第二期_2012_《混凝土與水泥制品》雜志社

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第二期

石灰石粉作為混凝土礦物摻合料應用問題的探討

李化建，趙國堂，謝永江，譚鹽賓，易忠來

２０12年第2期

摘要

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摘??要：石灰石粉用作混凝土礦物摻合料還存在一些疑問，通過分析，探討了石灰石礦物摻合料和人工砂的區別、石灰石粉是否是惰性摻合料、石灰石粉對混凝土力學性能的影響以及石灰石粉對混凝土耐久性能的影響。Abstract:Therearesomedoubtsaboutlimestonepowderusedasmineraladmixtureinconcrete,throughtheanalysis,thedifferencebetweenlimestonepowderandartificialsand,whetherlimestonepowderisnon-activemineraladmixtureornot,theeffectoflimestonepowderonmechanicalpropertiesofconcrete,andtheeffectoflimestonepowderonthedurabilityofconcretearediscussed

混凝土外加劑在建筑工程中的應用

謝鳳國，白生銀

２０12年第2期

摘要

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摘要：從混凝土外加劑的種類及其基本性能方面，介紹了各類混凝土外加劑的應用范圍，提出了混凝土外加劑在應用的過程中應注意的幾個問題。 Abstract: Based on the varieties and basic properties of concrete additives, the application scope for concrete additives is introduced, and the attention problems on concrete additives during the application process are proposed.

淺析高層建筑大體積混凝土底板冬季施工技術

徐向華,瞿丹英

２０12年第2期

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摘要：針對高層建筑底板大體積混凝土冬季施工對工程技術人員、機械設備、施工人員以及施工技術的要求，從施工過程、冬季施工的技術措施及養護措施等方面進行了分析和探討。 Abstract: According to the requirements of mass concrete for high-rise building floor in winter construction to technical engineers, mechanical equipment, constructors and construction technology, the construction process, technical measures of winter construction curing measures are analyzed and discussed.

銹蝕鋼筋混凝土梁抗彎承載力的計算模型

陳靜，包華，戴益民

２０12年第2期

摘要

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摘要：基于銹蝕鋼筋混凝土梁中鋼筋與混凝土之間粘結應力退化的現象，結合鋼筋銹蝕后材料性能的劣化，對銹蝕鋼筋混凝土梁抗彎承載力進行了研究。依據材料劣化后梁的截面平衡方程, 引入粘結影響因子得到新的變形協調條件，將銹蝕后粘結力對抗彎承載力及破壞形式的影響劃分為四個銹蝕階段，建立了銹蝕后鋼筋混凝土梁抗彎承載力的計算模型，并利用該模型對比驗證了已有試驗梁的試驗數據。結果表明，模型計算結果與試驗結果吻合較好，說明計算模型有良好的工程實用價值 Abstract: Based on the phenomenon of the bonding stress degradation in corrosion reinforced bar concrete beams, combining the material deterioration after steel bar corrosion, the flexural bearing capacity of corrosion reinforced concrete beams is investigated.?Under the introduction of the new bonding deformation compatibility condition, equilibrium equations are utilized to analyze the characteristics of corrosion reinforced concrete beams. The effects of bonding stress on the flexural bearing capacity and damage forms are divided into four stages of corrosion, the calculation model of the flexural bearing capacity of reinforced concrete beams are established and the test data of beams are validated using the comparison of the model. The results show that the model agrees well with the experimental results, which is expected that the calculation model has good practical value.

關于磚混結構震害預測方法的探討

唐月，李玉榮，蔡康鋒

２０12年第2期

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摘??要：通過一棟三層辦公樓實例，對常用的磚混結構震害預測方法進行了對比與分析，提出了較為科學和實用的預測方法，為城市防災減震規劃設計的科學決策提供了理論依據。 Abstract:Anexampleofthree-storeyofficebuildingisusedtocompareandanalyzeusualmethodsforseismicdamagepredictioninbrick-and-concretecompositeconstruction.Ascientificandpracticalforecastmethodisproposedtobehelpfulforthescientificdecision-makinginurbanplanningofdisasterpreventionandearthquakereduction.

混凝土自保溫砌塊墻體熱工性能檢測研究

宋巖麗

２０12年第2期

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摘要：介紹了混凝土自保溫砌塊墻體熱工性能判定的兩種方法—直接法和間接法。重點闡述了間接法計算外墻傳熱阻、平均傳熱系數的方法和過程。并以工程為例，說明了外墻平均傳熱系數的計算思路和計算方法。 Abstract: Two ways to measure the thermal performance of the wall of concrete self thermal insulation blocks—direct and indirect ways are introduced. The method to calculate the heat transfer resistance and the average transfer coefficient（Km） of the external walls by indirect way is mainly introduced. Taking some projects for examples, the thought and method to calculate average heat transfer coefficient of external walls are further explained.

