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    蘇州混凝土水泥制品研究院有限公司

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    第十期

    功能型第三單體對聚羧酸減水劑分散及分散保持性能的影響
    功能型第三單體對聚羧酸減水劑分散及分散保持性能的影響
    • 王秀梅,丁 婭,張 霞,楊 勇,徐 文
    2015年第10期
    摘要
    引用本文
    摘 要:通過自由基熱聚合的方法合成了相同羧基密度、相同側鏈長度和密度、不同功能型第三單體的一系列PCE (Polycarboxylate, PCE),利用GPC、FT-IR等手段對PCE結構表征,通過分析其對水泥漿體的Zeta電位、分散、吸附等的影響規律,研究了不同功能型第三單體對PCE宏觀性能的影響規律。結果表明,功能型第三單體為丙烯酰胺的PCE吸附量最大,初始凈漿流動度最大,流動性保持能力較丙烯酸-2-羥乙酯(HEA)或者丙烯酸羥丙酯(HPA)要差。功能型第三單體為HEA或者HPA的PCE在水泥表面的吸附量相當,但由于HEA較HPA生成的PCE吸附層厚度更厚,因而第三單體為HEA的PCE初始凈漿流動度較HPA要大。 Abstract: Comb-like polycarboxylate with the same density of carboxylic acid, same side chain length and side chain density, but different third functional monomer was synthesized by the method of radical thermal polymerization. The structure of PCE was characterized by GPC and FT-IR. The influences of third functional monomer on the macroscopic properties, for instance, the Zeta potential, dispersion and adsorption of the fresh cement paste were investigated systematically. The results indicate that the adsorption amount of PCE with AM as the third functional monomer is the maximum, thereby the best workability of cement paste. However, the fluidity retention capacity is poor than HEA or HPA. The adsorption amount of PCE with HEA or HPA as the third functional monomer is almost the same. Furthermore, the adsorbed layer thickness of PCE with HEA is thicker than HPA, thereby the initial fluidity is larger than HPA.
    加熱改性再生混凝土粗骨料試驗研究
    加熱改性再生混凝土粗骨料試驗研究
    • 蘇 燕,古 松,常曉蕾,李金星
    2015年第10期
    摘要
    引用本文
    摘 要:采用加熱法對簡單破碎再生混凝土粗骨料進行正交試驗改性研究。加熱工藝的控制參數為加熱溫度、恒溫時間,對加熱后再生粗骨料表面附著砂漿的剝離方式采用混凝土振動臺,控制參數為混凝土振動臺振動時間。試驗測試了改性前后再生骨料的吸水率、表觀密度、壓碎指標,采用極差分析法對正交試驗結果進行分析。結果表明,加熱溫度可明顯改善再生粗骨料性能,而增加恒溫時間及振動臺振動時間對提高再生粗骨料性能效果不顯著。 Abstract: Heating method was adopted to improve the performance of simple crushed recycled coarse aggregate and the experiment method was the orthogonal test. Control parameters in heating process were the heating temperature and constant temperature time, and in the process of wiping out the surface mortar on heated recycled aggregate, the concrete vibrating table was used, the controlling parameter for this process was the vibration time. The rate of water absorption, apparent density, crush index of recycled coarse aggregate before and after the improving process were tested, and the range analysis results of orthogonal test show that controlling heating temperature can significantly improve the performance of recycled coarse aggregate, and the effect by increasing the time of constant temperature and vibration time to improve the recycled coarse aggregate performance is not significant.
    超高強混凝土補償收縮措施的研究
    超高強混凝土補償收縮措施的研究
    • 彭 園1,趙日煦1,楊 文1,吳 雄1,王 淑1,霍 亮2
    2015年第10期
    摘要
    引用本文
    摘 要:針對超高強混凝土水膠比小、自收縮大等特點,研究了不同膨脹源膨脹劑和多孔摻合料對超高強混凝土工作性能、力學性能和自收縮性能的影響。結果表明,膨脹源為MgO的BTMG膨脹劑水化較慢,反應耗水少,晶體膨脹能大,摻BTMG超高強混凝土早期(3d)膨脹效果不明顯,后期具有持續膨脹效果。預吸水的稻殼灰(RHA)和沸石粉(NZ)均能在養護后期釋放水分,緩解混凝土內部濕度的降低,一定程度上彌補了混凝土自收縮,但RHA活性較NZ高,孔結構更為豐富,配制的超高強混凝土工作性能和強度損失??;BTMG與RHA復合后使用可將二者優勢互補,提高混凝土體積穩定性和后期強度。 Abstract: As with low water-binder ratio and high autogenous shrinkage of ultra-high strength concrete (UHSC), influence of expansive agent with different expansion sources and porous mineral admixture on workability, mechanical properties and autogenous shrinkage of UHSC were studied. Results showed that the hydration rate of expansive agent with expansion sources of MgO was slower and hydration process needed littler water than other expansive agents, which resulted in BTMG had little effect on shrinkage-compensation of UHSC at early age, and much useful effect at later age. Inside water of pre-wet rice husk ash (RHA) and natural zeolite (NZ) would be released along with curing age, which improved volume stability of UHSC because the inside humidity of UHSC increased. The pozzolanic activity of RHA was higher and pore structures diversed more than NZ, making UHSC with better workability and compressive strength. Under the compound use of BTMG and RHA, UHSC got high volume stability and compressive strength with stack effect.
