| Title |
An Experimental Study on the Manufacturing Method for High Quality Recycled Fine Aggregate Using Low Speed Wet Abraser and Sulfuric Water |
| Authors |
Kim Jin-Man ; Kim Ha-Suk ; Park Sun-Gyu ; Kwak Eun-Gu ; Sun Joung-Soo |
| Keywords |
Recycled Fine Aggregate ; Abrasional Crusher ; Design of Experimental ; Physical & Chemical Properties |
| Abstract |
Recycled aggregate, produced by crushing waste concrete, can be used for many purposes. The use of recycled aggregate can save money for our society, create additional business opportunities, save energy when recycling is done on site, and conserve diminishing resources of urban aggregates. However the usage is limited to a lower value-add product such as the roadbed material. While the research and the development have been performed to produce the high quality recycled aggregate, recycled fine aggregate has low quality because it contains large amount of old mortar. To produce the high quality recycled aggregate, breaking and washing process must be added to the existing process to remove the ingredient of old mortar from aggregate. This paper is aim to develop the high quality recycled aggregate. The ingredient of cement paste is removed from recycled fine aggregate using both the low speed wet abrasional crusher as mechanical process and the acid treatment as chemical processes. Consequently, the optimum condition for this process is investigated for high quality recycled fine aggregate by using the design of experiments. For the result, recycled fine aggregate with dry density 2.51 and absorption ratio 2.3%, satisfying Korean standard for recycled fine aggregate, was made by this mechanical and chemical process. |