Technical gazette, Vol. 27 No. 6, 2020.
Original scientific paper
https://doi.org/10.17559/TV-20190428142148
Study on the Mechanical Properties and Damage Constitutive Model of Hybrid Fibre- Reinforced EPS Lightweight Aggregate Concrete
Huang Wei
; Civil Engineering School, Xi'an University of Architecture and Technology, No.13 Yanta Road, Beilin District, Xi'an 710055, China
Miao Xin-Wei*
; College of Science, Xi'an University of Architecture and Technology, No.13 Yanta Road, Beilin District, Xi'an 710055, China
Sun Yu-Jiao
; Civil Engineering School, Xi'an University of Architecture and Technology, No.13 Yanta Road, Beilin District, Xi'an 710055, China
Reng Shanshan
; Civil Engineering School, Xi'an University of Architecture and Technology, No.13 Yanta Road, Beilin District, Xi'an 710055, China
Abstract
The 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.
Keywords
damage constitutive model; EPS lightweight aggregate concrete; hybrid fibre; polypropylene fibre; wood fibre
Hrčak ID:
248217
URI
Publication date:
19.12.2020.
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