scholarly journals Evaluation on Uniaxial Compression Strength of SSG Method with Curing Condition

2016 ◽  
Vol 17 (2) ◽  
pp. 15-20
Author(s):  
Yong-Sung Choi ◽  
Byoung-Il Kim ◽  
In-Jong Moon ◽  
Jun Heo
Keyword(s):  
Uniaxial Compression ◽  
Compression Strength ◽  
Uniaxial Compression Strength ◽  
Curing Condition

scholarly journals Specific Energy of Hard Coal Under Load

2015 ◽  
Vol 37 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Anna Bogusz ◽  
Mirosława Bukowska
Keyword(s):  
Kinetic Energy ◽  
Total Energy ◽  
Uniaxial Compression ◽  
Specific Energy ◽  
Compression Strength ◽  
Longitudinal Strain ◽  
Full Range ◽  
Dissipated Energy ◽  
Uniaxial Compression Strength ◽  
Recoverable Energy

Abstract The article presents results of experimental tests of energy parameters of hard coals under loading, collected from research sites located within five main geologic structures of Upper Silesian Coal Basin (GZW) - Main Trough, Main Anticline, Bytom Trough, Rybnik Trough and Chwałowice Trough. Coals from12 mines were analysed, starting with seams of group 200, through groups 400, 500, 600 and, finally, seams of group 700. Coal of each of the groups of seams underwent uniaxial compression stress of the energy parameters, in a servo-controlled testing machine MTS-810NEW, for the full range of strain of the tested coal samples. Based on the tests the dependence of different types of specific energy of longitudinal strain of coals on the value of uniaxial compression strength was determined. The dependence of the value of dissipated energy and kinetic energy of coals on the uniaxial compression strength was described with a linear function, both for coals which due to their age belong to various bed sand for various lithotypes of coal. An increase in the value of dissipated energy and in kinetic energy was observed, which was correlated with an increase in uniaxial compression strength of coal. The share of dissipated energy is dominant in the total energy of strain. Share of recoverable energy in the total energy of strain is small, independent of the compression strength of coals and is at most a few per cent high. In coals of low strength and dominant share of dissipated energy, share of recoverable energy is the biggest among the tested coals. It was shown that following an increase in compression strength the share of recoverable energy decreases, while the share of dissipated energy in the total energy increases. Further studies of specific energy of longitudinal strain of rocks in the full-range strain will be the next step inperfecting methodology of research into natural rock burst susceptibility of Carboniferous rock mass and changes in the susceptibility resulting from mining activity.

Influence of the Dry Bulk Density on the Properties of Ceramic Paver Body

2014 ◽  
Vol 805 ◽  
pp. 536-540
Author(s):  
Veronica Scarpini Candido ◽  
Regina Maria Pinheiro ◽  
Sergio Neves Monteiro ◽  
Carlos Maurício Fontes Vieira
Keyword(s):  
Water Absorption ◽  
Bulk Density ◽  
Uniaxial Compression ◽  
Compression Strength ◽  
Technological Parameter ◽  
Uniaxial Compression Strength

This work has as its objective to evaluate the influence of the dry bulk density in precursor body formulations developed to fabricate ceramic paver. Cylindrical specimens were uniaxial press-molded into two dry bulk density ranges, 1.99-2.05 g/cm3and 2.18-2.23 g/cm3, from three formulations elaborated with clays, argillite and grog and then fired at 850 and 950oC. The evaluated properties were: water absorption and uniaxial compression strength. The results indicated that the packing during the forming stage is an important technological parameter that significantly influences the evaluated properties.

scholarly journals Mechanical Behavior of Frozen Porous Sandstone under Uniaxial Compression

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Hong-Ying Wang ◽  
Qiang Zhang
Keyword(s):  
Tensile Strength ◽  
Longitudinal Wave ◽  
Uniaxial Compression ◽  
Wave Velocity ◽  
Compression Strength ◽  
Peak Strain ◽  
Secant Modulus ◽  
Longitudinal Wave Velocity ◽  
Uniaxial Compression Strength ◽  
Porous Sandstone

The influence of low temperature on longitudinal wave velocity, uniaxial compression strength, tensile strength, peak strain, secant modulus, and acoustic emission characteristics of yellow sandstones was studied. The results show that the secant modulus increases with decreasing temperature when the axial strain is less than 0.6%, and a contrary influence performs for the subsequent stage due to the fracture of the pore ice. With the decrease in temperature, the uniaxial compression strength first increases and then remains at a relatively constant value of 34.44 MPa at about -40°C while the temperature ranges from -40°C to -70°C. The tensile strength shows an approximate linear increment as the temperature. The peak strain gradually increases with temperature in a three-stage piecewise linear form, and the increasing rate gradually decreases with the decreasing temperature. The phase transformation from liquid water at a temperature of 20°C to solid ice at a temperature of -3°C significantly increases the longitudinal wave velocity from 1.55 km/s to 3.36 km/s. When the temperature is lower than -10°C, the longitudinal wave velocity approximately increases linearly at a rate of 2.67 × 10 − 3   km / s · ° C − 1 with decreasing temperature.

THE INFLUENCE OF CLASSIFICATION PARAMETERS UNCERTAINTY ON ROCK MASS QUALITY ASSESSMENT

2020 ◽  
Author(s):  
Ahmed Mušija ◽  
Kenan Mandžić
Keyword(s):  
Rock Mass ◽  
Uniaxial Compression ◽  
Compression Strength ◽  
Working Environment ◽  
Uniaxial Compression Strength ◽  
Adequate Model ◽  
Geotechnical Characteristics ◽  
Road Tunnels ◽  
The Stability

The construction of underground objects is a very complex task that takes into account a large number of input parameters that affect the process of building and stability of underground objects during the exploatation. Engineering geological and geotechnical characteristics of the rock mass represent the basic input data for the development of an adequate model and assessment of the quality of the rock mass, and thus the assessment of the primary support that will ensure the stability of the rock mass during construction. In order to more clearly define the quality of rock mass as a working environment, various classifications have been developed in the world that analyze the influencing factors and give an assessment of the quality of rock mass. Uniaxial compression strength and the influence of groundwater appear as parameters in the RMR classification of rock mass. The paper presents the problems of adequate definition of uniaxial compression strength parameters and influence of groundwater in construction of road tunnels.

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