Assessing water-induced changes in tensile behaviour of porous limestones by means of uniaxial direct pull test and indirect methods

Rabat, Álvaro; Tomás, Roberto; Cano, Miguel

doi:10.1016/j.enggeo.2022.106962

Cited by 16 publications

(5 citation statements)

References 80 publications

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“…For this purpose, mechanical properties lar to those of steel and polymethyl methacrylate were selected [47]. Additionally, to address the influence of platen stiffness on the failure initi point, as well as in the associated failure pattern, three different limestone lithotypes used [48]. These limestones were selected to cover a wide spectrum of different 𝑈𝐶𝑆 and 𝜙 values, as shown in Table 2.…”

Section: Numerical Modelmentioning

confidence: 99%

“…These limestones were selected to cover a wide spectrum of different 𝑈𝐶𝑆 and 𝜙 values, as shown in Table 2. A new stress defined as 𝜎 , equal to 70% of the limestone lithotype 2 UCS value selected to normalize all of the stress states and simultaneously ensure that the re Additionally, to address the influence of platen stiffness on the failure initiation point, as well as in the associated failure pattern, three different limestone lithotypes were used [48]. These limestones were selected to cover a wide spectrum of different UCS, σ BD and ϕ values, as shown in Table 2.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Mechanical properties of the rocks employed to determine the failure initiation point are extracted from reference[48].…”

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confidence: 99%

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The Influence of Platen Stiffness on a Specimen’s Failure Initiation Point and the Failure Pattern of Brittle Materials in the Standardized Uniaxial Compression Test

Guerrero-Miguel,

Álvarez-Fernández,

Gutiérrez-Moizant

et al. 2024

Mathematics

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Uniaxial compressive strength is a variable necessary for adequately characterizing a material’s mechanical properties. However, a specimen’s geometric deviations and elastic properties may lead to undesirable stress states, which cause strong discrepancies between the results of the uniaxial compression test and its theoretical foundations. While geometric deviations may cause non-uniform contact between the platen and the specimen, elastic properties can provoke severe end effects that disturb the local stress field near the points of contact. To address how the relative stiffness between the platen and the specimen influences the induced stress field, numerical simulations considering the stiffness ratios Ep/Es=3, Ep/Es=1 and Ep/Es=0.05 were performed. Subsequently, these results were employed to establish the relation between relative stiffness and specimen failure patterns in brittle materials, particularly in three different rocks. The results prove that the platen stiffness must be accurately selected to match that of the tested material, in order to avoid undesirable local stress fields near the point of contact and to induce homogeneous uniaxial compression that guarantees reliable uniaxial compressive strength characterization. Furthermore, the brittle failure patterns reported in previous studies were correlated with the induced stress fields inside the specimen depending on its platen stiffness, allowing the validity of the test results to be verified based on a simple visual inspection.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%

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The Influence of Platen Stiffness on a Specimen’s Failure Initiation Point and the Failure Pattern of Brittle Materials in the Standardized Uniaxial Compression Test

Guerrero-Miguel,

Álvarez-Fernández,

Gutiérrez-Moizant

et al. 2024

Mathematics

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“…(2) Influence of solution properties: The erosion degradation of limestone is mainly controlled by the chemical dissolution of the solution and the mass transfer process of major mineral ions, and the degree of erosion degradation of the rock mass increases with decreasing solution pH 9 – 22 . (3) Influence of wet-dry cycle effects: During the wet-dry cycle process, the degree of degradation in the macroscopic physical and mechanical properties of limestone increases with the number of cycles 23 – 25 . (4) Influence of rock properties: Based on the quantitative analysis of the main rock-forming minerals, the erosion reaction rate and mechanical energy degradation rate of different limestone properties are determined under the same solution environment 26 , 27 .…”

Section: Introductionmentioning

confidence: 99%

Study on the process of mass transfer and deterioration of limestone under dynamic dissolution of CO2 solution

Dong,

Li,

Shen

et al. 2024

Sci Rep

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The long-term erosion of rock by solution can induce a series of karst problems. Therefore, this study focused on limestone and conducted dynamic dissolution experiments under deionized water and CO2 solution conditions to study the deterioration mechanism of limestone under nonequilibrium conditions. The results showed that the degree of degradation of the mechanical properties of the samples in a CO2 solution was obviously greater. In a deionized water environment, the degradation of the mechanical properties of the sample is mainly controlled by the physical softening action of the solution. In the CO2 solution environment, the degradation process can be divided into two stages. In the early stage of the experiment (10 days to 20 days), the degradation of mechanical properties of the sample is also controlled by the physical softening action of the solution. With increasing soaking time, the main rock-forming minerals of limestone gradually react with the CO2 solution, the degradation of the sample is controlled mainly by the chemical corrosion of the CO2 solution, and its degradation rate is much greater than that of physical softening. The results can be used as a reference for assessing the long-term stability of underground engineering in limestone karst development areas.

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“…Calcareous stone materials exposed in outdoor environments are strongly affected by the presence of water due to the capacity to solubilize and to precipitate calcite [1]. Water can penetrate the porosity of calcareous stone and wash away calcite grains, leading to a higher level of decohesion in the stone [2,3]. Furthermore, soluble salts can migrate toward the stone's surface, occluding its pores during water evaporation.…”

Section: Introductionmentioning

confidence: 99%

New Chemical Systems for the Removal of Calcareous Encrustations on Monumental Fountains: A Case Study of the Nymphaeum of Cerriglio

Squarciafico,

Salatino,

La Russa

et al. 2023

Heritage

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This study aims to compare the effects of some chemical agents on the removal of calcareous encrustations, which are characterized by the presence of both calcium and silicon. The experimentation was conducted during the conservation treatments of Cerriglio’s nymphaeum (Massa Lubrense, Naples, Italy). Tests were carried out in the laboratory on specimens and in situ to define the most efficient choice between several chelant agents, in the recovery of calcium and silicon, using ICP/OES and spectrocolorimetric and microscopic analyses.

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Assessing water-induced changes in tensile behaviour of porous limestones by means of uniaxial direct pull test and indirect methods

Cited by 16 publications

References 80 publications

The Influence of Platen Stiffness on a Specimen’s Failure Initiation Point and the Failure Pattern of Brittle Materials in the Standardized Uniaxial Compression Test

The Influence of Platen Stiffness on a Specimen’s Failure Initiation Point and the Failure Pattern of Brittle Materials in the Standardized Uniaxial Compression Test

Study on the process of mass transfer and deterioration of limestone under dynamic dissolution of CO2 solution

New Chemical Systems for the Removal of Calcareous Encrustations on Monumental Fountains: A Case Study of the Nymphaeum of Cerriglio

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