Mechanical Behavior Comparison of Cemented Sludge Reinforced by Waste Material and Several Crop Residues

摘要

A series of experiments including unconfined compression, permeability, and durability tests were performed to evaluate and compare the effect of different fiber materials on cemented sludge under the same mixing condition. The used fiber materials in the present work consisted of rice straw, corn silk, rice husk, and paper debris. The results showed that fiber materials improved compressive strength, anti-seepage capacity, and durability of cemented sludge. Namely, compressive strength of cemented sludge was improved from 70.4 kPa to 157.3 kPa, 180.8 kPa, and 228.1 kPa with respect to the addition of paper debris, corn silk, and rice straw. Nevertheless, the results of specimens reinforced by rice husk changed slightly as compared to that of cemented sludge in term of compressive strength. The addition of fiber materials decreased the hydraulic conductivity of cemented sludge from 22% to 73%. Besides, with rice straw, corn silk, and paper debris inclusion, specimens could survive after 10 cycles of drying and wetting, meanwhile, cemented sludge and rice husk reinforced cemented sludge were destroyed in the first cycle and fourth cycle, respectively.