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Research Article

Physico-durability aspects of partial substitution via pelletized fly ash lightweight nano-silica concrete

Waleed A. Abbas, Mohammed L. Abbas

Civil Engineering Dept., University of Technology- Iraq, Al-Sinaa Street, 10066 Baghdad, Iraq

Keywords

Abstract





High-performance lightweight concrete;

Nano-SiO2;

Cold-bonded;

Rapid chloride permeability test;

Water permeability;

Drying shrinkage

This study's main goal is to examine the durability and shrinkage properties of high-performance lightweight concrete (HPLC) which uses lightweight synthetic fly ash instead of some natural coarse aggregate. By combining 90% fly ash and 10% Portland cement by weight in a tilted rotating pan at room temperature and curing the aggregate for 28 days, the synthetic aggregate was created using the cold bonded pelletization procedure. Then, ten combination samples were made using HPLCs by substituting natural coarse aggregate for fly ash aggregate at percentages of 0, 10, 20, 30, and 40% of the aggregate's total volume with a water binder (w/b) ratio of 0.35 both with and without the addition of nano-SiO2 (nS). Durability characteristics, rapid chloride penetration and water permeability, were tested for 28 and 90 days, while drying shrinkage and weight loss were examined for 61 days. Results demonstrated a lower performance with control mix in terms of durability and shrinkage characteristics with increasing the coarse aggregate replacement (%) of lightweight aggregate (LWA). Additionally, nS improved the transport qualities by reducing the porosity traits and detrimental effects of synthetic LWAs. On the other hand, nS particle-related permeability decreases up to 23.34% due to a larger surface area and smaller particle size that made a permeability channel more meandering or partially closed. HPLCs mixes greatly reduce the overall shrinkage strain when adding 3% nS to HPLC specimens by 11.73% over 61 days. The statistical models that were derived indicated that the independent variables have a statistically significant impact.

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01/01/2024 Best Paper Award: The winners of 2023 Best Paper Award of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Author Awards section.


01/01/2024 Most Cited Paper Award: The winners of 2023 Most Cited Paper Award of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Author Awards section.


01/01/2024 Reviewer Awards: The winners of 2023 reviewer awards of Research on Engineering Structures and Materials (RESM) are announced. More information can be found at Reviewer Awards section.


8/12/2023 Special Issue: Embark on a journey of innovation with the journal of Research on Engineering Structures and Materials as we unveil a compelling opportunity for contributors in our upcoming special issue, "Design, Analysis, and Manufacturing of Composite Vehicle Structures." Led by distinguished Guest Editors Liubov Gavva and Oleg Mitrofanov from Moscow Aviation Institute. For more info see the link.


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2023 Reviewer Awards:

Please, visit Reviewer Awards section for the winners of the 2022 RESM reviewer awards.



2023 Best Paper Award:

The paper authored by Ferzan Fidan, Naim Aslan, Mümin Mehmet Koç entitled as “Morpho-structural and compressive mechanical properties of graphene oxide reinforced hydroxyapatite scaffolds for bone tissue applications” is awarded.



2023 Most Cited Paper Award:

The paper authored by Ercan Işık, Ehsan Harirchian, Hüseyin Bilgin, Kirti Jadhav entitled as “The effect of material strength and discontinuity in RC structures according to different site-specific design spectra" is awarded.


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