Combined effects of salts and wetting–drying cycles on granite weathering

Zhao, Fei; Sun, Qiang; Zhang, Weiqiang

doi:10.1007/s10064-020-01773-3

Cited by 18 publications

(6 citation statements)

References 66 publications

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“…These slopes undergo a cyclical process of wetting and drying of the bedrock, driven by seasonal fluctuations in reservoir water levels. This phenomenon has been referred to as the rock wetting and drying cycle [1][2][3] .…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Wetting-Drying Cycle Weakening of Rock Mass on the Mechanical Behavior of Rock-Socketed Piles

Cao,

He,

Wang

et al. 2023

Preprint

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In order to investigate the influence of the weakening of the rock mass mechanical parameters on the mechanical behavior of the bridge rock-socketed pile on the slope under the condition of wetting and drying cycles, this study focuses on the sandy slate surrounding the rock-socketed piles at Luogu bridge in the Lianghekou reservoir area. Wetting and drying cycle tests were conducted to analyze the variations in rock mechanical parameters associated with these cycles, revealing the underlying weakening mechanisms. Employing the generalized Hoek-Brown criterion and finite-difference numerical simulation, the study systematically examines the evolution of the load-bearing behavior of rock-socketed piles after various wetting-drying cycles. The results indicate that, with an increase in the number of wetting-drying cycles, the uniaxial compressive strength, Young's modulus, cohesion, and internal friction angle of the rock progressively decrease, while Poisson's ratio steadily increases. Power and logarithmic function correlations between each mechanical parameter and the number of cycles are provided. The weakening of rock mechanical parameters due to wetting and drying cycles can be attributed to the disappearance of hydrolysis in hydration prone minerals and the aggregation of microscopic cracks. With increasing wetting and drying cycles, the axial force of the rock-socketed pile at the specified depth gradually increases, while the lateral frictional resistance decreases, and the resistance at the end of the pile tends to gradually increase. The total lateral frictional resistance of the rock-socketed pile shows an overall decreasing trend with increasing wetting-drying cycles. Deformation assessments of rock-socketed piles after different numbers of cycles reveal an inclination towards increased horizontal displacement at various depths and greater settlement at the top and bottom of the piles with more wetting-drying cycles.

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Section: Introductionmentioning

confidence: 99%

Study on the Influence of Wetting-Drying Cycle Weakening of Rock Mass on the Mechanical Behavior of Rock-Socketed Piles

Cao,

He,

Wang

et al. 2023

Preprint

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“…The effect of soluble salts has been known for centuries and has been widely studied [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] on porous building stones [17][18][19] and, in particular, on granitoids [20,21], limestones [22][23][24], sandstones [25,26], and travertines [27]. Different test methods have been used to explain and evaluate the crystallization process that damage rocks and, more generally, porous building materials [28].…”

Section: Introductionmentioning

confidence: 99%

“…In laboratory studies, salt-induced decay is made by either partial immersion [31] or full immersion [21,[32][33][34] in the saturated solutions of one or more mixed salts, followed by oven or air drying. Soluble-salt crystals are then usually analyzed by several characterization techniques, such as visual inspection, X-ray-powder diffraction [35], optical [25], Raman [36] and scanning-electron microscopy [37], simultaneous thermogravimetry, and differential scanning calorimetry [38].…”

Section: Introductionmentioning

confidence: 99%

The Crystallization Effect of Sodium Sulfate on Some Italian Marbles, Calcarenites and Sandstones

et al. 2022

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Soluble salts are compounds found inside ornamental rocks and building stones exposed to atmospheric agents in environments rich in alkaline metal ions, such as sodium and potassium. The damage induced by their crystallization in those materials, used to build monuments and architectural structures of great importance, is an unsolved problem. Sodium sulfate is one of the most common and harmful salt found in these constructions. In this work, we studied the resistance through time to the wet-drying cycles of some natural stones (calcarenites, marbles, and sandstones) that have been utilized in the historical architecture in Italy. Samples were freshly cut and thermally aged to simulate increasing decay. Induced porosity in the thermally degraded samples was high in calcarenites, medium in marbles, and low in sandstones. Specimens subjected to artificial thermal aging lost a major percentage of mass compared to the non-weathered ones, when affected by the crystallization of soluble salts. With this study, we have observed that samples subjected to different wetting and drying cycles degrade faster due to the action of soluble salts, compared to samples that are not subjected to these cycles.

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“…Their appearance is special since the grains of the constituent minerals found in granite are nicely outlined and clearly visible with the naked eye, therefore, are also preferred architecturally. Zhao et al [1] studied the effect of weathering on samples of granite. For this purpose, the samples were soaked in different concentrations of Na 2 SO 4 and MgSO 4 before the wetting-drying cycles.…”

Section: Introductionmentioning

confidence: 99%

Influence of Mineral Composition in Natural Granite Rocks on Microhardness

Kelemen-Cserta¹,

Gyurika²

2021

Hung. J. Ind. Chem.

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Granites are becoming increasingly popular and, as a result, their areas of use are expanding. In addition to their colour and particle size, the surface roughness of the machined material is becoming an important aspect of their application. In order to create a suitable surface roughness, the type of rocks located on the surface, elemental composition and microhardness of the minerals are important, because knowledge of these characteristics can be used to determine the machining parameters. Microhardness is affected by the atomic percentage values of Si, Al and Na. In addition, for some minerals, a correlation can also be established between the Si, Al and Na components.

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Combined effects of salts and wetting–drying cycles on granite weathering

Cited by 18 publications

References 66 publications

Study on the Influence of Wetting-Drying Cycle Weakening of Rock Mass on the Mechanical Behavior of Rock-Socketed Piles

Study on the Influence of Wetting-Drying Cycle Weakening of Rock Mass on the Mechanical Behavior of Rock-Socketed Piles

The Crystallization Effect of Sodium Sulfate on Some Italian Marbles, Calcarenites and Sandstones

Influence of Mineral Composition in Natural Granite Rocks on Microhardness

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