Concrete deterioration due to sulphate- A case study

Choudhary, Apoorv; Malik, Milind; Tiwari, Sachin; dubey, Ankur; Sharma, Urvashi; Kumar, Ajay

doi:10.1016/j.matpr.2018.06.125

Cited by 3 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sulfate sodium precipitated and dissolved with the water evaporation and saturation during the drying-wetting cycles. When the sulfate precipitated at the specimens' pores and seams, the crystallization pressure would crumble the surrounding cement paste [44]. The specimens were gradually damaged and more cracked cement paste fragments peeled off.…”

Section: Propertiesmentioning

confidence: 99%

Utilization of Coal Gangue Aggregate for Railway Roadbed Construction in Practice

Long

Bai

et al. 2020

Sustainability

View full text Add to dashboard Cite

As a massive solid waste, the high value-added utilization of coal gangue has received more and more attention in China. This study focuses on the utilization of coal gangue aggregate in railway engineering for coal transportation passage. Coal gangue aggregate was employed as high-grade railway subgrade filler andprepared concrete for roadbed drainage (named coal gangue roadbed protecting concrete—CGRPC). First, the basic properties of coal gangue such as particle size distribution, ignition loss, strength change under water softening, and compression performance were measured. Then, the technology to use coal gangue as filler in railway subgrade was put forward based on a real engineering application with the Jingang coal-carrying railway special line. Field tests showed that the coal gangue roadbed had excellent performance. The dynamic stiffness expressed as K30 was more 130 MPa/m, which meets the requirement for high-speed railway roadbeds. The distribution of vertical earth pressure according to the backfill depth showed a linear growing tendency. Finally, the technical and economic benefits of using coal gangue railway roadbeds were analyzed. The application of coal gangue near the railway line not only solved the problem of aggregate shortage in engineering construction, but it also consumes the coal gangue waste and leads to huge social benefits.

show abstract

Section: Propertiesmentioning

confidence: 99%

Utilization of Coal Gangue Aggregate for Railway Roadbed Construction in Practice

Long

Bai

et al. 2020

Sustainability

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

Concrete deterioration due to sulphate- A case study

Cited by 3 publications

References 2 publications

Utilization of Coal Gangue Aggregate for Railway Roadbed Construction in Practice

Utilization of Coal Gangue Aggregate for Railway Roadbed Construction in Practice

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

Contact Info

Product

Resources

About