2024_2024_《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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2024

基于ABAQUS的地铁车站大体积混凝土温度影响因素研究

曹玉新1，寇帅2，霍曼琳2，*，王国义3，任少伟2，边崇2，刘亚轩2

2024年第12期

摘要

引用本文

摘要：依托成都地铁19号线二期工程双流机场2航站楼东站车站项目，利用ABAQUS软件建立了顶板混凝土温度场模型，研究了粉煤灰掺量（0、10%、20%、30%、40%、50%）、入模温度（10、15、20、25 ℃）、保温材料种类[土工布、聚苯乙烯板（以下简称EPS）、橡塑海绵]和保温层开始覆盖时间（0、20、30、40、50 h）对大体积混凝土温度场的影响，并优选出了较优组合控温方案。结果表明：在单因素作用下，混凝土试件的最大里表温差均低于25 ℃，满足相关规范要求，但内部降温速率均高于2.0 ℃/d；基于规范要求和实际工程项目施工条件，优选出的组合控温方案为粉煤灰掺量20%或30%、入模温度15 ℃、浇筑后30 h覆盖橡塑海绵。 Abstract: Based on the Chengdu Metro Line 19 Phase Ⅱ Shuangliu Airport Terminal 2 East Station project, the temperature field model of the roof concrete was established by using ABAQUS software, and the effects of fly ash content(0, 10%, 20%, 30%, 40%, 50%), casting temperature(10, 15, 20, 25 ℃), type of thermal insulation[geotextile fabrics, polystyrene boards (EPS), and rubber-plastic sponge] and starting time of insulation coverage(0, 20, 30, 40, 50 h) on the temperature field of mass concrete were investigated, and the better combination of temperature control program was preferred. The results show that, under the action of a single factor, the maximum value of temperature difference between the inside and outside of the concrete specimen is lower than 25 ℃, which meets the relevant specification requirements, but the internal cooling rate is higher than 2.0 ℃/d. Based on the specification requirements and the actual project construction conditions, the preferred combined temperature control program is as follows: the content of fly ash is 20% or 30%, the casting temperature is 15 ℃, and the rubber-plastic sponge is covered after pouring for 30 h.

曹玉新,寇帅,霍曼琳,等.基于ABAQUS的地铁车站大体积混凝土温度影响因素研究[J].混凝土与水泥制品,2024(12):98-104. CAO Y X,KOU S,HUO M L,et al.Study on the influencing factors of mass concrete temperature in subway station based on ABAQUS software[J].China Concrete and Cement Products,2024(12):98-104.

循环冲击荷载下水工混凝土损伤效应研究

李芳1，郑永来2

2024年第12期

摘要

引用本文

摘要：水工混凝土结构不仅要遭受船舶撞击荷载作用，而且长期处于海洋环境遭受氯盐腐蚀，导致混凝土结构内部损伤堆积。采用循环冲击荷载模拟船舶靠泊时的撞击力及撞击次数，采用超声波对混凝土损伤度进行量化，并用CT技术进行验证，建立了损伤度与氯离子扩散系数之间的定量关系。结果表明：应力水平存在一个临界值0.6，当应力水平超过0.6时，混凝土的损伤度显著增加；随着损伤度的增加，混凝土的使用寿命降低；损伤度的增加比氯离子侵蚀对混凝土使用寿命的影响更明显。 Abstract: Hydraulic concrete structures not only suffer from ship impact loads, but also suffer from long-term exposure to chloride corrosion in marine environments, resulting in internal damage accumulation of concrete structures. The impact force and number of impacts during ship berthing were simulated using cyclic impact loads. Ultrasonic waves were used to quantify the damage degree of concrete, and CT technology was used for verification. A quantitative relationship between damage degree and chloride ion diffusion coefficient was established. The results indicate that there is a critical value of 0.6 for stress level, and when the stress level exceeds 0.6, the damage degree of concrete significantly increases. As the degree of damage increases, the service life of concrete decreases. The increase in damage has more significant impact on the service life of concrete than chloride ion erosion.

李芳,郑永来.循环冲击荷载下水工混凝土损伤效应研究[J].混凝土与水泥制品,2024(12):105-109. LI F,ZHENG Y L.Research on damage effect of hydraulic concrete under cyclic impact load[J].China Concrete and Cement Products,2024(12):105-109.

