裝配整體式混凝土結(jié)構(gòu)連接界面區(qū)氯離子傳輸特性
[Abstract]:The development of prefabricated buildings has become a national strategy in the field of architecture, and the assembly of integral concrete structures is still the main force. However, the durability of this kind of structure is seldom concerned. Due to the existence of physically discontinuous interface regions, a series of durability problems such as corrosion, corrosion and resistance degradation are caused. Therefore, the durability characteristics of the interface zone of assembled integral concrete structures are studied, which can enrich the durability theory of concrete structures and promote the application and development of assembly concrete structure technology. It is of great academic and engineering value to improve the low carbonization level of the whole life of the building structure. In this paper, based on the durability problem of monolithic concrete structure assembled in chloride environment, the key premise of physical discontinuity in new and old concrete interface region is grasped, and the fundamental problem of chloride transport behavior in the connection interface region is discussed. The corrosion characteristics and mechanism of chloride ion in precast and post-cast concrete interface zone under different interface roughness, different compressive stress and different crack width are revealed in the assembly integral concrete structure, so as to study the corrosion of reinforcement in the interface zone. The study of durability problems such as structural resistance degradation and structural life prediction is the foundation. The basic characteristics of the distribution and evolution of chloride ion concentration with space and time in the interfacial zone were obtained by means of three different interface roughness (average sand filling depth 1-2mm 6-7mm and 11-13mm) and two different erosion periods (60d ~ 180d). The results show that the concentration of chloride in the interfacial region is significantly higher than that in the non-interfacial region. Accordingly, the interfacial effect of chloride concentration distribution and its quantitative expression method (interfacial effect index) are defined. According to the analysis of the interfacial zone effect index, it is found that with the increase of erosion depth, the interfacial zone effect increases, the interfacial zone effect decreases with the increase of erosion time, and the influence of interfacial roughness on the interfacial zone effect shows the characteristics of two ends between middle and small. That is, the interfacial zone effect of 1-2mm and 11-13mm is close, and larger than that of 6-7mm. Three different compressive stresses (0 0. 4 fc) and two different erosion periods (60 d ~ 180 d) were used to study the dry and wet cycling erosion of chloride ions, and the results were analyzed by using the interface zone effect index defined above. The influence of compressive stress level on the distribution and evolution of chloride ions in the interface region is obtained. It is found that the existence of compressive stress decreases the interfacial zone effect, and the greater the compressive stress is, the smaller the interfacial zone effect is. On the other hand, the erosion of chloride ions in the interface area is aggravated. The dry and wet cycling erosion tests of chlorine ions under three different interface crack widths (0 ~ 50 mm ~ 200 mm) and two different erosion periods (60 d ~ 180 d) were carried out, and the results were analyzed by using the interfacial zone effect index defined above. The influence of cracking degree on the distribution and evolution of chloride ions in the interface region is obtained. It is found that the existence of cracks at the interface increases the interfacial effect of chloride ion transport, and the wider the crack width, the greater the degree of improvement.
【學(xué)位授予單位】:中國礦業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU37
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