Failure Mechanism Analysis of Polypropylene Fiber Recycled Concrete Strength Evolution with Age in Natural Forest Covered Quarry

Abstract

Forest evaporation and turbulent exchange intensity affect the characteristics of soil and stone.
The accelerated demolition and construction speed of various projects leads to the accumulation
of waste concrete. It is imperative to dispose and utilize waste concrete reasonably. Based on
the research results of physical and mechanical properties of artificial sand, this paper combines
100% recycled coarse aggregate with 100% artificial sand. After adding polypropylene fiber to
form a new type of fiber-reinforced artificial sand recycled concrete, the mechanical properties
of the concrete were studied. In the experiment, 45 standard cube test blocks and 90 standard
prism test blocks were designed and made with three concrete strength grades (C25, C35 and
C45) corresponding to 5 polypropylene fiber contents (0%, 0.6%, 0.9%, 1.2% and 1.5%).
Through cube and prism compressive strength test and elastic modulus test, the influence of
different water cement ratio and different fiber content on the basic mechanical properties of
concrete is studied. The experimental results reveal the binary relationship between the cube
compressive strength and prism compressive strength of recycled concrete with fiber artificial
sand affected by fiber content and water cement ratio. In this paper, the conversion relationship
between compressive strength and axial compressive strength is analyzed, and the stress-strain
constitutive relationship of fiber reinforced artificial sand recycled concrete prism under
uniaxial compression is studied.