Papers by Keyword: Physical Parameters

Abstract: The effect of polyketone thermal processing duration on the rheological properties of the melts and the physical and mechanical characteristics of the samples, obtained by injection and compression molding methods, is studied.

Abstract: In order to study the distribution of carbonaceous rocks in Guangxi, and reveal the microstructure of carbonaceous rocks, and explore the laws of physical and mechanical properties of carbonaceous rocks, and study the characteristics of carbonaceous rocks, the Regional division of the typical carbonaceous rocks in Guangxi was carried out. Subsequently, an electron microscopy scan test was conducted to analyze the microstructure characteristics of carbonaceous mudstone, shale and limestone. At the same time, the mineral composition of the carbonaceous rock, the chemical composition test was analyzed, and the physical and mechanical parameters test was conducted. Finally, the microscopic classification of carbonaceous rocks was linked to the physical and mechanical parameters. The results show that: (1) Guangxi carbonaceous rocks can be divided into three typical areas: Hechi District, Baise District and Liuzhou District. (2) The microstructure of carbonaceous limestone in Guangxi was mostly scaly, the mineral crystals of carbonaceous mudstone microstructure were mainly petal-like, and the clay minerals of carbonaceous shale microstructure was striped. (3) The microscopic chemical elements of Guangxi carbonaceous rocks were mainly carbon, silicon, and mineral components were mainly illite, and the illite content was linear with density.

Abstract: The paper presents the fundamental possibility of using ash and slag waste (ASW) of the fuel and energy complex in the production of ceramic bricks using the semi-dry pressing method based on the Buguruslan deposit low-melting aluminosilicate loams. The technological parameters optimization ways (molding moisture, grinding fineness, pressing pressure) in the production of ceramic bricks from low-quality clay raw materials using the experiment mathematical planning method are presented. The separate and joint grinding raw materials mixture rational composition influence on the ceramics technological properties is studied.

Abstract: Availability of raw water is one of the problems faced in the provision of clean water services in Indonesia. The purpose of this study was to determine differences in the quality of ordinary well water and drill water with physical parameters test. The number of samples in this study was 12 drill wells and 12 ordinary wells belonging to residents in the City of Parepare and the total were 12 villages. The parameters observed refer to the Indonesian Minister of Health Regulation Number 479 / Menkes / Per / IV / 2010 concerning Water Quality Requirements and Supervision which includes physical parameters such as turbidity. Data collection methods used in this study were cross sectional analysis in South Sulawesi Provincial Health Laboratory Makassar. Based on the results of the laboratory test for measuring water quality as measured by one of the physical parameters, namely turbidity, there is a difference in value between ordinary wells and boreholes. The turbidity values ​​measured in ordinary wells are 3 villages that do not meet the requirements of clean water quality, where all of the results are above the maximum set level of> 5 NTU, the villages is watang Soreang village, Lompoe village and Galung Maloang village while the turbidity value is measured in drill wells are the result that meets the requirements of clean water quality where the results do not exceed the maximum set level of 5 NTU.

Abstract: In order to improve the accuracy of the rock mechanical parameters, the correlations among physical and mechanical parameters were investigated. A large number of laboratory testing results curried out on 408 rock specimens including metamorphic rocks, sedimentary rocks and igneous rocks. Through the statistical analysis of the laboratory test data, several regression equations among rock material parameters were established. The research suggests that, in addition to Poisson's ratio, the mechanical parameters (unconfined compressive strength (UCS), elastic Young’s modulus, shear modulus) relate well to physical parameters (porosity, P-wave velocity), and the relationships are mainly described by power and exponential correlations which have good squared regression coefficients. The correlation between elastic Young’s modulus and dynamic elastic modulus was established, as well as the relationship between shear modulus and dynamic shear modulus.

