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Disintegration behavior and mechanism of carbonaceous mudstone under acidic corrosion and wetting-drying cycles
https://orcid.org/0000-0001-8167-1049
Abstract The disintegration of carbonaceous mudstone under the recurring action of acid rain increases the risk of geohazard occurrence. In this paper, a series of disintegration tests were conducted at pH values of 1, 3, 5, and 7 to investigate the disintegration behavior and disintegration mechanism of carbonaceous mudstone under acidic corrosion and wetting-drying cycles. The disintegration process can be divided into three stages (e.g., water absorption saturation, fracture expansion, and surface exfoliation). With the increase of wetting-drying cycles, the particle size of carbonaceous mudstone gradually decreases, and the particle size gradation curve of carbonaceous mudstone after disintegration is S-shaped, which is consistent with Weibull function distribution. A smaller value of the Weibull model parameter λ (the scale parameter) results in a smaller average particle size of the carbonaceous mudstone disintegration products, and the value of k (the shape parameter) reveals the degree of drastic change in the grain gradation of carbonaceous mudstone k and λ together reflect the rate of carbonaceous mudstone disintegration. A smaller decrease in the disintegration ratio and decreasing rate is observed with an increase in the number of wetting-drying cycles. The disintegration ratios of carbonaceous mudstone under the four pH conditions from largest to smallest are pH = 7 > pH = 5 > pH = 3 > pH = 1. The disintegration of carbonaceous mudstone is mainly caused by hydration-swelling, adsorption-fracturing, and dissolution-erosion. The presence of acid promotes the dissolution-erosion of carbonate in carbonaceous mudstones, which in turn accelerates the hydration-swelling and adsorption-fracturing as well as the disintegration ratio of carbonaceous mudstones.
Disintegration behavior and mechanism of carbonaceous mudstone under acidic corrosion and wetting-drying cycles
https://orcid.org/0000-0001-8167-1049
Abstract The disintegration of carbonaceous mudstone under the recurring action of acid rain increases the risk of geohazard occurrence. In this paper, a series of disintegration tests were conducted at pH values of 1, 3, 5, and 7 to investigate the disintegration behavior and disintegration mechanism of carbonaceous mudstone under acidic corrosion and wetting-drying cycles. The disintegration process can be divided into three stages (e.g., water absorption saturation, fracture expansion, and surface exfoliation). With the increase of wetting-drying cycles, the particle size of carbonaceous mudstone gradually decreases, and the particle size gradation curve of carbonaceous mudstone after disintegration is S-shaped, which is consistent with Weibull function distribution. A smaller value of the Weibull model parameter λ (the scale parameter) results in a smaller average particle size of the carbonaceous mudstone disintegration products, and the value of k (the shape parameter) reveals the degree of drastic change in the grain gradation of carbonaceous mudstone k and λ together reflect the rate of carbonaceous mudstone disintegration. A smaller decrease in the disintegration ratio and decreasing rate is observed with an increase in the number of wetting-drying cycles. The disintegration ratios of carbonaceous mudstone under the four pH conditions from largest to smallest are pH = 7 > pH = 5 > pH = 3 > pH = 1. The disintegration of carbonaceous mudstone is mainly caused by hydration-swelling, adsorption-fracturing, and dissolution-erosion. The presence of acid promotes the dissolution-erosion of carbonate in carbonaceous mudstones, which in turn accelerates the hydration-swelling and adsorption-fracturing as well as the disintegration ratio of carbonaceous mudstones.
Disintegration behavior and mechanism of carbonaceous mudstone under acidic corrosion and wetting-drying cycles
https://orcid.org/0000-0001-8167-1049
Abstract The disintegration of carbonaceous mudstone under the recurring action of acid rain increases the risk of geohazard occurrence. In this paper, a series of disintegration tests were conducted at pH values of 1, 3, 5, and 7 to investigate the disintegration behavior and disintegration mechanism of carbonaceous mudstone under acidic corrosion and wetting-drying cycles. The disintegration process can be divided into three stages (e.g., water absorption saturation, fracture expansion, and surface exfoliation). With the increase of wetting-drying cycles, the particle size of carbonaceous mudstone gradually decreases, and the particle size gradation curve of carbonaceous mudstone after disintegration is S-shaped, which is consistent with Weibull function distribution. A smaller value of the Weibull model parameter λ (the scale parameter) results in a smaller average particle size of the carbonaceous mudstone disintegration products, and the value of k (the shape parameter) reveals the degree of drastic change in the grain gradation of carbonaceous mudstone k and λ together reflect the rate of carbonaceous mudstone disintegration. A smaller decrease in the disintegration ratio and decreasing rate is observed with an increase in the number of wetting-drying cycles. The disintegration ratios of carbonaceous mudstone under the four pH conditions from largest to smallest are pH = 7 > pH = 5 > pH = 3 > pH = 1. The disintegration of carbonaceous mudstone is mainly caused by hydration-swelling, adsorption-fracturing, and dissolution-erosion. The presence of acid promotes the dissolution-erosion of carbonate in carbonaceous mudstones, which in turn accelerates the hydration-swelling and adsorption-fracturing as well as the disintegration ratio of carbonaceous mudstones.
Disintegration behavior and mechanism of carbonaceous mudstone under acidic corrosion and wetting-drying cycles
Fu, Hong-yuan (author) / Zha, Huan-Yi (author) / Zeng, Ling (author) / Gao, Qian-feng (author)
2023
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18