Abstract: The mechanical properties of spontaneous combustion coal gangue's bonding material was researched by physical and chemical activation method.The research is based upon checking the element property of spontaneous combustion coal gangue in Gaode Mine,Fuxin city of Liaoning Province. The physical research showed that this coal gangue has good grindability;the orthogonal test on the bonding material which take the spontaneous combustion coal gangue as the primary material analysis the influence of powdered ore,calcium oxide,dihydrate gypsum and sodium silicate's content on bonding material's strength. Chemical research showed that spontaneous combustion coal gangue can still make C42.5 cement with high content (74%) under the interaction of compound activation. According to analysis of variance results, we are able to determine the optimum mix proportion of bonding material which can provide useful technical reference to exploit geopolymer cement from spontaneous combustion coal gangue.

Key words: spontaneous combustion coal gangue%bonding material%activation%strength of cement mortar%orthogonal design