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- Title
Mineralogy as a Key Paremeter for Strength Evaluation of Clayey Subgrades.
- Authors
Ahmad, N.; Rasheed, Y.; Saleem, U.; Ahmad, A.; Butt, F.; Safdar, M.; Sharib, S.
- Abstract
The current pavement design practices do not take into consideration the mineralogy of clays. The major task of this research was to study the effect of clay content on strength characteristics of soils belonging to same group i.e., A-4, as classified by American Association of State Highway and Transportation Officials (ASHTO). Samples were collected from three different areas of Punjab. Various classification, compaction and strength tests as required for pavement subgrades were performed following American Society for Testing Materials (ASTM) standards. X-Ray diffraction analysis was also performed to support data obtained from hydrometer analysis for determination of clay content. It was observed that clay content has a major role in controlling index properties, swelling potential and strength characteristics for fine-grained soils. With increase in clay content, plasticity index and swelling potential of the soil were increased, while a decrease was observed in soaked and unsoaked California Bearing Ratio (CBR) values. Hence mineralogy should also be given due importance while selecting subgrade soil.
- Subjects
PUNJAB; AMERICAN Association of State Highway &; Transportation Officials; MINERALOGY; PAVEMENT subgrades; SWELLING soils; MATERIALS testing; X-ray diffraction
- Publication
Technical Journal of University of Engineering & Technology Taxila, 2021, Vol 26, Issue 3, p18
- ISSN
1813-1786
- Publication type
Article