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This study was conducted to investigate the use of post-consumer corrugated board in controlled low-strength material (CLSM) applications. Corrugated fiberboard (termed corrugate), which constitutes a significant fraction of the municipal solid waste stream in the United States (approximately one third by weight), was used as a partial replacement for fine aggregate in CLSM at aggregate replacement ratios ranging from 0 % (i.e., control) to 6 %. The corrugate was fiberized (i.e., repulped) in a blender prior to being mixed with other constituents in the CLSM. The density, air content, and flow consistency of the fresh CLSM were determined, and bleeding was qualitatively assessed. Also, the unconfined compressive strength was determined for the resulting mixtures at different test ages. As the corrugate content increased, air content and water demand increased, density and compressive strength decreased, and some mixtures exhibited excessive bleeding. Corrugated fiberboard was determined to be effective as a fine aggregate replacement to produce mixtures with 28-day compressive strengths within the range for excavatable CLSM.
controlled low-strength material, flowable fill, corrugated fiber-board, reuse of byproducts
Hanson, James L.
Professor, Civil and Environmental Engineering Dept., California Polytechnic State Univ., San Luis Obispo, CA
Stone, Gregory M.
Staff Engineer, Avocet Environmental, Irvine, CA
Director, Global Water Research Institute, California Polytechnic State Univ., San Luis Obispo, CA