UNIAXIAL COMPRESSIVE STRESS-STRAIN BEHAVIOR OF SELF- COMPACTING CONCRETE WITH HIGH-VOLUME FLY ASH
Keywords:
Stefanus A Kristiawan, Agus Setiya Budi, Andreas Nur HadiAbstract
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.