第十期_2016_《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

掺建筑垃圾再生微粉混凝土性能试验研究

马郁

２０16年第10期

摘要

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摘要：研究了利用建筑垃圾再生微粉作矿物掺合料所配制的混凝土的各项性能。研究结果表明，建筑垃圾再生砂粉有一定的活性，其各项性能指标满足Ⅱ级粉煤灰要求，可作为混凝土矿物掺合料使用。利用建筑垃圾再生微粉配制的C30、C50混凝土，掺量在20%以下时，对混凝土各项性能影响不大，配制出的再生混凝土工作性能和耐久性能与基准混凝土相当。 Abstract: The properties of the concrete made from the construction waste recycled powder were studied. The results showed that, the construction waste recycled powder has certain activity, all its performance meet the requirements of grade II fly ash, it can be used as mineral admixtures. When the dosage is below 20%, the performance of the C20, C50 concrete that made from the construction waste recycled powder have no change and its durability is almost the same as the reference concrete.

铁尾矿植生基质的无侧限抗压强度试验研究

鲁明星1，李富平2

２０16年第10期

摘要

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摘要：为有效利用堆积的铁尾矿，以铁尾矿、水泥、秸秆、pH值调节剂等配制植生基质喷播到裸露的岩质边坡。研究了水泥掺量、pH值调节剂剂量为影响因素配制的植生基质的无侧限抗压强度随着龄期的变化规律。通过对试验数据的分析可知，当水泥掺量为6%时，植生基质的强度可以满足工程要求；无侧限抗压强度随pH值调节剂剂量的增加而降低；植生基质加入6%的pH值调节剂和8%的水泥时，14d龄期时的抗压强度迅速增加。 Abstract: In order to make full use of the packed iron tailings, iron tailings, cement, straw and pH regulator were used to prepare planting material sprayed on the slope of the exposed rock. Based on the influencing factors of the cement content and pH regulator dosage, this research aims to study the change law of the unconfined compressive strength with the change of its age. The results showed that, when the cement content is 6%, the strength of planting material can meet the engineering requirement. With the pH regulator dosage increases, the unconfined compressive strength reduces. When 6% and 8% of pH regulator dosage and cement added into the planting material respectively, the unconfined compressive strength increases quickly in 14d.

水泥复合改性淤泥基材料的性能研究

刘志华1，马军涛2，杨久俊1，张磊1

２０16年第10期

摘要

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摘要：使用水泥、石灰、矿粉等掺合料对黄河淤泥进行复合改性，测试了不同改性剂、水灰比和成型方式对淤泥试件抗压强度的影响，使用XRD衍射分析研究改性前后物相的变化，使用SEM扫描电镜观察改性前后形貌的变化。结果表明，使用水泥作为改性剂可显著改善淤泥试件的强度，加压成型的淤泥试块强度可达到浇筑成型试件的五倍以上。 Abstract: Compound modification by adding cement, lime, slag and other admixture into Yellow River silt, the influence of different modification agent, water cement ratio and forming method on the compressive strength of the silt specimen was analyzed. Using XRD and SEM to study the change of phase and morphology before and after compound modification. The results showed that, using cement as the modification agent can significantly improve the strength of the silt specimen, the silt specimen strength compression formed can reach more than five times of the pouring formed.

C45基础大体积混凝土施工质量控制研究

吕俊杰1，崔庆怡2

２０16年第10期

摘要

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摘要：结合实际工程，对超高层建筑底板施工过程中粗钢筋定位、电梯基坑处理、大体积混凝土浇筑、底板顶面施工方法等进行了叙述。施工过程中采用电子测温仪及计算机网络监控技术，对大体积混凝土温度变化及后期养护进行了实时监控，取得了满意的效果。 Abstract: Based on a real project, the thick steel bar positioning, the elevator foundation pit treatment, the mass concrete pouring, the top floor construction of the floor construction process of super high rise building are summarized. Electronic temperature measuring instrument and computer network monitoring technology are used in the construction process, the temperature change of mass concrete and the maintenance of the later period are monitored in real time, and the result is good.

