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第十一期

稻壳灰混凝土的力学性能和耐久性研究
稻壳灰混凝土的力学性能和耐久性研究
  • 张 霄
2015年第11期
摘要
引用本文
摘 要:将稻壳灰等量部分替代水泥加入到混凝土中制备稻壳灰混凝土,并对稻壳灰混凝土进行7d和28d龄期的力学性能、抗冻性能、抗氯离子渗透性能和抗酸侵蚀性能的测试。结果表明,稻壳灰的加入能够显著地改善混凝土的内部结构,使其更加密实,从而增强了稻壳灰混凝土的力学性能、抗冻性能、抗氯离子渗透性能和抗酸侵蚀性能。当稻壳灰的掺量为20%时,混凝土的性能最佳,此时稻壳灰对混凝土的增强效果最好。 Abstract: The rice husk ash for same amout is added into concrete for preparing rice husk ash concrete. The mechanical properties at 7d and 28d, frost resistance, chloride penetration resistance and acid resistance properties of rice husk ash concrete are investigated. The results show that adding rice husk ash can improve the structure of concrete, which can finally enhance the mechanical properties, frost resistance, chloride penetration resistance and acid resistance properties. The maxmum properties of rice husk ash concrete is obtained with the 20% dosage of rice husk ash, at this time, the strengthending effects of rice husk ash on concrete is best.
废弃混凝土中硬化水泥浆体的再生实验研究
废弃混凝土中硬化水泥浆体的再生实验研究
  • 张慧勇,张新爱
2015年第11期
摘要
引用本文
摘 要:废弃混凝土中的硬化水泥浆体是资源、能源消耗最大、环境负荷最重、经济成本最高的部分,本文研究了硅酸盐脱水相的制备及其相关表征,研究表明,硬化后的水泥浆体在经过煅烧处理后能得到一种名为硅酸盐脱水相的物质,该物质遇水后能再次发生水化反应而得到具有强度的硬化结构体,其中以650℃煅烧温度下得到的硬化水泥浆体脱水相水化后强度最大。同时,还对硅酸盐脱水相-硅微粉系的性能进行了研究,为改善脱水相的强度,加入硅微粉进行了改性,发现加入硅微粉后有强度增加的趋势。 Abstract: The hardened cement paste in waste concrete is the part of the largest energy and resource consumption, the worst environmental impact and the most economic costs. The preparation of silicate dehydration phase and characterization are studied. The results show that a material called silicate dehydration phase can be obtained from the hardened cement paste after calcination, and rehydration hardening structure is obtained by adding silicate dehydration phase substance and water. The biggest rehydration strength of hardened cement paste dehydration phase is derived at 650℃. The research on performance of silicate dehydration phase-silica powder is studied. In order to improve the strength of dehydration phase, the modification for adding silica powder is carried out, the strength is improved after adding microsilica powder.
图解超长大体积混凝土结构施工关键技术
图解超长大体积混凝土结构施工关键技术
  • 吴龙生1,周 迅2,许 飞1,李 俊2
2015年第11期
摘要
引用本文
摘  要:泰州金融服务区二层地下室整体工程建筑面积约为18.68万m2,基础埋深为-19.50m,局部为-12.15m。以图示方法探讨了合理划分超长大体积混凝土结构施工区域(段)方法,归纳了跳仓法施工的具体步骤,分析了针对本工程特点采取的施工技术措施和组织措施,重点介绍了后浇带施工技术措施、施工缝处置技术措施、钢管混凝土柱浇筑方法、顶板混凝土防收缩裂缝措施,可为类似工程施工提供参考。Abstract:Thetwo-floor-undergroundbasementprojectofTaizhoufinancialservicecentrewitha-19.50meterembeddeddepthoffoundationand-12.15meterlocalburieddepthcoversanareaofabout186,800squaremeters.Illustratingasanimportantcarrier,thereasonabledivisionforconstructionareasofsuper-longconcretestructureconstructionisdiscussed,withasummaryoftheprocessesofthejumpwarehouseconstruction,measuresofconstructiontechnologyandorganizationalmeasuresofthisengeneeringareanalyzed,processesoftheconstructionofpost-caststrip,treatmentofconstructionjoints,thepreventionofroofconcreteshrinkagecrackandconcrete-filledsteeltubeareintroducted,whichcanprovidereferenceforprojects.
聚苯颗粒泡沫混凝土性能的影响因素研究
聚苯颗粒泡沫混凝土性能的影响因素研究
  • 权娟娟,马 斌
2015年第11期
摘要
引用本文
摘 要:研究了聚苯颗粒掺量为2400mL、2600mL、2800mL时各因素对泡沫混凝土性能的影响,确定了原料最佳配合比。结果表明,以比强度为考核指标时,最佳配合比为:水胶比0.65、泡沫掺量3500mL、聚苯颗粒掺量2800mL;以导热系数为考核指标时,最佳配合比为:水胶比0.55、泡沫掺量2500mL、聚苯颗粒掺量2400mL。孔结构分析表明,掺加聚苯颗粒泡沫混凝土的孔隙率增大和孔隙尺寸降低,都会明显提高其力学性能。 Abstract: The effects of various factors on properties of foam concrete are studied when polystyrene particles dosage is 2400mL, 2600mL and 2800mL, the best mix ratio of raw materials is determined. The results show that with the specific strength as assessment indicators, the best mixing ratio include that water/cement ratio is 0.65, foam dosage is 3500mL, polystyrene particles dosage is 2800mL; with the thermal conductivity as assessment indicators, the best mixing ratio include 0.55 water/cement ratio, 2500mL foam dosage, 2400mL polystyrene particles dosage. Pore structure analysis indicate that by adding polystyrene particles, porosity of foam concrete is increased and pore size of foam concrete is decreased, which can obviously improve its mechanical properties.
