도시쓰레기 소각재 슬래그로 제조된 지오폴리머의 특성
Characterization of geopolymer made of municipal solid waste incineration ash slag
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본 연구에서는 도시 쓰레기 소각재 슬래그에 알칼리 활성화제로서 NaOH를 첨가하여 지오폴리머를 합성하고그 물성을 평가하였다. 특히 NaOH의 몰농도, 원료의 입도 그리고 액체/고체 비율이 제조된 지오폴리머의 압축강도에 미치는 영향을 조사하였다. 원료의 입도가 미세할수록 합성된 지오폴리머의 강도는 증가하였으며, 액체/고체 비율의 최적 값은0.13으로 나타났다. 합성된 지오폴리머의 압축강도는 첨가된 NaOH의 몰농도가 증가함에 따라 함께 증가하는 경향을 나타내었으나, 20 M 이상의 농도에서는 일정 값에 수렴하였다. 20 M 이상의 NaOH 농도로 제조된 지오폴리머에는 sodiumaluminum silicate 및 sodium aluminum silicate hydrate 형태의 2종류 zeolite 결정상이 생성되었다. 20 M NaOH 및 70oC 양생조건으로 제조된 시편에서 가장 높은 압축강도, 163 MPa이 발현되었으며, 이것은 고농도의 NaOH가 지오폴리머 반응 및치밀한 미세구조 형성을 촉진시켰기 때문인 것으로 사료된다. 본 연구에서 제조된 고강도의 지오폴리머는 향후, 도시쓰레기 소각재 슬래그의 재활용율 제고는 물론 시멘트 대체 분야 발전에 일조할 것으로 기대된다.
Abstract
In this research, the geopolymer was fabricated using municipal solid waste incineration ash (denoted as MSWIA)slag and alkali activator, NaOH and its properties were analyzed. Particularly, the effects of NaOH molarity, particle size ofMSWIA, and liquid/solids ratio on the compressive strength of geopolymers were investigated. The compressive strength ofgeopolymers fabricated increased with finer grain size of MSWIA, and optimum value of the liquid/solids ratio wasidentified as 0.13. As the molarity of the NaOH increased, the compressive strength of geopolymers was increased. Evenmore the 20 M of NaOH, but the strength was not increased. The calcium aluminum silicate and calcium aluminum silicatehydrate zeolites were generated in the geopolymer fabricated with more than 20 M of NaOH, with some unreacted silica andunknown crystals remained. The highest compressive strength, 163 MPa, of geopolymer was appeared at conditions of curingtemperature 70oC, and 20 M of NaOH, indicating that the high concentration of NaOH accelerates the geopolymer reactionand dense microstructure. The high-strength geopolymer fabricated in the present study is expected to contribute significantlyto develop the field of cement alternative substances and to improve the recycling rate of MSWIA slag.
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