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Evaluation of microstructure deterioration inside sandstone under three different freezing-thawing cycle treatments
Abstract This paper investigated the microstructure deterioration of sandstones under three commonly used freezing-thawing (F-T) cycle treatments and compared the thermal-induced damage caused by these F-T treatments. Firstly, a series of F-T cycle treatments were carried out on the sandstones by the three F-T methods namely freezing in water and thawing in water (W-W), freezing in air and thawing in water (A-W), and freezing in air and thawing in air (A-A), respectively. Then, computed tomography (CT) tests were performed to observe the variations in microdefects of sandstones from planar and spatial levels, which were quantitatively described by areal porosity and volumetric porosity. Moreover, the damage factor was introduced to describe the damage evolutions of sandstones under F-T cycles and compare the differences in microstructure deterioration induced by the three F-T treatments. Finally, a damage estimation model based on the simplest F-T treatment method (A-A) was established to estimate the damage degree of sandstones under the W-W and A-W treatments. The results showed that under the three F-T treatments, the microdefects of sandstones developed, the areal porosities, volumetric porosities, damage factors, and damage difference coefficients increased as the number of F-T cycles increased. However, the different F-T treatments had different effects on the microstructure deterioration of sandstones. As the number of cycles increased to 50, the W-W treatment caused the most serious damage to sandstone, followed by A-W and A-A treatments. In addition, the damage estimation model based on the A-A treatment can effectively estimate the damage degree of sandstones under W-W and A-W treatments.
Evaluation of microstructure deterioration inside sandstone under three different freezing-thawing cycle treatments
Abstract This paper investigated the microstructure deterioration of sandstones under three commonly used freezing-thawing (F-T) cycle treatments and compared the thermal-induced damage caused by these F-T treatments. Firstly, a series of F-T cycle treatments were carried out on the sandstones by the three F-T methods namely freezing in water and thawing in water (W-W), freezing in air and thawing in water (A-W), and freezing in air and thawing in air (A-A), respectively. Then, computed tomography (CT) tests were performed to observe the variations in microdefects of sandstones from planar and spatial levels, which were quantitatively described by areal porosity and volumetric porosity. Moreover, the damage factor was introduced to describe the damage evolutions of sandstones under F-T cycles and compare the differences in microstructure deterioration induced by the three F-T treatments. Finally, a damage estimation model based on the simplest F-T treatment method (A-A) was established to estimate the damage degree of sandstones under the W-W and A-W treatments. The results showed that under the three F-T treatments, the microdefects of sandstones developed, the areal porosities, volumetric porosities, damage factors, and damage difference coefficients increased as the number of F-T cycles increased. However, the different F-T treatments had different effects on the microstructure deterioration of sandstones. As the number of cycles increased to 50, the W-W treatment caused the most serious damage to sandstone, followed by A-W and A-A treatments. In addition, the damage estimation model based on the A-A treatment can effectively estimate the damage degree of sandstones under W-W and A-W treatments.
Evaluation of microstructure deterioration inside sandstone under three different freezing-thawing cycle treatments
Fan, Lifeng (author) / Qiu, Bei (author) / Gao, Jingwei (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
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