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Portland cement is the traditional filling materials used in China and features high cost, long maintenance cycle of filling body, and complicated process flow due to the use of thickening equipment and the addition of coarse aggregates to prepare paste slurry in complex production process (Yang et al., 2014). In order to solve those technical issues, the solid waste preparation of quick-setting materials and the semi-industrial test of filling mining technology were carried out in Guizhou ChanHen. The test used solid waste and additives as the main raw materials and is simple in the preparation process of slurry. The prepared paste does not become layered, segregated or blended and instead has excellent performance that is suitable for long distance pipeline transportation. The test also improved the strength of the filling body and made its strength range adjustable as well. For instance, the compressive strength of samples maintained for 3 days can reach 6~9 MPa due to the excellent durability and resistance to weathering carbonization and harsh environment. Most importantly, the cost of the filling material is reduced, only 1/20 of that of the cement-based filling technology (Du et al., 2012). The test shows that great economic and social benefits could be produced if large-scale production could take place in China.

Low cost and high strength paste filling material with solid waste