فهرست مقالات elasticity modulus

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  1 - Examining the Mixing Plan and the Results of the Plastic Concrete
  Abolfazl Ostovarzijerdi Akbar Ghanbari Mohammad Karkon
  10.22094/jseg.2021.688675
  In order to control seepage from the dam, various methods are used to reduce water seepage. One of the methods of reducing the permeability of the water according to its material is building cut-off walls and filling them with plastic concrete materials. In this study, چکیده کامل

  In order to control seepage from the dam, various methods are used to reduce water seepage. One of the methods of reducing the permeability of the water according to its material is building cut-off walls and filling them with plastic concrete materials. In this study, it has been tried to study the mixing plan of the plastic concrete in the main body of the Nargesi dam’s cutoff wall and to determine the results of compressive strength and elasticity modulus of 108 panels of cut-off wall in different ages in this project. Due to the individual concreting of each panel from the cutoff wall, the results of the plastic concrete panels at runtime are somewhat different. Due to the sensitivity of the plastic concrete to the dispersion of the results, considering that the cutoff wall should have a seamless function as well as the sensitivity of the concrete over time, it seems necessary to address this issue in an operational project. The results indicate that the growth rate of elastic modulus in a period of time is less than the growth rate of the compressive strength, and in other words, the plasticity of the concrete is changed less over time. پرونده مقاله
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  2 - Investigation of Stress-Strain Behavior of Plastic Concrete Using Monotonic Triaxial Compression Tests
  y. Pashang pisheh seyed majddin Mir mohammad hosseinib
  In this paper, the mechanical behavior of plastic concrete being used in the cut-off walls of earth dams has been studied. To do the task, triaxial compression tests on the specimens in various ages and mix designs under different confining pressures have been done and چکیده کامل

  In this paper, the mechanical behavior of plastic concrete being used in the cut-off walls of earth dams has been studied. To do the task, triaxial compression tests on the specimens in various ages and mix designs under different confining pressures have been done and the stress-strain behavior of such materials and their strength parameter changes has been experimentally investigated. It has been observed that increasing the confining pressures applied on the specimens causes the material behavior to be alike the more ductile materials and the compressive strength increases considerably as well. Moreover, a parametric study has been carried out to investigate the influence of essential parameters affecting the shear strength parameters of these materials. According to the research, increasing the coarse to fine aggregates ratio leads to the increase of compressive strength of the specimens as well as the increase of the cohesion and internal friction angle of the materials. Furthermore, the bentonite content decrease and the cement factor increase results in an increase of the cohesion parameter of plastic concretes and decrease of the internal friction angle of such materials. پرونده مقاله
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  3 - Estimating an appropriate plastic concrete mixing design for cutoff walls to control leakage under the earth dam.
  A Pashazadeh M Khosravi N Ganjian
  Making use of concrete materials in cut-off walls, because of their low permeability and standing high Hydraulic Gradient caused by underground drainage, has attracted great amount of attention. Using ordinary concrete with high elasticity modulus, compared to other mat چکیده کامل

  Making use of concrete materials in cut-off walls, because of their low permeability and standing high Hydraulic Gradient caused by underground drainage, has attracted great amount of attention. Using ordinary concrete with high elasticity modulus, compared to other materials may accompany with problems including brittleness of cutoffs due to dynamic stresses.To solve this problem, adding a certain percentage of clay (Bentonite) to plastic concrete materials reduces the concrete hardness as well as its elasticity coefficient, resulting in better ductility. Adding Ebonite (clay and excavation mud) decreases the possibility of hydraulic failure and cracking.In this article components of the plastic concrete and parameters which affect in properties and manners of its mixing design is analyzed. Based on the results that have been obtained from experiments on plastic concrete samples which have various mixing plans, diagrams have been presented to obtain a mixing plan of ideal plastic concrete with different characteristics which result in determining a key relationship in order to estimate mixing plan of an appropriate plastic concrete of cutoffs to control leakage under the dam. While under current situation, not using these relationships to estimate mixing plan of an appropriate plastic concrete of cutoffs in order to control leakage under the dam is costly and time consuming with considerable amount of errors. پرونده مقاله