Numerical investigation of external sulfate attack and its effect on chloride binding and diffusion in concrete

Zhang, Chenglin; Chen, Weikang; Mu, Song; Šavija, Branko; Liu, Qingfeng

doi:10.1016/j.conbuildmat.2021.122806

Cited by 85 publications

(18 citation statements)

References 98 publications

(118 reference statements)

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“…Numerical studies can provide accurate models at multiple scales to reflect the material compositions and meso/micro structures of concrete [45][46][47]. In this study, a 3-D fresh concrete model is established at mesoscopic level, as shown in Fig.…”

Section: Modelling Approachmentioning

confidence: 99%

An experimental and numerical investigation of coarse aggregate settlement in fresh concrete under vibration

Cai¹,

Liu²,

Yu³

et al. 2021

Cement and Concrete Composites

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Section: Modelling Approachmentioning

confidence: 99%

An experimental and numerical investigation of coarse aggregate settlement in fresh concrete under vibration

Cai¹,

Liu²,

Yu³

et al. 2021

Cement and Concrete Composites

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“…Aiming at the severe durability damage and deterioration of reinforced concrete caused by chloride salt erosion and alkali-silicon reaction, Mao proposed a special electrochemical method containing lithium compound anode solution, which would reduce chloride ion corrosion to reinforcement and the influence of alkalisilicon reaction on cracks [15]. Zhang mainly proposed a coupling model and reduction function for the impact of sulfate and chloride on reinforced concrete durability, as well as quantitatively analyzing the impact of sulfate erosion on chloride ion migration from the perspectives of solution concentration, soaking time, curing time, water binder ratio, and aggregate [16]. On the one hand, these findings provide a good reference and enlightenment for the durability design of reinforced concrete in harsh environments [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Zhang mainly proposed a coupling model and reduction function for the impact of sulfate and chloride on reinforced concrete durability, as well as quantitatively analyzing the impact of sulfate erosion on chloride ion migration from the perspectives of solution concentration, soaking time, curing time, water binder ratio, and aggregate [16]. On the one hand, these findings provide a good reference and enlightenment for the durability design of reinforced concrete in harsh environments [12][13][14][15][16]. On the other hand, although the indoor accelerated test has many advantages in simulating concrete deterioration, such as a short test period, convenient testing, and few influencing factors, it still has a particular gap with the concrete degradation process in the actual service environment, and it cannot completely achieve the same degradation as the real service environment.…”

Section: Introductionmentioning

confidence: 99%

Birnbaum‐Saunders Durability Life Prediction Model of Site‐Exposed Concrete in the Saline Soil Area

Wei

Huang

et al. 2021

Advances in Civil Engineering

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Aiming at the prominent problem of short durability life of concrete in saline soil area and the shortcomings of indoor accelerated test, an outdoor field exposure test was designed. The concrete specimens were semiburied in the Tianshui area with salinized soil characteristics, and nondestructive testing was conducted every 180d (days). The durability evaluation parameters and mechanical performance indexes were selected for macroscopic analysis, and the corrosion mechanism was analyzed by using the SEM image and the XRD phase. The Birnbaum-Saunders model based on physical failure and probability statistics was used for life prediction. The results show that there are rod-shaped and chip-shaped crystals growing from the surface of the gel and the internal holes in the exposed end and the embedded end of the concrete. However, the damage and deterioration of the buried end are more serious than those of the exposed end. The corrosion products mainly included ettringite, gypsum, calcium carbonate, sodium sulfate hydrate, carbosilite, and Friedel’s salt. The reliability life curve based on the Birnbaum-Saunders model can describe the whole process of exposed concrete from damage accumulation to failure. In addition, the dynamic modulus degradation index is more sensitive to concrete durability damage, and the life obtained by the Birnbaum-Saunders model is shorter than the quality degradation index. The life obtained by this degradation index is taken as the life of the concrete exposed in the saline soil site, and the concrete life of C30, C40, and C50 is about 3340d, 3930d, and 4360d, respectively.

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“…Sulfate erosion usually occurs in the form of swelling and cracks in concrete [10], when after cracking, carry sulfate solution easier penetration into concrete internal pore [11], sulfate erosion in strength and durability of the concrete after key performance are affected. Under these conditions, sulfate erosion can compromise some mechanical properties of concrete [12,13]. Therefore, for related construction works and marine engineering, the durability of the overall structure will be reduced by sulfate erosion of concrete, resulting in the weakening of concrete and endangering life and property.…”

Section: Introduction 1research Backgroundmentioning

confidence: 99%

An Experimental Study on Mechanical Properties for the Static and Dynamic Compression of Concrete Eroded by Sulfate Solution

Yao

Wei

2021

Materials

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The mechanical properties of the static and dynamic compression of concrete eroded by a 15% sodium sulfate solution were explored with a 70-mm-diameter true triaxial static-dynamic comprehensive loading test system, and an analysis of the weakening mechanisms for the degree of macroscopic damage and microscopic surface changes of eroded concrete were conducted in combination with damage testing based on relevant acoustic characteristics and SEM scanning. The experience obtained in this paper is used to analyze and solve the problem that the bearing capacity of concrete buildings is weakened due to the decrease in durability under the special conditions of sulfate erosion. The results showed that, in a short time, the properties of concrete corroded by sulfate solution were improved to a certain extent due to continuous hydration. When the corrosion time was prolonged, the internal concrete structure was destroyed after it was eroded by sulfate, and its dynamic and static strength, deformability, and energy absorption were reduced to differing degrees, thus greatly inhibiting the overall mechanical performance of concrete; the dynamic compressive strength changed with strain that exhibited a significant strain rate effect; and, under the influence of sulfate erosion and hydration, the longitudinal wave velocity increased first and then decreased. The longitudinal wave velocity was slower than that of concrete under normal environment and distilled water immersion condition. SEM and acoustic wave analysis indicated that the internal concrete structure was destroyed after it was eroded by sulfate, and its dynamic and static strength, deformability, and energy absorption were reduced to differing degrees, thus greatly inhibiting the overall mechanical performance of concrete.

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Numerical investigation of external sulfate attack and its effect on chloride binding and diffusion in concrete

Cited by 85 publications

References 98 publications

An experimental and numerical investigation of coarse aggregate settlement in fresh concrete under vibration

An experimental and numerical investigation of coarse aggregate settlement in fresh concrete under vibration

Birnbaum‐Saunders Durability Life Prediction Model of Site‐Exposed Concrete in the Saline Soil Area

An Experimental Study on Mechanical Properties for the Static and Dynamic Compression of Concrete Eroded by Sulfate Solution

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