玄武岩纤维对膨胀珍珠岩-聚合物复合保温砂浆性能影响研究
玄武岩纤维对膨胀珍珠岩-聚合物复合保温砂浆性能影响研究
  • 孟 玮1,陈 蓓1,吴丽雅2
2015年第11期
摘要
引用本文
摘 要:通过正交试验方法对保温砂浆的性能指标进行了研究,得到初步配合比,在此基础上研究了玄武岩纤维的添加对复合保温砂浆性能的影响。结果表明,玄武岩纤维的掺入对复合保温砂浆试件的抗压强度、压折比有明显的改善效果,对材料的导热系数改善效果不明显。 Abstract: The research on performance index of thermal insulation mortar is carried out through orthogonal test method, preliminary mixture ratio is obtained, on the basis, the influence of adding basalt fiber on thermal insulation mortar is studied. The result shows that the effects of adding basalt fiber on compressive strength and crushing ratio of composite insulation mortar are obviously improved. However, improving effect on thermal conductivity of materials is not obvious.
新型泡沫混凝土轻质墙板外挂节点力学性能试验研究
新型泡沫混凝土轻质墙板外挂节点力学性能试验研究
  • 谷 倩,周 珣,舒 松,李 博
2015年第11期
摘要
引用本文
摘 要:外挂墙板在建筑结构中广泛应用,新型泡沫混凝土外挂墙板与框架的连接节点对这种结构的安全性及可靠度有重要的影响。为研究该连接节点的受力机理及破坏模式,对两种配合比的泡沫混凝土分别预埋两种不同形式的节点,对其进行节点抗弯试验以及节点抗剪试验研究,系统对比不同形式的连接节点以及不同配合比的泡沫混凝土墙板对节点承载力的影响,分析墙板在荷载作用下的裂缝开展情况以及荷载-位移曲线。试验结果表明:双面钢板节点有良好的承载力、节点破坏后于墙板本身破坏,能实现墙板与框架安全有效的连接;在预埋双面钢板节点情况下,无陶粒配合比的泡沫混凝土与预埋节点的协同工作性能优于陶粒配合比的泡沫混凝土。 Abstract:External precast wall panels are widely used in building structure, the connection node between the new foam concrete external precast wall panels and framework have an important impact on the safety and reliability. To study the force mechanisms and failure modes of connections node, different foam concrete with mix proportion are used by two different embedded forms of connection node, the investigation for bending and shearing test of connections is carried out. Compared with different forms of node and different mix proportion of foam concrete wall panel by system, which have effects on capacity of node, as well as cracks development of wall panels under loading and the load-displacement curve are analyzed. The results show that, duplex steel node has good capacity, node destroy itself after the damage of wall panels, safe and effective connection between wall panels and frame can be achieved; under the situation of embedded duplex steel node, the work performance of foam concrete with non-ceramic mix proportion and embedded node is better than foam concrete with ceramic mix proportion.
预应力碳纤维板锚固钢筋混凝土梁抗弯试验研究
预应力碳纤维板锚固钢筋混凝土梁抗弯试验研究
  • 郭 蓉1,2,吴二朋1,欧高龙1
2015年第11期
摘要
引用本文
摘 要:对3根梁进行了试验,一根为对比梁,一根为普通碳纤维板加固,一根为预应力碳纤维板加固,研究了碳纤维板对钢筋混凝土梁的加固效果。同时设计了一套较为可靠的张拉锚固设备,制定了一套较完整的张拉工艺。通过梁抗弯试验,对应变、挠度、承载力进行了研究。试验证明,加固梁的开裂荷载均有提高,但提高不明显,极限荷载提高幅度较大,且预应力碳纤维板加固梁较普通碳纤维板加固提高更多;在增加梁的刚度、降低延性发展方面,预应力碳纤维板加固效果更好;试验过程中碳纤维板未出现滑移,锚固效果良好,有效地延缓了碳纤维板的剥离破坏。 Abstract: The experiment of three beams which include a beam contrast, an ordinary carbon fiber reinforcement and a prestressed carbon fiber reinforcement, is carried out. The reinforced effect of carbon fiber slab on reinforced concrete beam is studied. At the same time, the tension anchor equipment is designed, and the complete tension technology is formulated. Through beam bending test, strain, deflection and capacity are studied. Experiment shows that cracking load of reinforced beam is increased, but not obvious, ultimate load increase is relatively improved, and prestressed reinforced concrete beams increases more than ordinary carbon fiber reinforced; in the aspect of increasing stiffness of the beam and decreasing ductility, reinforced effects of prestressed carbon fiber slab is better; slip does not occur during the experiment process, the anchor effect is good, which can effectively delay debonding failure of carbon fiber slab.
