Freeze-Thaw Damage Model of Polypropylene Fiber Reinforced Cement Stabilized Waste Construction Slurry under Uniaxial Action

In order to apply the fiber reinforced cement stabilized waste construction slurry more widely, it is crucial to evaluate its mechanical behavior under freeze and thaw (F-T) cycles. The mechanical properties of fiber cement-modified waste construction slurry (FCMS) under five different F-T cycles were studied using unconfined compressive strength tests. One fixed cement sample with five different types of polypropylene fiber was used in the FCMS. Using the meso random damage model, the two-stage damage stress-strain relationship of FCMS was established using particle swarm optimization (PSO). The results were as follows: (1) The mechanical properties of FCMS at room temperature and in an F-T environment were significantly improved by fiber; (2) The elastic modulus of FCMS decreased in the form of a power function with the increase of F-T cycles; (3) The fitting results of the two-stage F-T damage model based on meso random damage theory were in agreement with the measured data.

Automated summary

The study found that the mechanical properties of FCMS were significantly improved by fibers in different environments. Additionally, the elastic modulus of FCMS decreased in a power function with the increase of F-T cycles, and the fitting results of the two-stage F-T damage model based on meso random damage theory were consistent with the measured data.