尾礦砂PVA水泥基復(fù)合材料的制備及耐久性試驗(yàn)研究
[Abstract]:The PVA fiber cement matrix composite of tailing sand is used to replace fine aggregate and cement with large proportion of tailings and fly ash from two aspects of saving resources and improving performance, and the preparation technology of ECC is used for reference. To explore the development of environmental-friendly high-performance cement-based composites. A large number of experiments on mechanical properties of this material have been done in the earlier period of the research group. The results show that the material has good mechanical properties and engineering application prospects, but the durability of the material is less studied. Therefore, on the basis of the previous work, the preparation technology and the durability of the composites, such as frost resistance, impermeability, carbonation resistance and sulfate corrosion resistance, were studied. The volume ratio of PVA fiber and the ratio of water to binder are studied from the mixture ratio of PVA fiber cement matrix composites of tailings sand, and the freezing resistance and permeability resistance of PVA fiber cement matrix composites with tailings are studied. The effects of carbonation resistance and sulfate corrosion resistance provide scientific basis for the development of iron tailings and the extension and application of cement matrix composites in engineering. The main research contents and conclusions are as follows: (1) the raw materials for the preparation of PVA fiber reinforced cement matrix composites are determined by the selection of experimental raw materials, mix ratio and mixing system. Reasonable mix ratio of key materials and its mixing system. (2) the mass loss and compressive strength loss of tailings PVA fiber reinforced cement matrix composites under different freezing and thawing cycles were studied through laboratory freeze-thaw test. The results show that the freezing resistance of tailing sand cement-based composite with fiber is better than that of PVA fiber reinforced cement matrix composite without fiber, and the optimum volume addition of fiber is given. The freezing resistance of tailing PVA fiber reinforced cement matrix composites decreases with the increase of water-binder ratio. The impermeability of tailings PVA fiber reinforced cement matrix composites under the constant water pressure of 1.2MPa is studied. The results show that the impermeability of tailings sand cement matrix composites can be improved by adding a certain volume of fibers. However, with the increase of fiber content to a certain extent, the impermeability of the material decreases, and with the increase of water-binder ratio, the impermeability of the material decreases gradually. (4) through the rapid carbonization test method in the laboratory, The carbonation resistance of PVA fiber reinforced cement matrix composites with tailings was studied. The results show that the natural carbonization of PVA fiber reinforced cement matrix composites with a replacement ratio of 50 ore tailings will not reach the surface of reinforcement during the life of structural design. It can effectively improve the carbonation resistance of tailings sand cement matrix composites, and decrease gradually with the increase of water-binder ratio. (5) the corrosion tests of sulphate dry and wet cycle corrosion are carried out. The corrosion resistance of tailings PVA fiber reinforced cement matrix composites is studied. The results show that the corrosion damage rate of tailings PVA fiber reinforced cement matrix composites is faster than that of dry and wet cycling environment. Adding a certain volume fiber can effectively improve the sulfate corrosion resistance of tailings cement matrix composites, and give the optimal volume addition of fiber, and with the increase of water / binder ratio, the corrosion resistance of the composite decreases gradually.
【學(xué)位授予單位】:沈陽(yáng)工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TB332
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