Effect of grain characteristics and cement content on the unconfined compressive strength of artificial sandstones

Fattahpour, Vahidoddin; Baudet, BA; Moosavi, M.; Mehranpour, M. H.; Ashkezari, A. Zarepor

doi:10.1016/j.ijrmms.2014.09.008

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…Specifically, an UCS increase in the range 6.1e7.4 MPa was observed between 4:1 and 3:1 soil:grout ratio samples due to the increasing of cement amount. Data are consistent with Fattahpour et al (2014), who reported, for silica sand-cement mixtures, an UCS variation of about 6 MPa with an 8% increasing of cement, highlighting that, especially in the presence of quartz, the cement content is a predominant factor affecting the strength of the S/S samples.…”

Section: Resultssupporting

confidence: 91%

Performance study and influence of radiation emission energy and soil contamination level on γ-radiation shielding of stabilised/solidified radionuclide-polluted soils

Falciglia

Puccio

Romano

et al. 2015

Journal of Environmental Radioactivity

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Section: Resultssupporting

confidence: 91%

Performance study and influence of radiation emission energy and soil contamination level on γ-radiation shielding of stabilised/solidified radionuclide-polluted soils

Falciglia

Puccio

Romano

et al. 2015

Journal of Environmental Radioactivity

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“…Hence, more porous sandstones have more voids and higher porosity, reducing the strength of the rock skeleton [ 15 ]. The negative linear trend of the mean grain size on the predicted UCS from Equation (7) is consistent with the past findings on artificial sandstones [ 50 ]. This observation can be explained by the fact that larger grains have longer grain boundaries, which provide more flaws for the nucleation of cracks and stress concentration [ 51 ].…”

Section: Unconfined Compressive Strength (Ucs)supporting

confidence: 91%

Effect of Physical Properties on Mechanical Behaviors of Sandstone under Uniaxial and Triaxial Compressions

Alomari

Khatri

et al. 2023

Materials

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Mechanical properties of sandstone, such as compressive strength and young’s modulus, are commonly used in the design of geotechnical structures and numerical simulation of underground reservoirs using models such as the digital groundwater, equivalent porous medium, and Discrete Fracture Network (DFN) models. A better understanding of the mechanical behaviors of sandstone under different loading conditions is imperative when assessing the stability of geotechnical structures. This paper highlights the effect of the physical properties (i.e., porosity, mean grain size) and environmental conditions (i.e., water content and confining stress) on uniaxial compressive strength, triaxial compressive strength, and young’s modulus of sandstone. A series of uniaxial and triaxial compression experiments are conducted on sandstone formations from Wyoming. In addition, experimental data on sandstones from the literature are compiled and integrated into this study. Prediction equations for the compressive strengths and young’s modulus of sandstone are established based on commonly available physical properties and known environmental conditions. The results show that the mean Uniaxial Compressive Strength (UCS) decreases as the porosity, water content, and mean grain size increase. Furthermore, a predictive empirical relationship for the triaxial compressive strength is established under different confinements and porosity. The relationship suggests that the mean peak compressive strength increases at a higher confinement and decreases at a higher porosity. The results and recommendations provide a useful framework for evaluating the strength and deformation of most sandstone.

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“…In general, a high clay content can lessen the rock's strength because the degree of cementation decreases, especially in the presence of water 108 . Besides, porosity reduction would lead to an increase in rock strength 6 , 12 , 15 , 109 . The results in Fig.…”

Section: Resultsmentioning

confidence: 99%

Effects of type and distribution of clay minerals on the physico-chemical and geomechanical properties of engineered porous rocks

Iranfar

Karbala

Shakiba

et al. 2023

Sci Rep

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The study of the properties of engineered rocks is of great importance to researchers in engineering sciences such as petroleum, mining, and civil engineering owing to their wide application in these fields. In the present study, a physico-chemical and geomechanical investigation was carried out on the effects of different clay minerals on porous rocks. Various chemical products formed during chemical interactions between cement, clay minerals, and water can change the pore structure and thus the rock characteristics. The results of the current study showed that increasing the clay content could remarkably reduce the porosity and permeability of the rock by an average of 86% and 6.76%, respectively. In this regard, samples containing kaolinite were further influenced due to their new pore structure. Moreover, a power relationship was found between sonic velocity and porosity, which can be used to predict rock properties. Chemical analysis indicated an amplification in quantities of chemical products, particularly calcium silicate hydrate and portlandite, due to an increase in clay content. The impacts of porosity and cementation quality as two main factors on rock strength have also been studied. The outcomes revealed that a reduction in porosity could compensate for detrimental effects of poor bond quality and consequently improved UCS by up to 30% in samples containing kaolinite, while decreasing the degree of cementation prevailed over the porosity reduction in specimens including illite and resulted in a 14% decrease in UCS. The effects of porosity and bond quality on UCS would cancel each other out in samples containing bentonite. It is worth noting that when it comes to changes in geomechanical characteristics, the dominant factor (i.e., porosity reduction or cementation quality) determines the ultimate effect of clay minerals on the properties of engineered porous rocks.

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Effect of grain characteristics and cement content on the unconfined compressive strength of artificial sandstones

Cited by 12 publications

References 20 publications

Performance study and influence of radiation emission energy and soil contamination level on γ-radiation shielding of stabilised/solidified radionuclide-polluted soils

Performance study and influence of radiation emission energy and soil contamination level on γ-radiation shielding of stabilised/solidified radionuclide-polluted soils

Effect of Physical Properties on Mechanical Behaviors of Sandstone under Uniaxial and Triaxial Compressions

Effects of type and distribution of clay minerals on the physico-chemical and geomechanical properties of engineered porous rocks

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