桥梁箱梁支架地基变形性状试验研究

朱翔1,2，郭院成1，侯思强1

２０16年第10期

摘要

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摘要：依据郑东新区高支模架现场试验结果，对地基土土压力及变形进行了监测，结合数值模拟及分层总和法理论计算结果对比高支模架不同位置的土压力与地基土变形，分析三者之间的数值差异，并对差异原因进行了分析，提出了在实际工程中应考虑应力集中保证一定的安全系数的观点，为高支模板及后续现浇结构设计施工提供了实测依据。 Abstract: Based on the field test results of high scaffolding in Zhengdong New Area, foundation pressure and deformation were monitored. Combined with the results of numerical simulation and layerwise summation method, the results of high scaffolding for different positions of earth pressure and soil deformation were compared, numerical difference and cause of the three were analyzed. The results showed that, considering the stress concentration and using safety factor in the practical construction work can provide experimental basis for high scaffolding and subsequent cast-in-situ concrete structure design and construction.

拉伸黏结强度试验用切割装置及试验方法的改进

冯长伟，苏晋鹏，顾建平，金志华

２０16年第10期

摘要

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摘要：发明了一种新型的拉伸黏结强度试验专用切割装置，对传统的切割方式和拉伸黏结强度试验方法进行了改进。结果表明，新切割装置相对传统切割工具更具效率和精度，切割精度可控在0.5mm。新切割装置和试验方法更具实用性，可对保温装饰板、复合板以及真空绝热板抹面层等复杂系统进行切割试验，效果较好；该装置和方法可应用在保温层与基层、保温层与抹灰层(装饰板) 以及抹灰层与基层的拉伸黏结强度试验中。使用新切割装置能保持切割样品的一致性和均匀性，保温层（或抹灰层）的内部结构不会因为切割而损坏，?覫50mm的粘贴铁块不易出现翘边和不平整等现象，这些优点使得后续的拉伸黏结强度试验结果更为真实可靠。 Abstract: By improving the traditional way of cutting and tensile strength test method, a new type of tensile strength of special cutting device is invented. The results show that the new cutting device is more efficiency and accuracy compared with the traditional cutting tools, and the cutting accuracy can be controlled in the 0.5mm; the new cutting device can be used to take the cut tests of complex systems such as some thermal insulation decoration board, composite board and vacuum insulation panel, and the effect is good; the new cutting device and method can be used in the tensile bond strength tests of insulation layer and the base layer, the insulating layer and the plaster layer (trim) and plastering layer and base layer. Using new cutting device can maintain consistency and uniformity of the cutting sample, the internal structure of thermal insulation layer (layer or plaster) will not be damaged, because cut of ?覫50mm paste such as iron is not easy to become warped edge and uneven phenomenon. Based on the advantages on bonding strength, the follow-up test results is more reliable.

石膏基氯氧镁复合改性材料的研究

李文斌，冯启彪，王音璇，杨雷俊

２０16年第10期

摘要

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摘要：基于石膏和氯氧镁胶凝材料进行了复合改性研究，通过对试件硬化体微观晶体形貌的观测，分析了石膏-氯氧镁系复合气硬性胶凝材料改性的作用机理。结果表明，石膏-氯氧镁系复合气硬性材料在适宜的配比下可以制作凝结时间适宜、耐水性好、强度高以及干燥收缩率低的新型胶凝材料。 Abstract: Based on the compound modification research on the cementitious material of gypsum and magnesium chloride, by the observation of the microstructure of the hardened specimens, the modification mechanism of the gypsum magnesium chloride composite air hardening cementitious materials was analyzed. The results showed that, a new gel material with appropriate setting time, good water resistance, high strength and low drying shrinkage can be produced by the air hardening composites when a proper ratio of gypsum to magnesium oxychloride is prepared.

