【作者】 罗立峰；

【导师】 韩大建； 王秉纲；

【作者基本信息】 华南理工大学 ， 结构工程， 2002， 博士

【摘要】 目前正在运营的混凝土公路桥有32％在结构上或功能上有问题，而在这众多有问题的桥中，许多是由于混凝土桥桥面铺装的失效导致有害物质的下渗而引起的。近年来，公路桥梁已出现多起竣工通车不久即大规模或全线整修桥面铺装，引起当地政府和公众媒体的极大关注，成为设计施工与管理部门极为关注的课题之一。 不同于道路铺装，桥面铺装通常没有结构性的目的，它们的目的主要是用于提高桥面的耐久性和服务寿命。影响桥面耐久性和服务寿命的主要因素是被侵蚀性物质贯穿桥面的速度，也就是混凝土的渗透性。除了孔隙率之外，混凝土的渗透性是被已经存在的裂缝控制的。因此，铺装设计的主要目标是控制裂缝并将裂缝减至最小：一个设计良好的桥面铺装系统应符合下面要求：(1)高的耐久性；(2)低的渗透率；(3)对剥离和脱空具有高的抵抗力；(4)10年以上的免维护保养。将以上四点要求具体化，桥面铺装设计可总结为三个方面：(1)桥面铺装的材料类型；(2)桥面铺装厚度的确定；(3)桥面铺装的施工工艺。本文就以上三个方面，针对水泥基混凝土桥面铺装进行了研究。 1．钢纤维增强聚合物混凝土铺装材料(SFRPC)的开发 钢纤维增强聚合物混凝土(SFRPC)，它克服了聚合物改性混凝土与钢纤维混凝土的缺点，吸收了两者的优点，形成包括高强度、高抗冲击能力、高延展性、优秀的裂缝控制、高耐久性和低渗透率等优良性能，并且施工相对容易。试验证明是一种理想的桥面铺装材料。象所有铺装材料一样，SFRPC铺装必须被正确地设计、制备及施工以发挥其潜在的能力。 2．设计方法 根据实验研究、数值分析及结构的线弹性理论，考虑桥面铺装层的功能要求，对铺装层的受力状况进行了简化并提出了若干假定。在此基础上，提出以梁板体的最大弯矩为基础，以桥面铺装开裂和剥离为控制指标的水泥混凝土桥面铺装设计方法。 3．桥面铺装的施工 钢纤维增强聚合物混凝土桥面铺装施工的关键是：(1)如何处理好桥面铺装层上表面，满足行车质量要求；(2)如何处理好桥面铺装层下表面，使之与其下的梁板体粘结牢固。本文探讨了施工时如何处理这两个面，使其达到设计要求，最后在总结工程实践与分析理论的基础上，归纳出施工该类桥面铺装的施工工艺及施工流程。更多还原

【Abstract】 It is reported that 32% of bridges in service are structurally or functionally deficient in present. The deficiencies are usually due to aggressive agents penetrating into the concrete deck. In recent years, deck pavements of some highway bridges are needed to repair soon after opening to traffic. These problems are of great concern to the government and the public. They also become hot issues to departments of design construction and administration.Unlike the pavement overlays, bridge deck overlays typically have no structural purpose. They are primarily used to improve the durability and to extend the service life of the bridges deck. Bridge deck overlays are most designed based on previous empirical knowledge. One of the main factors affecting the durability and service life of a bridge deck is the speed by which aggressive agents penetrate into the concrete deck. In addition to porosity, concrete permeability is dominated by the presence of cracks. Hence, the main goal in bridge deck pavement design is to control and minimize cracking. A well-designed bridge deck overlay system should meet the following requirements: (1) high early and long-term strength; (2) very low permeability; (3) high resistance to debonding or delamination; and (4) maintenance-free service for over 10 year. The main factors in overlay design are (1) material type; (2) overlay thickness; and (3) bonding between the overlay and the bridge deck, which are related to the technology in construction. This paper is concerned with the above three problems for the cement concrete bridge deck pavement.1. Development of steel fiber reinforced polymer concrete(SFRPC) pavement materialSteel fiber reinforced polymer concrete(SFRPC), can overcome the shortages in the polymer-modified concrete and steel fiber concrete, but keep their merits. So, SFRPC has high strength, high impact resistance, high ductility, high crack control, high durability, low permeability and relatively easy construction. Thus, it is ideally suitable for being bridge deck pavement material.2. Theory and DesignBased on experiment of research, the numerical and elastic analysis, this thesis takes into account of the demands of the cement concrete bridge deck pavement, simplifies the loads applied on the pavement and then makes some assumptions according to the realistic conditions. The author then puts forward a design method, which is based on the maximal bending moment of bridge, and takes the crack and fracture of cement concrete bridge deck pavement as a control index.更多还原