large amount of granite powders wastages were produced during the process of the stone processing, therefore the research on recycling and utilizing the wastages was carried out. Based on the size distribution of granite powders specified by the laser particle size analyzer, the research on the influence of granite stone powder on the mechanical properties of cement mortar was carried out through the cement grinding test and scanning electron microscopy (SEM). The test result shows as follows. The flexural and compressive strength of cement mortar with replacement rate of granite stone powders of 20% is the highest when the same particle size of granite stone powder is incorporated. When the replacement rate of granite powders is the same, the smaller the particle size of granite stone powder is, the higher the flexural and compressive strength of cement mortar is. When the replacement rate of granite powders is 20%, with the particle size ranging from 0μm to 45μm, the filling effect of the granite stone powder can be fully utilized to the best.
The experimental research on the effect of different incorporation of granite powders on the workability, mechanical property and impermeability performance of concrete is carried out. The result show that the concrete with an appropriate dosage of granite powder exhibits favorable workability, impermeability performance and cohesiveness. And granite powders agree with cement-based materials. Within some dosage of granite powders, the compressive strength of the mixture is approximate to that of common concrete. When the 10% of cement was replaced by the granite powder, good impermeability performance exhibits, with the relative permeability coefficient 30% lower than that of common concrete.
In this paper, p-n coupled photocatalyst CoO/CdS/TiO2 was prepared by method of impregnation. The structure and optical properties of CdS/TiO2 and CoO/CdS/TiO2 were characterized by XRD, SEM, BET and UV–vis DRS. The photocatalytic activities of the photocatalysts were evaluated by photocatalytic degradation of methyl orange, and the effect of photocorrosion of CdS in CoO/CdS/TiO2 was investigated by analyzing the cadmium concentration in the supernate collected after photocatalytic reactions. The results showed that p-n coupled photocatalyst CoO/CdS/TiO2 not only showed higher efficiency in degradation of methyl orange than CdS/TiO2, but also exhibited resistance against cadmium leakage under light irradiation. The mechanism of the photocorrosion-delaying by p–n junction was also discussed.
The tunnel excavation destroys rock stress state and when concentrated stress exceeds the strength of surrounding rock, the tunnel periphery rocks will be destroyed. And the effective bearing ring will be soon instable and it needs to be supported. Blot-grouting support is an active support method which organically combines shotcreting support and grouting consolidation and its theoretical research achievements are less. This paper, starting from catastrophe theory, established catastrophe instability model of blot-grouting support body and it also obtained the mechanic judgment criterion of blot-grouting support body damage and the regular pattern of the point (N, q)’s motion tract in the controlling space, of which the influence to the rock stability. And the paper also judged the minimum thickness of blot-grouting support body in the point of catastrophe stability model to provide the basis for theoretical calculation and engineering application.
In this paper it is shown that compacted wheat straw block is a cost effective building material in China. Wheat straw is renewable resource and ecological material, when used as building material; it is less energy and material consumption. The compacted wheat straw block has a small thermal diffusivity and good fire resistance. The hydraulic properties will guarantee a comfortable humidity of in door air, and protect the material from rot, and ensure the durability of the construction. The mechanical properties will also increase the structure safety. It is absolutely a cost effective building material.
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