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Year : 2017  |  Volume : 2  |  Issue : 2  |  Page : 37-44

Negative aging of granular materials

Department of Civil Engineering, College of Engineering, Al Imam Mohammad Ibn Saud Islamic University, Riyadh, Saudi Arabia

Correspondence Address:
Dr. Mubashir Aziz
Department of Civil Engineering, College of Engineering, Al Imam Mohammad Ibn Saud Islamic University, Riyadh 11432
Saudi Arabia
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ijas.ijas_5_18

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Background: Use of abundantly available soft rocks for embankment construction is continuously increasing due to economic reasons. A detailed knowledge on time-dependent deterioration (negative aging) of such weak geomaterial becomes essential for better serviceability of geotechnical structures. Methodology: To explore possible effects of deterioration of soil grains on mechanical properties, a series of consolidated drained torsional shear tests were performed under saturated and dry conditions on crushed soft rocks from Japan and Pakistan. Results: Test results indicated that soils under dry conditions with intact grains exhibited stiffer stress-strain behavior, higher peak stress ratios, and strain softening response after peak shear stress. On the contrary, soils undergoing water-induced deterioration of grain showed enormous loss of strength upon submergence. Mohr-Coulomb failure envelopes elucidated large effects of saturation-induced disintegration of grains on effective angle of internal friction. In addition, peak strength parameters seemed to be relatively more vulnerable to saturated conditions as compared to residual strengths. Conclusion: It is concluded that the observed soil behavior can be crucial to embankments and structural foundations constructed on granular materials obtained from crushed soft rocks.

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