한국건축시공학회지 (Journal of the Korea Institute of Building Construction)

  • 제21권4호
  • /
  • Pages.269-279
  • /
  • 2021
  • /
  • 1598-2033(pISSN)
  • /
  • 2233-5706(eISSN)
한국건축시공학회 (The Korean Institute of Building Construction)
권호 표지
DOI QR코드

DOI QR Code

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

  • Wi, Kwangwoo (Department of Civil, Construction, and Environmental Engineering, Iowa State University) ;
  • Lee, Han-Seung (Department of Architectural Engineering, Hanyang University) ;
  • Lim, Seungmin (Department of Architecture, Kangwon National University)
  • 투고 : 2021.06.02
  • 심사 : 2021.07.20
  • 발행 : 2021.08.20
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

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.

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.

키워드

과제정보

This work has supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government (MSIT)(No.2020R1C1C1004299). This study was supported by 2020 Research Grant from Kangwon National University.

참고문헌

  1. Thomas BS, Kumar S, Arel HS. Sustainable concrete containing palm oil fuel ash as a supplementary cementitious material-A review. Renewable and Sustainable Energy Reviews. 2017 Dec;80:550-61. https://doi.org/10.1016/j.rser.2017.05.128
  2. Islam A, Alengaram UJ, Jumaat MZ, Bashar II. The development of compressive strength of ground granulated blast furnace slag-palm oil fuel ash-fly ash based geopolymer mortar. Materials & Design. 2014 Apr;56:833-41. https://doi.org/10.1016/j.matdes.2013.11.080
  3. Ismail M, Ismail ME, Muhammad B. Influence of elevated temperatures on physical and compressive strength properties of concrete containing palm oil fuel ash. Construction and Building Materials. 2011 May;25(5):2358-64. https://doi.org/10.1016/j.conbuildmat.2010.11.034
  4. Awal AA, Shehu IA. Evaluation of heat of hydration of concrete containing high volume palm oil fuel ash. Fuel. 2013 Mar;105:728-31. https://doi.org/10.1016/j.fuel.2012.10.020
  5. Tangchirapat W, Jaturapitakkul C. Strength, drying shrinkage, and water permeability of concrete incorporating ground palm oil fuel ash. Cement and Concrete Composites. 2010 Nov;32(10):767-74. https://doi.org/10.1016/j.cemconcomp.2010.08.008
  6. Nath P, Sarker, P. Effect of fly ash on the durability properties of high strength concrete. Procedia Engineering. 2011 Oct;14: 1149-56. https://doi.org/10.1016/j.proeng.2011.07.144
  7. Sasanipour H, Aslani F, Taherinezhad J. Effect of silica fume on durability of self-compacting concrete made with waste recycled concrete aggregates. Construction and Building Materials. 2019 Dec;227:116598. https://doi.org/10.1016/j.conbuildmat.2019.07.324
  8. Jaturapitakkul C, Tangpagasit J, Songmue S, Kiattikomol K. Filler effect and pozzolanic reaction of ground palm oil fuel ash. Construction and Building Materials. 2011 Nov;25(11):4287-93. https://doi.org/10.1016/j.conbuildmat.2011.04.073
  9. Wi K, Lee HS, Lim SM, Song H, Hussin MW, Ismail MA. Use of an agricultural by-product, nano sized palm oil fuel ash as a supplementary cementitious material. Construction and Building Materials. 2018 Sep;183:139-49. https://doi.org/10.1016/j.conbuildmat.2018.06.156
  10. Ranjbar N, Behnia A, Alsubari B, Birgani PM, Jumaat MZ. Durability and mechanical properties of self-compacting concrete incorporating palm oil fuel ash. Journal of Cleaner Production. 2016 Jan;112(1):723-30. https://doi.org/10.1016/j.jclepro.2015.07.033
  11. Awal AA, Hussin MW. The effectiveness of palm oil fuel ash in preventing expansion due to alkali-silica reaction. Cement and Concrete Composites. 1997 Aug;19(4):367-72. https://doi.org/10.1016/S0958-9465(97)00034-6
  12. Chandara C, Sakai E, Azizli KAM, Ahmad ZA, Hashim SFS. The effect of unburned carbon in palm oil fuel ash on fluidity of cement pastes containing superplasticizer. Construction and Building Materials. 2010 Sep;24(9):1590-3. https://doi.org/10.1016/j.conbuildmat.2010.02.036
  13. Wi KW, Lee HS, Lim SM, Ismail MA, Hussin MW. Effect of using micropalm oil fuel ash as partial replacement of cement on the properties of cement mortar. Advances in Materials Science and Engineering. 2018 Nov;2018:1-8. https://doi.org/10.1155/2018/5164030
  14. Depasse J. Simple experiments to emphasize the main characteristics of the coagulation of silica hydrosols by alkaline cations: Application to the analysis of the model of Colic et al. Journal of Colloid and Interface Science. 1999 Dec;220(1):174-6. https://doi.org/10.1006/jcis.1999.6594
  15. Madani H, Bagheri A, Parhizkar T. The pozzolanic reactivity of monodispersed nanosilica hydrosols and their influence on the hydration characteristics of Portland cement. Cement and concrete research. 2012 Dec;42(12):1563-70. https://doi.org/10.1016/j.cemconres.2012.09.004
  16. Na SH, Kang HJ, Song YJ, Song MS. Effect of superplasticizer on the early hydration ordinary potland cement. Journal of the Korean Ceramic Society. 2010 Sep;47(5):387-93. https://doi.org/10.4191/KCERS.2010.47.5.387
  17. Kim JH, Kim DS, Lee BJ, Rho JS. Effect of adding of ii-anhydrite and superplasticizer on the fluidity of cement paste. Journal of the Korean Industrial and Engineering Chemistry. 1998 Jun;9(3):336-41.
  18. Zhang YR, Kong XM, Lu ZB, Lu ZC, Hou SS. Effects of the charge characteristics of polycarboxylate superplasticizers on the adsorption and the retardation in cement pastes. Cement and Concrete Research. 2015 Jan;67:184-96. https://doi.org/10.1016/j.cemconres.2014.10.004
  19. Liu M, Lei J, Guo L, Du X, Li J. The application of thermal analysis, XRD and SEM to study the hydration behavior of tricalcium silicate in the presence of a polycarboxylate superplasticizer. Thermochimica Acta. 2015 Aug;613:54-60. https://doi.org/10.1016/j.tca.2015.05.020
  20. Su Z, Bijen JMJM, Larbi JA. Influence of polymer modification on the hydration of portland cement. Cement and concrete research. 1991 Mar-May;21(2-3):242-50. https://doi.org/10.1016/0008-8846(91)90004-2
  21. Felekoglu B, Sarikahya H. Effect of chemical structure of polycarboxylate-based superplasticizers on workability retention of self-compacting concrete. Construction and Building Materials. 2008 Sep;22(9):1972-80. https://doi.org/10.1016/j.conbuildmat.2007.07.005