Laboratory evaluation of crushed glass-dredged material blends

A comprehensive laboratory evaluation of blending 9.5 mm (3/8 in.) minus curbside-collected crushed glass (CG) with dredged material (DM) was conducted to evaluate their potential for beneficial use as fill materials for urban applications. Tests were performed on 100% CG (USCS classification SP) and 100% DM (OH) specimens and 20/80, 40/60,50/50,60/40, and 80/20 CG-DM blends (dry weight percent CG content reported first). The addition of 20% CG resulted in a 10-20 point (33-67%) reduction in w(opt) while increasing the dry density by approximately 1-3 kN/m(3) for standard and modified levels of compaction, respectively. Simultaneously, the 2 order of magnitude. The compressibility of the DM was reduced by approximately 50% and the hydraulic conductivity was reduced by 1/2 addition of 20% CG significantly decreased the moisture content and significantly improved the workability of the 100% DM, where workability refers to the ease of handling, transport, placement, and compaction of the CG-DM blends (compared to 100% DM). CIU triaxial strength testing indicated effective friction angles of 34 and 37 degrees for 100% DM and CG compacted to a minimum of 95% relative compaction by ASTM D1557, respectively. A peak effective friction angle of 39 degrees occurred for the 60/40 and 80/20 CG-DM blends which were also I and 3 orders of magnitude more permeable than 100% DM, respectively. Related increases in c, resulted in decreased times required for consolidation. The range of properties obtainable by the CG-DM blends offers a versatility that allows for the design of fills that can be potentially optimized to meet multiple design parameters (e.g. strength, settlement, drainage, or higher CG or DM content).