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2020

固体废弃物的资源化利用 ——评《固体废弃物在绿色建材中的应用》

倪红

2020年第12期

摘要

引用本文

倪红.固体废弃物的资源化利用——评《固体废弃物在绿色建材中的应用》[J].混凝土与水泥制品,2020(12):96-97.

铁尾矿砂对机制砂混凝土性能的影响研究

刘文燕1，张友来1，李绍纯2，邢卫疆1，孟玉冰1

2020年第12期

摘要

引用本文

摘要：研究了铁尾矿砂取代率对机制砂混凝土工作性、力学性能和耐久性能的影响。结果表明：当铁尾矿砂取代率为40%时，混合砂的颗粒级配及细度模数与河砂相近，此时，混合砂混凝土的工作性和力学性能最优；随着铁尾矿砂取代率在一定范围内增加，混凝土的抗渗性能和抗氯离子侵蚀性能逐步提升。 Abstract: The effect of iron tailings sand replacement rate on the workability, mechanical properties and durability of machined sand concrete was studied. The results show that when the iron tailings sand replacement rate is 40%, the particle size gradation and fineness modulus of the mixed sand are similar to those of river sand. The concrete prepared by the mixed sand shows good workability and mechanical properties. In addition, as the iron tailings sand replacement rate increases within a certain range, the impermeability and the resistance to chloride ion erosion of concrete are gradually improved.

刘文燕,张友来,李绍纯,等.铁尾矿砂对机制砂混凝土性能的影响研究[J].混凝土与水泥制品,2020(12):84-86. LIU W Y,ZHANG Y L,LI S C,et al.Research on the Influence of Iron Tailings Sand on the Performance of Machined Sand Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):84-86.

再生混凝土骨料强化方法研究进展

梁超锋1,2，杜孝敏1，裘锦瑜1，高越青1，WORKNEHHAILEAB Meles1

2020年第12期

摘要

引用本文

摘要：再生混凝土骨料（RCA）表层砂浆的多孔性和高吸水性对再生骨料混凝土的力学性能和耐久性能不利，去除和强化RCA表层砂浆是提高RCA性能的两种主要方法。基于此，总结了聚合物、硅酸钠、微粉、CO2碳化、微生物碳酸盐沉积等RCA表层附着砂浆强化方法的研究现状，分析了各RCA强化方法的优缺点，并提出了有待进一步研究的问题，以推进再生混凝土的应用。 Abstract: The porosity and high water absorption of recycled concrete aggregate (RCA) surface mortar are detrimental to the mechanical properties and durability of recycled aggregate concrete. Removal and modification of RCA surface mortar are the two main ways to improve RCA performance. Based on this, the progress on various modification approaches of RCA surface mortar such as polymer coating, sodium silicate modification, micro-powder filling, CO2 carbonation and microbial carbonate deposition is summarized, the advantages and disadvantages of each RCA modification method are analyzed, and the problems to be further studied are put forward to promote the application of recycled concrete.

梁超锋,杜孝敏,裘锦瑜,等.再生混凝土骨料强化方法研究进展[J].混凝土与水泥制品,2020(12):87-91. LIANG C F,DU X M,QIU J Y,et al.Research Progress on Modification Methods of Recycled Concrete Aggregate[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):87-91.

生活垃圾焚烧炉渣在透水混凝土中的应用

张立力1，谢一飞1，刘增喜2，宋奕波3，骆静静1，田寅1，满丽莹1，蒋涛1

2020年第12期

摘要

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摘要：分析了生活垃圾焚烧炉渣的各项性能指标，并将其经多道水洗、筛分等工艺制成再生骨料，利用再生骨料取代天然砂石制备了透水混凝土。结果表明：生活垃圾焚烧炉渣的粒径分布较优，基本满足Ⅱ类建设用砂标准要求；再生骨料透水混凝土的抗压强度均低于基准组，透水系数均大于10 mm/s；随着再生骨料（处理后）取代率的增加，试件的28 d抗压强度逐渐降低；在取代率为100%的情况下，与未处理再生骨料透水混凝土相比，处理后再生骨料透水混凝土的抗压强度提高了43.1%。 Abstract: The various indicators of the domestic waste incinerator slag were analyzed, and it was prepared into recycled aggregate through multiple washing, screening and other processes, and the pervious concrete was prepared by using recycled aggregate instead of natural sand. The results show that the domestic waste incinerator slag basically meets the requirements of Type Ⅱ construction sand standard, and the particle size distribution is better. The compressive strength of recycled aggregate pervious concrete is lower than that of reference group. The permeability coefficient of recycled aggregate pervious concrete is greater than 10 mm/s. With the increase of the replacement rate of recycled aggregate (after treatment), the 28 d compressive strength of specimen gradually decreases. When the replacement rate is 100%, compared with the untreated recycled aggregate pervious concrete, the compressive strength of the treated recycled aggregate pervious concrete is increased by 43.1%.