三维空间织物增强活性粉末混凝土薄板抗弯力学性能试验研究
三维空间织物增强活性粉末混凝土薄板抗弯力学性能试验研究
  • 惠 雷1,荀 勇2,徐业辉1,陈 贺3
2015年第11期
摘要
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摘 要:对应用了活性粉末混凝土(RPC)作为基体材料的薄板力学性能进行了研究,提出了织物增强混凝土(TRC)薄板研究的四点抗弯试验方法;进行了薄板抗弯力学性能研究,其中一组3个薄板由RPC直接现浇而成,另一组3个配置了空间间隔织物网,得到了增加空间织物网后的抗弯力学性能。 Abstract: Mechanical properties of thin plant for reactive powder concrete as based material is studied, four-point bending expeimental method of TRC thin plant is proposed, the mechanical properties of thin plant is carried out. One group for three thin plant is cast directly by RPC, another group for three thin plant is configured by spacer fabrics net flexural mechanical properties after increasing spacer fabrics net are obtained.
纤维筋混凝土的阻尼特性影响因素分析
纤维筋混凝土的阻尼特性影响因素分析
  • 李勋峰1,杜嘉雯2,姚 运3
2015年第11期
摘要
引用本文
摘 要:为保证建筑结构在震动中的安定性,对影响混凝土阻尼性能的因素进行了分析,考察了纤维筋混凝土纵向配筋率、筋材类型、箍筋间距和构件尺寸等因素对混凝土阻尼性能的影响。通过悬臂梁自由振动装置和三点弯曲梁式大尺寸材料阻尼测试装置对纤维筋混凝土阻尼比和损耗因子的测定,结果表明,阻尼比和损耗因子都可以表征混凝土构件的阻尼性能,纵向配筋率在0.9%以上时对混凝土阻尼性能影响不大,混凝土阻尼性能的提高随着箍筋间距的缩小和筋材表面粗糙度的增大以及加载频率的降低而增大,而构件尺寸则对混凝土阻尼性能影响不大。 Abstract: To ensure the stability of buildings structure in shocking, effecting factors of concrete damping property are analysed, the influence of longitudinal reforcement ratio of fiber reinforced concrete, reinforcing types, stirrup spacing and dimension of component on concrete damping property is studied. The damping ratio of fiber reinforced concrete and damage factor are tested by free vibration cantilever device and damping test device for three-point dynamic bending dimension material, the results show that the damping property could be characterized by damping ratio and loss factor, the damping property kept steady when longitudinal reinforcement ratio reaches 0.9%, damping property of concrete increases with decreased the stirrup spacing and increased the surface roughness, and decreased load frequency, dimension of component has little effect on damping property.
纤维橡胶骨料混凝土弯曲韧性关键影响因素研究
纤维橡胶骨料混凝土弯曲韧性关键影响因素研究
  • 史喜珍
2015年第11期
摘要
引用本文
摘 要:以弯拉应变和应变能密度为主要评价指标,研究了橡胶粉表面改性和掺量、纤维掺量、砂率和水灰比等因素对橡胶混凝土弯曲韧性的影响,并通过方差分析得出了影响弯曲韧性的关键因素。试验结果表明,橡胶粉表面改性能明显提高橡胶混凝土的弯拉应变和应变能密度,显著改善弯曲韧性;随着橡胶粉和纤维掺量的增大,弯拉应变和应变能密度呈现先增大后减小的变化规律,当橡胶粉掺量为10%,纤维掺量为1.0%时,弯曲韧性最好;当砂率小于0.32时,增大砂率能提高弯曲韧性,而当砂率大于0.32时,再增大砂率反而会使弯曲韧性降低;弯拉应变和应变能密度随水灰比的增大呈抛物线规律变化,当水灰比为0.39时,弯曲韧性最佳。 Abstract: Using flexural tensile strain and strain energy density as the main evaluation, the influence of rubber powder surface modification and content, fiber content, sand and cement ratio and water-cement ratio on flexural toughness of rubberized concrete is studied, and the key factors affecting the flexural toughness is obtained through analysis of variance. The results show that the flexural tensile strain and strain energy density of rubber concrete can increased obviously by rubber powder surface modification, and bending toughness is significantly improved; with the increasing of rubber powder and fiber content, the flexural tensile strain and strain energy density increase first, then decreases. When the rubber powder content is 10%, fiber content is 1.0%, the flexural toughness is the best; when the sand rate is less than 0.32, increasing sand rate can improve the flexural toughness, however, when sand ratio is more than 0.32, increasing sand rate decreases flextural toughness. With the increasing water-cement ratio, flexural tensile strain and strain energy density increase parabolic law changes, when water-cement ratio is 0.39, the bending toughness is the best.
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