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Research Article

The effect of using recycled materials (sand and fine powder) from demolished concrete waste in alluvial sand mortar

Samir Kennouche1,2Allaoua Belferrag1,2Djamel Boutoutaou1,2Samia Bouzouaid1,2Hachem Chaib1,2

1Department of Civil Engineering and Hydraulics, University Kasdi Merbah Ouargla, Ouargla 30000, Algeria

2Laboratoire d'Exploitation et Valorisation des Ressources Naturelles en Zones Arides, Ouargla 30000, Algeria.

Keywords

Abstract



Mortar;


Alluvial sand;


Recycled sand;


Concrete waste powder fine;


Compressive strength;


Shrinkage

This article evaluates the possibility of a mortar preparation incorporating recycled demolition concrete waste (RDCW). These allow mortars to be produced in two ways: the first in the form of recycled aggregates (RA) to partially replace alluvial sand (AS) (natural sand) and the second in the form of the fine fraction of the waste concrete powder (CWPF) obtained by screening recycled sand (RS) from construction and demolition waste (CDW) to replace Portland cement in the production of composites. The CWPF fraction used is composed of particles having a diameter of less than 0.08 mm. Mortar mixtures were designed with three different RS replacement ratios (0%, 15% and 25%) and varying percentages of CWPF (5%, 10% and 15%). The W/C ratio was designed in 0.53 for all mixes. Mechanical properties such as compressive strength and theological properties (shrinkage) of the prepared mortars were studied. The results show that the material studied has lower mechanical properties than an ordinary mortar, but these are acceptable and indicative, except that the mixture prepared with 75% A Sand 25% Reregister an increase in mechanical resistance at (long term) 90 days. The reverse is true for shrinkage, where adding RS and CWPF with percentages up to 15% and 10% respectively has a positive effect on the mortars studied. These results contribute to the use of FCPW in composites products.

© 2023 MIM Research Group. All rights reserved.

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2023 Reviewer Awards:

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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.



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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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