The slag and fly ash-bottom ash were used as precursors.The fly ash and bottom ash were co-ground to prepare one of the precursors.The solid activator with a modulus of 1.2 was prepared by NaOH and Na2SiO3,and the alkali-activated grouting material was prepared.The effects of fly ash-bottom ash content and activator content(Na2O)on the working performance and mechanical properties of grouting materials were studied.The hydration products were characterized by scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The pore structure characteristics of grouting materials were analyzed by nuclear magnetic resonance(NMR).The results show that the 28 d maximum compressive strength of grouting material with 50% fly ash-bottom ash content is 31.25 MPa.The hydration products are mainly C-A-S-H gel.The internal pores of the slurry stone body are mainly gel pores(<10 nm)and transition pores([10-100)nm),accounting for more than 90% .
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