甘肃省戈壁地区养护方式对预制混凝土箱梁抗裂性及强度的影响

发布时间：2018-06-27 22:07

本文选题：戈壁环境 + 箱梁裂缝　；参考：《硅酸盐通报》2017年11期

【摘要】：为研究甘肃省戈壁地区养护方式对预制混凝土箱梁抗裂性及强度的影响,首先勘测了现场气候条件,选择了三种养护方案。然后测试和分析了不同养护方式下试验箱梁强度及裂缝的发展规律,结果表明:按照蒸汽养护、土工布包裹养护、薄膜包裹养护的顺序混凝土强度及拉压比逐渐减小,抗裂性逐渐减弱;蒸汽养护为戈壁地区最佳的养护方式;戈壁地区出现的裂缝宽度主要分布在0.00~0.02 mm及0.03~0.04 mm两个区间;在戈壁地区混凝土箱梁的养护不仅要注重保湿养护,更应该加强保温养护。最后结合试验和现场施工情况,对大温差、干寒、强风地区预制混凝土箱梁裂缝的预防和控制提出一些针对性的建议。
[Abstract]:In order to study the effect of maintenance mode on crack resistance and strength of precast concrete box girder in Gobi area of Gansu Province, the field climatic conditions were investigated and three maintenance schemes were selected. Then the strength and crack development of the test box girder under different curing modes are tested and analyzed. The results show that: according to steam curing, geotextile wrapping maintenance, the sequence of concrete strength and pull-compression ratio of film wrapped curing decreases gradually. The crack resistance is gradually weakened, steam curing is the best curing mode in Gobi area, the crack width in Gobi area is mainly distributed in two sections: 0.000. 02 mm and 0. 03 ~ 0. 04 mm. In Gobi area, the maintenance of concrete box girder should pay attention not only to moisture preservation, but also to the maintenance of concrete box girder in Gobi area. More should strengthen heat preservation. Finally, combined with the test and field construction, some suggestions are put forward for the prevention and control of cracks in precast concrete box girder in the areas of large temperature difference, dry cold and strong wind.
【作者单位】：甘肃省交通运输厅;兰州交通大学甘肃省道路桥梁与地下工程重点实验室;兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室;
【基金】：甘肃省交通运输厅科研项目(201606) 长江学者和创新团队发展计划滚动支持(IRT1R29)
【分类号】：U441;U445.57

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