COMPACTION AND CONSOLIDATION BEHAVIOUR OF FLY ASH AND POND ASH FOR STOWING IN UNDERGROUND MINES

8th International Scientific Conference - SGEM2008, www.sgem.org, SGEM2008 Conference Proceedings/ ISBN: 954-918181-2, June 16-20, 2008, Vol. 1, 621-628 pp

ABSTRACT

This paper presents the outcome of the study on the compaction and consolidation
behaviour of class F fly ash of Talcher Thermal Power Station (TTPS)of India for
stowing in the underground mines. Light weight compaction test is conducted by using
Proctor mold as per IS: 2720 to determine the optimum moisture content and dry
density of fly ash and pond ash samples. From the compaction test it is found that the
optimum moisture content of fly ash is 34.25% at a maximum dry density of 1.15
g/cm3. Similarly, the optimum moisture content of pond ash is found out 34.97% at a
maximum dry density of 1.09 g/cm3. One dimensional consolidation test of the
compacted fly ash and pond ash samples is conducted using a fixed ring consolidomer
as per Indian Standard IS: 2720 (Part 15) confirming ASTM D2435. From the
consolidation test it is found that the pond ash samples shows a higher coefficient of
consolidation (Cv) values and therefore, undergoes a faster rate of settlement as
compared to the fly ash samples. This represents, the pond ash possesses a better load
bearing characteristic as compared to the fly ash and more suitable for stowing.

Keywords: Fly ash, pond ash, compaction, consolidation, underground mines