第十期_2013_《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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第十期

尾矿砂PVA水泥基复合材料抗压和抗弯性能试验研究

鲍文博，张少峰，曲利辉，底高浩

２０13年第10期

摘要

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摘要：研究了在不同尾矿砂替代率、纤维掺量和纤维长度对尾矿砂水泥基复合材料的增强和增韧作用。试验验结果表明，尾矿砂替代PVA水泥基复合材料中的细骨料工作性能和基本力学性能稳定，制备工艺满足要求；在纤维长度和掺量一定时，尾矿砂替代率为50%效果较好；纤维长度为12mm，掺量为26kg/m3时，PVA可以使尾矿砂PVA水泥基复合材料的延性明显增强。 Abstract: The different replacement ratio of tailing sand to cement as well as the reinforced and toughening roles of content and length of fiber in the cement-based composites with tailings sand are studied. The test results show that using tailing sand to replace PVA cement-based composites as fine aggregate, the workability and basic mechanics performance of the mixture is stable and can meet the requirements of the preparation technology; when the replacement ratio of tailing sand is 50% and the length and content of PVA fiber are fixed, the properties of the mixture are much better; when the length of PVA fiber is 12mm and the content of PVA fiber is 26kg/m3, the ductility of the tailing sand and PVA cement-based composites with tailing sand can significantly enhance.

石英岩煤矸石人工砂代替河砂配制砂浆性能试验研究

吕晶，李晓光

２０13年第10期

摘要

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摘要：为研究石英岩煤矸石人工砂替代河砂配制砌筑砂浆的可行性，对陕北某煤矿所排出石英岩煤矸石破碎制得人工砂替代河砂配制砌筑砂浆的拌合物性能和力学性能进行试验研究。研究结果表明，煤矸石破碎过程中产生的细粉可以作为惰性填料掺入砂浆；掺入水泥用量20%的煤矸石细粉可改善砂浆拌合物和易性，同时可提高砂浆的立方体抗压强度和轴心抗压强度；用50%石英岩煤矸石人工砂替代河砂时，砂浆分层度最小，70%替代河砂时轴心抗压强度和弹性模量均达到最小值。 Abstract：The workability and mechanical behaviors of the mortar prepared with artificial sand made by breaking quartzite gangue from coal mine in Northern of Shaanxi is studied in order to investigate the feasibility of masonry mortar prepared with quartzite gangue (artificial sand) broken to replace the river sand. The study shows that the coal gangue powder produced by the fragmentation technology can be added into the mortar as insert filler; the workability of the fresh mortar can be improved by mixing with coal gangue powder at 20% of the cement content, while the compressive strength and axial compressive strength of the cube specimens are also increased. The coursing degree of mortar is minimum when 50% of the quartzite gangue replaces river sand, and the axial compressive strength and elastic modulus of the specimens can be minimum value when the replacement ratio of the quartzite gangue is 70%.

拉法基某工程项目基础混凝土裂缝原因分析及对策

国卫生

２０13年第10期

摘要

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摘要：拉法基瑞安重庆永川水泥生产线项目地质状况及施工条件比较复杂，在部分基础和垫层以下填充混凝土工程施工过程中出现了裂缝现象。分析了本工程出现裂缝的原因，阐述了使裂缝得到有效控制所采取的一系列措施。 Abstract： Because the geological condition and construction condition of Lafarge Chongqing Yongchuan cement production line project are complicated, some parts such as the part foundation or under the cushion layer had the cracks during the construction process of filling the concrete. For solving the problem, the causes of cracks are analyzed, and some measures for controlling the cracks are put forward.

滑模施工技术在超高变径混凝土烟囱中的应用

夏晋华1，王守剑2

２０13年第10期

摘要

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摘要：以河南某电厂180m钢筋混凝土结构烟囱施工过程为例，根据高耸烟囱结构特点，筒体采用无井架液压滑模施工工艺，为了降低工程事故，滑模操作平台采取整体拆除法，缩短了拆模时高空作业时间，克服了传统工艺分散拆模法的诸多风险和安全隐患。 Abstract: Taking the construction process of 180m reinforced concrete structure chimney of a power plant in Henan as an example and according to the characteristics of high chimney structure, the construction technology of hydraulic sliding formwork without headframe is chosen for the barrel construction. The sliding operation platform uses the overall demolition method in order to reduce engineering accidents. The method can shorten the aerial work time when the formwork is removed and overcome many risk and hidden danger of disperse mould removal method.

