Effect of water saturation on strength and deformability of building calcarenite stones: Correlations with their physical properties

Rabat, Álvaro; Cano, Miguel; Tomás, Roberto

doi:10.1016/j.conbuildmat.2019.117259

Cited by 45 publications

(14 citation statements)

References 37 publications

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“…The greater values of σpeak, σres and Et obtained in R-1 in both conditions (dry and saturated states) may be explained by its lower porosity and higher density and P-wave velocity in comparison with R-2 and R-3, which exhibit similar mechanical behaviour and physical characteristics. In this sense, several authors have proposed increasing exponential or power correlation functions between physical properties (such as ρdry and vP) and mechanical properties (UCS and Et) as well as decreasing potential correlation functions between p and UCS (or Et) for sedimentary rock materials such as sandstones, travertines and calcarenites [20], [32], [54], [55]. The triaxial testing data of each building stone in dry and saturated conditions are summarized in Table 2.…”

Section: Triaxial Compression Testsmentioning

confidence: 99%

“…Specifically, in this work, three porous building stones with open porosities ranging from 10 to 18% and widely utilised in architectural constructions (monuments, emblematic buildings, stone masonry walls, building facades and decorative features) and civil engineering elements (bridge pillars, retaining systems, rockfills and foundations) were studied. Preliminary UCS tests carried out in quite similar materials showed that water saturation can cause significant reductions on their UCS when are saturated [32]. However, the influence of water under triaxial compression, which denotes a more genuine behaviour in specific situations, has not been studied in these building calcarenite stone varieties until now.…”

Section: Introductionmentioning

confidence: 99%

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Impact of water on peak and residual shear strength parameters and triaxial deformability of high-porosity building calcarenite stones: Interconnection with their physical and petrological characteristics

Rabat

Tomás

Cano

et al. 2020

Construction and Building Materials

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Several studies have found that water can cause substantial reductions of mechanical properties of building stones such as unconfined compressive strength, tangent Young´s modulus or tensile strength. However, the influence of water content on shear strength parameters, triaxial compressive strength and modulus of elasticity under different confining pressures has been scarcely examined. For this reason, the present paper assesses the impact of water on peak and residual compressive strength and tangent Young´s modulus of three porous building geomaterials widely used in civil and architectural constructions under different confining pressure through triaxial compressive tests. Furthermore, the corresponding peak and residual shear strength parameters computed from Mohr-Coulomb (c and ϕ) and from Hoek-Brown (σci and mi) failure criteria are obtained under dry and saturated conditions. Complementary physical and petrological analyses are performed in order to understand the main causes of the effect of water observed in these rock materials. The results indicate that water causes significant reductions of peak and residual compressive strength and tangent Young´s modulus in the tested porous building stones for all the different applied confining pressures. Additionally, important changes of peak and residual shear strength parameters (c, ϕ, σci and mi) are exhibited by the studied stones when become saturated. This could be related to physicochemical changes such as the hydrolysis of quartz and silicates in crack tip region inducing subcritical crack growth (stress corrosion), the decrease of the cement quality and the deterioration of the intergranular bonds due to the dispersion or dissolution of some minerals (calcite or chlorite) and the formation of microcracks caused by the swelling of the clay minerals present in these materials when they come into contact with water.

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Section: Triaxial Compression Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of water on peak and residual shear strength parameters and triaxial deformability of high-porosity building calcarenite stones: Interconnection with their physical and petrological characteristics

Rabat

Tomás

Cano

et al. 2020

Construction and Building Materials

Self Cite

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“…Referring to the related research results in the field of rock mechanics [38][39], this study used exponential, logarithmic, and power functions to fit and analyze the relationship between the CPB strength and water saturation. The results are shown in Figure 6.…”

Section: Influence Of Water Saturation On Strengthmentioning

confidence: 99%

Influence of water saturation on the strength characteristics and deformation behavior of hardened cement paste backfill