    橡膠粉集料混凝土抗鹽凍性能的試驗研究
    橡膠粉集料混凝土抗鹽凍性能的試驗研究
    • 徐金花1,2,王肖宇1, 陳四利1
    2015年第10期
    摘要
    引用本文
    摘??要:取最大粒徑為0.3mm的橡膠粉按5%、10%、15%和20%四種不同摻量替代等體積的細骨料砂制作橡膠集料混凝土試件,對其進行Na2SO4溶液侵蝕下的快凍試驗,研究橡膠集料混凝土在鹽凍環境作用下的耐久性。研究表明,橡膠粉的摻入對混凝土的抗鹽凍性能有著明顯的改善作用,尤其是摻量為5%~10%時效果較好。與清水環境下的凍融試驗相比,在凍融作用前期Na2SO4溶液對抗凍性的影響是有利的,而隨著凍融次數的不斷增加,Na2SO4溶液的侵蝕劣化作用開始突顯,橡膠集料混凝土的動彈性模量下降速度加快,抗鹽凍性能快速降低。Abstract:Thecrumbedtirerubberpowderwasusedtoreplacefineaggregates,whosegrainsizeis0.3mm.Thereplacementlevelswere5%,10%,15%and20%byvolumeofthefineaggregates.Anexhaustivestudyshouldbecarriedondurabilityofcrumbrubberconcreteundercomplexcondition,whichendurescorrosionofNa2SO4?andfreeze-thawcycles.Theresearchshowsthatappropriateproportionalfineaggregatereplacedbyrubberpowdercanimprovetheresistancetosaltfreezingofconcrete,especiallymixing5%and10%rubberpowder.Intheearlystages,Na2SO4?solutionplaysabeneficialrole.Butdynamicelasticitymodulusofcrumbrubberconcretedecreasewithincreasingoffreeze-thawcyclesandperformanceobviouslydeteriorates.
    水泥礦物組成對混凝土TSA侵蝕的影響
    水泥礦物組成對混凝土TSA侵蝕的影響
    • 張昺榴,馬保國,王迎斌
    2015年第10期
    摘要
    引用本文
    摘??要:通過外觀變化、砂漿強度、XRD及SEM-EDS分析等技術,研究了兩種不同礦物組成的水泥對摻石灰石粉水泥砂漿經溫度為5℃、質量分數為5%的MgSO4溶液侵蝕后碳硫硅鈣石形成的影響。結果表明,Al相含量越多,生成的碳硫硅鈣石越多,侵蝕越嚴重。通過對水泥礦物組成進行合理優化,可以提高混凝土抗TSA侵蝕能力,提高其耐久性。Abstract:Theeffectoftwodifferentmineralcompositionsonthethaumasiteformationofcementpastescontaininglimestonepowderwasinvestigated.Thesampleswerecuredin5%MgSO4solutionat5℃.Itwasanalyzedbyappearanceerosionchange,X-raydiffraction,mortarstrength,scanningelectronmicroscopyandenergydispersespectroscopy.Theresultsshowthatmorealuminumphasewillleadtoformmorethaumasite.Byoptimizingthemineralcompositionofcementreasonably,theconcretecanenhancetheabilityofresistingthethaumasiteformofsulfateattack.
    石粉作摻合料對機制砂高性能混凝土性能的影響
    石粉作摻合料對機制砂高性能混凝土性能的影響
    • 劉曉東
    2015年第10期
    摘要
    引用本文
    摘 要:采用材料學原理和高性能混凝土配制技術,研究了石粉做摻合料對C30、C60、C80機制砂混凝土工作性、強度和抗滲性能的影響。結果表明,石粉作摻合料在C30、C60、C80機制砂高性能混凝土的取代比例高達20%、15%、10%時,其和易性、強度及抗氯離子滲透性能均較好。 Abstract: By principle of material science and high performance concrete preparation technology, the workability, strength and impermeability on C30, C60, C80 of manufactured-sand high performance concrete are studied. Results show that workability, strength and impermeability are better when 20%, 15% and 10% cement is replaced by stone dust as admixture in C30, C60, C80 high performance concrete.
