ABSTRACT
Used timbers are exhausted more than 12 millions cubic meter per year from demolished buildings mainly from wooden houses in Japan. The authors have carried out a study of recycling used timber as wood-chip concrete. This special concrete was made under following conditions, water-cement ratios: 0.35, 0.40, 0.50 and 0.60, and wood-chip packing ratios in volume: 30, 40, 50, 60%. Density of the concrete could be controlled by the woodchip packing ratio, and usually fall into the range from 920 kg/m3 to 1250 kg/m3. Bending strength, compressive strength, shrinkage, thermal conductivity, coefficient of thermal expansion, working with hand tools were tested to evaluate the performance of the wood-chip concrete. From these tests, it is found that wood-chip concrete can be used as a building material.