混凝土顶升法施工技术研究

金花1，李晓飞2，孙立功1

２０13年第10期

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摘要：结合抚顺皇家海洋世界跨线桥110m提篮式双曲钢管混凝土拱施工，介绍了顶升法泵送混凝土的施工和质量控制方法；并依据混凝土顶升的施工原理、顶升压力，分析了影响因素，改进了混凝土配合比；采取设置止回装置和排气溢流孔等方法，解决了钢管拱混凝土一次顶升的难题。 Abstract: Combining with the construction of the Royal Fushun ocean world overpass 110m double steel pipe concrete vault with basket type, the lift-up pump concrete construction and a quality control method of concrete are introduced. And according to the principles of concrete lift-up construction, lift-up pressure, some relative influence factors are analyzed and mix proportion of concrete is optimized; in addition, using the methods of setting non-return devices, exhaust overflow orifice, etc. can solve the once lift-up problem of steel tube arch concrete.

波形钢腹板连续组合梁桥横梁加固设计研究

任大龙1,2，万水1

２０13年第10期

摘要

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摘要：通过结构计算分析了波形钢腹板组合箱梁桥横梁，针对横梁裂缝宽度超限、承载能力不足的问题，提出增设预应力钢束和增加特殊支座及预应力钢束的两个加固方案。对横梁加固方案进行了计算，分析加固横梁应力和抗裂性指标，分析结果表明，横梁加固方案二从根本上解决了横梁存在的问题。最后从计算结果、施工难度与工作量、钢束锚固等因素考虑，选取了增加特殊支座及预应力钢束的横梁加固方案。 Abstract: The beams of composite box girder bridges with corrugated steel web are analyzed by the structure calculation, and according to crack width overrun of the beam and insufficient bearing capacity, the reinforcement schemes of adding prestressed steel beam or adding special bearings and prestressed steel beam are put forward. Meanwhile, the reinforcement schemes for the beam are calculated, and the indexes of stress and crack resistance of the reinforcement beams are analyzed. The results show that the reinforcement schemeⅡ can radically solve all the problems of the beam. In addition, considering some factors such as the calculation results, construction difficulty, workload, steel beam anchorage, it’s suggested that the schemes of adding special bearings and prestressed steel beam should be selected.

设门洞的加气混凝土砌体芯柱组合墙抗震性能分析

吴会阁1，赵彦2，曹秀玲1，谌会芹1

２０13年第10期

摘要

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摘要：运用ABAQUS有限元分析软件对设门洞的加气混凝土砌体芯柱组合墙进行了数值模拟，研究其抗震性能。在有限元模型的计算结果与先前足尺试件的试验结果进行了对比验证的基础上，研究了竖向正压力、洞口设置的大小及位置三因素对墙体抗震性能的影响。研究表明：随竖向压应力的增加，墙体的抗震性能得到改善；但竖向压应力对极限荷载的影响小于对极限荷载下位移的影响；门洞宽度增大时，墙体的极限承载力降低，降低程度与墙体截面积的削弱程度基本成比例；门洞位置的改变，对墙体抗震性能的影响较小。 Abstract: In order to study the seismic performance of aerated concrete block masonry composite wall with a door opening，numerical simulation was conducted by using finite element software ABAQUS. The finite element results were verified with the laboratory results of full-scale specimens. On this basis, the composite walls with different parameters were investigated, which includes their vertical compression stress, opening sizes and opening position. The results show that with the increasing of vertical compression stress，the seismic performance improve；however, the effect of the vertical compression stress on the ultimate load is less than that on the displacement under ultimate load；With the increasing of the door width, the decrease in the wall’s bearing capacity is proportional to the decrease in the wall’s net area; and the change of door’s position has less effect on seismic performance of the composite wall.

