Open AccessInvestigation on axial compressive stress-strain relationship of expanded fiber reinforced concrete
Author(s) -
Limin Wang,
Peiwei Gao,
Minghao Tian,
Yilang Tian,
Jianjun Zhong
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/768/3/032026
Subject(s) - materials science , constitutive equation , ductility (earth science) , composite material , fiber , compressive strength , basalt fiber , stress–strain curve , stress (linguistics) , toughness , cylinder stress , fiber reinforced concrete , structural engineering , deformation (meteorology) , finite element method , creep , ultimate tensile strength , engineering , linguistics , philosophy
In order to improve the crack resistance and durability of concrete, basalt fiber and calcium-magnesium expansion agent was used to test the stress-strain relationship and full curve of axial expansion of fiber-expanded concrete with different factors through three-factor three-level orthogonal test. The study of the influence of structural parameters on the constitutive equation of fiber-expanded concrete with different contents and the relationship between the amount of fibers and expansion agents and the parameters of the constitutive equation of the axial compression stress-strain curve were determined. The results have shown that basalt fibers can significantly improve the toughness and ductility of concrete after failure, and the expansion agents can increase the ductility of concrete. When the fiber content is 1%, the expansion agent content is 7%, and the water-binder ratio is 0.42, the mechanical properties are the best. The constitutive parameter β of the rising section of the axial compressive stress-strain curve is 3.1 and the constitutive parameter β of the falling section is 0.6.