Warta Geologi, Volume 46, No. 1, April 2020, pp 1-5





Description

Slake durability indices of fresh shales and sandstone from the Gemas Formation, Ayer Hitam, Johor Darul Takzim

John Kuna Raj

No. 83, Jalan Burhanuddin Helmi 2,
Taman Tun Dr. Ismail, 60000 Kuala Lumpur, Malaysia
Email address: jkr.ttdi.tmc@gmail.com

Abstract: At the slope cut between km 81.30 and 81.05 (southbound) of the North-South Highway near Ayer Hitam are exposed dark grey to black, fresh (unaltered) shales and fine grained sandstones of the Middle to Upper Triassic Gemas Formation. The strata with bed thicknesses of between 0.2 and 1.5 m, strike about 165o and dip eastward at 35o to 43o. The shales have an average dry unit weight of 24.85 kN/m3 and an average apparent porosity of 5.9%, whilst the sandstone has an average dry unit weight of 24.83 kN/m3 and an average apparent porosity of 4.8%. Slake durability indices (Id2) of the shales for two standard cycles of wetting and drying are between 99.1% and 99.6%, whilst indices (Id4) for four cycles are between 99.0% and 99.5%. Slake durability indices (Id2) of the sandstone for two standard cycles of wetting and drying are between 99.2% and 99.3%, and for four cycles (Id4) between 98.4% and 98.5%. It is concluded that the fresh (unaltered) shales and sandstone are of “extremely high durability” and suitable for use as highway embankment or construction material (rock fill).

Keywords: slake durability indices, Gemas Formation

DOI : https://doi.org/10.7186/wg461202001