矿物掺合料复掺对墙板胶黏剂拉伸黏结性能影响研究

甄海锋，郭文瑛，莫庭威，吴晨浩，左金懿，王宣，刘金聚

２０16年第10期

摘要

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摘要：随着建筑工业化的发展，预制混凝土墙板的使用越来越广泛。墙板胶黏剂用于预制混凝土墙板的拼接和黏结，当墙板胶黏剂拉伸强度较小时，容易产生裂缝等问题。为改善胶黏剂拉伸强度，本文在原有的研究基础上研究了滑石粉、矿粉、偏高岭土三种矿物掺合料复掺对墙板胶黏剂拉伸黏结强度的影响。正交试验结果表明，滑石粉和矿粉可以有效改善胶黏剂的拉伸黏结强度。偏高岭土掺量过大会影响其拉伸强度。由优化试验可知矿粉和滑石粉复掺最佳掺量分别为20%和30%。 Abstract: With the development of construction industrialization, precast concrete panels are applied more and more widely. Panel adhesive is used for assemblage and binding the precast concrete panels. When its tensile strength is not high enough, it will cause problems like cracking. In order to improve its tensile strength, the influence of mixing talc powder, slag powder and metakaolin on the tensile bond strength of panel adhesive were studied based on previous research. The orthogonal experiment results showed that, adding talc powder and slag powder could improve the tensile bond strength effectively, but the large amount of metakaolin could decrease the tensile strength. The optimizing experiment results showed that the optimal mix ratio of talc powder and slag powder was 30% and 20% respectively.

钢结构楼板泵送轻骨料混凝土优化配比研究

焦立颖

２０16年第10期

摘要

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摘要：对中高层钢结构建筑楼顶板所需要的泵送轻骨料混凝土进行了优化配比研究，对已有轻骨料混凝土配比在运用过程中的特点及不足进行了分析。从优选原材料入手，对本工程混凝土配合比进行了设计及优化，得到了低密度泵送轻骨料混凝土。试验结果表明，此配比下的轻骨料混凝土力学性能、体积稳定性等均满足规范和工程要求。研究成果为同类建筑结构、大跨径桥梁建设的泵送轻骨料混凝土及要求减轻结构自重的工程提供了参考。 Abstract: The mix ratio of pumping light weight aggregate concrete needed for middle and high rise steel structure building roof board is studied. The characteristics and deficiencies of the existing light weight aggregate concrete in the application process are analyzed, according to the optimization of raw materials, the design and optimization of concrete mix ratio of this project was carried out, finally the low density pumping light weight aggregate concrete was prepared. The results show that the mechanical properties and the volume stability of lightweight aggregate concrete under this ratio meet the requirements of the specification and the engineering need. The research results provide an important choice for the construction of similar structures and large span bridges, the pumping light aggregate concrete and the requirement of reducing the weight of the structure.

钢纤维喷射混凝土衬砌结构模型试验及数值模拟研究

王再举1，周祥瑞1，姚直书2

２０16年第10期

摘要

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摘要：为了研究喷射钢纤维混凝土的力学性能，设计并完成三组喷射混凝土衬砌加载模型试验。研究表明，喷射钢纤维混凝土具有良好的抗裂性和韧性，在裂缝出现时,仍能承受荷载；在混凝土中适当增加钢纤维的掺量，会显著提高混凝土的断裂性能。利用ANSYS有限元软件模拟喷射钢纤维混凝土衬砌试件在某组试验破坏荷载作用下的受力情况显示：当直墙部位荷载较大和拱部应力集中时，对整个衬砌结构很不利。 Abstract: In order to study the mechanical properties of the steel fiber reinforced sprayed concrete, three groups of lining loading model test were designed and accomplished. The results showed that, steel fiber reinforced sprayed concrete has good crack resistance and toughness, it can still resist the load when it has cracks and an appropriate steel fiber content can increase the concrete fracture properties. The sprayed steel fiber reinforced concrete lining specimens under a certain set of test loads was simulated by the ANSYS. The results showed that, the large load straight wall portion and arch stress concentration have a great harm to the entire lining structure.

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