Papers by Keyword: Grain Composition

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Authors: Ming Yue Zheng, You Fu Guo, Jing Long Bu, Yue Jun Chen, Li Xue Yu, Zhi Fa Wang
Abstract: Silicon carbide with diffierent granularity and three grain composition was used as raw material. Silicon carbide refractory material was prepared in oxidizing atmosphere at 1400 °C, 1450 °C and 1500 °C for 3 h. Performence of samples were researched by measurements of apparent porosity, bulk density, bending strength at room temperature, thermal shock resistance and thermal expansion rate, and analyzed by SEM. The results showed that samples sintered at 1400 °C have low thermal expansion rate and apparent porosity, high bending strength and bulk density, good thermal shock resistance, compact texture as well. It can be deduced that (1.0-0.5mm) / (0.5-0.1mm) / (45μm) / (5μm) = 50 / 17/ 20/ 13 is the best grain composition to improve integrated performance of silicon carbide refractory material.
Authors: Wen Xu, Fei Guo, Qian Tian
Abstract: An experimental investigation was carried out to evaluate the effect of limestone filler (LF) with equivalent replacement of cement on its grain composition. The results indicated that LF optimized cement particle distribution, filled the empty place among cement particles and released more free water when mixing. With the decrease of the LF particle size and the increase of LF replacement ratio of cement, these effects were more remarkable. As a result, the finer and the more replacement ratio of the microfiller, the lower the flow resistance and plastic viscosity of the mixture from a rheological point of view.
Authors: Ya Bing Huang, Yan Jun Li, Tan Jiao
Abstract: As an important factor that affects the compaction characteristics of the coarse grained fillers in the high speed railway subgrade, the grain composition is characterized by the application of the fractal theory. Several types of the coarse grained fillers were selected for testing and the results indicated that the relationship actually exists between the compaction characteristics and the fractal dimensions. The variation law of the maximum dry density fluctuating with the quality fractal dimension was analyzed and the results were supposed to estimate the compaction characteristics of the coarse grained fillers.
Authors: Chang Ming Hu, Li Fang Wang, Hong Liang Liu, Jia Yang Zhu
Abstract: Taiyuan is a city with more moutains, less loess resource and abundant coal gangue. This paper studied the feasibility of turning coal gangue into filling in Taiyuan region, based on successful experience home and abroad. A series of tests on physical-chemistry properties and mechanical characteristics of the coal gangue proved that coal gangue used in the experiment has good chemical properties, grain composition. The coal gangue is a kind of non-sticky coarse grained soils which can drain off water freely, and it can be used as the filling of foundation. Based on tests, this article provided a theoretical basis and a favorable reference for engineering application of coal gangue and its research and development in other areas.
Authors: Qun Liu, Xiang Bo Deng
Abstract: Coarse-grained soil is widely used in railway construction, and it is of great significance to take research on how compression deformation characteristics affect deformation of coarse-grained soil in high filled subgrade. To analyze compression deformation characteristics of coarse-grained soil under different moisture content and different grain compositions conditions, influence pattern of moisture content and grain compositions was researched through uniaxial compression test. The result indicates that compressive deformation is in logarithm relation with time; moisture content and grain compositions are important factors that affect the characteristics of compressive deformation of sandy slate coarse-grained soil and it is better to control subgrade settlement with dry or saturated coarse-grained soil which contains 70% coarse particles.
Authors: Qi Jin Li, Guo Zhong Li
Abstract: The construction waste was processed into recycled aggregate and was used to substitute for natural aggregate to produce concrete small hollow block with grade of MU7.5. The effect of grain composition, replacement ratios and chemical activator of recycled aggregate on compressive strength of concrete small hollow block was studied. The results shows that through optimized grain composition of recycled aggregate and mixed with appropriate chemical activator, the compressive strength of concrete small hollow block with 100% recycled aggregate can be satisfied with the requirement of MU7.5 concrete small hollow block.
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