쇄석을 이용한 인공모래 개발연구 (II)
|서명||쇄석을 이용한 인공모래 개발연구 (II)|
|초록||The sand obtained from river is not sufficient in amount for the demand of construction industry. The production of sand from sea and mountain is rapidly increasing for the substitution of the river sand. The industry of the crushed sand has recently been brisked for the above. Crushing, classification and dewatering are the main processes in the crushed sand production. This report concentrates the improvement of classification technology and the quality of ready mixed concrete. Air separator with testing size for the classification in the process of dry system was developed by the Yeung Nam university. This plant has the excellent efficiency for the collection of fine powder, but needs the improvement for separating function. The collection efficiency of the testing size air separator is reached to 99% in the condition of high revolution and low feeding speed. The classification efficiency is checked about 50% maximum in the condition of 200 rpm and dry sample. Energy saving test was carried out in the production process of the dry system with the rock samples of 14-17% of water content. The classification efficiency for dewatering sample passed the heating process was analysed 91.5%. But that for high water content sample skipped the heating process was analysed more or less 77%. Even though the heating process causes the classification efficiency being high, the energy consumption can also cause the price of the crushed sand high. Water content of sample as the effective element for the optimization of classification efficiency and energy saving should be studied next year. The quality of crushed sand in the mixing design. The test was carried out with the various content in mixing, the strength of ready mixed concrete has the maximum for the mould with 50-60% content of crushed sand. This strength is higher by 5-30% than 30% content and by 20-32% than 0% content, which means that the industry has the possibility of progress. And this report mentions the possibility of utilization in agricultural industry of the sludge which is treated as waste in the crushed sand plant. The crop growth rate was improved due to higher water holding capacity is soil, which increases the water transfer and pH than those of indigenous dust waste. Also, we expect the nutritional sources for crops and the dilution effects for the salts remained in soils resulted from the variety of inorganic ionic species contained in itself. To utilize the dust waste efficiently, the mixing ratio for dust waste and organic matter has to be 7 to 3. On the other hand, it needs a further investigation of application and utilization of the dust form aggregate plant because of its possibility as a waste recycling|
|페이지||vii, 108 p.|
|키워드||쇄석, 인공모래, 콘크리트, 미분슬러지, 슬러지, 상토|
박철환. (1998). 쇄석을 이용한 인공모래 개발연구 (II). 韓國資源硏究所.