STUDY ON APPLICICABILITY OF LOW-DENSITY AND HIGH-STRENGTH BACKFILL MORTOR USED IN SEWER PIPELINES REPAIR METHOD

Abstract

The sewage pipes are getting old so the sewer pipe rehabilitation method attracts attention. The performances required for the backfilling mortar used in this rehabilitation method are low density to prevent floating up of inner resin pipe, no segregation to keep homogenization of backfill mortar, high strength to achieve necessary strength of repaired pipe and able to be filled in narrow gap with low pressure is required. In the case of binder C used in this paper, there was a problem that the pumping pressure became high. For this reason, in the case of binder D, by increasing the standard value of mortar flow value, it was possible to reduce the pumping pressure and satisfy the required performances. However, the anti-washout under water became low and it is necessary to study further in the future.