大体积混凝土浇筑仓块不同边界温度及应变变化规律

李灿1，林峰2，熊俊驰1，*，周殷弘2，刘宁宇3，余建国1

2024年第12期

摘要

引用本文

摘要：为研究大体积混凝土浇筑后的温度及应变变化规律，结合某工业厂房大型设备基础混凝土温度及应变测量数据，研究了该大体积混凝土关键区域（仓块中心、边缘、边缘凹角）温度-应变的时变规律。结果表明：混凝土温度变化与边界导热速率有关，各区域因边界区别温度变化规律也存在差别；当边界为外界空气时，混凝土为自由约束，应变只与混凝土的膨胀收缩有关；当边界为相邻混凝土及地基时，混凝土为固定约束，且约束随混凝土表面与边界的连接情况而改变，混凝土膨胀时受压应力，收缩时受拉应力；边缘凹角为混凝土形状突变处，会产生大量集中应力，混凝土应变明显较其他区域更大。 Abstract: In order to study the temperature and strain changes of mass concrete after pouring, combined with the temperature and strain measurement datas of the foundation concrete of a large equipment in an industrial plant, the time-varying temperature strain law of the key areas(center, edge, edge concave angle) of the mass concrete was studied. The results indicate that the temperature change of concrete is related to the thermal conductivity rate at the boundary, and the temperature change pattern varies in different regions due to boundary differences. When the boundary is the external air, the concrete is a free constraint, and the strain is only related to the expansion and contraction of the concrete. When the boundary is adjacent concrete and foundation, the concrete is a fixed constraint, and the constraint changes with the connection between the concrete surface and the boundary. The concrete experiences compressive stress during expansion and tensile stress during contraction. The concave corner of the edge is where the shape of the concrete suddenly changes, which will generate a large amount of concentrated stress, and the concrete strain is significantly larger than other areas.

李灿,林峰,熊俊驰,等.大体积混凝土浇筑仓块不同边界温度及应变变化规律[J].混凝土与水泥制品,2024(12):110-114,119. LI C,LIN F,XIONG J C,et al.Variation laws of temperature and strain at different boundaries of mass concrete pouring blocks[J].China Concrete and Cement Products,2024(12):110-114,119.

多种工况对既有桥梁安全性的影响及相关解决方案

李煌1，李琪2，*，唐甜2

2024年第12期

摘要

引用本文

摘要：针对临近既有桥梁的后建工程在施工期间引起的河岸边地质条件变化，及其对桥梁造成的不利影响，通过分析桥梁观测点的位移量及沉降量，明确了影响既有桥梁稳定性的原因，指出了桥梁出现的主要病害，如桥墩顺桥偏移量较大、桥墩和桩基承载能力不足、桥墩开裂等，并设计了相应的维修加固方案。研究结果对评估河岸边后建工程对既有桥梁的影响及设计相应处置方案具有重要工程意义。 Abstract: In response to the geological changes along the riverbank caused by the construction of the adjacent post construction project of the existing bridge, as well as its adverse effects on the bridge, the reasons affecting the stability of the existing bridge are identified by analyzing the displacement and settlement of the bridge observation points. The main diseases of the bridge are pointed out, such as large displacement of the bridge piers along the bridge, insufficient bearing capacity of the bridge piers and pile foundations, and cracking of the bridge piers, and corresponding maintenance and reinforcement plans are designed. The research results have important engineering significance for evaluating the impact of subsequent riverbank projects on existing bridges and designing appropriate treatment plans.

李煌,李琪,唐甜.多种工况对既有桥梁安全性的影响及相关解决方案[J].混凝土与水泥制品,2024(12):115-119. LI H,LI Q,TANG T.Impact of multiple working conditions on safety of existing bridges and related solutions[J].China Concrete and Cement Products,2024(12):115-119.

