[논문]감수제의 사용이 micro-POFA 혼입 시멘트 페이스트의 초기 수화 특성에 미치는 영향에 관한 실험적 연구

위광우; 이한승; 임승민

doi:10.5345/jkibc.2021.21.4.269

[국내논문] 감수제의 사용이 micro-POFA 혼입 시멘트 페이스트의 초기 수화 특성에 미치는 영향에 관한 실험적 연구
Experimental Study on the Influence of Superplasticizer on the Early Hydration Properties of Cement Paste Containing Micro-POFA 원문보기

한국건축시공학회지 = Journal of the Korea Institute of Building Construction, v.21 no.4, 2021년, pp.269 - 279

위광우 (Department of Civil, Construction, and Environmental Engineering, Iowa State University) , 이한승 (Department of Architectural Engineering, Hanyang University) , 임승민 (Department of Architecture, Kangwon National University)

초록
AI-Helper

Palm Oil Fuel Ash(POFA)는 콘크리트의 물리적 특성 및 내구성을 향상시키기 위해 일정량 시멘트를 치환하여 사용된다. 그러나 높은 강열감량과 각진 입자 형상으로 인해 POFA를 사용한 콘크리트의 워커빌리티가 감소한다. 본 연구에서는 micro-POFA를 혼입한 시멘트 페이스트의 초기 물리적, 수화 특성에 감수제 종류 및 사용량이 미치는 영향을 mini-slump 실험, 초기 압축 강도, TGA, XRD, SEM을 이용하여 검토하였다. micro-POFA 치환율이 증가함에 따라 시멘트 페이스트의 유동성은 감소하였으며, 감수제의 사용량이 증가할수록 시멘트 페이스트의 유동성은 증가하였다. 또한, 감수제의 사용은 시멘트 페이스트의 초기 압축 강도를 저하시켰으며, 사용량이 증가할수록 압축 강도 저하가 뚜렷하게 나타났다. 미세분석을 통해 감수제가 C-S-H 형성을 억제하고 상대적으로 Ca(OH)₂의 생성량을 증가시켰기 때문이라고 사료된다.

Abstract ▼ AI-Helper

Palm Oil Fuel Ash(POFA) has been widely used to replace Portland cement to enhance the mechanical properties and durability of concrete. However, it reduces the workability of concrete due to the high content of unburnt carbon and its angular shape requiring the usage of superplasticizer to ensure a proper flowability. In this study, effects of different types and dosage of superplasticizer on the early mechanical and hydration properties of cement paste containing micro-POFA were evaluated using mini-slump test, early compressive strength, TGA, XRD, and SEM. The results indicated that the flowability of cement paste containing micro-POFA reduced as the replacement ratio of micro-POFA increased. As the dosage of superplasticizer increased, the flowability was also increased. In addition, the usage of superplasticizer reduced the early compressive strength, and the strength decreased with an increase in the dosage of superplasticizer. It was confirmed that superplasticizer hindered the formation of C-S-H leading to a relative increase in the formation of Ca(OH)2.

주제어

표/그림 (11)

표 Table 1. Chemical and physical properties of cement and mPOFA
표 Table 2. Mix proportion of cement pastes
그림 Figure 1. Mini-slump for pastes with Polycarboxylic SP
그림 Figure 2. Mini-slump for pastes with naphthalenic SP
그림 Figure 3. Compressive strength for pastes with polycarboxylic SP
그림 Figure 4. Compressive strength for pastes with naphthalenic SP
그림 Figure 5. Mass percentage of Ca(OH)₂ for pastes with polycarboxylic SP
그림 Figure 6. Mass percentage of Ca(OH)₂ for pastes with naphthalenic SP
그림 Figure 7. XRD pattern of mPA_P_10
그림 Figure 9. SEM of mPA_P_10
그림 Figure 8. XRD pattern of mPA_N_10

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