| abstract |
(57) [Summary] [Purpose] Backfilling that uses a fly ash type auxiliary material as a strength auxiliary material, has high density, high strength and good filling properties, and is durable even when a water glass type coagulant is used. Use as injection material. [Structure] Cement-based hardening material, fly ash-based auxiliary material, cellulose-based additive, dispersion retarder and water are kneaded in a predetermined ratio, and solution A and coagulant B solution made of sodium silicate are approximately 10 parts. Backfill injection material compounded in a volume ratio of 1: 1. [Effect] It is possible to provide a backfill injection material that has high density, high strength, and good filling properties and that has good durability even when a water glass-based coagulant is used. Therefore, in tunnel construction, It has the effect of reliably controlling the loosening of the ground and preventing the subsidence of the ground. |