Experimental Study on the Effect of Freeze-Thaw Cycles on Axial Tension and Compression Performance of Concrete after Complete Carbonization

Dafu Cao,Yanling Zhou,Xin Zhang,Wenjie Ge,Jiaqi Liu,Adewumi Babafemi

doi:10.1155/2021/8111436

Abstract

The effect of freeze-thaw cycles on the axial tension and axial compression properties of completely carbonized concrete are investigated in this study. Three grade concrete specimens (C30, C40, and C45) were fabricated. The freeze-thaw cycle test was carried out on the completely carbonized specimens, followed by axial tension and axial compression tests. The results show that completed carbonization increases the axial tensile peak stress of C30, C40, and C45 concrete specimens by 8.7%, 9.7%, and, 12.1%, respectively. The peak axial tension strain increased by 1.9%, 7.2%, and 9.6%, respectively. The peak axial compressive stress increased by 10.5%, 19.1%, and 24.1%, respectively. The peak axial compressive strain decreased by 13.7%, 14.1%, and 14.3%, respectively. With the increase of freeze-thaw cycles, the peak stress of tensile stress, peak strain, and compressive stress of concrete decrease continuously. The peak strain of compressive strain increases. The lower the strength grade of concrete, the faster the decline rate of stress and strain. According to the data changes of peak stress and peak strain at different times of freeze thaw after carbonization, the stress-strain curve fitting formula for concrete under freeze-thaw cycles after complete carbonization is put forward, which has a good coincidence with the experimental result.

Highlights

Concrete structures exposed to the atmosphere are subjected to carbonization all year-round
Durability of basalt fiber reactive powder concrete. e result shows that steel fiber reactive powder concrete was more sensitive to the chloride salts when compared with that of the basalt fiber counterpart
Zhao [8] studied freeze-thaw resistance of class F fly ash-based geopolymer concrete. e freeze-thaw resistance was evaluated by mass loss, relative dynamic elasticity modulus, and compressive strength loss

Summary

Introduction

Concrete structures exposed to the atmosphere are subjected to carbonization all year-round. Bai et al [18] studied the complete stress-strain curves and deformation failure characteristics of recycled concrete through uniaxial compression tests of recycled concrete under different freezethaw cycles and revealed the influence of freeze-thaw cycles on the characteristic parameters of statistical damage constitutive model of recycled concrete. An and Jiaru [19] studied the complete stress-strain curve of stirrup confined concrete under different freeze-thaw cycles through axial compressive failure tests. Is paper studies the stress-strain curve equations of concrete under axial tension and axial compression after complete carbonization and freeze-thaw cycles tests, which provides experience for subsequent studies and provides an experimental and theoretical reference for the design of buildings in the cold region

Materials and Methods

C30 C40 C45

Test Results and Discussion