Uniaxial Compressive Stress-Strain Behavior of Self-Compacting Concrete With High-Volume Fly Ash

Abstract

ABSTRACT:Complete stress-strain behavior is a fundamental characteristic of concrete from which principle parameters in the analysis and design of structural concrete elements are developed. It is recognized that the stress-strain behavior of concrete under uniaxial compressive loading is influenced by the concrete constituents. A special type of concrete, i.e. self-compacting concrete (SCC) incorporating high-volume fly ash, has different constituents to that of conventional concrete. For this reason, characterization of the complete stress-strain behavior of this type of concrete is necessary for reliable analysis, design, and utilization of this concrete as a structural element. This research aims to investigate the complete stress-strain behavior of SCC, incorporating a variety of high-volume fly ash (50-70% by weight of total binder) under uniaxial compressive loading. The compression tests were carried out on cylinder specimens of 75×150 mm, where the deformation was controlled at a rate of 1.5mm/min. The results show that at a stress below 60% of peak value, there is a linear relationship of stress and strain. In this state, both global and local longitudinal deformation is quite similar. However, above this stress level, a nonlinearity of the stress and strain relationship exists and local deformation at the fracture zone is higher than global deformation. Various stress-strain models have been used to capture the complete stress-strain diagram of the investigated concrete, using key parameters of the diagram as inputs. Most of the models give a better prediction in the ascending part compared to that of the descending branch. In general, Samani and Attard's model gives the lowest coefficient of variation of error than other models.

Experimental Study of Rubberized Concrete Stress-Strain Behavior for Improving Constitutive Models

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Construction and Validation of the Finite Element Virtual Model of the Beam of Equal Resistance of the Weight Measurement System

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