次轻混凝土及预应力技术在预制装配式路面中的应用研究

发布时间：2018-01-26 08:16

本文关键词： 水泥混凝土路面预制拼装技术次轻混凝土预应力混凝土　出处：《河北工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：预制拼装快速修复技术是目前现有修复技术中用时最短、对道路交通影响最小的实用技术,实现了真正意义上的无阻碍交通快速修复技术。但是,预制拼装技术也存在最明显的不足——预制板尺寸问题。路面板尺寸大小直接影响板的自重和拼装后接缝处理,因此,解决预制拼装快速修复技术中路面板尺寸问题,是这项技术逐步完善的关键。文中从解决预制路面板尺寸问题出发,提出采用大尺寸板并能够解决板自重问题的两种方案,主要进行如下方面的研究:1.利用轻集料(页岩陶粒)部分取代粗骨料(碎石),以达到降低混凝土自重的目的。首先,进行页岩陶粒基本性能指标的测定,再根据混凝土工作性、力学性能进行不同陶粒取代率的次轻混凝土比选,确定满足预制路面板工作性、力学性能最优的次轻混凝土。最后,对选定陶粒取代率的次轻混凝土进行干表观密度、表观密度测定,与普通混凝土进行对比分析,验证采用次轻混凝土降低预制路面板自重的程度。同时,进行次轻混凝土耐磨性、干缩性、抗冻性等路用性能试验,验证次轻混凝土应用于预制拼装快速修复技术的可行性。2.利用预应力技术,对预制路面板施加预应力,以提高其承载能力,并且能够减薄板厚,达到节约混凝土用量降低自重的目的。首先,根据弹性设计原则确定预压力度,进行路面整板配筋设计。其次,在文中首次提出一种新型张拉方式施加预应力,并通过试验验证其可行性。最后,为了研究预制预应力混凝土路面板的力学性能,进行比尺试验,对比分析预制预应力混凝土路面板和普通钢筋混凝土路面板的承载能力,以验证预应力混凝土路面板应用于预制拼装快速修复技术的可行性。将次轻混凝土、预应力技术应用于预制拼装快速修复技术,使其得到进一步完善,同时,这种水泥混凝土路面的无阻碍快速修复技术对道路养护具有重大意义,对全国公路、机场道路也具有重要的实用价值。
[Abstract]:The prefabricated fast repair technology is the practical technology which has the shortest time and the least impact on the road traffic in the current repair technology. It realizes the real meaning of the rapid repair technology of traffic without hindrance. However. Prefabricated assembly technology also has the most obvious shortage of prefabricated panel size problem. The size of road panel size directly affects the weight of the plate and joint treatment after assembly, so. It is the key to solve the problem of the size of the road panel in the rapid repair technology of prefabricated assembly. This paper starts with the solution of the problem of the size of the prefabricated road panel. Two schemes which can solve the weight problem of plate with large size plate are put forward. The main research is as follows: 1. The coarse aggregate (crushed stone) is partially replaced by lightweight aggregate (shale ceramsite). In order to reduce the weight of concrete. Firstly, the basic performance of shale ceramsite is measured, and then according to the workability and mechanical properties of concrete, the secondary lightweight concrete with different replacement ratio of ceramsite is compared. Finally, the dry apparent density and apparent density of sub-light concrete with selected replacement rate of ceramsite were determined. Compared with ordinary concrete, the paper verifies the degree of reducing self-weight of precast pavement slab by using sub-light concrete. At the same time, the road performance tests such as wear resistance, dry shrinkage and frost resistance of sub-light concrete are carried out. Verify the feasibility of the application of sub-light concrete in prefabricated quick repair technology .2.Use prestress technology to apply prestressing to the prefabricated pavement slab to improve its bearing capacity and to reduce the thickness of the slab. To achieve the purpose of saving the amount of concrete to reduce the weight. Firstly, according to the principle of elastic design to determine the preloading strength of the whole plate reinforcement design. Secondly, in this paper, the first proposed a new type of tension to apply prestress. Finally, in order to study the mechanical properties of prefabricated prestressed concrete pavement slab, scale test was carried out. By comparing and analyzing the bearing capacity of prefabricated prestressed concrete pavement slab and ordinary reinforced concrete pavement slab, the feasibility of applying prestressed concrete pavement slab to prefabricated quick repair technology is verified. Prestress technology is applied to prefabricated quick repair technology, which is further improved. At the same time, this kind of rapid repair technology of cement concrete pavement without hindrance is of great significance to road maintenance and national highway. Airport roads also have important practical value.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U418.6

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