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.

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.

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.