Chaowarin Walsri, Tanaphol Sriapai, Decho Phueakphum, and Kittitep Fuenkajorn

pp. 587 - 596

Abstract

Large-scale slake durability index tests have been performed on Khok Kruat (KK), Phu Kradung (PK) and Phra Wihan
(PW) sandstone. A rotating drum with a diameter of 64 cm and length of 40 cm was fabricated to accommodate ten rock
fragments with a nominal size of 10 cm. Both large-scale and standard-testing were performed under dry and wet conditions.
The large-scale test yields rock deterioration twice greater than the small-scale test, primarily due to the greater energy
imposed on the rock fragments. The weight losses under wet condition are 12%, 8%, and 3% greater than under dry condition for KK, PK, and PW sandstones, respectively. After 10 test cycles the water absorption values for PW, KK and PK
sandstones are 12%, 3%, and 2%, respectively. Rock degradation under the rapid cooling-heating cycles in the laboratory is
about 18 times faster than under the field condition in the northeast of Thailand.