Improved living condition of concrete structure placing with wood-based material

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Concrete form plywood Is removed from hardening concrete and Is damped or burned as rubbish. Damping and burning wood has been a sdrious problem as a loss of wood resource and release of carbon-dioxide to air. This project focussed on stocking wood resource In reinforced concrete structure and Improving llvlng condition of the structure by not removing wood-based materials for concrete form.(1) Bonding strength between wood-based materials and concrete, the behavior of water during -concrete hardening was measured. Wood-based materials such as plywood for concrete form and wool cement board might be effective for anchor effect. Velocity of stress wave and ultra-sonlc wave was effected by hardenlng of concrete and release of water. (2) Existence of wood-based materials after concrete hardening has effect for protecting condensation on the surface, Improving Insulation and control of humldlty In the "space.(3) Fire protecting by wood-based materials was investigated. The rate of burning of wood-based material might be delayed by combination effect in concrete placing.