Abstract: Investigations of wollastonite and calcium phosphate biocoatings with Zn-and Cu-incorporation produced by a microarc oxidation method were presented. Dependences of coating properties on the microarc oxidation parameters were revealed. A variation of the process parameters allowed us to produce wollastonite-calcium phosphate coatings with a plate-like structure, thickness of 25–30 μm, roughness of 2.5–5.0 μm, and enhanced strength properties. Coatings based on substituted hydroxyapatite deposited under voltages of 200–250 V have an X-ray amorphous structure. An increase of oxidation voltage to 300 V leads to the formation of crystalline phases in the coating, such as CaHPO₄ and β-Ca₂P₂O₇. The maximum content of 0.4 at% zinc and 0.1 at% copper was obtained for coatings based on Zn-and Cu-substituted hydroxyapatites, consequently, deposited under oxidation voltage of 250 V.

Abstract: In order to study the pavement performance of the soil that improved by ionic liquid soil stabilizer, the red-brown clay was concerned as the typical soil, mixed with the ionic soil stabilizer, the ordinary Portland cement and the hydrated lime, was tested to characterize its durability. The engineering classification of the typical soil was determined and the physical parameters of the ionic soil stabilizer was obtained, according to tests of the particle size analysis, crucial water content coefficient, organic matter content, PH, conductivity, plasma emission spectra, etc. In addition, the tensile strength, durability and shrinkage property were analyzed by split tests, freezing and thawing tests, fatigue tests and shrinkage tests. As a result, the typical soil was a kind of low liquid-limit clay, denoted by CL. The ionic soil stabilizer was a water soluble, high conductivity, strongly acidic sulfonated oleoresin. The ion exchange reaction between the soil and the ionic soil stabilizer begun after treating by the ionic soil stabilizer, and then the role of soil particles became stronger. Furthermore, the void between soil particles was decreased, the structure became closer, and then the tensile strength, durability and shrinkage property were improved. As mentioned above, the research provided theoretical foundation and practical support for using the ionic soil stabilizer in China's highway construction.

Abstract: In order to study the treatment mechanism of the ionic liquid soil stabilizer, a series tests were performed for a typical soil, the red-brown clay. The basic physical parameters of typical soil were conducted by variety of tests, including particle size analysis, crucial water content coefficient, loss on ignition, organic matter content, etc. Furthermore, the treatment mechanism of the ionic soil stabilizer was analyzed, involving PH, conductivity, plasma emission spectra, scanning electron microscopy, X-ray diffraction and BET test. The results indicate: Firstly, the ionic soil stabilizer is a sulfonated oleoresin with the features of water soluble, high conductivity and strongly acidic, which exchanged with cations adsorbed on the surface of clay particles to reduce the thickness of hydrated film and the electric double layer thickness. Secondly, it reduced the mutual repulsion energy between soil particles and made the flaky particles of clay minerals contact closely. Finally, it made the particles of clay be close to each other and gradually formed larger particles. Hence, the clay became denser. Therefore, the research provided a theoretical foundation and practical basis for the wide application of the ionic soil stabilizer in China's highway construction.

Abstract: Red sandstone with a strong water softening can cause difficulties of construction projects, especially for slope excavation and support engineering. Therefore, the study on the engineering properties of saturated red sandstone has a important meaning. The mechanical parameters of saturated red sandstone are obtained by the triaxial compression tests. The test results indicate that the ralations between peak strength, elasticity modulus and confining pressure for the saturated specimens are similar with the natural specimens, that is, with the increasing of confining pressure, the peak strength and the elasticity modulus will increase, but the growth rate becomes slowly. Under the same confining pressure, the peak strength and the elasticity modulus of saturated specimen are more smaller than the natural one. The mechanical damage caused by water recedes when the confining pressure increases, so for the geotechnical engineering with larger influence of water, the increasement of confining pressure by the supporting structures is conducive to the stability of rock mass. The research results will provide a theoretical basis for the red sandstone engineering.

Abstract: This paper introduced engineering geological conditions of Xingheng highway, analysising, elaborated the adverse geological and special engineering geological problems along the highway, and conducted the engineering geological evaluation accordingly.