Application of coal fly ash in pavement subgrade stabilisation: A review.
Class C
Class F
Clay
Expansive soil
Fly ash
Pavement
Stabilisation
Subgrade
Journal
Journal of environmental management
ISSN: 1095-8630
Titre abrégé: J Environ Manage
Pays: England
ID NLM: 0401664
Informations de publication
Date de publication:
15 Jun 2022
15 Jun 2022
Historique:
received:
09
11
2021
revised:
14
03
2022
accepted:
17
03
2022
pubmed:
2
4
2022
medline:
19
4
2022
entrez:
1
4
2022
Statut:
ppublish
Résumé
Expansive clays are found in many countries worldwide, and they exhibit inherent volume change during the seasonal moisture variation causing cracks, heaves, and damages to the overlying pavements. Chemical stabilisation is one of the most used approaches to treat the expansive clay subgrades. Cement, Lime and Fly ash are the most commonly used stabilisers, in which fly is cheaper and a by-product obtained from the coal power plant. This paper reviews fly ash stabilisation on various clay types, including low plasticity clays, high plasticity clays, silty clays, organic clays, and peats. The review begins with the properties of fly ash, followed by the characteristics of fly ash stabilised subgrades. The micro-level mechanism, physical, mechanical, and hydraulic characteristics of stabilised pavements are presented graphically for the Class C, and F fly ashes. The micro-level studies reveal that the pozzolanic reaction is stronger than the cation exchange during the fly ash stabilisation. The unconfined compressive strength (UCS), California bearing ratio (CBR) and resilient modulus (M
Identifiants
pubmed: 35364515
pii: S0301-4797(22)00499-6
doi: 10.1016/j.jenvman.2022.114926
pii:
doi:
Substances chimiques
Coal
0
Coal Ash
0
Metals, Heavy
0
Soil
0
Clay
T1FAD4SS2M
Types de publication
Journal Article
Review
Langues
eng
Sous-ensembles de citation
IM
Pagination
114926Informations de copyright
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