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Large-size lump (e.g., coal reject or waste rocks) is one of the most popular backfill materials for underground mines attributed to its cost-effective and easy-to-obtain. The massive void between lumps, however, does generally affect the overall performance in eliminating the ground subsidence. This paper presents a conceptual backfill material, termed as lump-grout (LG) material, the attractive feature of which is that the voids between lumps are totally filled up with high-water content cementitious grout (CG) material. To explore the mechanical behaviour of LG material, a total of 36 LG sp...

Then our material biodegrade into c02 in the water and biomass. into c02 in the water and biomass-— into c02 in the water and biomass. , .. , , biomass. ingredients can be put throu~h biomass. ingredients can be put through existing _ biomass. ingredients can be put through existing moulding - through existing moulding machines. the material would struggle with housing hazardous chemicals though and its end—of—life is proving problematic. it end-of-life is proving problematic.- end-of-life is proving problematic. it can be mechanically - problematic. it can be mechanically or - problemat...