Strength and durability characteristics of lime fly ash-stabilized recycled concrete aggregate for use in low-volume rural roads
By: Shravan Kumar, G
.
Contributor(s): Shankar, S.
Publisher: USA Springer 2023Edition: Vol.53(1), Feb.Description: 78-92p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian geotechnical journalSummary: The present work examines the behavior of lime fly ash-treated recycled concrete aggregate (LFRCA) as a base course material for low-volume rural roads (LVRRs). The recycled concrete aggregate (RCA) material was stabilized with 10%, 15% and 20% LFA content with a lime-to-fly ash ratio of 1:2. Mechanical tests were carried out to determine the unconfined compressive strength (UCS), indirect diametrical tensile strength (IDTS) and durability. Microstructural analysis was also done using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and X-ray diffraction to confirm the stabilization process. The micro-level characteristics' findings attributed to the pozzolanic reaction between lime and fly ash. The test results demonstrated that adding 10–15% LFA content is sufficient to meet the strength and durability requirements of 3 MPa for stabilizing RCA. Finally, the pavement design was carried out using lime fly ash-stabilized recycled concrete aggregate (LFRCA) as a base course material, and the strains were determined using IIT PAVE software. The design and analysis indicated that the pavement with 215–250 mm thickness of LFRCA as the base layer for different traffic and subgrade conditions meets fatigue and rutting performance criteria. It has been noticed that the pavement thickness with LFRCA is comparable to that of pavement thickness with cement-stabilized base. This study provides an approach to the sustainable use of RCA and FA in pavement applications.
| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
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Articles Abstract Database
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2023-1316 |
The present work examines the behavior of lime fly ash-treated recycled concrete aggregate (LFRCA) as a base course material for low-volume rural roads (LVRRs). The recycled concrete aggregate (RCA) material was stabilized with 10%, 15% and 20% LFA content with a lime-to-fly ash ratio of 1:2. Mechanical tests were carried out to determine the unconfined compressive strength (UCS), indirect diametrical tensile strength (IDTS) and durability. Microstructural analysis was also done using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and X-ray diffraction to confirm the stabilization process. The micro-level characteristics' findings attributed to the pozzolanic reaction between lime and fly ash. The test results demonstrated that adding 10–15% LFA content is sufficient to meet the strength and durability requirements of 3 MPa for stabilizing RCA. Finally, the pavement design was carried out using lime fly ash-stabilized recycled concrete aggregate (LFRCA) as a base course material, and the strains were determined using IIT PAVE software. The design and analysis indicated that the pavement with 215–250 mm thickness of LFRCA as the base layer for different traffic and subgrade conditions meets fatigue and rutting performance criteria. It has been noticed that the pavement thickness with LFRCA is comparable to that of pavement thickness with cement-stabilized base. This study provides an approach to the sustainable use of RCA and FA in pavement applications.
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