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发布时间:2020-01-06 00:00:00
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水泥混凝土制品

低温、大温差地区预制混凝土箱梁养护制度研究
低温、大温差地区预制混凝土箱梁养护制度研究
  • 赵文斌1,赵永鹏2,刘建勋2
2020年第8期
摘要
引用本文
摘   要:为研究低温、大温差地区预制混凝土箱梁在蒸汽养护条件下温度及强度变化规律,测试了低温、大温差地区不同养护方式(标准养护、蒸汽养护、自然养护)条件下,混凝土试验箱梁温度及各龄期(3 d、5 d、7 d、14 d、28 d、56 d)的强度,试验结果表明:低温、大温差地区自然养护条件下,预制混凝土箱梁温度在浇筑后的28 h时达到峰值,在45 h时降到入模温度,龄期7 d时温度降到最低;蒸汽养护恒温65 ℃较恒温45 ℃早期强度增长快,而后期56 d龄期时强度小于恒温45  ℃。同时,蒸汽养护恒温45 ℃升温过程比恒温65 ℃升温过程稳定、易控制;56 d混凝土抗压强度比较,由大到小依次为标准养护>蒸汽养护(45 ℃)>蒸汽养护(65 ℃)>自然养护。 Abstract: In order to study the hydration reaction regularity and strength change of precast concrete box girder at low temperature and large temperature difference area, the temperature of concrete of box girder under different curing methods (standard curing, steam curing, natural curing) at low temperature and large temperature difference areas and the strength of each age (3 d, 5 d, 7 d, 14 d, 28 d, 56 d) were tested. The results show that the temperatures of concrete box girders under natural curing in low temperature and large temperature difference area reach the peak value at 28 h after pouring, and fall to the entering mould temperature at 45 h, then maintain a slow hydration reaction at 3~5 d, and drop to the lowest at 7 d , and the hydration reactions basically ended. Strength of steam curing at 65 ℃ increases faster than that at 45 ℃ in the early stage, but it′s lower than that at 45 ℃ in the later stage of 56 d. And the heating process of steam curing at 45 ℃ is more stable and easy to control than that of 65 ℃. According to the compressive strength of concrete at the age of 56 d, the strength is of the decreasing order among is standard curing, steam curing at 45 ℃ and steam curing at 65 ℃ and natural curing.
赵文斌,赵永鹏,刘建勋.低温、大温差地区预制混凝土箱梁养护制度研究[J].混凝土与水泥制品,2020(8)38-42. ZHAO W B,ZHAO Y P,LIU J X.Study on Steam Maintenance Technology of Precast Concrete Box Girder at Low Temperature and Large Temperature Difference Area[J].China Concrete and Cement Products,2020(8):38-42.
新型预应力混凝土空心支护桩的研究与应用
新型预应力混凝土空心支护桩的研究与应用
  • 邱振贵1,何友林1,张 武2
2020年第8期
摘要
引用本文
摘   要: 介绍了一种新型的先张法预应力混凝土空心支护桩,进行了部分桩型的抗弯性能试验,验证了计算方法的可靠性。工程案例应用表明,该种桩型应用在工程支护领域,特别是河道与湖泊的水系护岸、市政排水和建筑基坑等以挡土、支护为主的围护工程上具有一定的应用前景。 Abstract:A new type of pretensioned prestressed concrete hollow supporting pile is introduced,which mainly includes the products shape and the calculation of mechanical properties. And some pile types are selected for bending test to verify the reliability of the calculation method. In addition,the case application shows that in the field of support, this kind of pile has a high promotion value and application prospect in the retaining and supporting engineering of river and lake water system revetment, municipal drainage and building foundation pit as a new type of pile.
邱振贵,何友林,张武.新型预应力混凝土空心支护桩的研究与应用[J].混凝土与水泥制品2020(8):34-37. QIU Z G,HE Y L,ZHANG W.Research and Application of A New Prestressed Concrete Hollow Supporting Pile[J].China Concrete and Cement Products,2020(8):34-37.
预制清水混凝土看台板设计研究
预制清水混凝土看台板设计研究
  • 姜 广,张东阳,吕雪源,姜 伟,王 磊,李 浩,宋 煜
2020年第8期
摘要
引用本文
摘   要:针对某大型国际主题公园预制混凝土清水看台板的三折线双台阶、踏步与看台一体化预制形式,从预制方案设计、节点设计、防水设计、构件设计、混凝土配合比设计五方面阐述了看台的具体设计过程,实现了模拟弧形看台,减少看台拼缝的效果,重点解决了内凹踏步构件连接节点和防水设计难题,并保证构件达到清水效果。 Abstract: Aiming at the triple line, double stand, step and stand integrated prefabrication form fair-faced precast concrete stand plate in a certain large-scale international theme park, the precast conceptual design, connection design, waterproof design, component design and mix proportion of concrete design are studied, which effectively fulfill the simulating toward circular stand, the reducing of stand joint and resolve the key points including water recessed step connection design and waterproof design, and achieve fair-faced concrete effect.
姜广,张东阳,吕雪源,等.预制清水混凝土看台板设计研究[J].混凝土与水泥制品,2020(8):30-33,42. JIANG G,ZHANG D Y,LYU X Y,et al.Design and Application of Fair-faced Precast Concrete Stand Plate[J].China Concrete and Cement Products,2020(8):30-33,42.
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