Mechanical Properties and Damage Evolution of Concrete Materials Considering Sulfate Attack

Wu, Qianyun; Ma, Qinghai; Huang, Xiaoxian

doi:10.3390/ma14092343

Cited by 23 publications

(15 citation statements)

References 21 publications

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“…The damage variable is defined ascompressive strength. Based on phenomenological method theory, the damage variable under different dry-wet cycles and different concentrations of sulfate solution was calculated using Equation (3) [41][42][43][44]:…”

Section: Damage Variables Of Hdcmentioning

confidence: 99%

Experimental Study on Mechanical Properties of High-Ductility Concrete against Combined Sulfate Attack and Dry–Wet Cycles

Shi

Kou

2021

Materials

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Concrete will deteriorate and damage under sulfate attack.In order to study the degradation characteristics of HDC under sulfate attack, the mechanical properties of high-ductility concrete (HDC) were investigated using the uniaxial compressive strength test of HDC specimens soaked in different concentrations of sulfate solution and subjected to different times of dry–wet cycles. The variations in the compressive strength, loss rate of compressive strength, and the max compressive strength under the action of sulfate attack and dry–wet cycles were analyzed. The analytical expressions of damage variables were given. SEM was used to observe the microstructure of the sample, and the microdamage mechanism of the HDC was explored. The deterioration of the HDC was found to be the result of the combined action of sulfate attack and dry–wet cycles and was caused by physical attack and chemical attack. PVA prevented the rapid development of deterioration. On the basis of the change of compressive strength, the damage variable was established to quantitatively describe the degree of damage to HDC. The experimental results showed that with the increase in the number of dry–wet cycles, the compressive strength of HDC generally increased first and then decreased. As the concentration of the sulfate solution increased, the loss rate of the compressive strength of HDC generally increased and the max compressive strength gradually decreased. With the increase inthe number of dry–wet cycles, HDC first showed self-compacting characteristics and then gradually became destroyed. Compared with ordinary concrete (OC), HDC is superior to OC in sulfate resistance and dry–wet cycles. This study provided a test basis for the engineering application of HDC in sulfate attack and dry–wet cycles environment.

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Section: Damage Variables Of Hdcmentioning

confidence: 99%

Experimental Study on Mechanical Properties of High-Ductility Concrete against Combined Sulfate Attack and Dry–Wet Cycles

Shi

Kou

2021

Materials

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“…The most common minerals produced inside sulfate-eroded tunnel concrete are gypsum and ettringite [ 6 ]. The evolution of tunnel concrete sulfate damage is often affected by the sulfate concentration [ 7 , 8 ], temperature [ 9 , 10 , 11 ], humidity [ 12 ], concrete cement composition [ 13 , 14 , 15 ] and fly ash content [ 16 , 17 ] in the tunnel. Due to the complex damage mechanism of concrete under sulfate erosion and numerous influencing factors, many scholars explored the damage failure mechanism of sulfate erosion through various experimental methods to establish a research method for predicting damage failure of concrete under sulfate erosion.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the ultrasonic pulse has become the focus of attention of many researchers. Previous studies have also established the relationship between UPV and durability indicators such as concrete permeability, porosity, water absorption and fly ash content [ 17 , 33 , 34 , 35 ]. However, there is very little literature about the use of ultrasonic nondestructive testing to directly detect the damage degree of concrete in a service tunnel.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Prediction of Sulfate Erosion Damage of Concrete in Service Tunnel Based on ARIMA Model

et al. 2021

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Sulfate erosion is a major cause of concrete durability deteriorations, especially for the service tunnels that suffer sulfate erosion for a long time. Accurately predicting the concrete damage failure under sulfate erosion has been a challenging problem in the evaluation and maintenance of concrete structures. Here we design the dry–wet cycle test of service tunnel concrete under sulfate erosion and analyze the Elastic relative dynamic modulus (Erd) and mass under 35 times cycle periods. Then we develop an autoregressive integrated moving average (ARIMA) prediction model linking damage failure to Erd and mass. The results show that the deterioration of concrete first increased and then decreased with an extension of the dry–wet cycle period. Moreover, based on a finite set of training data, the proposed prediction approach shows high accuracy for the changes of concrete damage failure parameters in or out of the training dataset. The ARIMA method is proven to be feasible and efficient for predicting the concrete damage failure of service tunnels under sulfate erosion for a long time.

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“…Under the action of an external load, the microcracks in concrete will expand and converge, finally forming macrocracks. Macrocracks will cause strength, stiffness and other performance degradations, and even material damage [ 19 , 20 ], namely, material damage. The macroscopic cracks will cause new damage and then accumulate to cause the cracks to expand.…”

Section: Introductionmentioning

confidence: 99%

Research on Cracking Mechanism of Early-Age Restrained Concrete under High-Temperature and Low-Humidity Environment

Yuan

Shen

et al. 2021

Materials

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How to prevent the cracking of tunnel lining concrete under a high-temperature and low-humidity environment has gradually become a challenge faced by the engineering community. Actually, the concrete structure will be restrained, which easily leads to cracking. Aiming at this problem, a self-restraint device of concrete specimens was designed in this paper, which aims to more realistically simulate the restrained state of concrete structures during construction. SEM, EDS and XRD detection methods were used to study the macroscopic and microscopic properties of an early-age restrained concrete specimen under a high-temperature and low-humidity environment, and the results were compared with those of a non-restrained concrete specimen. The results show that the change in the internal relative humidity of the concrete was an extremely slow process, and the response rate of the internal humidity of the concrete was much slower than that of the temperature. A cubic curve model was used to fit the measured concrete damage degree with the loading age, and the fitting effect was good. Under the environment of high temperature and low humidity, the loading age from the 0.6th day to the 1st day was the period of a relatively large fluctuation in the concrete temperature and humidity, and the restraint would aggravate the damage of the concrete. The damage degree increased with the increase in the loading age, the microcracks gradually increased and, finally, macrocracks were formed. The restraint effect was to intensify the formation of microcracks, affect the hydration of the cement at the micro level and, finally, increase the risk of concrete cracking perpendicular to the restrained direction at the macro level. The research results may provide guidance for research on the cracking mechanism of tunnel lining concrete constructed under a high-temperature and low-humidity environment.

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Mechanical Properties and Damage Evolution of Concrete Materials Considering Sulfate Attack

Cited by 23 publications

References 21 publications

Experimental Study on Mechanical Properties of High-Ductility Concrete against Combined Sulfate Attack and Dry–Wet Cycles

Experimental Study on Mechanical Properties of High-Ductility Concrete against Combined Sulfate Attack and Dry–Wet Cycles

Analysis and Prediction of Sulfate Erosion Damage of Concrete in Service Tunnel Based on ARIMA Model

Research on Cracking Mechanism of Early-Age Restrained Concrete under High-Temperature and Low-Humidity Environment

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