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초록· 키워드

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The crisis of aggregate supply has been serious for the last three years, and is recently even worsening with the stoppage of the import of sand from North Korea in May 2007.
The problem in aggregate supply is spreading throughout the country, and in June 2007 ready mixed concrete companies in Chungcheongbuk do stopped their operation as they could not be supplied with aggregate.
Due to the difficulty in aggregate supply, there can be problems in the quality and quantity of aggregate supplied to ready mixed concrete companies. Particularly in fine aggregate with a relatively high water absorption ratio compared to coarse aggregate, there can be the change of volume and weight according to the water content of aggregate. In addition, it is believed that, with the same volume, the weight may change according to the water content of fine aggregate depending on the distance of transportation.
Particularly for washed sand used by most of ready mixed concrete companies in the capital area, the variation of its property, volume and weight is considered larger than that of river sand used in the past. However, previous researches on washed sand are mostly for the absolute dry state and surface dry state, and few researches have been made on changes in the volume and weight of aggregate according to water content. In this situation, it is very hard for each ready mixed concrete company to manage supplied aggregate.
Thus, the present study purposed to examine the change of weight and volume of aggregate according to water content and the distance of transportation for fine aggregate supplied to the present company, to measure the variation of the weight and volume of fine aggregate supplied to ready mixed concrete companies according to water content, and ultimately to find the optimal water content of aggregate supplied and the optimal weight and volume for the water content.

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Abstract
1. 서론
2. 실험개요
3. 실험결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2009-540-014970812