    基于孔結構分析的引氣混凝土鹽凍耐久性研究
    基于孔結構分析的引氣混凝土鹽凍耐久性研究
    • 秦 菱1,武 衛1,王思揚2,王欣宇方3
    2015年第10期
    摘要
    引用本文
    摘 要:北方地區機場道面對混凝土材料的耐鹽凍性能有較高要求,引氣混凝土的使用能有效增強其鹽凍耐久性。本文測試了兩種典型引氣混凝土在不同摻量下的鹽凍剝蝕量,基于混凝土孔結構分析方法,利用“CAD簡化法”和Matlab編程,統計計算出試件的孔徑分布、平均孔徑和孔間系數等參數并分別研究各參數對混凝土鹽凍耐久性的影響。從微觀層面評價了引氣劑對機場道面混凝土鹽凍耐久性的改善作用,為寒冷地區機場道面材料的研究與應用提供參考。 Abstract: Airfield runway in the north area has higher requirements for the frost resistance durability of the concrete material and the use of air-entrained concrete can effectively enhance its frost resistance durability. The scaled mass of two typical kinds of air-entrained concrete under different parameters is tested in this paper. Based on the analysis of the pore structure, “CAD simplified method” and the Matlab programming, the parameters of stomatal distribution, average pore diameter and inter-hole coefficient for the specimen are statistically calculated and the relationship between them and frost resistance durability of concrete are studied. The improvements of concrete frost resistance durability are evaluated by the air entraining agent, which can offer references to the research and application of airfield runway material in the cold area.
    綜合管廊埋深數值分析
    綜合管廊埋深數值分析
    • 廖四海1,黃立夫2,李 雄1,蔡 智2
    2015年第10期
    摘要
    引用本文
    摘 要:以福建省平潭市政道路項目為背景,通過巖土有限差分軟件Flac3D建模,進行了綜合管廊應力分布數值模擬。在所建模型中,包含4個關鍵位置。保持綜合管廊上部荷載不變,改變綜合管廊埋深,通過監測每個位置的豎向應力值,得出關鍵位置應力與埋深的估算關系式;保持綜合管廊埋深不變,改變綜合管廊上部荷載,通過監測每個位置的豎向應力值,得出關鍵位置應力與上部荷載的估算關系式。所得的兩個估算式可供綜合管廊設計及施工估算應力借鑒。 Abstract: Based on the municipal road projects in Pingtan, Fujian Province, a numerical simulation model for stress distribution of utility tunnel based on the fast Lagrangian analysis of continua in three dimensions (FLAC3D) is established. In this model, there are 4 key positions. By changing the buried depth of utility tunnel, the vertical stress of each position is monitored. Then, an estimated formula is obtained, which shows the relation between the stress of key positions and the buried depths; by changing the upper load of utility tunnel, the vertical stress of each position is monitored. Then, an estimated formula is obtained, which shows the relation between the stress of key positions and the upper loads. The two estimated formulas can provide a reference for the design of utility tunnel and estimating stress in construction.
    用于復合地基的預應力混凝土管狀增強體設計試驗研究
    用于復合地基的預應力混凝土管狀增強體設計試驗研究
    • 蔡黎明1,周集建1,孫加輝1,梁 鋒2,李廣強3
    2015年第10期
    摘要
    引用本文
    摘 要:對用于靜壓法施工的復合地基的預應力混凝土管狀增強體進行了設計試驗研究。結果表明,根據預應力管狀增強體在復合地基中的受力狀態和吊裝、運輸、施工過程的受力狀態,與傳統管樁相比采用較低配筋率是可行的,也有一定的經濟性。 Abstract: Based on the stress status of the reinforcement and the static compressive construction method, a kind of prestressed tubular reinforcement of composite foundation is designed and tested. The results show that considering the stress status of prestressed tubular reinforcement in composite foundation and in lifting, transportation and construction process, it is feasible and has certain economic value that designed the prestressed tubular reinforcement has less steel bars compared with that of the traditional pile.
    PHC管樁與鉆孔灌注樁的分析與對比
    PHC管樁與鉆孔灌注樁的分析與對比
    • 姜正平1,2,明 維2,周展釗2,何耀暉2,匡紅杰3
    2015年第10期
    摘要
    引用本文
    摘 要:對比了鉆孔灌注樁與PHC管樁在性價比、施工質量可控性及對環境影響方面的差異,著重分析了PHC管樁與鉆孔灌注樁的力學性能差異,同時還對比了在相同軸向承載力的情況下,PHC管樁與鉆孔灌注樁在原材料消耗成本、施工制作成本方面的不同。結果表明,在公路、鐵路、水利等相關工程中,用PHC管樁替代鉆孔灌注樁,不但可以節省25%~40%的工程造價,而且PHC管樁的施工質量可控性遠高于鉆孔灌注樁,對周邊環境的負面影響也遠小于鉆孔灌注樁。 Abstract:The differences between the bored piles and PHC piles in performance price patio, construction quality control and environment implication are compared, and the mechanical properties of PHC piles and bored piles are analyzed. In addition, differences of PHC piles and bored piles under the same axial bearing capacity in raw material cost and construction cost are also compared. The results show that in highway, railway, water conservancy and other related projects, replacing bored piles with PHC pile not only can save 25%~40% of the engineering cost, but improve quality control of construction and reduce the negative effect on the neighboring environment largely.
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