第十期_2019_《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

铁尾矿砂掺量对混凝土性能的影响

姚雷，李晓芝，鲁明星

２０19年第10期

摘要

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摘要：按普通混凝土配合比设计的方法配制强度等级为C30、C40、C50的混凝土，通过对天然细砂、人工粗砂、铁尾矿砂进行级配优化后，研究了不同掺量的铁尾矿砂对不同强度等级混凝土基本性质的影响。结果表明，掺入铁尾矿砂后混凝土拌合物的和易性下降，且掺量越大，混凝土坍落度及扩展度越小；用铁尾矿砂配制的C30、C40混凝土，其强度略高于普通混凝土，且随铁尾矿砂掺量增加而略有增加，但用铁尾矿砂配制的C50混凝土，其强度略低于普通混凝土。 Abstract: C30, C40 and C50 concrete were prepared by the method of proportion design of ordinary concrete. After the gradation optimization of natural fine sand, artificial coarse sand and iron tailings, the influence of iron tailings additive amount on the basic properties of various strength grade concrete was studied. The results show that the workability of mixing concrete with iron tailing sand decreases. The greater the amount of iron tailing sand in the concrete mix, the lower the measured values of slump and expansion. The strength of C30 and C40 concrete prepared with iron tailing sand are slightly higher than that of ordinary concrete respectively, and slightly increases with the increase of iron tailing sand content. But the strength of C50 concrete prepared with iron tailing is slightly lower than that of C50 ordinary concrete.

姚雷,李晓芝,鲁明星.铁尾矿砂掺量对混凝土性能的影响[J].混凝土与水泥制品,2019(10):97-100. YAO L,LI X Z,LU M X.Effect of Iron Tailings Content on Performance of Concrete[J].China Concrete and Cement Products,2019(10):97-100.

原状稻壳灰及磨细灰对水泥胶砂强度和微观结构的影响

杨一凡，何智海

２０19年第10期

摘要

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摘要：针对当前原状稻壳灰储量大，难以资源化利用的困境，研究了原状稻壳灰及其粉磨对水泥胶砂强度的影响，结合扫描电镜和氮吸附法分析其影响机理，同时比较其与粉煤灰对胶砂性能的影响。结果表明，原状稻壳灰显著降低了水泥胶砂强度，且随着其掺量的增加，其降低幅度越来越大；原状稻壳灰粉磨极大地增加了胶砂强度，与基准胶砂强度相近，大于粉煤灰胶砂；原状稻壳灰劣化了胶砂内部结构，且随着其掺量地增加，其内部结构越来越疏松多孔；原状稻壳灰粉磨有利于改善细化其内部孔结构。 Abstract: At present, there are large reserves of rice husk ash without processing which is difficult to be utilized as resource, so the effect of rice husk ash without processing and its grind product on the strength of cement mortar was studied, and the mechanism was analyzed and revealed by the scanning electron microscopy and nitrogen adsorption method, which was also compared with the effect of fly ash. The results indicate that rice husk ash without processing obviously reduces the strengths of cement mortar, and with the increase of its content, the reduction is larger and larger. However, the grind product of rice husk ash without processing greatly increases the strengths of cement mortar, close to those of the control mortar and more than those of cement mortar containing fly ash. Rice husk ash without processing degrades the internal structure of cement mortar, which is looser and looser with the increase of its content. The grind product of rice husk ash without processing is beneficial to refining and improving the internal pore structure.

杨一凡,何智海.原状稻壳灰及磨细灰对水泥胶砂强度和微观结构的影响[J].混凝土与水泥制品,2019(10):92-96. YANG Y F,HE Z H.Effect of undisturbed rice husk ash and ground ash on strength and microstructure of cement mortar[J].China Concrete and Cement Products,2019(10):92-96.

