【作者】 李京利；

【导师】 张登良；

【作者基本信息】 长安大学 ， 材料学， 2007， 硕士

【摘要】 混凝土桥面铺装在交通荷载、自然因素、温度与收缩应力等综合作用下,普遍出现了早期开裂与破坏。这些裂缝加速了钢筋腐蚀和混凝土的破坏,尤其在寒冷地区,由于桥面渗漏水,造成桥面混凝土冻胀碎裂;小箱梁由于箱内积水发生冻胀开裂,严重影响桥面铺装的使用耐久性,导致其寿命缩短,维修费用增加。本文在分析总结国内外研究成果的基础上,开发了几种具有高抗渗、高耐久低开裂,适用于寒冷地区的桥面铺装材料,并通过大量试验与理论分析,系统研究了桥面铺装混凝土的施工与配合比设计的关键技术以及高效引气减水剂、抗渗剂、聚丙烯纤维网和钢纤维对混凝土的改性作用,得出了各种混凝土的强度、压折比、耐磨性、抗渗性、抗冻融性以及弯曲疲劳韧性的特点及变化规律。对防水混凝土、聚丙烯纤维网混凝土、钢纤维混凝土的设计与施工的技术问题进行了探讨,提出了桥面铺装的施工工艺。讨论了防水混凝土、聚丙烯纤维网混凝土与钢纤维混凝土在寒冷地区桥面铺装中应用的可行性。根据不同类型桥梁结构型式,提出了合理的铺装混凝土类型与铺装厚度,并进行了汽车荷载应力分析,探讨了不同桥梁的铺装层结构的受力规律,为设计理论与方法研究提供了理论依据。更多还原

【Abstract】 Early crack and deterioration of many bridge deck pavements have been attributed the traffic load,nature factor and high thermal or shrinkage stress development in the concrete.these cracks accelerate deterioration of concrete and corrosion of reinforcing steel.Especially in the cold area,the concrete of bridge deck pavement swells disintegrate owing to the freezing of water.The box beams crack because of the swelling of water in the box under freezing.The wear of the bridge deck pavement has been influenced badly that service lives have been shorten and the maintenance costs of bridge deck pavement increase.On the basis of summing up the study achievements both home and abroad,this study is conducted to develop several new bridge deck materials that has low cracking potential ,lowpermeability,good durability,and adequate strength and is the same with cold area.The key technical problems of construction and the design of concrete mix on bridge deck pavement,the modified effect of high effect gas forming agent and water reducer,seepage resister, reticulate polypropylene fiber and steel fiber to concrete are studied systematically by many tests and theoretical analysis.The law of flexural strength,the ratio of compressive strength to flexural strength,permeability,abrasion resistance,freezing resist and bending fatigue property is obtained.The technical problems of design and construction on waterproof concrete,polypropylenefiber concrete and steel fiber concrete are probed into ,and the technology construction of bridge deck pavement is presented.The feasibility on application of waterproof concrete,polypropylene fiber concrete and steel fiber concrete to bridge deck pavement in cold area is discussed.According to different styles of the bridges,the reasonable styles of concrete and thickness of bridge deck pavement are presented.The stress is analyzed and the law of stress distribution is discussed when the bridge deck pavement is under traffic load,providing academic gist for designing and studying.更多还原