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Research Article
Leta Gudissa
Addis Ababa Science and Technology University
Corresponding Author
ORCiD: https://orcid.org/0000-0003-2549-7503
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Declarations:
Declarations
- The author has confirmed that a statement listing potential conflicts of interest or lack thereof is included in the text.
Road construction requires a prime quality and a tremendous amount of aggregates, within which their quality is set by geological and geotechnical properties. Therefore, the Mesozoic limestone was studied in the vicinity of Harer and Dire Dawa towns, for the fundamental engineering assessments.
Thirty-seven Mesozoic limestone samples obtained from the area were subjected to petrographic and geotechnical analyses to work out the suitability of the rock as a road aggregate. Physical properties were investigated using ultrasonic pulse velocity (UPV), water absorption, Na2So4 soundness, and specific gravity tests. However, the mechanical properties were determined using unconfined compressive strength (UCS), Aggregate crushing value (ACV), Aggregate Impact Value (AIV), and Los Angles Abrasion value (LAAV).
The study aimed to see if the limestone aggregate complies with the globally accepted standards by employing geotechnical laboratory analyses and petrographic examination.
The petrographic observations reveal the Mesozoic limestones of the area are dominantly composed of micrite, sparite, and bioclasts with subordinate intraclasts, ooids, Fe-oxides, and dolomites. Results of the physical properties show the rock has a mean UPV of 4859 m/s, a dry specific gravity of 2.64, and very low water absorption ranging from 0.2-5.7%, and Na2So4 soundness ranges from 1-14%. Among the mechanical properties, UCS, AIV, ACV, and LAAV range from 20.5-180.5Mpa, 8-20%, 24-34%, and 18.9-31.1%, respectively.
Based on the aforementioned results, the limestones of the area are suitable for aggregate in road construction as they’re complying with ERA, AASHTO, ASTM, and BS standards used for pavement works.
Keywords
Suitability, Limestone, Pavement, Aggregate Crushing Value, Aggregate Impact Value
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
This is a list of supplementary files associated with this preprint. Click to download.
- Fig.812.jpg
Plates 1-2. The photomicrographs of (1) ML-29 (M=Medium grained micritic groundmass, long stick-like bi-valves (white arrows)), (2) sample #17 (Fe-oxides along the pressure solution seam (white arrow), M=Fine grained micritic groundmass)
- Fig.834.jpg
Plates 3-4. The photomicrographs of (3) sample CL-90, (4) sample #72
- Fig.856.jpg
Plates 5-6. The photomicrographs of (5) sample ML-28, and (6) sample 86
- Fig.878.jpg
Plates 7-8. The photomicrographs of (7) ML-24 with rhombohedral dolomite crystals (white arrows) and D (dolomite) (8) fossiliferous micritic limestone of sample #70 with dominant pressure solution and oxidation along the pressure solution seam (yellow arrow) F-Foraminifera, B-Bryozoans, C-Calcispheres.
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A new preprint design is coming!
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This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Research Article
Leta Gudissa
Addis Ababa Science and Technology University
Corresponding Author
ORCiD: https://orcid.org/0000-0003-2549-7503
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 19 Jan, 2021
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Geology
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Declarations:
Declarations
- The author has confirmed that a statement listing potential conflicts of interest or lack thereof is included in the text.
Road construction requires a prime quality and a tremendous amount of aggregates, within which their quality is set by geological and geotechnical properties. Therefore, the Mesozoic limestone was studied in the vicinity of Harer and Dire Dawa towns, for the fundamental engineering assessments.
Thirty-seven Mesozoic limestone samples obtained from the area were subjected to petrographic and geotechnical analyses to work out the suitability of the rock as a road aggregate. Physical properties were investigated using ultrasonic pulse velocity (UPV), water absorption, Na2So4 soundness, and specific gravity tests. However, the mechanical properties were determined using unconfined compressive strength (UCS), Aggregate crushing value (ACV), Aggregate Impact Value (AIV), and Los Angles Abrasion value (LAAV).
The study aimed to see if the limestone aggregate complies with the globally accepted standards by employing geotechnical laboratory analyses and petrographic examination.
The petrographic observations reveal the Mesozoic limestones of the area are dominantly composed of micrite, sparite, and bioclasts with subordinate intraclasts, ooids, Fe-oxides, and dolomites. Results of the physical properties show the rock has a mean UPV of 4859 m/s, a dry specific gravity of 2.64, and very low water absorption ranging from 0.2-5.7%, and Na2So4 soundness ranges from 1-14%. Among the mechanical properties, UCS, AIV, ACV, and LAAV range from 20.5-180.5Mpa, 8-20%, 24-34%, and 18.9-31.1%, respectively.
Based on the aforementioned results, the limestones of the area are suitable for aggregate in road construction as they’re complying with ERA, AASHTO, ASTM, and BS standards used for pavement works.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
This is a list of supplementary files associated with this preprint. Click to download.
- Fig.812.jpg
Plates 1-2. The photomicrographs of (1) ML-29 (M=Medium grained micritic groundmass, long stick-like bi-valves (white arrows)), (2) sample #17 (Fe-oxides along the pressure solution seam (white arrow), M=Fine grained micritic groundmass)
- Fig.834.jpg
Plates 3-4. The photomicrographs of (3) sample CL-90, (4) sample #72
- Fig.856.jpg
Plates 5-6. The photomicrographs of (5) sample ML-28, and (6) sample 86
- Fig.878.jpg
Plates 7-8. The photomicrographs of (7) ML-24 with rhombohedral dolomite crystals (white arrows) and D (dolomite) (8) fossiliferous micritic limestone of sample #70 with dominant pressure solution and oxidation along the pressure solution seam (yellow arrow) F-Foraminifera, B-Bryozoans, C-Calcispheres.
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