钢筋自密实混凝土梁受剪性能试验研究及分析

孙锐 1，叶燕华1,2，薛洲海1，孙含笑1

２０13年第10期

摘要

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摘要：自密实混凝土工程应用逐渐增多，为研究钢筋自密实混凝土梁的受剪性能，进行了4根钢筋自密实混凝土梁试件和2根普通钢筋混凝土梁试件的试验，研究自密实混凝土梁受剪性能的破坏形态、开裂荷载、裂缝发展和抗剪承载力，并且将其与普通钢筋混凝土梁作对比分析。将试验值与GB 50010—2010《混凝土结构设计规范》计算的理论值与相比较。结果表明，竖向集中荷载作用下，钢筋自密实混凝土梁与普通钢筋混凝土梁有着相似的破坏特征与承载能力。钢筋自密实混凝土梁理论值与试验值的比为0.59，比普通钢筋混凝土梁理论试验值的比值高出0.11。 Abstract: The engineering application of self-compacting concrete (SCC) is increasing. For studying the shear capacity of reinforced SCC beams, four SCC beams and two corresponding normal concrete beams were tested. Meanwhile the failure forms, cracking loads, crack developments and shear strengths of the SCC beam are studied by comparing with those of the normal concrete beam. In addition, the experiment results are also compared with theoretical value of GB 50010—2010 “Concrete Structure Design Code”. The results show that failure characteristics and capacity of the two kinds of beams are almost the same. The capacity ratio of experiment result to theoretical value of the SCC beam is 0.59, which has an increase of 0.11 than that of the normal beams.

纳米材料对玻化微珠保温混凝土性能的影响

霍建梅，李珠，王文婧

２０13年第10期

摘要

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摘要：通过单因素及耦合试验研究纳米SiO2（NS）和纳米CaCO3（NC）对玻化微珠保温混凝土坍落度及抗压强度的影响。NS以0.5%、1.0%、1.5%，NC以0.5%、1.0%、1.5%等量代替水泥，并对混凝土坍落度及7d、28d立方体抗压强度进行了测试。试验结果表明，S加入可显著提高混凝土的强度，且最佳掺量为1%，但不利于混凝土的流动性；NC的加入降低混凝土的强度，但改善了混凝土的流动性，且最佳掺量为0.5%。通过纳米矿物的合理复掺可制备出7d和28d立方体抗压强度分别为26.7MPa、42.4MPa，坍落度为145mm的玻化微珠保温承重混凝土。Abstract:Theeffectofnano-SiO2(NS)andnano-CaCO3(NC)onthecompressivestrengthandslumpofglazedhollowbeadinsulationconcretewasinvestigatedbysinglefactortestandcouplingtest.0.5%、1.0%、1.5%ofNSand0.5%、1.0%、1.5%ofNCwereaddedtopartialreplacecement.Theslumpoffreshconcreteand7d、28dcubecompressivestrengthweretested.ThetestresultsshowthataddingNScansignificantlyincreaseconcretestrengthandtheoptimumcontentis1%,butitisnotbeneficialtoflowabilityofconcrete;addingNCreducesconcretestrength,butimprovesflowabilityofconcrete,andtheoptimumcontentis0.5%.Glazedhollowbeadinsulationconcretewith7d、28dcubecompressivestrengthof26.7MPa、42.4MPaandslumpof145mmcanbemadebysuitableadmixtureswithnano-minerals.

纤维增强橡胶混凝土路用性能试验研究

赵素艳1，经冠举2

２０13年第10期

摘要

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摘要：采用等体积置换法，将橡胶粉分别按10%、20%、30%、40%、50%取代细集料配制橡胶混凝土，并通过不同掺量的纤维对其进行增强，分析并评价了橡胶混凝土的力学性能、耐磨性能以及抗冲击性能。试验结果表明：纤维增强橡胶混凝土的抗压强度较基准混凝土有大幅度降低，抗折强度以及劈裂强度明显增大；随着纤维和橡胶粉的掺入，混凝土的耐磨性能和抗冲击韧性均有所提高，且随着纤维掺量的增加而增大；当纤维掺量0.9kg/m3左右，橡胶粉体积掺量不超过40%时，混凝土性能最为优异。Abstract:Thekindofconcretewithdifferentcontentoffiberispreparedusingthevolumedisplacementmethodtoreplacefineaggregatebytherubberpowderof10%,20%,30%,40%,50%.Themechanicalproperties,wearresistanceandimpactresistanceofthefiberreinforcedrubberconcreteareanalyzedandevaluated.Theresultsshowthatthecompressivestrengthoffiberreinforcedrubberconcretesignificantlyreducecomparewithnormalconcrete,whiletheflexuralstrengthandsplittingstrengthofthefiberreinforcedrubberconcretesignificantlyincrease;addingfiberandrubberpowdercantheenhancewearresistanceandimpacttoughnessoftheconcrete,andthesepropertiesincreasewiththeincreasingcontentoffiber;Whenthefibercontentisabout0.9kg/m3,therubbercontentislessthan40%offineaggregate（volumecontent）,theconcreteperformanceisthebest.

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