Abstract: The composition of coal gangue powder in Liupanshui mining area was analyzed and the strengths property of original and activated coal gangue based unfired brick were determined. The effects of mechanical, thermal, chemical and compound activation on the coal gangue were systematically studied. The results showed that coal gangue has the characteristics of high silicon content, high iron content in Liupanshui mining area. Activated coal gangue can improve considerably the strengths property unfired brick. The compound activation method is superior to the single activation method. Compound activated coal gangue can enhanced sharply the strengths property of unfired brick , then unfired brick fully meets the standard of JC/T422-91 (96) MU15.

Key words: activated coal gangue;unfired brick;cementing performance