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Title |
Properties of Controlled Low-Strength Material Containing Bottom Ash
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Keywords |
저강도 고유동 충전재; 굴착성; 압축강도; 플로우; 플라이애쉬; bottom ash; controlled low-strength material(CLSM); fly ash; flow; bottom ash |
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Abstract |
The effectiveness of bottom ash on the mechanical and physical properties of Controlled Low-Strength Material(CLSM) is investigated in this study, CLSM is defined by the ACI Committee 229 as a cementitious material that is in a flowable state at the time of placement and having a specified compressive strength of 83 kgf/㎠ or less at the age of 28 days. This study was undertaken on the use of bottom ash as a fine aggregate in CLSM. Four different levels of bottom ash with fly ash contents, 25%, 50 %, 75%, 100%, are investigated. Laboratory test results conclude that inclusion of bottom ash increases the demand for mixing water in obtaining the required flow. However, the sand was reduced because it was adjusted to maintain a constant total volume. Mixture proportions were developed for producing CLSM at three 28-day strength levels: removal with tools (less than 7 kgf/㎠), mechanical means (less than 20 kgf/㎠), and power equipment (less than 83 kgf/㎠). The physical and mechanical properties supports the concept that by-product bottom ash can be successfully used in CLSM.
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