Study on the Mechanical Properties and Damage Constitutive Model of Hybrid Fibre-Reinforced EPS Lightweight Aggregate Concrete
2020; Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering i; Volume: 27; Issue: 6 Linguagem: Inglês
10.17559/tv-20190428142148
ISSN1848-6339
AutoresWei Huang, Xinwei Miao, Sun Yu-Jiao, Reng Shanshan,
Tópico(s)Structural Behavior of Reinforced Concrete
ResumoThe mechanical properties of hybrid fibre (polypropylene and wood)-reinforced expanded polystyrene (EPS) lightweight aggregate concrete was studied under various sand contents.Cubic and prismatic compression tests were carried out, through which the basic mechanical properties and stress-strain curves of the specimens were obtained.Moreover, the microstructures of the fibre-reinforced concrete with different sand proportions were analysed via scanning electron microscopy (SEM).The test results showed that as the sand proportion increased, the cubic compressive strength and prismatic compressive strength of the EPS lightweight aggregate concrete increased.The optimal slump was obtained when the sand ratio was 25%, after which the slump declined.The EPS lightweight aggregate concrete exhibited obvious elastoplastic behaviour during compression, and the corresponding stress-strain curve could be divided into four stages: the elastic stage, strengthening stage, softening stage and collapse platform stage.Moreover, based on the test results and the damage theory and considering the coupling relationship between plasticity and damage, a damage constitutive model was proposed for hybrid fibre-reinforced EPS lightweight aggregate concrete under uniaxial compression.
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