Degradation mechanisms of cast-in-situ concrete subjected to internal-external combined sulfate attack

Zhao, Guo; Li, Fulin; Shi, Mei; Fan, Honggang; Cui, Jifei; Xie, Feng

doi:10.1016/j.conbuildmat.2020.118683

Cited by 55 publications

(22 citation statements)

References 32 publications

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“…2b, d, f and h). In these images, you can see the areas where the heat is most accumulated and emitted to a greater extent (warmer areas); these correspond to the areas where the asphalt layer has been completely removed due to degradation, which can be caused by different factors: atmospheric conditions [55,56]; chemical and physical attacks [57,58]; friction due to the movement of cars [59]. Related to the physical deterioration, the effects of temperature on the structural quality of the concrete slabs (micro-cracking and micro-cracking) were also observed [60,61], because the cyclic variation of the temperature causes granulometric disintegration of the concrete [62].…”

Section: Mechanical Characterization Of the Samplesmentioning

confidence: 99%

Case study on the mineralogical and petrophysical analysis of reinforced concrete slabs of a highway viaduct of the S.G.C. Orte-Ravenna

et al. 2021

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For the maintenance of the safety and security of people traveling on the road, renovation of the reinforced concrete is necessary, especially for bridge or viaduct slabs. Being able to quantify the degradation of slabs and propose methodologies for its retrofit or maintenance is crucial not only in the mineralogical-engineering field but also for socio-economic implications. In this study, samples of deck slabs of a viaduct from the highway E45 near the locality of Bagno di Romagna (Emilia Romagna, north of Italy) were subjected to a testing program to evaluate mechanical and mineralogical parameters through thermographic analyses, compression, and Ultrasonic Pulse Velocity tests and morphological observation. The analyses allow to better recognize the damage of the reinforced concrete samples and they have shown that the cause of the detachment of the asphalt has mainly a natural origin, due to temperature variations and precipitation, with a secondary cause in the anthropogenic impact. The work aims to understand the relationships between the structure of the aggregates and the characteristics of concrete to understand the development of degradation. This knowledge could be used to prevent future damages to the highways. Article Highlights• Concrete slabs analysed provided information about the relation between damage level, mechanical behaviour, size and distribution of aggregates.• Thermographic analyses were useful to understand how deep the damage was in the slabs and to detect any detachment of the asphalt. • Compressive tests, through the failure load value, shown that the ultimate strength level decreased due to formation of microcracks.

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Section: Mechanical Characterization Of the Samplesmentioning

confidence: 99%

Case study on the mineralogical and petrophysical analysis of reinforced concrete slabs of a highway viaduct of the S.G.C. Orte-Ravenna

et al. 2021

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“…It is well-known that seawater contains a large number of ions that are harmful to concrete, among which sulfate corrosion is one of the most important mechanisms for degradation of concrete’s durability in marine environments [ 1 , 2 , 3 ]. Expansive stress could be generated due to the chemical reactions between diffused sulfate ions and the pore solution in concrete structures.…”

Section: Introductionmentioning

confidence: 99%

A Statistical Evolution Model of Concrete Damage Induced by Seawater Corrosion

Chen

2021

Materials

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The transmission of sulfate ions in concrete results in formation of calcium sulfoaluminate crystals due to chemical reactions. The expansion of calcium sulfoaluminate crystals is the main cause of concrete corrosion damage. In this study, ultrasonic analysis was used to detect the modulus change of concrete due to sulfate corrosion to obtain the basic law of corrosion damage evolution. An exponential growth model was developed for the internal expansion force based on the chemical reaction rate of calcium sulfoaluminate crystallization. Then, the evolution equation of the number density of microcracks was derived based on their initiation and balance conditions. Finally, a statistical model was developed for the concrete damage evolution by integrating the volume of microcracks. It is shown that the statistical evolution model can well characterize the evolution of concrete corrosion damage.

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“…Among many factors threatening the durability of underground concrete structures in coastal areas and saline soil areas, salt attack is especially prominent. In particular, the sulfate attack of concrete involves physical, chemical, mechanical, and other processes and is very harmful [17][18][19][20][21][22], with complex influencing factors [23][24][25][26][27]. Sulfate attack can cause expansion and cracking of concrete, because of which the erosive medium can easily penetrate into the matrix and accelerate the deterioration process, leading to the loss of cohesion of cement hydration products and the decline of the overall resistance level of the concrete structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Strength and Deformation Characteristics of Concrete under True Triaxial Compression after Sulfate Attack

Wei

Bai

et al. 2021

Advances in Civil Engineering

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To explore the mechanical properties of concrete under true triaxial static compressive load after sulfate attack, uniaxial static compression test and true triaxial static compression test at four stress ratios were carried out on concrete specimens immersed in 15% sulfate solution for 0–120 days by the integrated true triaxial static and dynamic load testing system, and the variation of performance indicators such as the strength and deformation of concrete under the coupling action of sulfate attack and complex stress state was analyzed. The results show that the uniaxial compressive strength of concrete increases at the beginning and then decreases with the increase of sulfate attack time and reaches the peak on the 30th day, with an increase rate of 16.57%; the strength of concrete under triaxial compression increases significantly, and the maximum triaxial compressive strength is 3.18 times of uniaxial compressive strength under the combination of 0-day sulfate attack and 0.2 : 0.8 stress ratio; and the deterioration of concrete under sulfate attack is more prominent at high confining pressure, and as the sulfate attack worsens, the sensitivity of triaxial compressive strength of concrete to lateral compressive stress is reduced. In conclusion, triaxial compression can significantly enhance the ductility of concrete by playing a role in restraining the deformation and cracking of concrete after sulfate attack.

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Degradation mechanisms of cast-in-situ concrete subjected to internal-external combined sulfate attack

Cited by 55 publications

References 32 publications

Case study on the mineralogical and petrophysical analysis of reinforced concrete slabs of a highway viaduct of the S.G.C. Orte-Ravenna

Case study on the mineralogical and petrophysical analysis of reinforced concrete slabs of a highway viaduct of the S.G.C. Orte-Ravenna

A Statistical Evolution Model of Concrete Damage Induced by Seawater Corrosion

Experimental Study on the Strength and Deformation Characteristics of Concrete under True Triaxial Compression after Sulfate Attack

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