<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The main objective of this study is the recovery of dune sands and rubber waste (powders). The latter constitutes a potential source of several environmental and economic problems.</p>
<p>The objective of this present work is to examine the ability to use dune sand for the preparation of mortars with sufficient physico-mechanical properties to allow them to be used in various building construction applications. The formulation of the mixtures is based on replacing dune sand with powders, at different weight contents: 10 %, 20 %, and 30 %. The quantity of cement is set at 450 <italic>g</italic>. The results obtained show in the first place that the particle size of the mixture tends to be spread out with a remarkable increase in the fineness modulus, and in the second place the density of the mixture decreases by 6.5 % (for the apparent) and by 10 % (for the absolute), which means the calculation of loads for the resulting mortar must decrease. Porosity has decreased to 20 % and absorption has increased to 30%. The strengths have decreased over 40 % for compressive strength and over 30 % for tensile strength, with an improvement in the relationship between the two strengths.</p>
</abstract>

The main objective of this study is the recovery of dune sands and rubber waste (powders). The latter constitutes a potential source of several environmental and economic problems.
The objective of this present work is to examine the ability to use dune sand for the preparation of mortars with sufficient physico-mechanical properties to allow them to be used in various building construction applications. The formulation of the mixtures is based on replacing dune sand with powders, at different weight contents: 10 %, 20 %, and 30 %. The quantity of cement is set at 450 g. The results obtained show in the first place that the particle size of the mixture tends to be spread out with a remarkable increase in the fineness modulus, and in the second place the density of the mixture decreases by 6.5 % (for the apparent) and by 10 % (for the absolute), which means the calculation of loads for the resulting mortar must decrease. Porosity has decreased to 20 % and absorption has increased to 30%. The strengths have decreased over 40 % for compressive strength and over 30 % for tensile strength, with an improvement in the relationship between the two strengths.

Valuation of Rubber Waste and Dune Sand: mortar for construction and environmental protection

Materials and Geoenvironment

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The main objective of this study is the recovery of dune sands and rubber waste (powders). The latter constitutes a potential source of several environmental...

Rubber content (%)	0	10	20	30
Fineness modulus (%)	1.837±0,027	1.93±0,043	1.98±0,056	2.20±0,068
Wet density (g/cm³)	1.75±0.026	1.7±0.016	1.65±0.004	1.63±0.013
Dry density (g/cm³)	1.56±0.045	1.55±0.023	1.5±0.006	1.48±0.01
Absorption (%)	12.1±1.85	9.81±0.62	9.77±0.08	10.64±0.12
Porosity (%)	18.86±2.39	15.21±0.73	14.69±0.09	15.71±0.27
Tensile strength (MPa)	5,47±1.11	4.95±0.31	4,71±1.41	3,36±0.61
Compressive strength (MPa)	26,51±2.46	18,44±0.29	17,33±0.77	14,01±1.00

	CaO	SiO₂	Al₂O₃	Fe₂O₃	MgO	K₂O	Na₂O	SO₃	LoI*
Cement	58.6	24.92	6.58	3.65	1.21	0.85	0.08	2.17	1.7
Dune Sand	1.63	90.46	1.38	1.92	0.39	0.22	0.00	0.2	2.56

Rubber content (%)	0	10	20	30
Dune Sand (g)	1350	1215	1080	945
Cement (g)	450	450	450	450
Water (g)	450	450	450	450
Rubber Caoutchouc (g)	0	60.14	120.28	180.42
Water/Cement	1	1	1	1

	Unit	Dune Sand	Cement	RC
Finess modulus	(%)	1.837	-	3.92
Sand equivalent (visual)	(%)	99.56	-	-
Sand equivalent (piston)	(%)	85.97	-	-
Apparent density	(g/cm³)	1.46	1.09	0.40
Absolute density	(g/cm³)	2.11	3.11	0.94
BSS	(cm²/g)	-	3371	-

Valuation of Rubber Waste and Dune Sand: mortar for construction and environmental protection

Article Category: Original Scientific Article

Published Online: Sep 04, 2023

Page range: 79 - 89

Received: Jun 11, 2021

Accepted: Jun 30, 2021

DOI: https://doi.org/10.2478/rmzmag-2021-0007

© 2021 Assia Aidoud et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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Effect of rubber on the physico-mechanical properties of the mortars studied

Chemical compositions of cement and dune sand

Composition of the mortars studied

General material properties