The effect of grain size and cement content on index properties of weakly solidified artificial sandstones

Atapour, Hashem; Mortazavi, Ali

doi:10.1088/1742-2140/aaa14a

Cited by 22 publications

(5 citation statements)

References 26 publications

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“…As analyzed in [80] bulk density has an inverse relationship with porosity; the same observation is repeated in this study (Figure 5b). Infusion of 5, 10 and 15 wt.…”

Section: Thermal Conductivitysupporting

confidence: 81%

Development of Insulating Masonry Bricks from Wood Fiber and Varying Milled Glass Proportion

Akinwande¹,

Balogun²,

Danso³

et al. 2023

J. Civ. Eng. Constr.

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Thermal efficient sandcrete bricks are masonry units with good thermal insulating properties. Wood fiber (WF) possesses low thermal conductivity, hence, its incorporation in mortar mix results in thermal efficient masonry units. Milled glass (MG) could be added for strength enhancement. This study incorporated WF into mortar mix at a constant dosage of 5 wt.%, with varying MG proportions of 0, 5, 10, 15 and 20 wt.% and cured for 7, 14 and 28 days. The results obtained showed minimization of porosity and water absorption at increasing MG content. Density and compressive strength were enhanced as MG content increased. Flexural and splitting tensile strengths appreciated and peaked at 15 wt.% MG. Thermal performance measured demonstrated progressive appreciation in thermal conductivity while specific heat capacity followed a downtrend as MG dosage increased. The study revealed that the collage of 5 wt. % wood fiber and 15 wt. % MG yielded optimum result. The study, therefore, concludes that the addition of milled glass and wood fiber positively and significantly affected the properties of sandcrete bricks. 15 wt.% of milled glass and 5% wood fiber inclusion in sandcrete bricks are recommended for use by construction practitioners.

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“…As analyzed in [80] bulk density has an inverse relationship with porosity; the same observation is repeated in this study (Figure 5b). Infusion of 5, 10 and 15 wt.…”

Section: Thermal Conductivitysupporting

confidence: 81%

Development of Insulating Masonry Bricks from Wood Fiber and Varying Milled Glass Proportion

Akinwande¹,

Balogun²,

Danso³

et al. 2023

J. Civ. Eng. Constr.

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“…Density can be used to obtain a preliminary indication of porosity. [ 93,94 ] As lower the density of a material, higher is the porosity, [ 95 ] from the estimated density values it is clear that porosity level in ZnO0 is higher than that of ZnO10. As porosity decreases when effective pressure on the material is increased and as samples were pelletized under high pressure for the dielectric measurements, the amount of void is naturally reduced in the pelletized samples while compared to that present in powdery as‐grown samples.…”

Section: Resultsmentioning

confidence: 99%

Dielectric Property, AC Conductivity, and Electric Modulus Studies of Pristine and Green‐Synthesized ZnO Nanoparticles

Sarkar,

Kundu,

Bhattacharjee

2024

Physica Status Solidi (a)

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Frequency‐dependent dielectric constant and dielectric loss of pristine and green‐synthesized (using Tabernaemontana divaricata flower extract) ZnO nanoparticles (NPs) are studied at different temperatures. Below 1 kHz frequency and at temperatures above 100 °C, ZnO NPs have giant dielectric constant values (≈3 × 104). At lower frequencies and at/below 100 °C, the nature of temperature dependence of dielectric constant for pristine and green‐synthesized ZnO NPs are reversed, and this anomalous temperature dependence is correlated with the in‐plane and out‐of‐plane thermal expansions of ZnO. A temperature‐dependent poly‐dispersive relaxation mechanism in ZnO has been observed. The electrical conduction mechanism is found to be significantly modulated by the use of flower extract. The electric modulus study suggests similar mechanism of electrical conduction and dielectric polarization followed in these materials. A plausible growth mechanism of the ZnO NPs in presence of the flower extract is explored. Variations in the dielectric constant, dielectric loss, conductivity, and polarization mechanisms of the ZnO NPs are understood as signatures of the capping effect of the phytochemicals present in the flower extract on the crystal growth and formation of grain boundaries.

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“…Guney et al (2005) stated that the estimation of engineering properties of rock materials (e.g., UCS via Schmidt rebound hardness) needs to be improved to account for more qualitative values that better represent the rock material, such as its origin, porosity, and grain shape. Atapour and Mortazavi (2018) produced artificial sandstones with different textural characteristics (median grain size: 0.31-1.63 mm and cement content: 15%-25%). They observed that the point load strength index and Schmidt rebound hardness of the samples increased as grain size increased.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of different surface characteristics and mineral grain size in the estimation of rock strength using the Schmidt hammer

Karaman

2024

J. S. Afr. Inst. Min. Metall.

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This study investigated the effect of surface roughness on Schmidt rebound hardness (Rl). Four different test surfaces of rock samples were studied: natural, ground, cut surfaces, and core samples. There was significant variability of standard deviation based on the Rl on the natural surface, which indicated high roughness of the rock surface, whereas surface polishing caused a significant decrease in standard deviation. ISRM and ASTM methods were compared to estimate unconfined compressive strength (UCS) for different testing surfaces. Rl obtained from the cut surface was found to be more reliable than those obtained from other testing surfaces for the prediction of UCS; however, regression and ANOVA analyses revealed that the ISRM method gave a more accurate UCS estimation of rocks with highly rough surfaces. It was also shown that Rl values obtained from a cut surface were significantly higher than those obtained from core samples. Therefore, a comparison between Rl values obtained from core samples and cut surfaces was made based on previous studies. This study statistically showed that estimated UCS values are not statistically significant if Schmidt rebound tests are not performed on similar surfaces. In addition, the mineral grain sizes of the studied rocks, different testing surfaces compared with those in literature, and standard deviation from Rl are evaluated and discussed. The Schmidt hammer technique is a rapid, inexpensive, and straightforward method for estimating UCS for preliminary assessment; however, roughness of the surface should be eliminated if variations are shown in the surface rebound hardness.

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The effect of grain size and cement content on index properties of weakly solidified artificial sandstones

Cited by 22 publications

References 26 publications

Development of Insulating Masonry Bricks from Wood Fiber and Varying Milled Glass Proportion

Development of Insulating Masonry Bricks from Wood Fiber and Varying Milled Glass Proportion

Dielectric Property, AC Conductivity, and Electric Modulus Studies of Pristine and Green‐Synthesized ZnO Nanoparticles

Evaluation of different surface characteristics and mineral grain size in the estimation of rock strength using the Schmidt hammer

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