Mineralogy as a Key Parameter for Strength Evaluation of Clayey Subgrades

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Naveed Ahmad
Yawar Rasheed
Usama Saleem
Afaq Ahmad
Faheem Butt
Muhammad Safdar
Shaheera Sharib


The current pavement design practices do not take into consideration the mineralogy of clays. It was also recommended by researchers in the recent past that current standards should be revised and should take into consideration the clay mineralogy. The major task of this research was to study the soils of same type according to AASHTO classification system, but having different quantities of clay minerals, so the behavior of different quantities of clay minerals on the strength properties of soil can be accessed. During this research, three soils were collected from different sources and having different percentages of clay minerals were studied. Soils were collected from three different regions of Pakistan, Kohat (Soil-A), Islamabad (Soil-B) and Faisalabad (Soil-C). Various classification and strength tests, like Sieve Analysis & Hydrometer Analysis (ASTM D-422), Liquid Limit & Plastic Limit (ASTM D-4318), X-Ray Diffraction Analysis, Modified Proctor Test (AASHTO T 180 B) and California Bearing Ratio Tests (un-soaked condition & soaked condition) were performed and relationship of clay mineral quantity with CBR (Un-Soaked & Soaked conditions) and swelling potential was established. A comparison has also been made between the percentage of clay obtained by X-Ray diffraction analysis and Hydrometer analysis.
Keywords: Mineralogy, Clay, Subgrade, California Bearing Ratio, Hydrometer analysis

Article Details

How to Cite
Ahmad, N., Rasheed, Y., Saleem, U., Ahmad, A., Butt, F., Safdar, M., & Sharib, S. (2021). Mineralogy as a Key Parameter for Strength Evaluation of Clayey Subgrades. Technical Journal, 26(3), 18-24. Retrieved from https://tj.uettaxila.edu.pk/index.php/technical-journal/article/view/1588
Author Biographies

Yawar Rasheed, UET Taxila

Student, CED

Usama Saleem, National University of Modern Languages, Rawalpindi

Cicil Engineering Department

Afaq Ahmad, University of Engineering and Technology, Taxila

Associate Professor, Civil Engineering Department

Faheem Butt, University of Engineering and Technology, Taxila

Assistant Professor, Civil Engineering Department

Muhammad Safdar, University of Engineering and Technology, Peshawar, Pakistan

Assistant Professor, Earthquake Engineering Center, Depertment of Civil Engineering

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