垃圾焚烧底渣粉磨工艺及再生微粉强度特征

董云1，刘畅1,2，张国瀛1,2，李伟华3，王琅3，邹易君1,2

２０19年第10期

摘要

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摘要：为提高城市生活垃圾焚烧底渣的再生利用价值，以0.18 mm通过率和比表面积作为控制指标进行了不同转速、球磨时间的垃圾焚烧底渣球磨对比试验，并采用不同比表面积的底渣再生微粉内掺替代水泥进行胶砂强度试验。结果表明，垃圾焚烧底渣材质较轻且易于研磨，再生微粉的细度容易达到并远大于水泥的细度；在一定范围内提高转速，可提高再生微粉0.18 mm通过率和比表面积，有效缩短研磨时间；垃圾焚烧底渣再生微粉具有与水泥类似的化学成分及凝胶活性，最大强度活性指数约为57%；细度对再生微粉的胶砂强度影响较为显著，随微粉细度增加，再生微粉胶砂强度总体上呈现先增加后减小的变化趋势；再生微粉对胶砂早期强度影响较小，但会导致胶砂强度增长速度明显变缓。 Abstract: In order to improve the recycling value of waste incinerator residues, the comparison test of waste incineration bottom slag ball mill with different rotational speed and ball milling time was carried out by using the control index of 0.18 mm passing rate and specific surface area, and the cement strength test was carried out with different specific surface area of regenerated powder of bottom slag instead of cement. The results show that the waste incinerator residue is lighter and easier to grind, the fineness of regenerated powder is easy to reach and much larger than that of cement. Increasing the grinding speed in a certain range can improve the 0.18 mm passing rate and specific surface area of the regenerated powder, and effectively shorten the grinding time. The regenerated powder of waste incinerator residues has similar chemical composition and gel activity to cement, and the maximum strength activity index is about 57%. The fineness has a significant effect on the mortar strength of regenerated powder which generally shows a trend of first increasing and then decreasing with the increase of fineness. The regenerated powder has little effect on the early mortar strength, but will slow down the growth rate of mortar strength obviously.

董云,刘畅,张国瀛,等.垃圾焚烧底渣粉磨工艺及再生微粉强度特征[J].混凝土与水泥制品,2019(10):87-91. DONG Y,LIU C,ZHANG G Y,et al.Grinding Technology of the Waste Incineration Residue and Strength Characteristics of Regenerated Power[J].China Concrete and Cement Products,2019(10):87-91.

绿色环保混凝土搅拌站的四废处理

满丽莹1，王裕银1,2，李酉成1，谢一飞1，张蕊1，田寅1

２０19年第10期

摘要

引用本文

摘要：根据混凝土搅拌站绿色设计的要求，分析了混凝土搅拌站绿色环保化进程中的设计理念和实现途径，阐述了混凝土生产过程中废水的回收、利用方式，固体废弃物的处理与应用途径，抑尘和降噪的措施，为混凝土搅拌站的绿色环保设计和生产提供参考。 Abstract: According to the requirement of environment-friendly design of concrete mixing station, the design concept and implement way for the process of concrete batching plant are introduced, and the treatment and reuse of the waste water and solid waste and the way to limit dust and nose produced during production of concrete are disscued, which can provide references for the environment-friendly design and production of the concrete batching plant.

满丽莹,王裕银,李酉成,等.绿色环保混凝土搅拌站的四废处理[J].混凝土与水泥制品,2019(10):84-86. MAN L Y,WANG Y Y,LI Y C,et al.Treatment of Four Kinds of Wastes from Green Concrete Batching Plant[J].China Concrete and Cement Products,2019(10):84-86.

装配式住宅工程产业化施工措施分析

苏永波1，王肖方2，单贺明1

２０19年第10期

摘要

引用本文

摘要：以北京市某安置房项目为例，分析了装配式住宅工程产业化施工原理、准备事项，介绍了其施工中的关键技术，例如模架支设、预制板的安装、叠合板夹缝处理、钢筋绑扎、机电管线埋设及混凝土的浇筑、预制楼梯安装。可为类似住宅工程产业化施工提供经验和参考。 Abstract: A resettlement house project in Beijing was used as an example, and the industrialization construction principles and preparations of the prefabricated residential engineering were analyzed, and the key technologies in the construction such as mold frame support, prefabricated plate installation, laminated plate quilting treatment, steel bar lashing, electromechanical pipeline burying and concrete pouring, and prefabricated stair installationare were introduced, which can provide experience and reference for similar residential engineering industrialization construction.

苏永波,王肖方,单贺明.装配式住宅工程产业化施工措施分析[J].混凝土与水泥制品,2019(10):80-83. SU Y B,WANG X F,SHAN H M.Analysis of Construction Measures for Industrialization of Assembled Residential Engineering[J].China Concrete and Cement Products,2019(10):80-83.

预制混凝土衬砌管片模具的研究与改进

刘锦涛

２０19年第10期

摘要

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为提高混凝土管片模具精度和产品生产效果，针对混凝土管片模具的侧模开合方式、封闭结构、预埋件固定方式进行了研究，并设计了优化方案，供装备企业参考借鉴。 Abstract： In order to improve the precision of the concrete segment mould and the production effect of the product, the side die opening and closing mode, closed structure and embedded parts fixing mode of the concrete segment die were studied, and the optimization scheme was designed for the reference of equipment enterprises.

