第三期_2012_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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第三期

废旧橡胶改性水泥基材料的研究进展

马海峰，袁江，韩云阁，张亚梅

２０12年第3期

摘要

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摘要：综述了国内外废旧橡胶改性水泥基材料的现有研究成果。分析了废旧橡胶改性水泥基材料未能得到广泛应用的原因，并指出了今后研究的方向。现有研究成果表明，掺入橡胶颗粒取代部分集料可以有效提高水泥基材料的抗冻性和抗渗性，成倍提高混凝土的弯曲疲劳寿命，同时使抗裂性、抗冲击性能也得到改善。此外，橡胶混凝土应用到结构构件中能提高结构的延性及耗能能力。 Abstract: The current research achievements of cement-based materials containing scrap rubber at home and abroad are summarized. The reasons why the cement-based materials containing scrap rubber is not applied widely are analyzed, and the future research direction is pointed out. Literatures show that the additive composition of scrap rubber replacing a part of mineral aggregate can improve the frost resistance and impermeability of the cement-based materials efficiently, increase the bend fatigue life of the concrete remarkably and enhance the crack resistance and impact resistance of concrete. Furthermore, rubberized concrete applied in the structural member can improve the ductility and energy dissipation capacity of the structure.

自燃煤矸石活性对水泥砂浆性能的影响

孙志华，刘开平，汪敏强，王柱命

２０12年第3期

摘要

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摘要：利用X-射线荧光光谱仪、X-射线衍射仪以及强度法对自燃煤矸石的活性进行了研究，将自燃煤矸石部分替代水泥制备成水泥砂浆，研究自燃煤矸石活性、用量对水泥砂浆性能的影响。结果表明，煤矸石中在自燃过程中形成的活性物为α-石英、无定形SiO2、κ-Al2O3和无定形Al2O3。自燃煤矸石的疏松程度会影响其活性；晶相结晶度的高低决定自燃煤矸石活性的高低；自燃煤矸石活性越高，其水泥基复合材料体系强度越高。 Abstract: The activation properties analysis of spontaneous combustion coal gangue is studied after selecting, crushing, milling and sieving by X-ray fluorescence spectrometer(XRF), X-ray diffraction （XRD） and method of intensity, and using spontaneous combustion coal gangue partly replacing cement to prepare cement mortar, the effects of activation properties and dosages of spontaneous combustion coal gangue on properties of cement mortar are investigated. The results indicate that the active substance of spontaneous combustion coal gangue are ??quartz, amorphous SiO2, amorphous Al2O3 and Al2O3. The activation properties of spontaneous combustion coal gangue are affected by the crystallization rate of crystal phase, and the activation properties is affected by the structure loose ratio. The strengths of cement-based compound materials are increased with the activation properties of spontaneous combustion coal gangue heightened.

冷却塔环形承台基础大体积混凝土跳仓法施工技术

李福恩，岳鹏威

２０12年第3期

摘要

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摘要：以某发电厂双曲线自然通风冷却塔工程环形承台基础施工为例，介绍了大体积混凝土跳仓法施工的技术要点。同时给出了混凝土配合比、温度控制措施以及施工缝做法，解决了大体积底板因混凝土收缩应力及水泥水化热作用而出现的裂缝问题。 Abstract：Taking one power plants hyperbolic natural ventilation cooling tower engineering ring elevated pile caps foundation construction as an example, the technical key points of mass concrete concreting sequence method construction are introduced. The concrete mix proportion, temperature controlling methods and construction joint practice are pointed out to solve the mass slab crack problem resulting from concrete shrinkage stress and cement hydration heat.

石膏砌块新型空间夹具开发

黄晓光

２０12年第3期

摘要

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摘要：根据现有石膏砌块成型机空间夹具的运行情况，分析了生产过程中存在的问题，研制开发了新型的石膏砌块空间夹具和电气控制系统，提高了生产效率，保证了产品质量。 Abstract: According to the operating situation of space clamp of current gypsum block forming machine, the problems during the producing process are analyzed. The new space clamp of gypsum block and electric control system are researched and developed, which can improve the production efficiency and ensure the product quality.

节能保温轻型抗震房屋的防火措施

王德明，倪修全，吴月月

２０12年第3期

摘要

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摘要：针对节能保温轻型抗震房屋的研究现状，对框架、墙体、楼板三方面进行了综合分析，从材料、技术方面提出了相应的防火处理措施，强调了结构整体防火的重要性。 Abstract: For the research status of light energy efficient thermal insulation anti-seismic buildings, there is a comprehensive analysis on the frame, wall and floor, and the corresponding fire prevention measures from the materials and technology aspects are proposed. The importance of whole structure fire prevention is emphasized.

粉煤灰对砂浆性能影响的研究

陈军超，陈军磊，全卫峰，邱晓磊

２０12年第3期

摘要

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摘要：在砂浆中加入粉煤灰，不但能降低砂浆的成本，而且还能够改善砂浆的施工性能、提高砂浆保温性能。在满足加气混凝土（泡沫混凝土）抹面砂浆粘结强度高、收缩率低的前提下，粉煤灰掺量30%时，所配制的砂浆导热系数为0.1953W/m·K，与加气混凝土（泡沫混凝土）砌块导热系数接近，具有良好的保温效果。 Abstract: Adding fly ash into mortar can not only save costs of mortar, but also improve the workability and heat preservation performance of mortar. To meet the premise of high adhesive strength and low shrinkage of the aerated concrete (foamed concrete) surface mortar, the thermal conductivity of prepared mortar is 0.1953W/m?K when the content of fly ash is 30%, which is near the thermal conductivity of the aerated concrete (foamed concrete) block, and it has good heat preservation effect.

