Influence of coal bottom ash as fine aggregate on fresh properties of concrete

Properties of Foundry Sand, Ground Granulated Blast Furnace Slag and Bottom Ash Based Geopolymers under Ambient Conditions

“…The utilization of bottom ash as replacement to cement has not yet been well acknowledged as itself is porous and increases the water requirement of the mix [10,16,17]. In contrast Bottom ash retains the water added and releases it during mixing and the workability of fresh geopolymer mortar is increased with increase in Bottom upto 75% beyond which it decreases due to interparticle friction [18]. Hence an effective utilization of bottom ash as construction material will significantly eliminate the disposal problems as well as environmental pollution.…”

The Effect of sieved Coal Bottom Ash as a Sand Substitute on the Properties of Concrete with Percentage Variation in Cement

“…and Rocha et al, [2] reported that because the bottom ash porosity was high, the w/c ratio of the concrete could not be accepted as accurate, whereas Chai Jaturapitakkul and Raungrut Cheerarot [3] reported that the bottom ash had a potential high enough to function as a good pozzolanic material. Rafat Siddique [15] conducted a detailed investigation on the mechanical properties of various concrete mixtures in which fine aggregates were partially replaced with class F fly ash by weight.…”

Effects of Crushed Coal Bottom Ash on the Properties of Mortar with Various Water-to-binder Ratios

“…플라이 애시를 포틀랜드 시멘트와 치환하여 사용함에 따라 유동성 및 일부 내구성 개선, 수화열 저감 등의 부가적 이익이 있 는 반면, 바텀애시를 일반 모래와 치환할 경우 강도 및 유동성 감소, 펌프 압송성(Pumpability)의 급격한 악화 등의 문제가 발생하기 때문이다 1,4) . 이러한 이유로 국내 남동발전의 2015년 석탄재 전체의 재활용률은 약 81.9%에 이르는 반면, 그 중 바텀애시의 재활용률은 발 생량의 11%에 그친다 5) . 이 문제를 극복하기 위한 한가지 방법 중 하나는 바 텀애시를 파쇄(Crushing) 하는 것이다 6) .…”