Research on the Mechanical Properties of Recycled Aggregate Concrete under Uniaxial Compression Based on the Statistical Damage Model.

Weifeng Bai,Jianyou Wang,Wenhao Li,Chenyang Yuan,Junfeng Guan

doi:10.3390/ma13173765

Abstract

In this paper, uniaxial compression tests were carried out for recycled aggregate concrete with water cement ratios of 0.38, 0.49, and 0.66 and replacement ratios of 0%, 25%, 50%, 75%, and 100%, respectively. The influence of the replacement ratio of recycled aggregate and water cement ratio on the strength, elastic modulus, and deformation characteristics of concrete was discussed. The results show that the replacement rate of recycled aggregate has a significant effect on the macro stress–strain behavior of concrete. In the case of a constant water cement ratio, the peak nominal stress first decreases and then increases with the increase of the replacement rate; while the water cement ratios equal 0.38, 0.49, and 0.66, the corresponding transition states are 25%, 50%, and 50% of the replacement rate, respectively. The deformation and failure is characterized by two stages: distributed damage and local failure. Combined with the statistical damage mechanics, the influence of the aggregate replacement rate on the damage evolution mechanism of recycled concrete on a mesoscopic scale was explored. Two mesoscopic damage modes, fracture and yield, are considered. Their cumulative evolutions are assumed to follow triangular probability distributions, which could be characterized by four parameters. The peak nominal stress state and the critical state are distinguished, and the latter is defined as a precursor to local failure. With the increase of the replacement rate of recycled aggregate, the inhomogeneous evolution of mesoscopic damage shows obvious regular change, which is consistent with the internal chemical and physical mechanism and macro nonlinear stress–strain behavior.

Highlights

In recent years, with the construction of new buildings and demolition of abandoned buildings, a large amount of construction waste has been generated in cities
Five stress–strain curves were obtained for each group
Two curves with the maximum and maximum and minimum peak stress were eliminated first, and the average stress–strain curve of the minimum peak stress were eliminated first, and the average stress–strain curve of the middle three curves middle three curves after average treatment is taken as the representative value of this group of tests

Summary

Introduction

With the construction of new buildings and demolition of abandoned buildings, a large amount of construction waste has been generated in cities. The amount of construction waste is increasing rapidly year by year, which is more obvious in developing countries such as China and. Construction waste in many countries is mainly recycled in the form of roadbed bedding and recycled bricks. These methods waste limited resources, but are generally inefficient. With the further acceleration of urbanization, the consumption of natural resources is increasing, and there is an urgent need for a sustainable construction waste utilization method [2]. The application of recycled aggregate has become a priority project in various countries, and recycled aggregate concrete (RAC) is widely regarded as a new channel for sustainable development

Methods

Results

Conclusion