Experimental Studies on the Homogeneity and Compressive Strength Prediction of Recycled Aggregate Concrete (RAC) Using Ultrasonic Pulse Velocity (UPV)

Handika, Nuraziz; Norita, Balqis Fara; Tjahjono, Elly; Arijoeni, Essy

doi:10.32783/csid-jid.v3i2.111

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…A much higher DOC of Ca(OH) 2 yields a low compressive strength, while a lower DOC of Mg(OH) 2 results in a much higher compressive strength. These intriguing differences can be attributed to the discrepancy in structural homogeneity , and porosity , of compacts, which is a result of different reaction rates and associated volume changes. Besides, carbonation of Ca(OH) 2 and Mg(OH) 2 may be supplementary in terms of water release and consumption, respectively.…”

Section: Resultsmentioning

confidence: 99%

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation

Zhang

Liu

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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There is a potential for leveraging the synergy of carbonation of portlandite and Mg-based binders to improve the CO 2 uptake, mechanical property, and thermodynamic stability of Mg-and Ca-based binders and enable its application. This work reports insights into the carbonation behavior of Mg(OH) 2 −Ca(OH) 2 (MH−CH) mixtures including the precipitation of different carbonates, degree of reaction of each phase, mechanical properties, microstructure characterization, and thermodynamic stability. Results indicate that the compressive strength and degree of carbonation (DOC) of compacts increase first and then decrease with the increase of the Ca(OH) 2 content. The compact containing 25% Ca(OH) 2 yields the highest compressive strength of 91.4 MPa, while the compact containing 75% Ca(OH) 2 has the highest DOC of 91.2%. The formation of nesquehonite with a lower density in compacts with lower contents of Ca(OH) 2 (0 and 25%) results in a higher volume increase even at a very low DOC (14.2%), leading to a more densified structure in the compacts. Compacts with higher contents of Ca(OH) 2 (50, 75, and 100%) precipitate calcite and magnesium calcite with higher thermodynamic stability than nesquehonite and improved water stability. Meanwhile, the high temperature in the initial stage of Ca(OH) 2 carbonation causes severe water evaporation and insufficient water in compacts, thus restricting the continuous carbonation at the center having a lower DOC than the surface. The mixing of Mg(OH) 2 and Ca(OH) 2 significantly enhances the carbonation degree of both hydroxides, which may be explained by the complementation of Ca(OH) 2 and Mg(OH) 2 carbonation, in which the water released by the carbonation of Ca(OH) 2 is bound to the crystal structure of hydrated magnesium carbonates (HMCs) from Mg(OH) 2 carbonation.

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Section: Resultsmentioning

confidence: 99%

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation

Zhang

Liu

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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“…It can be seen that a lower-strength specimen tends to have a lower velocity. A slower wave propagation gives a less hardened concrete and thus a lower compressive strength [31]. However, the FNS-100 cylinder specimens tend to have the highest pulse velocity, although their compressive strengths were lower than FNS-50 at ages 14 and 28 days.…”

Section: Ultrasonic Pulse Velocitymentioning

confidence: 93%

“…However, the FNS-100 cylinder specimens tend to have the highest pulse velocity, although their compressive strengths were lower than FNS-50 at ages 14 and 28 days. This behavior is considered to be an anomaly since, generally, study results have stated a positive correlation between Ultrasonic Pulse Velocity and compressive strength [31][32][33][34]. The unconverted compressive strengths previously obtained were plotted agai UPV to provide a relationship between compressive strength and UPV.…”

Section: Ultrasonic Pulse Velocitymentioning

confidence: 99%

Mechanical Properties of Concrete Containing Ferronickel Slag as Fine Aggregate Substitute Using Digital Image Correlation Analysis

Ernawan,

Sjah,

Handika

et al. 2023

Buildings

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This study aimed to analyze the mechanical, displacement, and strain properties of concrete with Ferronickel Slag (FNS) fine aggregate substitute (0%, 50%, and 100%, by mass, later called FNS-0, FNS-50, and FNS-100, respectively) experimentally using the Digital Image Correlation (DIC) method and the Ultrasonic Pulse Velocity (UPV) test. The FNS used in this study is a by-product that came from a Ferronickel smelter in Indonesia coupled with manufactured sand (M-sand) as the fine aggregate control. A D10 × 20 cm3 cylinder and 15 × 15 × 15 cm3 cube specimens were used to analyze the density, compressive strength, and UPV. Additionally, the cube specimens were tested using the DIC method to analyze the displacement and strain properties. The test results show the highest compressive strength was obtained by FNS-50, followed by FNS-100 and FNS-50. The highest pulse velocity was obtained by FNS-100, followed by FNS-50 and FNS-0. The load–displacement response and strain behavior indicate the specimen that had the most load resistance was FNS-50, followed by FNS-100 and FNS-0. Poisson’s ratio obtained using DIC and strain gauges showed consistent results where FNS-0 had the highest values, followed by FNS-50 and FNS-100. Overall, concrete with FNS substitute showed higher density, compressive strength, pulse velocity, and stiffness, as well as lower Poisson’s ratio compared to control concrete (FNS-0).

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Reviewing the performance of concrete comprising recycled coarse aggregates using non-destructive tests

Gagan,

Singh

2023

Materials Today: Proceedings

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Experimental Studies on the Homogeneity and Compressive Strength Prediction of Recycled Aggregate Concrete (RAC) Using Ultrasonic Pulse Velocity (UPV)

Cited by 4 publications

References 11 publications

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation

Mechanical Properties of Concrete Containing Ferronickel Slag as Fine Aggregate Substitute Using Digital Image Correlation Analysis

Reviewing the performance of concrete comprising recycled coarse aggregates using non-destructive tests

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Experimental Studies on the Homogeneity and Compressive Strength Prediction of Recycled Aggregate Concrete (RAC) Using Ultrasonic Pulse Velocity (UPV)

Cited by 4 publications

References 11 publications

Elucidating the Interaction Mechanism of Mg(OH)2 and Ca(OH)2 under Enforced Carbonation

Elucidating the Interaction Mechanism of Mg(OH)2 and Ca(OH)2 under Enforced Carbonation

Mechanical Properties of Concrete Containing Ferronickel Slag as Fine Aggregate Substitute Using Digital Image Correlation Analysis

Reviewing the performance of concrete comprising recycled coarse aggregates using non-destructive tests

Contact Info

Product

Resources

About

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation

Elucidating the Interaction Mechanism of Mg(OH)₂ and Ca(OH)₂ under Enforced Carbonation