Date of Award


Publication Type

Master Thesis

Degree Name



Civil and Environmental Engineering


Engineering, Environmental.




Precast concrete industries generate waste during routine hollow-core slab cutting (sludge 1) and mixer tank washing (sludge 2) operations. The wastes are typically disposed of by landfilling, an unsustainable practice. This study examined various options for better management of the two sludges: volume reduction for easier handling and transport, and sustainable, long-term beneficial reuse. Dewatering tests were carried out on sludge 1 to reduce the water content and volume of the sludge. Gravity settling yielded about 30% cake solids from 20%, and chemical conditioning with high charged cationic polymer resulted in 40% cake solids. Vacuum filtration and centrifugation achieved the highest cake solids of 50%. Cost analysis demonstrated that the vacuum filtration offered the least capital costs. This study demonstrated that precast concrete industry sludge could be beneficially reused or recycled to provide a long-term sustainable waste management option to the precast concrete industry sector. (Abstract shortened by UMI.)Dept. of Civil and Environmental Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2005 .G69. Source: Masters Abstracts International, Volume: 44-03, page: 1471. Thesis (M.A.Sc.)--University of Windsor (Canada), 2005.