| Title |
An Experimental Study on Thermal Conductivity of Controlled Low Strength Materials with Coal Ash |
| Authors |
이승준(Lee, Seung Jun) ; 이종휘(Lee, Jong Hwi) ; 조현수(Cho, Hyun Soo) ; 천병식(Chun, Byung Sik) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.3C.095 |
| Keywords |
석탄회;지중송전케이블;열전도도 시험;관거 뒤채움재 coal ash;controlled low strength materials (CLSM);underground power cable;thermal conductivity;backfill materials |
| Abstract |
Due to current interest in creation of urban space and urban landscape, more emphasis has been placed on underground space development. With increasing number of underground power cables and its importance, a study of backfill materials for pipe is now imperative. Backfill materials require outstanding thermal characteristics since breakdown of cable insulation can be caused if heat generated from transmission of underground power cables had not been effectively discharged through backfill materials. Also, coal ash, which are industrial by-products, is being produced in high volume every year. Among them, ponded ash (PA) is not recycled and instead, mostly buried. Therefore in this study, thermal conductivity test based on mixture ratio (PA, ponded ash : FA, fly ash) was performed to evaluate the thermal conductivity characteristics of CLSM (controlled low strength materials) with coal ash. The results indicate that the mixture ratio (PA, ponded ash : FA, fly ash) of 80:20, water contents of 28~30%, and cement contents of 7-11% showed the highest conductivity at 0.796~0.884W/mK and thus, considered optimal in terms of recycling ponded ash (PA) as well as for maximizing utilization as backfill materials for pipe in underground. |