张立力,谢一飞,刘增喜,等.生活垃圾焚烧炉渣在透水混凝土中的应用[J].混凝土与水泥制品,2020(12):92-95. ZHANG L L,XIE Y F,LIU Z X,et al.Experimental Research on Application of Domestic Waste Incinerator Slag in Pervious Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):92-95.

超高性能混凝土渗透性的三种电测方法比较

王增浩，魏宇桐，路新瀛

2020年第12期

摘要

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摘要：利用ASTM C1202法、NT Build 492/RCM法及NEL法对三种市售超高性能混凝土（UHPC）基体预混料的渗透性进行了检测，以分析其适用性。结果表明：ASTM C1202电量法的测试结果均在100 C以下，难以进行更加细致的区分；NT Build 492/RCM电迁移法即使在60 V下通电500 h，试件中的氯离子显色深度也多在2 mm以内，由显色深度读数引起的测试误差较大；NEL饱盐电导率法的测试结果与现有研究结果基本吻合，考虑测试结果的区分度，该法仍是UHPC渗透性检测的首选之法，但其可靠性仍需更多的实践检验；对于无需测试氯离子扩散系数的场合，可直接采用规定测试条件下的试件电导率（或电阻率）来比较材料的渗透性高低。 Abstract: The ASTM C1202, NT Build 492/RCM and NEL test methods were used to compare the permeability of three commercial ultra-high performance concrete(UHPC) matrix premixes, and the applicability of these methods was analyzed. The results show that the ASTM C1202 electric charge method is mostly below 100 C, and it is difficult to make a more detailed distinction. For the NT Build 492/RCM electric migration test method, the chloride penetration depths after 500 h at 60 V are mostly within 2 mm together with large reading errors causing unavoidable fluctuations. The results of the NEL salt saturated conductivity method are basically consistent with the data reported in the literature, and considering the principle and the resolution, the NEL method is currently the preferred method for UHPC permeability evaluation even though its reliability still needs further practical inspections. For those cases the chloride diffusivities unnecessary, the electrical conductivity or resistivity of the UHPC can be directly employed to compare its permeability under the same testing conditions.

王增浩,魏宇桐,路新瀛.超高性能混凝土渗透性的三种电测方法比较[J].混凝土与水泥制品,2020(12):79-83. WANG Z H,WEI Y T,LU X Y.Comparison of Three Electrical Testing Methods for Evaluation of Permeability of Ultra-high Performance Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,(12):79-83.

可扩展组合式长线台座法预制构件生产线的研发与应用

杨佳林1,3，朱敏涛2，周强2

2020年第12期

摘要

引用本文

摘要：为满足生产工艺要求，考虑原有生产车间特点，研发了可扩展组合式长线台座法预制构件生产线，并重点阐述了振捣和侧翻一体化设备、移动式装备摆渡设备、自行移动式边模、钢筋运输安装一体化设备等可移动式装备的构造要求，以期为预制构件生产线及装备的研发与应用提供参考和借鉴。 Abstract: In order to meet requirements of production process and considering characteristics of the original workshop, the expandable combined long line pedestal prefabricated component production line is developed. The structural requirements of movable equipment such as vibration and rollover integrated equipment, mobile equipment ferry equipment, self-propelled side formwork and integrated equipment for steel transportation and installation are elaborated to provide a reference for remodeler and application of traditional prefabricated component production line.

杨佳林,朱敏涛,周强.可扩展组合式长线台座法预制构件生产线的研发与应用[J].混凝土与水泥制品,2020(12):76-78. YANG J L,ZHU M T,ZHOU Q.Research and Application of Expandable Combined Long Line Pedestal Prefabricated Component Production Line[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):76-78.

预制混凝土内墙板立模生产工艺研究与应用

赵志刚1，杨思忠2，任成传1，王文欢1，刘蕴哲1，王志礼1，王群1，董铁良1

2020年第12期

摘要

引用本文

摘要：结合开发的自动化成组立模设备，研究并优化了快速组模、预埋件定位、模板变形和漏浆控制、浇筑振捣和自动养护等关键工艺环节，解决了预制混凝土内墙板立模生产的技术难题。通过工程应用，说明了立模生产的内墙板相比平模在质量上有明显提升。采用立模除了可节省空间外，生产效率大大提高，能耗明显降低，社会和经济效益显著。 Abstract: In combination with the developed automatic group vertical mold equipment, the key technologies such as rapid mold forming, embedded part positioning, formwork deformation and slurry leakage control, casting and vibration,automatic curing are studied and optimized, and the technical difficulties in precast concrete inner wall panel manufacturing technique by using the vertical mold are solved. Through the engineering application, it is shown that the quality of the inner wall panel produced by the vertical mold is significantly improved compared with that of the flat mold.In addition to greatly saving space, the use of the vertical mold greatly improves production efficiency, significantly reduces energy consumption, and has significant social and economic benefits.

赵志刚,杨思忠,任成传,等.预制混凝土内墙板立模生产工艺研究与应用[J].混凝土与水泥制品,2020(12):59-62. ZHAO Z G,YANG S Z,REN C C,et al.Research and Application of Precast Concrete Inner Wall Panel Manufacturing Technique by Using the Vertical Mold[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):59-62.

