Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (4): 1112-1121.doi: 10.13229/j.cnki.jdxbgxb.20210794

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Damage of concrete subjected to sulfate corrosion under dry⁃wet cycles and alternating loads

Bo-wen GUAN1,2(),Wen-jin DI1,2,Fa-ping WANG3,Jia-yu WU1,2,Shuo-wen ZHANG1,2,Zhi-xun JIA3   

  1. 1.School of Materials Science and Engineering，Chang'an University，Xi′an 710061，China
    2.Engineering Research Center of Transportation Pavement Materials，Ministry of Education，Chang'an University，Xi'an 710061，China
    3.Qinghai Transportation Holding Group Co. ，Ltd. ，Xining 810003，China
  • Received:2021-08-18 Online:2023-04-01 Published:2023-04-20

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Abstract:

Aiming at the problem of the damage of concrete in salt-rich areas， the self-developed equipment was used to simulate the environment of concrete subjected to sulfate corrosion under dry-wet cycles and alternating load. Ultrasonic nondestructive testing， pore structure analysis， chemical analysis， and stress-strain testing were used to analyze the macro and micro performance degradation laws of concrete damaged by sulfate erosion. The results showed that： The alternating load has a greater acceleration effect on the sulfate attack of low-strength grade concrete. The alternating load increases the content of harmful pores in the concrete， promotes the transmission of sulfate ions， and accelerates the sulfate corrosion reaction of the concrete. Based on the stress-strain curve of sulfate-eroded concrete under dry-wet cycles and alternating loads， with damage as a variable， a fitting equation for the relative peak stress and strain of sulfate-eroded concrete with the damage degree is proposed.

Key words: road engineering, dry-wet cycles, alternating load, sulfate attack, concrete, stress-strain curve, damage degree

CLC Number: 

  • U414

Table 1

Concrete proportion and performance"

强度

等级

水/（kg·m-3）水泥/（kg·m-3）砂/（kg·m-3）碎石/（kg·m-3）抗压强度/MPa
C50145518506128154.2
C40202505593115043.8
C30193357691115933.6

Fig.1

Test device for sulfate attack of concrete under dry-wet cycle and alternating load"

Fig.2

Schematic diagram and loading spectrum of attack test device"

Fig.3

Relative dynamic elastic modulus of concrete subjected to sulfate attack"

Fig.4

Alternating load coefficient of concrete withdifferent strength grades"

Fig.5

Distribution of sulfate ions in concrete under different attack conditions"

Fig.6

Effect of attack environment on concrete porosity"

Fig.7

Effect of attack environment on concreteproducts"

Fig.8

Concrete crack formation process"

Fig.9

Connectivity of concrete pore structure"

Fig.10

Damage degree of concrete with different strength grade varies with age of attack"

Fig.11

Stress-strain curves of damaged concrete under dry-wet cycle， alternating load and sulfate attack"

Fig.12

Relationship between relative peak stress and damage degree"

Fig.13

Relationship between relative peak strain and damage degree"

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