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Characterization of Hydro-Mechanical Effects of Suction and Clay Minerals on Resilient Modulus, Mr

  • Aneke Frank IkechukwuEmail author
  • Mostafa M. Hassan
  • A. Moubarak
Conference paper
Part of the Sustainable Civil Infrastructures book series (SUCI)

Abstract

Pavement should be adequately design to sustain repeated load and evenly transfer this load to the subgrade. The response of pavement structure depends on the durability of the subgrade soil, which can be increased through stabilization and compaction, in order to achieve desirable pavement foundation. However, design parameters such as resilient modulus (Mr) is commonly used by design engineers in design of pavement structure. Mr is an important property for mechanistic analysis of pavement response under traffic loading. This study investigated possible effects of clay minerals and matric suction (ua – uw) on Mr of three selected Free State Subgrades (FSS). To achieve this objective, three subgrade soils representing typical FSS were selected and tested in the laboratory for Mr. Other basic civil engineering tests were conducted on the soils to determine their geotechnical properties. The specimens were prepared compacted and tested at varying moisture contents and dry densities before and after the addition of 4% and 6% bentonite, and 4% and 6% kaolinite using repeated load triaxial test (RLTT) machine and filter paper in the laboratory. Based on experimental results, Mr exhibited a hysteric loop with moisture variations. The Mr values increases with increase in matric suction on the dry path and the increase varies from one soil to another. The results further revealed that a good bilinear relationship found between Mr – (ua – uw) with a linearity coefficient (R2) of 0.7705.

Notes

Acknowledgment

The Authors will like to acknowledge Geotechnical and Pavement Material laboratories at CSIR for providing the required testing equipment and the entire researchers at Sustainable Urban Road Transportation (SURT) Research Group.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Aneke Frank Ikechukwu
    • 1
    Email author
  • Mostafa M. Hassan
    • 1
  • A. Moubarak
    • 2
  1. 1.Sustainable Urban Road Transportation (SURT) Research Group, Department of Civil Engineering and Information TechnologyCentral University of TechnologyBloemfonteinRepublic of South Africa
  2. 2.Department of Civil EngineeringSuez Canal UniversityIsmailiaEgypt

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