夹心保温外墙板用不锈钢拉结件抗剪承载力研究

郑旭1，郑勇2，刘海成3，刘欢2

2020年第12期

摘要

引用本文

摘要：基于ABAQUS有限元模拟分析软件对不同厚度与尺寸的18组板型不锈钢拉结件进行了模拟，通过数值计算分析的方法确定了其抗剪承载力，得出了板型拉结件应力发展过程。结果表明：板型不锈钢拉结件具有较大的平面内抗剪承载能力，当拉结件尺寸相同时，其抗剪承载力随厚度的增加而增大；同厚度、同高度的不锈钢拉结件的长度越大，抗剪承载力越大；同厚度、同长度的不锈钢拉结件，随着高度的增加，其抗剪承载力变化不大；设计中可以屈服强度为基准，安全系数取3.0，确定板型不锈钢拉结件的允许剪切强度。 Abstract: Based on ABAQUS finite element simulation software, 18 groups of stainless steel tie-in pieces with different thickness and size were simulated, and their shear capacity was determined by numerical calculation and analysis, and the stress development process of the plate type stainless steel tie-in parts was obtained. The results show that the plate type stainless steel tie-in parts have large in-plane shear bearing capacity. When the size of the tie-in parts is the same, the shear bearing capacity increases with the increase of the thickness. The longer the stainless steel tie-in pieces of the same thickness and height, the greater the shear bearing capacity. When the thickness and length of stainless steel pull-out pieces are the same, the shear bearing capacity has little change with the increase of height. The yield strength can be taken as the basis in the design, and the safety factor is taken as 3.0 to determine the allowable shear strength of plate type stainless steel tie-in parts.

郑旭,郑勇,刘海成,等.夹心保温外墙板用不锈钢拉结件抗剪承载力研究[J].混凝土与水泥制品,2020(12):63-67. ZHENG X,ZHENG Y,LIU H C,et al.Study on Shearing Capacity of Stainless Steel Connector with Sandwich Wall [J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):63-67.

十字型ECC框架节点在循环荷载下的抗震性能分析

丁捷，周旭，黄可

2020年第12期

摘要

引用本文

摘要：通过选取典型的足尺试验模型，从其骨架曲线、荷载及位移等方面进行了ABAQUS验证，从而得出有限元计算的可靠性。基于此，进行了高轴压比（0.5、0.7、0.9）下十字型ECC框架节点在循环荷载下的抗震性能分析。结果表明：设计轴压比为0.9时框架节点易出现严重的节点核心区剪切破坏，耗能相比于0.5轴压比下降了约11.2%，出现严重的塑性变形；0.5轴压比下位移延性系数μ达到了5.37，所有试件μ均值达到了3.0以上，破坏模型均为延性破坏。 Abstract: The typical full-scale test models were selected and verified by ABAQUS software from the aspects of skeleton curve, load and displacement, so as to obtain the reliability of the finite element method. Based on this, the seismic behavior of ECC frame joints with high axial compression ratio (0.5, 0.7, 0.9) under cyclic load was analyzed. The results show that when the design axial compression ratio is 0.9, the frame joints are prone to serious shear failure in the core area, and the energy consumption is about 11.2% lower than that of the 0.5 axial compression ratio, which leads to serious plastic deformation. When the design axial compression ratio is 0.5, μ reaches 5.37, and the average μ of all specimens reaches above 3.0, and the failure mode is ductile failure.

丁捷,周旭,黄可.十字型ECC框架节点在循环荷载下的抗震性能分析[J].混凝土与水泥制品,2020(12):68-72. DING J,ZHOU X,HUANG K.Seismic Performance Analysis of Cross ECC Frame Joints Under Cyclic Load [J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):68-72.

不同等级砂加气混凝土碳化性能研究

薛小雨1，杨萍1，李军奇1，刘洋1，何廷树2，许荣盛2，陈畅2

2020年第12期

摘要

引用本文

摘要：采用碳化深度测量、SEM、XRD等手段，在特定的环境下研究了不同等级砂加气混凝土的碳化性能和力学性能。结果表明：由于砂加气混凝土水化生成的托贝莫来石逐渐转变为方解石，砂加气混凝土的抗压强度随着碳化深度的增加而明显下降。 Abstract: The carbonation performance and mechanical properties of different grades of sand aerated concrete were studied under specific conditions by means of depth measurement, SEM and XRD. The results show that the compressive strength of sand aerated concrete decreases obviously with the increase of carbonation depth because of the tobermorite formed by hydration of sand aerated concrete gradually transforms into calcite.

薛小雨,杨萍,李军奇,等.墙体材料蓄放热性能动态测试方法[J].混凝土与水泥制品,2020(12):73-75,95. XUE X Y,YANG P,LI J Q,et al.Study on Carbonation Performance of Different Grades of Sand Aerated Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):73-75,95.

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