건설자재의 투입 구조 및 원단위 분석

&nbsp;&nbsp;The objective of this study is to suggest the inputs of construction materials per unit output of construction investment or building permit area(㎡), and to analyze input structure of construction materials based on statistics regarding consumption of construction materials, the amount of construction investment, and input-output tables published by the bank of Korea.<BR>&nbsp;&nbsp;Based on the research results, it was revealed that ready-mixed concrete was the most massively used in construction works, which was inputted 4,400 billion won&quot;s worth in 2000 and made up 11.8% of total input of construction materials. Subsequently, structural metal products that covered 10.5%(3,900 billion won) and steel bar that made up 7.0%(2,500 billion won) had high relative importance.<BR>&nbsp;&nbsp;Input of cement per unit of construction investment (2000 constant price) had decreased by 5.2 percent from 501 ton/billion won during 1996-1999 to 475 ton/billion won during 2000-2005. The reason is because substitutive materials for cement such as fly ash or blast furnace slag had increased dramatically since 2000 and will be increased for the present. Moreover, input of plywood has been decreased owing to the popularization of systemized sheathing boards made of steel or plastic as well as the input of hume pipe has declined owing to the decrease of drainage works.<BR>&nbsp;&nbsp;On the other side, inputs of tile and toilet stool per unit of construction investment have increased. The reason is because the floor plan that adopts two bathrooms in a house has been popularized and demand for remodeling housing has increased dramatically.<BR>&nbsp;&nbsp;Basic unit of the major construction materials for structural frame such as steel bar, ready-mixed concrete, and aggregate have increased around 10%, the reason is because the regulation for earthquake-proof structural design has been enforced as well as underground parking area has been generalized in apartment houses. Also, input of concrete pile per unit of construction investment has been greatly increased thanks to the activation of redevelopment or reconstruction projects and high-rise apartment houses. Inputs of gypsum board products have been increased about 30% thanks to the increase of floor designs for skeleton and infill housing.<BR>&nbsp;&nbsp;Finally, input of construction materials per 1 billion won of construction investment based on current price of 2005 were estimated 467 tons of cement, 86 tons of steel bar, 1,085㎥ of ready-mixed concrete, 1,938㎥ of aggregate, 26.4 tons of H-beam. Moreover, input of construction materials per 1 thousand ㎡ of building permit area were estimated 230 tons of cement, 522 tons of steel bar, 589㎥ of ready-mixed concrete, 16.7 tons of H-beam, and so forth.<BR>&nbsp;&nbsp;The input per unit of construction investment suggested from this study can be used for government or construction companies to forecast the yearly demand of construction materials or to estimate roughly the amount of construction materials needed in a construction project.