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Properties of Fly Ash-Cement Cellular Grouts for Sliplining and Backfill Applications
Cellular grouts are being used in various construction and repair applications because of their light weight, ease of placement and good specific strength properties. Hence, there is increased interest in better characterizing these materials, especially with less cement in the mix. Cellular grouts with fly ash (Class C) as a replacement for cement are characterized in this study based on their setting time, compressive properties, shrinkage and water absorption. Field samples were collected with unit weights in the range of 6.8 kN/m3 (43 pcf) and 8.6 kN/m3 (55 pcf) for this investigation. The effect of using 50% fly ash (Class C) as cement replacement was investigated. The addition of fly ash increased the initial setting time and reduced the compressive strength and modulus of the 8.5 kN/m3 (54 pcf) cellular grout but had a lesser effect on the 6.8 kN/m3 (43 pcf) grout. The addition of fly ash reduced the shrinkage of the grout. The compressive strength and modulus of grouts increased with unit weight of grouts and curing time. Cellular grouts showed varying amounts of water absorption, being dependent on the initial unit weight of the grout.
Properties of Fly Ash-Cement Cellular Grouts for Sliplining and Backfill Applications
Cellular grouts are being used in various construction and repair applications because of their light weight, ease of placement and good specific strength properties. Hence, there is increased interest in better characterizing these materials, especially with less cement in the mix. Cellular grouts with fly ash (Class C) as a replacement for cement are characterized in this study based on their setting time, compressive properties, shrinkage and water absorption. Field samples were collected with unit weights in the range of 6.8 kN/m3 (43 pcf) and 8.6 kN/m3 (55 pcf) for this investigation. The effect of using 50% fly ash (Class C) as cement replacement was investigated. The addition of fly ash increased the initial setting time and reduced the compressive strength and modulus of the 8.5 kN/m3 (54 pcf) cellular grout but had a lesser effect on the 6.8 kN/m3 (43 pcf) grout. The addition of fly ash reduced the shrinkage of the grout. The compressive strength and modulus of grouts increased with unit weight of grouts and curing time. Cellular grouts showed varying amounts of water absorption, being dependent on the initial unit weight of the grout.
Properties of Fly Ash-Cement Cellular Grouts for Sliplining and Backfill Applications
Vipulanandan, C. (author) / Kumar, M. Neelan (author)
Geo-Denver 2000 ; 2000 ; Denver, Colorado, United States
2000-07-24
Conference paper
Electronic Resource
English
Properties of Fly Ash-Cement Cellular Grouts for Sliplining and Backfill Applications
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