the condition of heat curing is improved. Steel fiber can decrease anti-chloride ion diffusion property of RPC, and its optimum volume content is 2%. Polypropylene fiber can improve greatly anti- chloride ion diffusion property of RPC, and its optimum volume content is 0.2%. Anti-chloride ion diffusion property of RPC with the two kinds of fibers is improved effectively, due to the advantages of steel fiber and polypropylene fiber.
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