?；⒅楸厣皾{配合比的正交試驗研究

陳曉莉，呂淵

２０12年第2期

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摘要：通過正交試驗，研究了膨脹珍珠巖與?；⒅閺秃瞎橇?、粉煤灰、聚丙烯纖維和引氣劑對保溫砂漿的物理、力學性能以及保溫性能的影響。用膨脹珍珠巖與?；⒅榘催m宜比例配合組成復合骨料來制備保溫砂漿，可有效改善骨料顆粒級配，降低砂漿的干密度，提高強度。摻加粉煤灰，不僅可降低砂漿的干密度，而且可有效降低成本。在砂漿中摻入聚丙烯纖維可有效提高砂漿的抗折強度。引氣劑的摻入可以進一步降低砂漿的干密度，改善其保溫性能，同時也可提高砂漿的流動性 Abstract：Through the orthogonal experiments, the influences of expanded perlite and glazed hollow bead composite aggregates, fly ash, polypropylene fiber and air-entraining agent on physical and mechanical properties and thermal insulation properties of thermal insulation mortar are studied．The thermal insulation mortar which prepared by expanded perlite and glazed hollow bead according to the appropriate proportion, can effectively improve the aggregate particle gradation, reduce the dry density of mortar, and increase the strength. By adding the fly ash, it not only can reduce the dry density of the mortar, but also can effectively reduce the cost. Adding polypropylene fiber in mortar can effectively improve the flexural strength of mortar. Adding air-entraining agent can further reduce the dry density of mortar, improve the heat preservation performance, and improve the liquidity of mortar.

鋼纖維和膨脹劑復合效應對噴射混凝土彎曲韌性的影響分析

趙曉晶，馬芹永

２０12年第2期

摘要

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摘要：基于韌性在混凝土結構中的重要性，采用三分點加載的方式，探討了膨脹劑和鋼纖維的復合效應對噴射混凝土彎曲韌性的影響規律。結果表明，當鋼纖維和膨脹劑的摻量分別為1.2%和8%時，噴射補償收縮鋼纖維混凝土的荷載-撓度曲線最為飽滿；彎曲韌度指數和承載能力變化系數均大于理想彈性材料的相應值。 Abstract：Based on the importance of toughness in concrete structure, using the method of three-point loading, the effecting laws of the combined effect of expansive agent and steel fiber on flexural toughness of shotcrete are discussed. The results show that the load-deflection curve of shrinkage-compensating steel fiber reinforced shotcrete is finest when the steel fiber content is 1.2% and expansive agent content is 8%. And the flexural toughness index and the coefficient of loading capacity variation are both bigger than the values of ideal elastic materi

聚乙烯醇纖維泡沫混凝土的性能試驗

鄧均，霍冀川，宋言紅，高銀，趙星，劉煦

２０12年第2期

摘要

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摘??要:利用實驗室自制的蛋白類發泡劑，以普通硅酸鹽水泥為結合劑，制備了粉煤灰-水泥基泡沫混凝土。探討了聚乙烯醇纖維不同長度、摻量對表觀密度為700～800kg/m3的泡沫混凝土吸水率、抗壓抗折強度、劈裂抗拉強度、收縮率的影響。結果表明，聚乙烯醇纖維可顯著增強泡沫混凝土的抗折強度，當纖維長度為12mm、體積率為0.23%時，28d抗折強度增大了43.24%；纖維體積率0.08％時，纖維長度為6mm的泡沫混凝土抗壓抗折強度最高。Abstract:TakingordinaryPortlandcementascombineagent,theflyash-cementfoamedconcreteispreparedwithlaboratorymadeproteinfoamingagent.Theeffectsofpolyvinylalcohol(PVA)fiberwithdifferentlengthsandcontentsonthewaterabsorption,compressiveandflexuralstrength,splittingtensilestrengthandshrinkagerateoffoamedconcretewithapparentdensityof700～800kg/m3areinvestigated.TheresultsshowthatPVAfibercansignificantlyenhancetheflexuralstrengthoffoamedconcrete.Whenthevolumerateof12mmfiberis0.23%,theflexuralstrengthat28daysincreases43.24%,andwhenthefibervolumerateis0.08%,thecompressiveandflexuralstrengthof6mmfiberfoamedconcretearethehighest.

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

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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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