贵州花江峡谷大桥重力锚基础大体积混凝土温控技术研究

周毅1，2，3，陈露一1，2，3，蔡昱1，2，3，黄有强1，2，3，李天1，2

2024年第12期

摘要

引用本文

摘要：依托贵州花江峡谷大桥重力锚基础工程，采用优化配合比、布置冷却水管、调整混凝土养护制度等措施控制大体积混凝土的温度，采用Midas Civil软件预测了大体积混凝土的温度和应力发展趋势，并通过现场温度监测验证了温控措施的可行性。结果表明：重力锚基础大体积混凝土的温度峰值和里表温差均满足相关标准要求，且现场温度监测结果与仿真计算结果接近；重力锚基础大体积混凝土现场施工时未出现温度裂缝，采取的温控措施切实有效。 Abstract: Based on the gravity anchor foundation project of Guizhou Huajiang Canyon Bridge, measures such as optimizing the mixing proportion, arranging cooling water pipes, and adjusting the concrete curing regimes were adopted to control the temperature of mass concrete, the Midas Civil software was adopted to predict the development trend of the temperature and stress of the mass concrete. And the feasibility of temperature control measures was verified through on-site temperature monitoring. The results show that, the peak temperature and temperature difference between inner and surface of the mass concrete for gravity anchor foundations meet the requirements of the relevant standards. And the on-site temperature monitoring results are close to the results of the simulation analysis. During the construction process, there is no temperature crack in the mass concrete for gravity anchor foundations, and the temperature control measures taken are effective.

周毅,陈露一,蔡昱,等.贵州花江峡谷大桥重力锚基础大体积混凝土温控技术研究[J].混凝土与水泥制品,2024(12):78-82. ZHOU Y,CHEN L Y,CAI Y,et al.Research on temperature control techniques for mass concrete of gravity anchorage foundation of Huajiang Canyon Bridge in Guizhou[J].China Concrete and Cement Products,2024(12):78-82.

C45P8大体积混凝土在某地标核心筒筏板基础中的应用

侯旭林1，赵爽1，曾鲁平1，王伟1，陈俊松1，赵峰2

2024年第12期

摘要

引用本文

摘要：依托某地标核心筒筏板基础大体积混凝土工程，在满足C45P8设计要求的前提下，通过原材料优选、配合比优化（降低胶凝材料用量、复掺矿物掺合料、优选外加剂种类）和施工技术调控（浇筑顺序、分层厚度、振捣工艺、养护制度等）来降低大体积混凝土的水化温升，降低开裂风险。结果表明：优选原材料、合理设计配合比，并辅以合适的施工技术措施，可使大体积混凝土的内、外温差小于25 ℃，满足大体积混凝土施工温控技术要求。 Abstract: Based on a landmark core raft foundation mass concrete project, while meeting the design requirements of C45P8, measures were taken to reduce the hydration temperature rise and the cracking risk of mass concrete through raw material selection, mix proportion optimization(reducing the amount of cementitious materials, adding mineral admixtures, optimizing the types of admixtures), and construction technology regulation(pouring sequence, layer thickness, vibration process, curing system, etc.). The results show that by optimizing raw materials, designing reasonable mix proportions, and supplementing with appropriate construction technology measures, the temperature difference between the inside and outside of mass concrete can be reduced to less than 25 ℃, which meets the temperature control technology requirements for mass concrete construction.

侯旭林,赵爽,曾鲁平,等.C45P8大体积混凝土在某地标核心筒筏板基础中的应用[J].混凝土与水泥制品,2024(12):83-86,92. HOU X L,ZHAO S,ZENG L P,et al.Application of C45P8 mass concrete in a landmark core raft foundation[J].China Concrete and Cement Products,2024(12):83-86,92.

