Evaluation of Physical Properties of Clays Mixed with Silica Sand
A. Akbar Firoozi, M.R. Taha, A. Asghar Firoozi, Tanveer A. Khan
Corresponding author (email) : a.firoozi@gmail.com
Abstract
This study examined the effects of heat treatment on two types of clays mixed with silica sand under laboratory conditions. Soils were subjected to three varied temperatures, i.e. 100, 250 and 500°C. The soil properties studied were Atterberg’slimits, optimum water content and unconfined compressive strength. Experimental results showed that the temperature greater than 100°C resulted in a reduction in Atterberg’s limits, optimum water content and unconfined compressive strength.For illite and silica mixture heating the soils at 500°C, liquid limit, plastic limit, optimum water content and unconfined compressive strength were reduced to 12%, 0%, 40% and 0%, and for kaolinite and silica mixture the above characteristics reduced to 18%, 0%, 50% and 0% respectively when matched to soil specimen’s properties at ambient temperature. Where as maximum dry density for illite and kaolinite increased by 5% and 8% respectively for the two clays.
Keywords : Clay; heat treatment; Atterberg limits; optimum water content; unconfi ned compressive strength
Abstrak
Kajian ini mengkaji rawatan kesan dari rawatan haba ke atas dua jenis tanah liat dicampur dengan pasir silika di bawah keadaan makmal. Tanah melalui tiga suhu berbeza, iaitu 100, 250 dan 500°C. Sifat tanah yang dikaji ialah had Atterberg, kandungan air optimum dan kekuatan mampatan bebas. Hasil eksperimen menunjukkan bahawa suhu melebihi 100C mengakibatkan satu penurunan di dalam had Atterberg, kandungan air optimum dan kekuatan mampatan bebas. Untuk campuran ilit dan silica, memanaskan tanah pada suhu 500°C menyebabkan had cecair, had plastik, kandungan air optimum dan kekuatan mampatan bebas dikurangkan kepada 12%, 0%, 40% dan 0%, dan untuk campuran kaolinit dansilica, ciri-ciri di atas mengurang kepada 18%, 0%, 50% dan 0% masing-masing apabila dipadankan dengan ciri-ciri spesimen tanah di suhu ambien. Manakala ketumpatan kering maksimum untuk ilit dan kaolinit dinaikkan sebanyak 5%dan 8% masing-masing untuk dua tanah liat ini.
Kata kunci: Tanah liat; rawatan haba; Had Atterberg; kandungan air optimum; kekuatan mampatan bebas