带约束拉杆矩形钢管混凝土短柱承载力计算

李华钢，蔡健

２０12年第3期

摘要

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摘要：采用带约束拉杆矩形钢管混凝土的本构关系，利用纤维模型法对带约束拉杆矩形钢管混凝土短柱承载力进行了数值分析，计算结果与试验结果吻合良好。利用经试验结果验证的计算程序对带约束拉杆矩形钢管混凝土短柱轴压和单、双向偏压承载力进行了较系统的参数分析，回归出带约束拉杆矩形钢管混凝土轴压和单、双偏压承载力简化计算公式，公式的计算精度高，形式简单，便于应用，可供工程设计参考。 Abstract: Fiber model method is adopted to calculate the bearing capacity of rectangular concrete filled steel tube (CFT) stub columns with binding bars and the constitutive relationship of rectangular CFT with binding bars is employed in the numerical analysis. The numerical results are in good agreement with the experimental ones. The parameters analysis of the bearing capacity of the CFT stub columns subjected to axial, uniaxial and biaxial eccentric loading are performed by using verified programs through experimental results. Simplified formulas for axial and eccentric bearing capacity of rectangular CFT stub columns with binding bars are presented by regression, which have high accuracy, simple expression and can be useful as references to the design of relational projects.

纤维复掺对干混砂浆性能的影响研究

刘煦，霍冀川，邓跃全，董发勤

２０12年第3期

摘要

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摘要：研究了玄武岩纤维、聚乙烯醇纤维、聚丙烯纤维单掺及复掺对砂浆抗渗抗裂性能、吸水率、抗压抗折强度、线膨胀率的影响。结果表明，纤维能提高砂浆的抗渗抗开裂性能，降低砂浆吸水率，提高砂浆柔韧性，产生一定的膨胀以抵抗砂浆的内部收缩。纤维增强干混砂浆，复掺比单掺效果好。单掺时，增强效果为聚乙烯醇纤维>玄武岩纤维>聚丙烯纤维；复掺时，玄武岩纤维:聚乙烯醇纤维:聚丙烯纤维=1:0:2时，砂浆的抗渗抗裂性能及力学性能达到最佳。 Abstract: The influences of multi-mixing basalts fibers (BF), polyvinyl alcohol fiber (PVA) and polypropylene fiber (PPF) on impermeability, anti-cracking, water absorption, compressive strength, flexural strength, linear expansion rate of the mortar are investigated. The results show that fiber can improve the impermeability, anti-cracking and flexibility, reduce the water absorption of mortar, and resist internal shrinkage of mortar by producing certain expansion. Meanwhile, the properties of mortar is better reinforced with fibers multi-mixed than only mixed, and when fibers only-mixed, enhancing effect: PVA>BF>PPF. However, the impermeability, anti-cracking and mechanical properties of mortar reached optimum when BF: PVA: PPF=1:0:2.

循环荷载作用下混凝土塑性变形试验研究

周洪涛，彭刚，胡海周，梁春华

２０12年第3期

摘要

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摘要：研究了循环荷载作用下普通混凝土和钢纤维含量为2.0%的混凝土圆柱形试件，在应变速率为10-5/s、10-4/s、10-3/s时的卸载点应变与累积塑性应变的关系。试验结果表明，在开始卸载点的应变值相同的情况下，钢纤维含量相同的混凝土提高应变速率会增加混凝土的累积塑性应变；在混凝土中添加适量的钢纤维能延缓混凝土在加载后期的破坏；高应变速率会加快混凝土材料的累积塑性应变增长。Abstract:Thenormalconcreteand2%steelfiberreinforcedconcrete（SFRC）ofthecylinderconcretearetested,andtherelationshipofthestrainofunloadingpointandaccumulatedplasticstrainarestudiedwiththreekindstrainrates:10-5/s,10-4/sand10-3/s.Thetestsresultsshowthatatthesamestrainofunloadingpointlevel,theaccumulatedplasticstrainofSFRCisincreasedwiththeincreaseofthestrainrateswhenthecontentsofsteelfiberarethesame.Itshowsthataddingpropersteelfibercandelaythedamageofconcreteatlaterloadingage,andhighstrainratecanpromotethegrowthoftheaccumulatedplasticstrainofconcrete.

浅谈管桩新旧标准对比

张强

２０12年第3期

摘要

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摘要：对比分析了10G409《预应力混凝土管桩》与03SG409《预应力混凝土管桩》和GB13476-2009《先张法预应力混凝土管桩》与GB13476-1999《先张法预应力混凝土管桩》新旧标准之间的差异；并以管桩400（95）AB桩型为例，采用新标准详细计算了混凝土管桩的有效预压应力、抗裂弯矩、抗裂剪力、桩身轴心受压承载力、桩身轴心受拉承载力。 Abstract: The standards of piles between the new and the old（10G409《prestressed concrete piles》and 03SG409《prestressed concrete piles》, GB13476-2009《Pretensioned spun concrete piles》and GB13476-1999《Pretensioned spun concrete piles》）are compared, and their differences are analyzed deeply. In addition, taking 400 (95) AB pile as an example, some mechanical calculations of concrete piles such as the effective prestressed stress, anti-cracking bending moment, anti-cracking shear, axial compression capacity and axial tensile capacity of pile body are listed in details using the new standard.

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