Long-term properties and microstructure change of engineered cementitious composites subjected to high sulfate coal mine water in drying-wetting cycles

Wang, Zhenbo; Sun, Peng; Zuo, Jianping; Liu, Chang; Han, Yongdian; Zhang, Zishan

doi:10.1016/j.matdes.2021.109610

Cited by 23 publications

(9 citation statements)

References 40 publications

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“…It is also observed from Figure 10 c that the intensity of the gypsum peak was highest in CGC30S15-120 d among four specimens with different sulfate concentrations of the solution, indicating that gypsum, rather than ettringite, became the dominant corrosive product in a high concentration of Na 2 SO 4 solution, due to the rapid consumption of aluminate during the long corrosive process. The volume of gypsum expanded to 2.2 times the original, which led to the generation of new cracks and severe deterioration in CGC exposed to a higher concentration of sulfate solution [ 10 ].…”

Section: Micro-mechanism Of Sulfate-attacked Cgcmentioning

confidence: 99%

“…However, the in situ environment, especially the mine water, includes various chemical compositions, particularly a high content of SO 4 2− (even 1500–2000 mg/L), which may cause deterioration of cementitious materials and concrete structures in underground mining areas [ 10 , 11 , 12 , 13 ]. Wang, et al [ 10 ] elucidated the compressive properties’ evolution of engineered cementitious composites under the attack of high sulfate coal mine water, and the strength was reduced at the later corrosion stage. Moreover, it is claimed that sulfate attack has a great impact on the pre- and post-failure behavior of cemented paste backfill in underground mines [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Degradation Mechanism of Coal Gangue Concrete Suffering from Sulfate Attack in the Mine Environment

Xia

et al. 2023

Materials

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Recycling coal gangue as aggregate to produce concrete in situ is the most effective way to solve the problem of deposited coal gangue in mines. Nevertheless, the mine environment underground is rich in sulfate ions, posing a threat to the durability of coal gangue concrete (CGC). Hence, the degradation process of sulfate-attacked CGC is investigated. A series of tests is performed to evaluate its variation law of mass, dynamic elastic modulus, compressive strength and sulfate ion distribution. Meanwhile, the microstructure and phases of sulfate-attacked CGC are identified by scanning electron microscopy, X-ray diffraction and thermogravimetric analysis. The results indicate that the residual compressive strength ratio of CGC is higher than that of normal concrete after a 240 d sulfate attack, implying a superior sulfate resistance for CGC. Additionally, the higher the sulfate concentration, the more severe the degradation. Except for the secondary hydration of CGC itself, the diffused sulfate ions also react with Ca(OH)2, forming gypsum and ettringite; this plays a positive role in filling the pores at the early stage, whereas, at the later stage, the generated micro-cracks are detrimental to the performance of CGC. In particular, the proposed sulfate corrosion model elucidates the degradation mechanism of CGC exposed to a sulfate-rich environment.

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Section: Micro-mechanism Of Sulfate-attacked Cgcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Degradation Mechanism of Coal Gangue Concrete Suffering from Sulfate Attack in the Mine Environment

Xia

et al. 2023

Materials

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“…Due to outstanding deformation capacity, utilizing ECC in structural members can prevent catastrophic collapse, for example during earthquakes, enabling lives savings and reducing repair costs [3,4]. Additionally, the maximum crack width in ECC can be limited to less than 0.1 mm until its ultimate strain, revealing a potential to enhance the durability of reinforced concrete structures under severe environmental conditions [5][6][7][8]. ECC has already been widely applied for various field constructions including buildings, transportation, water and other infrastructures [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Shear transfer mechanism in reinforced engineered cementitious composite (ECC) beams: Quantification ofVsandVc

Pan

Mustafa

et al. 2022

Engineering Structures

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“…Coal mining activities produce mine water, which contains a lot of inorganic salts and metal ions. The direct discharge of this mine water would lead to land salinization and destruction of the ecological environment. , The treatment of mine water would greatly increase the cost of coal mining. − Therefore, if the mine water could be reused, it could reduce not only the cost of coal mining but also the water pollution. , In view of the above problems, this paper put forward a method of mine water reuse. This method used high sulfate mine water to dissolve chlorine inhibitors to save water resources.…”

Section: Introductionmentioning

confidence: 99%

“…The direct discharge of this mine water would lead to land salinization and destruction of the ecological environment. 1 , 2 The treatment of mine water would greatly increase the cost of coal mining. 3 − 5 Therefore, if the mine water could be reused, it could reduce not only the cost of coal mining but also the water pollution.…”

Section: Introductionmentioning

confidence: 99%

Influence of High Sulfate Mine Water on Spontaneous Combustion of Coal

et al. 2022

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Mine water cannot be discharged until it has been treated, which increases the cost of mining and causes environmental damage. This paper attempted to use sulfate mine water as a flame retardant material for the treatment of coal spontaneous combustion (CSC) in underground mines. The temperature-programed experimental device and gas chromatograph were used to simulate the low-temperature oxidation process of coal. Infrared spectroscopy was used to study the influence and inhibition mechanism of mine water and chloride inhibitor on active functional groups. It was found that although the sulfate mine water inhibited the formation of −OH, it accelerated the cleavage of the aromatic ring. The thermogravimetric experiment was used to analyze the ignition temperature and activation energy of different coal samples. It was found that mine water had an obvious effect on inhibiting CSC in the combustion stage, which could increase the oxidation temperature of coal.

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Long-term properties and microstructure change of engineered cementitious composites subjected to high sulfate coal mine water in drying-wetting cycles

Cited by 23 publications

References 40 publications

Degradation Mechanism of Coal Gangue Concrete Suffering from Sulfate Attack in the Mine Environment

Degradation Mechanism of Coal Gangue Concrete Suffering from Sulfate Attack in the Mine Environment

Shear transfer mechanism in reinforced engineered cementitious composite (ECC) beams: Quantification ofVsandVc

Influence of High Sulfate Mine Water on Spontaneous Combustion of Coal

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