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Title: Evaluation of Performance of Backfilling Mortar for Repairing Sewage Pipes

Author(s): Ken Ogasawara, Hiromi Fujiwara, and Masanori Maruoka

Publication: Symposium Paper

Volume: 326


Appears on pages(s): 103.1-103.10

Keywords: backfill mortar, compressive strength, mortar flow, mortar density, sewer pipeline, repair method

DOI: 10.14359/51711086

Date: 8/10/2018


This paper reports on the research developing the backfill mortar used for repairing construction of deteriorated concrete structures, such as sewage pipelines. The mortar should have high strength to satisfy the demand of pipe rigidity. And high filling ability is necessary to fill the unevenness on the renewal pipe surface. Also, low density of mortar can improve the work efficiency. Accordingly, the target values were that the compressive strength was 45.0 N/mm2 (940000 psf) or more at 28 days, the mortar flow was 250 ± 20 mm (10±0.79 in.), and the density was 1.70 ± 0.15 g/cm3(110±10 lb/ft3). The applicability of this backfill mortar to repair work was studied.