Wang

2021

Preprint

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In this study, a uniaxial compression experimental was conducted to examine the mechanical properties of hardened cemented paste backfill (CPB) with different water saturations (0.18%, 4.98%, 9.30%, 21.6%, 32.8%, and 100%). The experimental results demonstrated that water saturation loosened the overall structure of the CPB, which led to the deterioration of its mechanical properties. As the water saturation increased, the uniaxial compressive strength (UCS), residual strength, strength difference, deformation modulus, secant modulus, E50 (the secant modulus at 50% of the UCS), peak strain, and elastic strain decreased, while the plastic strain ratio increased. The UCS, E50, and peak strain demonstrated exponential function relationships with the water saturation. After the peak point, when the water saturation was less than 20%, the strength of the CPB decreased rapidly, and when the water saturation was greater than 30%, the strength decreased slowly. Lastly, the plastic strain, the strain at 50% of the UCS, and the strain at the maximum secant modulus conformed to the normal distribution, and the water saturation had a minimal impact on these three strains. The fractal dimension, D, of the cracks in the CPB increased exponentially with increasing water saturation and demonstrated a negative linear correlation with the UCS.

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“…During the process of cryogenic fracturing, the use of LN 2 can produce a high thermal gradient and a rapid temperature change in the rock inner and outer body, leading to a greater thermal stress and more thermal cracks in HDRs compared with traditional water/air cooling [11]. Water was often used as a coolant in previous works, but water has the disadvantage that can even cause important reductions in the mechanical properties of nonheat-treated rocks [12,13]. Consequently, the physicomechanical properties of the HDR reservoirs are greatly influenced by LN 2 cooling treatments.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Mechanical and Permeability Evolution Effects of High-Temperature Granite Exposed to a Rapid Cooling Shock with Liquid Nitrogen

Wang

Xue

et al. 2021

Geofluids

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Liquid nitrogen (LN2), which can greatly improve the efficiency of hot dry rock (HDR) mining, is commonly used as a cooling material in the enhanced geothermal system (EGS). Physical property, triaxial compression, and permeability tests were undertaken on treated granite samples, for a better scientific understanding of the effect of the LN2 cooling method on the mechanical and permeability properties of the rocks after heat treatment. The experimental results indicated that the physical properties of the treated granite change significantly, such as the density and wave velocity are substantially reduced. Meanwhile, with the increase of treatment temperature, the macroscopic cracks on its surface are gradually generated and the volume is expanded clearly. In addition, the surface wettability of granite gradually increases with increasing temperature. Compared with the air/water cooling methods, under LN2 cooling condition, the mechanical properties decrease markedly. When the temperature exceeds 600°C, the granite strength decreases significantly to only 56.16% of the reference value. The deformation properties also change significantly, with a final strain of about 3% at failure for a sample at 800°C, showing an obvious ductile deformation characteristic. Further, an appreciable correlation also exists between the initial permeability of granite and temperature. Once the temperature exceeds 200°C, the increase in temperature contributes to the increase in initial permeability. In addition to the effect of temperature, the increase in load also leads to a change in the permeability coefficient. When the temperature reaches 600°C, the permeability of granite first decreases and then increases with the increases in axial stress. The results of this paper are valuable in understanding the effect of thermal shock by LN2 on the fracturing efficiency and permeability characteristics of dry hot rocks.

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Effect of water saturation on strength and deformability of building calcarenite stones: Correlations with their physical properties

Cited by 45 publications

References 37 publications

Impact of water on peak and residual shear strength parameters and triaxial deformability of high-porosity building calcarenite stones: Interconnection with their physical and petrological characteristics

Impact of water on peak and residual shear strength parameters and triaxial deformability of high-porosity building calcarenite stones: Interconnection with their physical and petrological characteristics

Influence of water saturation on the strength characteristics and deformation behavior of hardened cement paste backfill

Investigation of the Mechanical and Permeability Evolution Effects of High-Temperature Granite Exposed to a Rapid Cooling Shock with Liquid Nitrogen

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