솔잎재 콘크리트의 물리.역학적 특성

Physical and Mechanical Properties of Pine Needle Ash Concrete

This study is performed to evaluate the physical and mechanical properties of pine needle ash (PNA) concrete. Materials used for this experiment are PNA, normal portland cement, natural fine and coarse aggregate. Test results show that the unit weights of PNA concrete are decreased 1 % ∼3% and the highest strength is achieved by 5% PNA filled PNA concrete. Compresive strength increased by 5% , tensile strength by 20% and bending strength by 15% as compared with those of the normla cement concrete , respectively. The highest ultrasonic pulse velicity and dynamic mudulus of elasticity are acheved by 5% PNA filled PNA concrete, which are similar to those of the normal cement concrete.