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Summer Research Fellowship Programme of India's Science Academies

Brazilian Test on Contact Bound Cohesive Frictional Granular Material

Shreya Gupta

Department of Civil Engineering, National Institute of Technology Karnataka, Srinivasnagar PO, Surathkal, Mangalore, 575025, Karnataka, India.

Dr. Tejas G. Murthy

Associate Professor, Department of Civil Engineering, Indian Institute of Sciences Bengaluru, CV Raman Rd, Bengaluru, Karnataka, 560012

ABSTRACT

In nature, cohesive frictional granular material exist in three broad categories of configurations: contact bound structure, matrix bound structure, and void bound structure depending on their relative amount of binder content, and the rate and order of deposition. These material configurations can be prepared in laboratory with varying binder content. Typical examples of matrix and void bound material are rocks, concrete, etc. Materials with matrix bound structure are studied thoroughly in literature but studies on contact bound cohesive frictional granular materials (with low amount of binder e.g. soils found in coastal areas with low cementation due to precipitation of organic matter at the contacts) are few and far between. In this study, we perform the Brazilian test to understand the scaling behaviour of contact bound cohesive frictional granular materials. To study dimensional scaling we use 4 different sizes of specimen i.e 6mm×12mm , 12mm×24mm, 24mm×48mm, 48mm×96mm (thickness×diameter). To study particle size scaling we use 0.25mm, 0.5mm size of particle with mould dimensions 6mm×12mm,12mm×24mm, 24mm×48mm, 48mm×96mm (thickness×diameter).

Keywords: Brazilian Test, Granular Material, Scaling Effect, Continuum Mechanism, Entanglement, Quasi Brittle Material.

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