| Title |
Engineering Characteristics of Light-weight Foamed CLSM using Coal Ash According to Final Mixing Time and Dilution Ratio |
| Authors |
이종휘(Lee, Jong Hwi) ; 나정흠(Na, Jeong Hum) ; 이창기(Lee, Chang Ki) ; 천병식(Chun, Byung Sik) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.1C.017 |
| Keywords |
석탄회;비빔시간;희석비;경량기포 CLSM;일축압축강도 시험;플로우 시험;기포슬러리의 단위중량측정 시험 coal ash;mixing time;dilution ratio;light-weight foamed CLSM;unconfined compressive strength test;flow test;slurry unit weight test |
| Abstract |
CLSM (Controlled Low Strength Material) using coal ash, which has the advantages of self-leveling, self-compacting, flowability, easy re-excavation, has been developed. In this study, CLSM additionally mixed with foaming agent for structural backfill material, aimed at lightness of materials, was developed called light-weight foamed CLSM. As the basic study of this material, to determine the optimum final mixing time and dilution ratio of existing light-weight foamed CLSM, flow, slurry unit weight and unconfined compressive strength test according to each impact factor were performed at the standard mix proportion. As the results of tests, CASE N (Final mixing time 4 min, dilution ratio 2%), CASE O (Final mixing time 3 min, foam agents ratio 3%, dilution ratio 2%) were satisfied with the standard of flow test (above 20cm), slurry unit weight test (12~15 $kN/m^3$) and unconfined compressive strength test (800 kPa~1200 kPa). These results will indicate the standard optimum final mixing time and dilution ratio of light-weight foamed CLSM for structural backfill. |