This study examines the effects of different types of wood chips on the characteristics of the unconfined compression (UC) of geomaterials composed of wood chips and converter steelmaking slag. Three types of wood chips – coconut fibre, hinoki and larch – were used to form specimens through the compaction of a mixture of wood chips, steelmaking slag and blast-furnace fine slag powder at predetermined ratios. UC tests were conducted on the specimens after they had been cured for 7, 28 and 84 days. The following observations were made: (a) The characteristics of UC changed drastically with the shape and ratio of wood chips mixed with slag. (b) When the durations of curing were different, the mixing of wood chips had different effects on the mechanical properties of the composite material. (c) Even when the ratio of wood chips in the mixture was >33 vol.%, the UC strength increased due to curing regardless of their shapes. (d) The mixture of wood chips and slag had lower strength than slag only but became a tough geomaterial. Besides, its UC strength was lower than that of slag only but not significantly lower than that of ordinary geomaterials.
The mixture of clayey soil and steelmaking slag has the property of solidification, where the mixture is consolidated as it solidifies. This study examines the effects of the consolidation of the mixture owing to overburden pressure during curing on properties of its shear strength. A unconfined compression test and a consolidated-undrained triaxial compression test (CU test) were performed on specimens that had been cured while applying an overburden pressure to clayey soil mixed with steelmaking slag. The results of the unconfined compression test revealed that the relationship between overburden pressure and qu at the same duration of curing was linear, and both the slope and intercept of the primary equation increased with the duration of curing. The CU test showed that an overburden pressure of 50 kN/m 2 during curing increased the value of qmax by 2.7 times when the mixture was cured under atmospheric pressure for 28 days. In addition, regardless of the presence of overburden pressure during curing, as solidification progressed, a peak appeared in the q-p' plane beyond q/p'= 3.
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