水泥混凝土桥面铺装材料与技术研究

【作者】 孙增智；

【导师】 申爱琴； 胡长顺；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2004， 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的腐蚀和混凝土的破坏,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,开发了几种具有高强抗渗、高耐久低开裂的桥面铺装材料,并通过大量实验与理论分析,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减水剂、聚丙烯纤维网和聚丙烯酰胺对混凝土的改性作用,得出了抗折强度、粘结强度、压折比、渗透性、抗磨性、弯曲疲劳特性、冲击韧性、弯曲韧性和收缩的变化规律。通过扫描电镜、差热分析、热重分析和红外光谱分析了混凝土桥面铺装的微观结构以及外掺材料对混凝土的物理化学作用,并探讨了外掺材料对混凝土桥面铺装层路用性能的改善效果。对防水混凝土、纤维混凝土、聚合物水泥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、聚丙烯酰胺改性水泥混凝土在桥面铺装中应用的可行性,并进行了社会与经济效益分析。更多还原

【Abstract】 Marly crack and deterioration of many bridge deck overlays have been attributed to 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 that shorten the service lives and increases the maintenance costs of bridge decks.On the basis of summing up the study achievements both home and abroad, this study was conducted to develop several new bridge deck materials that has low cracking potential, low permeability, good durability, and adequate strength. The key technical problems of construction and the design of concrete mix on bridge deck overlays, the modified effect of high effect water reducer, reticulate polypropylene fiber and polyacryamide(PAM) to concrete are studied systematically by many tests and theoretical analysis. The law of flexural strength, bond strength, the ratio of compressive strength to flexural strength, permeability, abrasion resistance, bending fatigue property, impact toughness, flexural toughness and shrinkage is obtained. Through scanning electron microscope, differential thermal analyzer, thermogravimetric analyzer and infrared spectrum, the micro structure of concrete bridge deck, physic-chemical reaction of the additive materials to concrete are analysed, as well as discussed the ameliorated effects of that to road performance of concrete bridge deck overlays. The technical problems of design and construction on waterproof concrete, fiber concrete and polymer-cement concrete are probed into in this works, and the technology construction of bridge deck overlays is presented. This article also discusses the feasibility on application of waterproof concrete, reticulate polypropylene fiber concrete and PAM modified concrete to bridge deck overlays and analyses the economic and social effects .更多还原