刘锦涛.预制混凝土衬砌管片模具的研究与改进[J].混凝土与水泥制品,2019(10):77-79. LIU J T.Research and Improvement of Precast Concrete Lining Segment Mould[J].China Concrete and Cement Products,2019(10):77-79.

不同轴压比火后框架节点加固抗震性能数值分析

王锦燕，岳幸超

２０19年第10期

摘要

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摘要：数值模拟了钢板加固火后混凝土框架节点的抗震性能，分析了轴压比对加固节点包括滞回曲线、承载能力、耗能、应力分布的影响。结果表明：相比于火后未加固节点，钢板加固后的节点在不同轴压比下弹性阶段承载力几乎不变，但极限承载力、耗能能力、延性均有不同程度的变化；当轴压比为0.5时，极限承载力、耗能能力相比未加固分别提高了8.2%、3.2%，表现出理想的抗震效果；随着轴压比的增大，节点应力分布从低轴压比下的梁端处的高应力区转变为高轴压比下的柱子的高应力分布，结构的破坏形式发生改变。 Abstract: The seismic behavior of concrete frame joint strengthened by steel plates after fire was simulated numerically. Hysteretic curve, bearing capacity, energy dissipation and stress distribution were analyzed under different axial compression ratio. The results show that the bearing capacity in elastic phase almost unchanged at different axial compression ratios, but ultimate bearing capacity, energy dissipation capacity and ductility of the strengthened joints change differently. The ultimate bearing capacity and energy dissipation capacity of strengthened concrete frame joint are increased by 8.2% and 3.2% respectively when the axial compression ratio is 0.5, showing an ideal seismic effect. With the increase of axial compression ratio, the stress distribution of the strengthened joints changes from the high stress region at the end of beam under low axial compression ratio to the high stress distribution of column under high axial compression ratio. The failure mode of structure is changed.

王锦燕,岳幸超.不同轴压比火后框架节点加固抗震性能数值分析[J].混凝土与水泥制品,2019(10):74-76. WANG J Y,YUE X C.Numerical Analysis on the Seismic Performance of Reinforced Post-fire Steel Concrete Frame Joints under Different Axial Compression Ratio[J].China Concrete and Cement Products,2019(10):74-76.

不同疲劳荷载和环氧涂层厚度下钢筋混凝土构件力学性能研究

桂世杰，陈瑜，王小惠

２０19年第10期

摘要

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摘要：为讨论不同疲劳荷载范围和钢筋涂层厚度对服役带环氧涂层钢筋混凝土构件力学性能的影响，设计了两组共10根不同涂层厚度的钢筋混凝土试件，分别对其进行50万次、不同疲劳荷载上、下限的加载，并对试件的跨中挠度、钢筋的应变分布进行了分析。分析结果表明：承受较大上、下限疲劳荷载的无涂层和环氧涂层钢筋混凝土试件，相比承受较小上、下限疲劳荷载的同类试件，无涂层钢筋混凝土试件跨中挠度因疲劳荷载上、下限引起的差距随疲劳加载次数的增加而缩小；而涂层钢筋混凝土试件的跨中挠度因疲劳荷载上、下限引起的差距则随加载次数的增加有增大趋势；较大的疲劳荷载产生较大的钢筋应变；较厚涂层钢筋混凝土试件间的钢筋应变均值的差异明显。 Abstract: In order to study the influence of different fatigue load range and load upper limit as well as coating thicknesses of the reinforcing bars on the service performance of reinforced concrete (RC) elements, 10 RC test specimens with uncoated and epoxy-coated reinforcements in two groups were experimentally loaded under different fatigue loads, where two peak fatigue loads and 500 000 loading cycles were considered. Mid-span deflection of the test specimens and steel strain distribution of the reinforcements were mainly studied. It is concluded that, for uncoated test specimens, E0.2 test specimens (i.e., 200-μm epoxy coating) and E0.6 test specimens (i.e., 600-μm epoxy coating) in two groups, when they were subjected to fatigue load with larger load range and load upper limit, larger steel strain and mid-span deflection of the test specimens were observed. With the increments of fatigue cycles, the mid-span deflection and average steel strain difference between the uncoated test specimens in two groups decreased while those differences between the same types of the coated test specimens slightly increased, especially for the coated test specimens with thicker epoxy coating thickness.

