PURPOSE:To enable measurement of a strength of coke under conditions the most similar to actual operation by measuring the strength using a sieve after a load is applied to coke within a housing box to vibrate to evaluate a powdering behavior when it drops. CONSTITUTION:A bottom wall 7 is closed, a specified amount of coke 1 to be tested is housed into a coke housing box 2 and a weight 3 is placed on the top thereof to apply a specified load to the coke 1. Then, a pair of vibration side walls 5 of the housing box 2 is vibrated with a driving mechanism 11 for a fixed time length at a specified frequency and amplitude. Thereafter, the bottom wall 7 is opened to discharge the coke 1 from the housing box 2. Then, the coke 1 discharged is sieved and a proportion thereof on the sieve is measured to determine a powdering, namely, strength thereof. With such an arrangement, when the coke falls within a blast furnace, a powdering behavior generated by a shear stress is evaluated. This enables measurement of the strength of the coke under conditions the most similar to actual operation.
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