高性能煤矸石混凝土性能的研究
[Abstract]:Coal gangue is a kind of industrial waste in the process of coal mining and oil refining. It not only occupies a large amount of land but also spontaneously combusts under certain conditions, causing serious environmental pollution to the atmosphere and groundwater. At present, some coal gangue is mainly used as raw materials to prepare ceramics, refractories and cement, but the effective utilization of coal gangue is still less than 70%. With the development of social economy, environment and resources, the harmless application of coal gangue has been widely concerned, especially to realize its remarkable social value, environmental value and cement value. Coal gangue contains oxides such as Fe2O3, TiO2, K2O, Na2O and CaO, and its main mineral composition is kaolinite. Calcination and nature of coal gangue lead to the dehydration and decomposition of kaolinite, making it have pozzolanic activity, so coal gangue can partly replace aggregate to prepare green high performance concrete. The physical properties of coarse aggregate, including gradation, apparent density, water absorption, crushing index, mud content and so on, are analyzed by XRD. The optimum substitution range of coal gangue and the suitable range of water-binder ratio, water reducing agent dosage, silica fume dosage and other factors are found through the study of basic experiment. The optimum mixing ratio of gangue concrete is obtained. The effects of water binder ratio, gangue content, water reducing agent content and silica fume content on the workability, mechanical properties, chloride ion permeability and carbonation resistance of high performance gangue concrete are studied. Finally, the microstructure of gangue concrete is observed by SEM. The experimental results show that the coal gangue has a large mud content, which is one of the main factors affecting the workability. The apparent density and crushing index of the coal gangue are close to the crushed rock. The average strength of C50 concrete reaches 54 MPa in 28 days. The mechanical properties of the concrete with 40%-60% coal gangue are the best. The compressive strength of coal gangue concrete can reach 54.71 MPa under the optimum proportion. The water absorption rate of coal gangue is higher, which has certain influence on the workability. High water binder ratio and low silica fume content can improve the work of coal gangue concrete under the optimum ratio. The slump of the concrete can reach 190mm. Among the four orthogonal experimental factors, the water-binder ratio and silica fume content have remarkable influence on the chloride ion permeability and carbonization performance, followed by the coal gangue content, while the water reducer content has little effect. Under the optimum proportion, the electric flux of coal gangue concrete can reach 943.25C in 6 hours, and the same proportion. Under the optimum proportion, the carbonation depth of coal gangue concrete can reach 4.1 mm in 28d, which is close to the carbonation depth of ordinary concrete in the same proportion. The influence of coal gangue content on the shrinkage of concrete is more serious. In this experiment, when the coal gangue content is 40%, the concrete can not only be guaranteed. The chloride ion penetration resistance and carbonation resistance of gangue concrete are studied, and the shrinkage of concrete is reduced to the minimum. SEM analysis shows that gangue concrete has a relatively compact structure. The pozzolanic effect of spontaneous combustion gangue participates in hydration reaction, forming network calcium silicate gel and entering the gap between aggregates. Row filling can make the whole structure of gangue concrete more compact, thereby reducing and reducing the transmission speed and transmission channel of chloride ion and CO2 in gangue concrete, and improving the durability and compressive strength of gangue concrete.
【學(xué)位授予單位】:沈陽建筑大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TU528
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