Study on damage rules on concrete under corrosion of freeze-thaw and saline solution

Chen, Dingshi; Deng, Yuang; Shen, Junjun; Sun, Guorui; Shi, Jun

doi:10.1016/j.conbuildmat.2021.124617

Cited by 36 publications

(9 citation statements)

References 27 publications

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“…Through the analysis of the total charge in tap water and a sodium chloride solution, to evaluate the resistance to chloride ion permeability of concrete, these authors found that the deterioration of concrete, effect of SF, and erosion resistance of concrete were better. Chen et al [13] Through an orthogonal experimental design under the action of freeze-thaw cycling and salt solution erosion, established an ultrasonic wave velocity damage index, the damage constitutive model of concrete, to predict the damage degree, explored the influence of different factors on the damage index, compared the theoretical and experimental values, and demonstrated the feasibility of the model. Tan and Yu [14] measured the weight loss rate and relative dynamic elastic modulus (RDEM) of air-entrained concrete (AEC) under the coupling effect of freezing-thawing cycles and salt lake brine in different regions, analysed the concrete damage process by mass loss and SEM, and found that freezing-thawing cycles and salt lake brine caused relatively little damage to Qinghai and Xinjiang.…”

Section: Introductionmentioning

confidence: 99%

Degradation mechanism and life prediction of tailings and waste rock aggregate geopolymer concrete under freeze-thaw corrosion

Sun

Wang

et al. 2022

Mater. Res. Express

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To study the durability of tailings and waste rock aggregate geopolymer concrete (TWGPC), a large number of tailings and waste rock were used to replace natural sand and stone as aggregates, and a fly ash geopolymer was used to replace cement as cementing material to prepare TWGPC. The slow freezing method was used to carry out single freeze-thaw and freeze-thaw corrosion tests. Scanning electron microscopy and energy dispersive spectroscopy (SEM–EDS) were used to analyse the microstructure and reaction products of TWGPC. The degradation mechanism of TWGPC was studied, and the life of TWGPC was predicted. The results show that the higher the concentration of corrosion solution was, the more significant the change trend of the mechanical properties test results. In the early stage of the cycle, acinar gypsum and short columnar ettringite were generated to fill the pores and improve the compactness and frost resistance of TWGPC. In the late stage of the cycle: calcium-silicate-hydrate (C-S-H) was decomposed and gradually replaced by magnesium-silicate-hydrate (M-S-H). The cohesion between mortar and aggregate was reduced, and a large number of products were generated. Cl- inhibited the transmission rate of SO42- and reduced the erosion effect of SO42- on TWGPC. The single freezing-thawing life prediction model had high accuracy, and the life prediction conclusion based on reliability was consistent with the appearance damage analysis, mechanical property testing and microscopic morphology analysis.

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Section: Introductionmentioning

confidence: 99%

Degradation mechanism and life prediction of tailings and waste rock aggregate geopolymer concrete under freeze-thaw corrosion

Sun

Wang

et al. 2022

Mater. Res. Express

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“…Many researchers have investigated the durability of concrete under a combined effect of chemical attack and freeze–thaw cycling, achieving significant research outcomes. There is an interaction between freeze–thaw cycling and sulphate erosion [ 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. The addition of fly ash (FA), silica fume (SF) [ 9 , 10 ] and recycled brick–concrete aggregates [ 11 ] can effectively improve the resistance of concrete to combined freeze–thaw and sulphate erosion.…”

Section: Introductionmentioning

confidence: 99%

Influence of Drying Conditions on the Durability of Concrete Subjected to the Combined Action of Chemical Attack and Freeze–Thaw Cycles

Song,

Yu,

2024

Materials

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The durability of concrete is critical for the service life of concrete structures, and it is influenced by various factors. This paper investigates the impact of the relative humidity (RH) of the curing environment on the durability of five different concrete types. The aim is to determine a suitable approach for designing concrete that is well-suited for use in the salt lake region of Inner Mongolia. The concrete types comprise ordinary Portland cement (OPC), high-strength expansive concrete (HSEC), high-strength expansive concrete incorporating silica fume, fly ash, and blast furnace slag (HSEC-SFB), steel fiber-reinforced high-strength expansive concrete (SFRHSEC), and high elastic modulus polyethylene fiber-reinforced high-strength expansive concrete (HFRHSEC). All these concrete types underwent a 180-day curing process at three distinct relative humidities (RH = 30%, 50%, and 95%) before being subjected to freeze–thaw cycles in the Inner Mongolia salt lake brine. The curing environment with a 95% RH is referred to as the standard condition. The experimental results reveal that the durability of OPC and HSEC decreases significantly with increasing relative humidity. In comparison with the control sample cured in 95% RH, the maximum freeze–thaw cycles for concrete cured in lower RHs are only 31% to 76% for OPC and 66% to 77% for HSEC. However, the sensitivity of the durability of HSEC-SFB, SFRHSEC, and HFRHSEC to variations in RH in the curing environment diminishes. In comparison with the corresponding reference value, the maximum freeze–thaw cycles for samples cured in dry conditions increase by 14% to 17% for HSEC-SFB and 21% for SFRHSEC. Specifically, the service life of HFRHSEC cured in a low RH is 25% to 46% higher than the reference value. The durability of HSEC-SFB, SFRHSEC, and HFRHSEC has been proven to be appropriate for structures located in the salt lake region of Inner Mongolia.

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“…The issues of the influence of low negative and alternating temperatures on the strength and deformation properties of concrete are considered by numerous authors [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The increase in frost resistance of reinforced concrete structures is ensured primarily by the use of frost-resistant concretes.…”

Section: Introductionmentioning

confidence: 99%

Effect of reinforcement on the durability of bent reinforced concrete structures under conditions of alternating freezing and thawing

Попов

2023

E3S Web Conf.

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The article studies the influence of the level and type of reinforcement of bending elements of reinforced concrete structures on their bearing capacity under the influence of alternating freezing and thawing. Strength and deformation characteristics for B30 concrete class were taken according to Construction Rules SP 63.13330.2018, and after exposure to alternating freezing and thawing according to Construction Rules SP 52.105.2009. The study of the stress-strain state and the assessment of the bearing capacity were carried out according to a specially developed program, in which the diagrammatic method was implemented. It is shown that the durability of bent reinforced concrete structures depends on the percentage and type of reinforcement. When reinforcing with longitudinal tensile reinforcement equal to 1%, the decrease in the bearing capacity of a reinforced concrete beam after exposure to alternating freezing and thawing will make up 5.5%, and in case of 2.5% reinforcement it will equal to 20.9%. In addition, the nature of fracture will change and the stress in the tensile reinforcement will not reach the design resistance. If it is impossible to limit the percentage of reinforcement of longitudinal tensile reinforcement, it is recommended to use double reinforcement. Installation of working reinforcement in a compressed zone in a volume of 50% of the stretched one with a reinforcement percentage of 2% will reduce the decrease in bearing capacity to 2.2% after exposure to freezing and thawing cycles and not change the nature of destruction.

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Study on damage rules on concrete under corrosion of freeze-thaw and saline solution

Cited by 36 publications

References 27 publications

Degradation mechanism and life prediction of tailings and waste rock aggregate geopolymer concrete under freeze-thaw corrosion

Degradation mechanism and life prediction of tailings and waste rock aggregate geopolymer concrete under freeze-thaw corrosion

Influence of Drying Conditions on the Durability of Concrete Subjected to the Combined Action of Chemical Attack and Freeze–Thaw Cycles

Effect of reinforcement on the durability of bent reinforced concrete structures under conditions of alternating freezing and thawing

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