Shear Characteristics of Geomaterials Mixed with Fibrous Wood Chip and Converter Steelmaking Slag

Under-sieve residue is a sediment containing large amounts of wood chips generated by natural disaster. The mechanical properties of this residue have not been well understood, and thus, it has usually been landfilled. The development of a method for effective utilization of under-sieve residue is believed to facilitate quick recovery and reconstruction during disasters. Accordingly, this study aimed to devise an effective approach to convert under-sieve residue into a geological material. Consolidated-drained triaxial compression (CD) tests were performed using mixtures of coconut fiber, which closely resembles under-sieve residue, with steelmaking slag and blast furnace slag fine powder to understand the effect of the mixing ratio of coconut fiber and curing periods. The results indicated that the maximum shear strength of the slag mixed with coconut fiber at 5% (coco5) by volume was higher than that of a “slag only” specimen regardless of curing periods. The maximum shear strength of the slag mixed with coconut fiber at 10% (coco10) or 33% (coco33) by volume was higher than that of “slag only” without curing. However, the maximum shear strength of coco10 or coco33 did not increase with curing.