• 한국건설순환자원학회논문집
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• 제10권1호
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• pp.15-22
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• 2022

이 연구에서는 매년 대량으로 발생하는 커피찌꺼기를 건설소재로 재활용하기 위해 커피찌꺼기와 커피찌꺼기 애시를 혼입한 시멘트 모르타르의 수화반응성을 검토하고 강도 특성을 조사하였다. 연구 결과, 커피찌꺼기의 소성온도가 높아질수록 유기물의 연소로 인한 질량 손실은 커졌으나 밀도는 증가하는 것으로 나타났다. 또한 커피찌꺼기를 혼입했을 때는 시멘트 수화반응성이 저조하여 압축강도가 현저히 낮아졌다. 반면, 800 ℃에서 소성시킨 커피찌꺼기 애시는 수화반응이 원활하였으며, 압축강도는 OPC 모르타르와 동등한 수준으로 나타났다.

• Journal of the Korean Wood Science and Technology
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• 제51권1호
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• pp.23-37
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• 2023

One type of biomass that has promising potential for bio pellet production is spent coffee grounds (SCGs). However, previous studies have shown that SCGs in bio pellets cause a lot of smoke. Therefore, they need to be mixed with a material that has a higher calorific value to produce better quality pellets. One material that can be used is pine wood because it has a natural resin content that can increase the calorific value. The aim of this study was to examine the quality of bio pellets produced with SCGs and pine wood charcoal at different particle sizes. The charcoal was ground using either a hammer mill (HM) or a ball mill (BM). Pine wood charcoal was mixed with SCGs at ratios of SCGs to pine wood charcoal of 4:6 and 6:4 by weight, respectively, and the adhesive used a tapioca with a composition ratio 5% of the raw material. The bio pellets were produced using a manual pellet press. The quality of the bio pellets was assessed based on Indonesian National Standard (SNI) 8021-2014, and the physical observations include flame length, burning rate, and compressive strength. The average water content, ash content, and calorific value of the bio pellets were in accordance with SNI 8021-2014, but the density and ash content values were below the standard values. The BM variation of bio pellets had a higher compressive strength than the HM variation, and the 4:6 BM variation had the longest burning time compared with 4:6 HM.