水下混凝土结构填缝止水胶抗渗性能试验方法研究

张景奎1，刘长顺1，罗居刚1，孔楠楠1，姚亮1，彭建和1，许军才2

2024年第12期

摘要

引用本文

铁铝酸盐水泥混凝土异形构件施工技术研究

邹德麟1，齐冬有2，邱开建3，向世文1，李长成2，张华英3，张巍1，李春林4，张栩嘉3

2024年第12期

摘要

引用本文

摘要：制备了铁铝酸盐水泥混凝土异形构件，研究了浇筑层数（2、3、4层）、振捣时间（10、20、30、40 s）和脱模时间（15、20、25 h）对构件外观质量和力学性能的影响。结果表明：随着浇筑层数的增加，构件的7 d回弹强度增大，且当浇筑层数为3层时，构件的外观质量最好；随着振捣时间的增加，构件的7 d回弹强度先增大后减小，且当振捣时间为20~30 s时，构件的外观质量较好；随着脱模时间的延长，构件的回弹强度增大，且当脱模时间为20~25 h时，构件的外观质量较好；综合考虑构件的外观质量、力学性能和模具周转频率，建议采用分3层浇筑、振捣时间为20~30 s和脱模时间20 h的施工技术。 Abstract: Ferro aluminate cement concrete irregular components were prepared, and the effects of pouring layer(2, 3, 4 layers), vibration time(10, 20, 30, 40 s), and demoulding time(15, 20, 25 h) on the appearance quality and mechanical properties of the components were studied. The results indicate that as the number of pouring layers increases, the 7 d rebound strength of the component increases, and when the number of pouring layer is 3, the appearance quality of the component is the best. As the vibration time increases, the 7 d rebound strength of the component first increases and then decreases, and when the vibration time is 20~30 s, the appearance quality of the component is good. With the extension of demoulding time, the rebound strength of the component increases, and when the demolding time is 20~25 h, the appearance quality of the component is good. Taking into account the appearance quality, mechanical properties, and mold turnover frequency of the components, it is recommended to adopt a construction technique of pouring layer of 3, vibration time of 20~30 s, and demoulding time of 20 h.

邹德麟,齐冬有,邱开建,等.铁铝酸盐水泥混凝土异形构件施工技术研究[J].混凝土与水泥制品,2024(12):93-97. ZOU D L,QI D Y,QIU K J,et al.Study on construction technology of ferro aluminate cement concrete irregular components[J].China Concrete and Cement Products,2024(12):93-97.

二元微生物混凝土裂缝自修复材料的制备及性能研究

郑新国1，2，刘竞1，2，郁培云1，2，李书明1，2，*，张磊3，李嘉璇3

2024年第12期

摘要

引用本文

摘要：制备了基于巴氏芽孢杆菌和胶质芽孢杆菌的二元微生物混凝土裂缝自修复材料，研究了巴氏芽孢杆菌和胶质芽孢杆菌体积比（混合比例10∶0、8∶2、6∶4、4∶6、2∶8、0∶10）对微生物的生长规律、矿化效果等的影响，并对自修复材料的裂缝修复效果进行了测试。结果表明：当混合比例为6∶4时，细菌浓度最高，CaCO3沉淀量最大，产生的方解石结晶度最好，砂浆试件的裂缝修复率最高。 Abstract: A dual microbial concrete crack self-healing material based on Bacillus subtilis and Bacillus mucilaginosus was prepared. The effects of the volume ratios of Bacillus subtilis and Bacillus mucilaginosus(mixing ratios of 10∶0, 8∶2, 6∶4, 4∶6, 2∶8, 0∶10) on microbial growth patterns, mineralization effects, etc. were studied, and the crack repair effect of the self-healing material was tested. The results show that when the mixing ratio is 6∶4, the bacterial concentration is the highest, the CaCO3 precipitation is the largest, the resulting calcite crystallinity is the best, and the crack repair rate of the mortar specimen is the highest.

郑新国,刘竞,郁培云,等.二元微生物混凝土裂缝自修复材料的制备及性能研究[J].混凝土与水泥制品,2024(12):57-63. ZHENG X G,LIU J,YU P Y,et al.Preparation and performance study of dual microbial concrete crack self-healing material[J].China Concrete and Cement Products,2024(12):57-63.

混凝土裂缝修复技术的研究现状及进展

李文静，贾苍琴*，王贵和，向雅然

2024年第12期

摘要

引用本文

摘要：介绍了传统混凝土裂缝修复技术和新兴微生物诱导碳酸钙沉淀（MICP）技术的研究进展，从修复材料和工艺上进行了总结与评价，并从裂缝宽度、抗压强度、抗渗性能方面分析了MICP技术修复混凝土裂缝的效果，总结了MICP技术存在的问题，最后展望了其发展趋势，指出了该技术进一步的研究方向。 Abstract: The research progress of traditional concrete crack repair technology and emerging microbial induced calcium carbonate precipitation (MICP) technology is introduced. The repair materials and processes are summarized and evaluated, and the effect of MICP technology on repairing concrete cracks is analyzed from the aspects of crack width, compressive strength, and impermeability. The problems of MICP technology are summarized, and its development trend is predicted. The further research directions of MICP technology are also pointed out.

李文静,贾苍琴,王贵和,等.混凝土裂缝修复技术的研究现状及进展[J].混凝土与水泥制品,2024(12):64-69. LI W J,JIA C Q,WANG G H,et al.Research status and development of concrete crack repair technology[J].China Concrete and Cement Products,2024(12):64-69.

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