桂世杰,陈瑜,王小惠.不同疲劳荷载和环氧涂层厚度下钢筋混凝土构件力学性能研究[J].混凝土与水泥制品,2019(10):68-73. GUI S J,CHEN Y,WANG X H.Performance of RC Test Specimens with Uncoated and Epoxy-coated Reinforcements under Different Fatigue Loads[J].China Concrete and Cement Products,2019(10):68-73.

基于电阻率法的硫铝酸盐水泥泡沫混凝土凝结时间研究

任申瑞1，张楠楠1，杨毅2，黄芳2，鲁刘磊1，汪峻峰1

２０19年第10期

摘要

引用本文

摘要：基于电阻率法测定了硫铝酸盐水泥净浆与泡沫混凝土的电阻率-时间特征曲线，探究了曲线中特征点与初凝时间的关系，提出了泡沫混凝土初凝时间的测定方法。试验结果表明：净浆的电阻率特征曲线能间接反映其水化进程，净浆电阻率特征曲线可划分为潜伏期、凝结期、硬化期，其潜伏期与凝结期的拐点与其初凝时间点存在线性相关；泡沫混凝土电阻率特征曲线可划分为稳泡期、潜伏期、凝结期、硬化期，其初凝时间点为电阻率特征曲线中潜伏期与凝结期的拐点。电阻率法可用于测定泡沫混凝土的初凝时间，终凝时间的测定还有待进一步研究。　Abstract: Based resistivity method, the resistivity-time characteristic curve of sulpho-aluminate cement paste and foam concrete was determined. The relationship between resistivity characteristic point and the initial setting time was investigated. The test results show that the resistivity characteristic curve of the paste can indirectly reflect the hydration process. The resistivity curve of slurry can be divided into latent period, condensation period and hardening period. There is a correlation between the initial setting time point and characteristic point between latent period and condensation period; the resistivity characteristic curve of foam concrete is divided into the foam stabilization period, the latent period, the condensation period and the hardening period, and its initial setting time point is the characteristic point between latent period and condensation period. The resistivity method can be used to determine the initial setting time of foam concrete, and the determination of the final setting time needs further investigation.

任申瑞,张楠楠,杨毅,等.基于电阻率法的硫铝酸盐水泥泡沫混凝土凝结时间研究[J].混凝土与水泥制品,2019(10):63-67. REN S R,ZHANG N N,YANG Y,et al.Study on Setting Time of Sulphoaluminate Cement Foam Concrete Based on Resistivity Method[J].China Concrete and Cement Products,2019(10):63-67.

盐溶液环境下砂浆裂缝的自愈合行为

石宝存，张士萍，顾云凡，陈玮，魏凯

２０19年第10期

摘要

引用本文

摘要：通过超声波波速恢复率、毛细吸水量、裂缝宽度分析了不同浓度的NaCl 和Na2SO4盐溶液对砂浆裂缝自修复效果的影响，研究了高分子修复剂对裂缝修复效果的促进作用。结果表明，盐溶液的浓度对裂缝愈合性能具有一定的影响，在NaCl 和Na2SO4溶液中随着浓度（4%、6%）的升高，裂缝的愈合程度也随之提高；当掺入1%裂缝修复剂后，浓度为6%NaCl盐溶液对砂浆裂缝修复的效果最佳，修复程度达到98.58%。 Abstract: The effects of different concentrations of NaCl and Na2SO4 salt solution on the self-repairing effect of mortar cracks were analyzed by ultrasonic wave velocity recovery rate, capillary water absorption and crack width detection, and the effect of polymer repair agent on crack was studied. The results show that the concentration of salt solution has a certain effect on the fracture healing performance, in the NaCl and Na2SO4 solutions, with the increase of the concentration (4%, 6%) of NaCl and Na2SO4, the crack healing degree also increases. When 1% crack repair agent is added, the concentration of 6% NaCl salt solution has the best effect on the repair of mortar cracks, and the crack repair degree reaches 98.58%.

石宝存,张士萍,顾云凡,等.盐溶液环境下砂浆裂缝的自愈合行为[J].混凝土与水泥制品,2019(10):58-62. SHI B C,ZHANG S P,GU Y F,et al.Self-healing Behavior of Mortar Cracks in Salt Solution Environments[J].China Concrete and Cement Products,2019(10):58-62.

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