【作者】 刮俊；

【导师】 申爱琴；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2010， 硕士

【摘要】 新疆地理位置特殊,全疆大部分区域属于典型的高寒区,自然环境极为恶劣,对公路桥梁提出了更高要求。高寒地区冬季降雪量大,为了公路交通运输的安全,通常在路面上撒除冰盐,降低积雪冰点,提高路面抗滑性。但桥梁和路缘石等道路构造物混凝土却因此而遭受盐水侵蚀和冻融破坏,这种盐冻耦合的破坏力度远大于普通冻融破坏,致使新疆诸多桥梁出现了耐久性破坏,严重威胁人民生命财产安全。本文针对新疆高寒地区桥梁混凝土工作环境,依托果子沟特大桥工程,系统开展高寒地区桥梁混凝土耐久性研究,旨在提高该区桥梁混凝土抵抗冻融、腐蚀以及碳化等耐久性,研究成果不仅用于新疆高寒地区,也可向全国其他高寒地区推广。本研究首先就新疆地区桥梁混凝土病害进行了大量实地调研,分析了各种典型病害产生的原因,为该地区桥梁混凝土进行耐久性设计分区提供了有力的数据支持；针对依托工程果子沟特大桥海拔高、冬季降雪量大、风大降温快等特点,明确了大桥不同结构部位混凝土的工作环境、腐蚀环境和耐久性等级；结合该区桥梁混凝土耐久性破坏特点与机理,优选了当地用于桥梁混凝土的原材料,设计了以正交试验为主、对比试验为辅的试验研究方案,就桥梁主塔、桥面板、桥墩以及大体积承台等关键结构部位的混凝土进行了系统的耐久性优化设计；重点对高寒地区桥梁不同结构部位的混凝土抗氯离子渗透性、抗盐冻性和抗碳化性能进行试验研究,基于大量室内试验数据分析,揭示了配合比设计参数对桥梁不同结构部位混凝土耐久性能的影响规律；通过相关性分析,建立了桥梁各部位混凝土氯离子抗渗、抗盐冻、抗碳化能力之间的相互关系。综合理论分析及试验数据,提出了新疆不同地区桥梁混凝土的耐久性设计控制指标,以及桥梁不同结构部位耐久性混凝土的材料组成建议值。通过全寿命周期费用分析,发现高寒地区耐久性混凝土具有明显的经济优势,极具推广应用价值。更多还原

【Abstract】 Because of the special geographical position, most parts of Xinjiang is a typical high-cold region and has a nasty natural environment,then we need higher requirements for roads and bridges. For transport safety consideration, they usually spreading de-icing salt on the road as a result of the large snowfall in high-cold region, reduce the freezing point of snow and improve pavement skid resistance. But the bridge and curbstone and other concrete structures are subjected to salt water corrosion and therefore freeze-thaw damage, the destruction of this salt-cold coupling strength is much larger than normal freeze-thaw damage, and causing a lot of bridges in Xinjiang durability damage occurred, that’s a serious threat to people’s lives property.This studing carried out durability of concrete bridges in high-cold regions in allusion to the bridge concrete environment and rely on Guozigou Bridge project.Aimed at improving the resistance to freeze-thaw,corrosion and carbonation.The results not only for the high-cold regions of Xinjiang,but also other cold areas.In this studying, we had a large number of field disease investigation about concrete bridge in Xinjiang and analysised of various typical causes disease, and provided a strong geographical data to support the durability design division; because of the large winter snowfall,high altitude,wind speed and fast drop temperature in the support projects,we have a clear thinking about working environment,corrosive environment and the durability rating on different structural parts of concrete bridge. Combined with the characteristics and mechanism of damage about durability of concrete bridges in this area, selection of local raw materials for the concrete bridge, designed the orthogonal contrast test and comparative test to do this studying, and had a optimal design for durabilitythe in main tower, deck, piers and large volume cap on the bridge. The studying focused on resistance to chloride ion penetration, salt-cold coupling and anti-carbonation in different parts of the concrete bridge structure in high-cold region. Based on the date analysis and laboratory tests, the studying revealed the influencd law of mix design parameters for the durability of concrete bridges in different parts structure. Established a ralatedness between chloride ion penetration, salt-cold coupling and anti-carbonation through the correlation analysis. Synthesize the theoretical analysis and experimental data, presented the durability of concrete bridge design control indicators in different location of Xinjiang, and the composition of the recommended value for durability of concrete bridges in different parts. Through the life-cycle cost analysis and found that the durability of concrete in high-cold region has obvious economic advantages, with the great application and popularization.更多还原