scholarly journals STRESS-STRAIN RELATIONSHIP FOR CONCRETE UNDER HIGH TRIAXIAL COMPRESSION : Part 1 Static loading

1988 ◽  
Vol 389 (0) ◽  
pp. 99-108 ◽  
Author(s):  
HIROSHI YAMAGUCHI ◽  
KAZUO FUJIMOTO ◽  
SETSURO NOMURA
Keyword(s):  
Static Loading ◽  
Triaxial Compression ◽  
Stress Strain ◽  
Strain Relationship

scholarly journals Stress-strain Relationship in Homogeneous and Two-layered Triaxial Test Specimens

2020 ◽  
Author(s):  
Gabriel Oliveira ◽  
Isabel Falorca
Keyword(s):  
Soil Mechanics ◽  
Triaxial Compression ◽  
Nonlinear Behavior ◽  
Confining Pressure ◽  
Test Method ◽  
Compression Tests ◽  
Stress Strain ◽  
Triaxial Apparatus ◽  
Strain Relationship ◽  
The Stability

The stress-strain relationship of a homogeneous specimen, obtained from triaxial compression test, allows to determine stiffness parameters for numerical-method based analyses in common geotechnical software. Stiffness parameters are defined as the ratio of stress to strain along an axis. However, when a heterogeneous specimen is tested, the equivalent elastic modulus that represents a simplification of the nonlinear behavior is complex. This paper presents a study intended to contribute to the debate about the degree to which conventional soil mechanics approaches can be applied to layered specimens. Triaxial compression tests were carried out on both homogeneous and two-layered specimens under a low effective confining pressure of 30 kPa. The triaxial apparatus was chosen since the applied stress and specimen boundary conditions are well defined, and the repeatability of the test method is good. The behavior of both specimens was studied in terms of the stress-strain relationship and stiffness. The main differences were crucial to understanding the composite soil-aggregate interaction, which is discussed and compared. The results indicate that the interface between composite soil and aggregate is important to keep the stability of the layer of aggregate over the soft composite soil, and practical methods of achieving that are suggested.

Experimental and Theoretical Studies on Compressive Stress-Strain Relationship of Phosphogypsum-Lime-Flyash-Gravel Mixture

2010 ◽  
Vol 113-116 ◽  
pp. 1865-1869
Author(s):  
Wei Wang ◽  
Shi Long Wu ◽  
De Xi Yang
Keyword(s):  
Model Simulation ◽  
Triaxial Compression ◽  
Strain Curve ◽  
Sustainable Utilization ◽  
Experiment Data ◽  
Stress Strain ◽  
Strain Relationship ◽  
Strain Stress ◽  
Relationship Of ◽  
Experimental And Theoretical Studies

Phosphogypsum-lime-flyash-gravel mixture (PLFG) is usually used to strengthen road foundation of geotechnical engineering. It is important to correctly understand its compressive behavior before corresponding design. In this present paper, triaxial compression test on PLFG was carried out, and its stress-strain curve was investigated. Experiment data show that PLFG is with high bearing capacity and good stiffness. A new composite-exponent model was established, which is available for both hardening and softening type strain-stress curves of PLFG. Finally, comparison between PLFG tested data and new model simulation was performed, and good agreements have been found. This research is helpful for engineering sustainable utilization of phosphogypsum to bring economy and to reduce environmental pollution.

Effect of Confining Pressure on Modeling High Early Strength Concrete under Uniaxial Loading

2006 ◽  
Vol 321-323 ◽  
pp. 367-370
Author(s):  
Bo Hwan Oh ◽  
Hong C. Rhim ◽  
Hyo Seon Park
Keyword(s):  
Axial Stress ◽  
Triaxial Compression ◽  
Concrete Strength ◽  
Confining Pressure ◽  
Plastic Strain Rate ◽  
Deformation Model ◽  
Stress Strain ◽  
Strength Concrete ◽  
Strain Relationship ◽  
Early Strength

Better understanding of concrete behavior is beneficial to the determination of concrete strength and detection of cracking using nondestructive testing techniques such as ultrasonic and acoustic emission. For advanced nondestructive evaluation of high early strength concrete under triaxial compression loading, stress-strain relationship in axial as well as in radial directions needs to be described in explicit form. This paper presents empirical models developed for high early strength concrete under active confinement to explore the effect of confining pressure. Empirical model for axial stress-strain relationship is determined first. Transverse deformation model is automatically generated from the given axial stress-strain model using plastic strain rate. Parameters used in the model are identified and their recommended values are provided. Compressive strength of 24 MPa and 45 MPa concretes are considered along with four different levels of confining pressures.

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