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American Journal of Innovative Research & Applied Sciences
| ISSN: 2429-5396 (e) | www.american-jiras.com | |
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| | ARTICLES | Am. J. innov. res. appl. sci. Volume 6, Issue 3, Pages 131-152 (March 2018) |
| Review Article |
American Journal of innovative
Research & Applied Sciences
Research & Applied Sciences
ISSN 2429-5396 (Online)
OCLC Number: 920041286
OCLC Number: 920041286
|
| MARCH VOLUME 6 | N° 3 | 2018 |
Authors Contact
* Correspondant author and authors Copyright © 2018:
| Dima, Ali Nabhan Salameh * | Wael, Housain Harfoush | and | Rami, Ahmad Ousta |
* Correspondant author and authors Copyright © 2018:
| Dima, Ali Nabhan Salameh * | Wael, Housain Harfoush | and | Rami, Ahmad Ousta |
Affiliation.
Tishreen University | Department of Geotechnical Engineering | Latakia| Syria |
Tishreen University | Department of Geotechnical Engineering | Latakia| Syria |
This article is made freely available as part of this journal's Open Access: ID | Dima-ManuscriptRef.1-ajira180318 |
ABSTRACT
Background: Generated temperature within waste mass is one of the most important factors affecting the performance of insulation systems in landfills. This is due to temperature effect on properties of the material used in lining and particularly permeability and strength. Sand-wax mixtures possess good impermeability, enable it to isolate wastes in landfills and prevent soil and groundwater from contamination caused by landfill's leachate. Objectives: This study aims to investigate the thermal effect on permeability and compressive strength of compacted sand-wax mixtures, to evaluate the feasibility of using it as a construction material yielding the required impermeability and strength for bottom barriers in landfills during its lifetime. Methods: A series of compaction, permeability and unconfined compression strength tests was carried out at different water temperatures similar to that observed near the bottom barrier in landfill. Samples were prepared by mixing poorly graded sand with various ratios of wax by weight, and compacted at four compaction efforts (reduced, standard, intermediate and modified).Results: Results of this study indicated that, increasing of temperature causes decrease in both permeability and strength for all samples of wax-coated sands. The minimum ratios of wax which achieving the required permeability at considered temperatures were: 9% for modified and intermediate efforts, 11% for standard and 13% for the reduced. Furthermore, at the temperature of 40⁰C, samples with all wax contents showed an acceptable permeability, whereas samples with the optimum wax content became impermeable. On the other hand, all tested samples showed higher compressive strength than the required strength in lining landfills. Conclusions: The study reveals that, sandy soil improved by wax possess the required impermeability and strength in lining landfill with consideration of the thermal effect .Thus it can be used effectively as an alternative landfill barrier material.
Keywords: wax, sand, temperature, permeability, unconfined compressive strength, barriers.
Background: Generated temperature within waste mass is one of the most important factors affecting the performance of insulation systems in landfills. This is due to temperature effect on properties of the material used in lining and particularly permeability and strength. Sand-wax mixtures possess good impermeability, enable it to isolate wastes in landfills and prevent soil and groundwater from contamination caused by landfill's leachate. Objectives: This study aims to investigate the thermal effect on permeability and compressive strength of compacted sand-wax mixtures, to evaluate the feasibility of using it as a construction material yielding the required impermeability and strength for bottom barriers in landfills during its lifetime. Methods: A series of compaction, permeability and unconfined compression strength tests was carried out at different water temperatures similar to that observed near the bottom barrier in landfill. Samples were prepared by mixing poorly graded sand with various ratios of wax by weight, and compacted at four compaction efforts (reduced, standard, intermediate and modified).Results: Results of this study indicated that, increasing of temperature causes decrease in both permeability and strength for all samples of wax-coated sands. The minimum ratios of wax which achieving the required permeability at considered temperatures were: 9% for modified and intermediate efforts, 11% for standard and 13% for the reduced. Furthermore, at the temperature of 40⁰C, samples with all wax contents showed an acceptable permeability, whereas samples with the optimum wax content became impermeable. On the other hand, all tested samples showed higher compressive strength than the required strength in lining landfills. Conclusions: The study reveals that, sandy soil improved by wax possess the required impermeability and strength in lining landfill with consideration of the thermal effect .Thus it can be used effectively as an alternative landfill barrier material.
Keywords: wax, sand, temperature, permeability, unconfined compressive strength, barriers.
THERMAL EFFECT ON PERMEABILITY AND STRENGTH OF SAND-WAX MIXTURES USED IN LINING LANDFILLS
| Dima, Ali Nabhan Salameh | Wael, Housain Harfoush | and | Rami, Ahmad Ousta |. Am. J. innov. res. appl. sci. 2018; 6(3):131-152.
| PDF FULL TEXT | | Received | 22 February 2018 | | Accepted | 27 March February 2018 | | Published 30 March 2018 |
| Dima, Ali Nabhan Salameh | Wael, Housain Harfoush | and | Rami, Ahmad Ousta |. Am. J. innov. res. appl. sci. 2018; 6(3):131-152.
| PDF FULL TEXT | | Received | 22 February 2018 | | Accepted | 27 March February 2018 | | Published 30 March 2018 |