Development of Fire Resistant Grout Pack Material for Combating Mine Fire

A fire resistant grout pack material having almost zero air permeability and higher compressive strength than cement based material has been developed. It consists of a mix of Magnesium Oxide and Magnesium Chloride in equal proportion with flyash and sand in the ratio of 1:0.33: 1.5. It would be useful for consolidating crushed coal massive for preventing spontaneous heating and also as a cheap fill material for remote sealing to deal with long standing fires.