Effect of sulfate solution concentration on the deterioration mechanism and physical properties of concrete

Liu, Peng; Chen, Ying; Yu, Zhiwu; Lu, Zhao–Hui

doi:10.1016/j.conbuildmat.2019.08.022

Cited by 58 publications

(16 citation statements)

References 22 publications

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“…In addition, the change of the strength corrosion resistant coefficient of concrete becomes more significant with erosion age. e above results accord well with that of References [38,43]. Both the strength corrosion resistant coefficient of C20 and C30 is less than one with the erosion age of 2 months and the concentration of sulfate solution larger than 5%.…”

Section: Axial Compressive Strength and Strength Corrosionsupporting

confidence: 91%

“…However, the ultimate bearing capacity of C40 attacked by sulfate solution still increases. Sulfate attack has double effects, that is, positive or negative effect, on the macroperformances, composition, and microstructure of concrete, as reported of References [3,37,38]. e higher the concentration of sulfate solution, the larger is the concentration gradient of the concrete surface.…”

Section: Effects Of Concentration Of Sulfate Solution and Erosionmentioning

confidence: 89%

“…Moreover, the slope of linear elasticity of strains' curve of C20 first decreases and then increases with the increase in concentration of sulfate solution. e reasons may be due to that more expansive substances and sulfate salt crystals are generated under the high concentration of sulfate solution, so the crystallization pressure and internal stress in concrete induce the damage of microstructure [38]. e slopes of linear elasticity of strains' curve of C30 and C40 decrease with the increase in concentration of sulfate solution, which implies that the elasticity modulus of the concrete surface attacked by sulfate increases.…”

Section: Partial Immersion Formmentioning

confidence: 99%

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Damage Constitutive Model and Mechanical Performance Deterioration of Concrete under Sulfate Environment

Liu

Chen

et al. 2020

Mathematical Problems in Engineering

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The effects of erosion mode, erosion age, and concentration of sulfate solution on mechanical properties of concrete were investigated. The dimensionless relationship model of the stress-strain of concrete on the basis of randomness was proposed. The variation of the elasticity modulus and Poisson’s ratio of the concrete surface attacked by sulfate was studied, and a novel method of using a superficial parameter to characterize the performance change of the concrete surface was recommended. The results showed that the dimensionless relationship model of stress-strain of concrete could be used to represent the variations of mechanical properties of concrete. The differences of load-displacement of concrete before and after sulfate attack were reflected as the change of curve’s slope and ultimate bearing capacity, and the slope of a straight section of the lateral and longitudinal strain curves of concrete surface also varied. The increment rates of ultimate bearing capacity of concrete attacked by 1% and saturated sulfate solution were about 30% and 10%, respectively. However, the decreasing ratio of the ultimate bearing capacity of concrete attacked by saturated sulfate solution was approximately 25%. The damage factor of the elasticity modulus of the concrete surface of C20 and C40 was 0.185 and −0.19, respectively. The obtained results could provide a support for investigating the variations of stress-strain relationship and mechanical performance of concrete under a sulfate environment.

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Section: Axial Compressive Strength and Strength Corrosionsupporting

confidence: 91%

Section: Effects Of Concentration Of Sulfate Solution and Erosionmentioning

confidence: 89%

Section: Partial Immersion Formmentioning

confidence: 99%

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Damage Constitutive Model and Mechanical Performance Deterioration of Concrete under Sulfate Environment

Liu

Chen

et al. 2020

Mathematical Problems in Engineering

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“…In these situations, sulfate ions will affect the early age properties of shotcrete. The degradation of concrete due to sulfate ions being present in the aggregates has been widely studied in recent years [7,8]. The presence of sulfate in water or aggregates can cause the corrosion of concrete.…”

Section: Introductionmentioning

confidence: 99%

The Mechanical Properties of Early Aged Shotcrete under Internal Sulfate Attack

Jin

Hou

et al. 2021

Materials

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Shotcrete is the primary material for tunnel support due to its early rapid hardening characteristics. During tunnel construction in a sulfate environment, the hardening law of concrete will be affected. In this study, samples were prepared at six different curing times and immersed in four different concentrations of sulfate solutions. A uniaxial test was conducted and analyzed to investigate the effect of sulfate attack on the mechanical properties of early aged shotcrete materials. Results indicated that waterlogged shotcrete does not have apparent cracks on the outside. The stress–strain curve or ultimate compressive strength of the samples showed that the effect of sulfate on shotcrete should be differentiated into chemical and physical sulfate attacks, according to the concentration of sulfate ions. The two parameters in the equation of the hardening behaviors of sulfate attack samples, ultimate compressive strength, and time constant, are related to sulfate concentration. The crack damage stress threshold of samples demonstrates that high-concentration sulfate corrosion leads to an impact on the durability of shotcrete.

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“…Therefore, it is of great significance to carry out research on the deterioration of concrete under the coupling of sulfate erosion and the dry–wet cycle. Many researchers have made a lot of achievements in the study of sulfate-eroded concrete [ 10 , 11 , 12 , 13 , 14 ]. But due to the differences in the simulated experimental environment [ 15 , 16 , 17 , 18 ], the selected test method [ 19 , 20 , 21 ], and the concrete mix ratio used in the test [ 22 , 23 ], etc., up to now, there is no unified test system.…”

Section: Introductionmentioning

confidence: 99%

Study on the Deterioration of Concrete under Dry–Wet Cycle and Sulfate Attack

et al. 2020

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In order to study the deterioration and mechanism of dry–wet cycles and sulfate attack on the performance of concrete in seaside and saline areas, the deterioration of compressive strength of concrete with different water cement ratios under different erosion environments (sodium sulfate soaking at room temperature and coupling of dry–wet cycling and sodium sulfate) was studied here. At the same time, ICT (industrial computed tomography) and NMR (nuclear magnetic resonance) techniques were used to analyze the internal pore structure of concrete under different erosion environments. The results show that the compressive strength under different erosion environments increases first and then decreases, and the dry–wet cycle accelerates the sulfate erosion. With the increase of dry and wet cycles, larger pores are filled with erosion products and developed into small pores in the early stage of erosion; in the later stage of erosion, the proportion of larger pores increases, and cracks occur inside the sample. In the process of sulfate soaking and erosion, the smaller pores in the concrete account for the majority. As the sulfate erosion continues, the T2 spectrum distribution curve gradually moves right, and the signal intensity of the larger pores increases.

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Effect of sulfate solution concentration on the deterioration mechanism and physical properties of concrete

Cited by 58 publications

References 22 publications

Damage Constitutive Model and Mechanical Performance Deterioration of Concrete under Sulfate Environment

Damage Constitutive Model and Mechanical Performance Deterioration of Concrete under Sulfate Environment

The Mechanical Properties of Early Aged Shotcrete under Internal Sulfate Attack

Study on the Deterioration of Concrete under Dry–Wet Cycle and Sulfate Attack

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