Abstract
Self-compacting concrete (SCC) is increasingly applied in the construction industries due to its advantages of outstanding workability and eco-friendliness. However, few experimental studies on the mechanical behaviors of SCC under cyclic direct tension are available in the literature. In this work, experimental investigations of mechanical behaviors of SCC under cyclic direct tension were conducted. Especially, direct tensile load equipment was developed. It is found that the envelope stress-strain curve under cyclic direct tension is close to that under monotonic direct tension; however, it is different from that in a compressive case. It is also revealed that the ratio of unloading strain to irreversible strain is approximately linearly dependent on unloading strain. The evolutions of energy dissipation for SCC under both cyclic direct tension and compression are similar to those of normally vibrated concrete. In addition, Poisson’s ratio is observed to be nearly 0.21 for SCC. Furthermore, a damage model enabling characterization of the stress-strain curve under both monotonic and cyclic loading was proposed and verified against experimental results. Therefore, the results in this work provide original research material for studying and modelling the mechanical behaviors of SCC under uniaxial cyclic direct tension.
Highlights
Concrete materials have played an essential role in the development of built environments and civilizations for more than one hundred years
The specimens used for the tests were listed as follows: 14 cube specimens were tested for determining the compressive strength, nine cube specimens were tested for obtaining the stress-strain curves under monotonic compressive loading, 13 prismatic specimens were tested for determining the stress-strain curves under monotonic direct tensile or compressive loading, and 10 prismatic specimens were tested for determining the stress-strain curves under cyclic direct tensile or compressive loading
The envelope of the stress-strain curve for self-compacting concrete (SCC) under cyclic direct tension is close to the stress-strain curve experimental under monotonic direct of tension;,behaviors the envelope under uniaxial cyclic
Summary
Concrete materials have played an essential role in the development of built environments and civilizations for more than one hundred years. During the casting process, SCC is capable of flowing through and filling gaps of reinforcement and corners of molds, compacting with excellent homogeneity and presenting no segregation, by requiring no external vibration [1,2]. This outstanding workability helps SCC to possess higher strength, better durability, and more eco-friendly qualities compared to normally vibrated concrete (NVC) [2]. Brouwers and Radix [3] conducted a series of experimental and statistical studies on the compressive strength and splitting tensile strength of SCC under uniaxial loading
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