Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Substrate Surface Water on Adhesive Properties of High Flowable VA/VeoVa-modified Cement Mortar for Concrete Patching Material

단면수복용 고유동성 VA/VeoVa 개질 시멘트 모르타르의 부착특성에 대한 피착면 표면수의 영향

  • 도정윤 (군산대학교 환경건설연구소) ;
  • 김두기 (군산대학교 토목공학과)
  • Received : 2013.04.03
  • Accepted : 2013.06.17
  • Published : 2013.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

Experiments were divided into two parts; one part is to understand the basic properties of high flowable VA/VeoVa-modified cement mortar with different polymer cement ratio (P/C) and the weight ratio of fine aggregate to cement (C:F) and the other part is to investigate the effect of surface water spread on the concrete substrate on adhesion in tension. To understand the basic performance, the specimens were prepared with proportionally mixing VA/VeoVa redispersible powder, ordinary portland cement, silica sand, superplasticizer and viscosity enhancing agent. Here, P/C were 10, 20, 30, 50 and 75% and C:F were 1:1 and 1:3. As the change of P/C and C:F unit weight, flow test, crack resistance and adhesion in tension were measured. Three specimens with good adhesion properties were selected among specimens with different P/C and C:F. The effect of surface water evenly sprayed on concrete substrate on adhesive strength is investigated. The results show that surface water on concrete substrate increases the adhesion in tension of high flowable VA/VeoVa-modified cement mortar and additionally improves the flowability compared to the non-sprayed case.

본 연구에서는 고유동성의 VA/VeoVA 개질 시멘트 모르타르의 기초적 성능을 측정한 후 콘크리트의 보수용 재료에 매우 중요한 요구성능인 부착강도에 대한 피착체의 표면에 존재하는 표면수량의 영향을 검토하는 연구가 수행하였다. 시험체의 배합은 VA/VeoVA는 결합재인 시멘트에 대하여 고형분비 (폴리머시멘트비; P/C)에 의하여 10, 20, 30, 50, 75%, 잔골재는 시멘트의 중량에 대하여 각각 1:1, 1:3의 비율을 적용하였다. 고유동성 VA/VeoVA 개질 시멘트 모르타르의 기초적인 성능을 토대로 부착강도, 잔갈림성, 재료분리 저항성이 좋은 시험체를 선택하였다. 시험체는 C:F=1:1인 경우 P/C=20%, 30%의 시험체 2개가 선택되었으며, C:F=1:3인 경우 P/C=50%의 시험체 1개, 총 3개가 선택되었으며 이 3개의 배합에 대하여 피착체의 표면수량에 따른 고유동성 VA/VeoVA 개질 시멘트 모르타르의 특성을 파악하였다. 본 연구를 통해 콘크리트 피착체에 살포된 표면수는 부분적으로 고유동성 VA/VeoVA 개질 시멘트 모르타르의 부착강도를 증진하고, 유동성을 개선하는 효과가 있다는 결론을 얻었다.

Keywords

References

  1. Afridi, M., Ohama, Y., Iqbal, M. Z. and Demura, K., "Water retention and adhesion of powdered and aqueous polymer-modified mortars", Cement and Concrete Composites, Vol. 17, 1995, pp.113-118. https://doi.org/10.1016/0958-9465(95)00007-Y
  2. Brocken, H. J. P., Spiekman, M., Pel, L., Kopinga, K. and Larbi, J., "Water extraction out of mortar during brick laying: a NMR study", Materials and structures, Vol. 31, 1998, pp.49-57. https://doi.org/10.1007/BF02486414
  3. Chandra, S. and Ohama, Y., Polymers in Concrete, CRC Press, Boca Raton, Fla, 1994, pp.5-8.
  4. Do, J. and Kim, D., "Adhesive Properties of High Flowable SBR-modified Mortar for Concrete Patching Material dependent on Surface Water Ratio of Concrete Substrate", The Journal of the Korea Institute for Structural Maintenance and Inspection, Vol. 17, No. 2, 2013 (in Korean with English abstract). https://doi.org/10.11112/jksmi.2013.17.2.124
  5. Do, J., Soh, Y., "Adhesive Strength in Tension of SBR-Modified Cement Mortar with Self-Flowability Material for Floor-Finishing", Journal of Korea Concrete Institute, Vol. 15, No. 4, 2003a, pp.549-556 (in Korean with English abstract). https://doi.org/10.4334/JKCI.2003.15.4.549
  6. Do, J., Soh, Y., "Performance of polymer-modified self-leveling mortars with high polymer-cement ratio for floor finishing", Cement and Concrete Research, Vol. 33, 2003b, pp.1497-1505. https://doi.org/10.1016/S0008-8846(02)01057-8
  7. Ohama, Y., Handbook of polymer-modified concrete and mortars: properties and process technology: William Andrew, 1995.
  8. Schulze, J. and Killermannn O., "Long-term performance of redispersible powders in mortars", Cement and Concrete Research, Vol. 31, 2001a, pp.357-362. https://doi.org/10.1016/S0008-8846(00)00498-1
  9. Wahby, W. S., Fifty years' history of polymer in concrete in Review, ACI International, Publication-SP 214-2, 2003, pp.13-14.
  10. Wang, R. et al., "Effect of redispersible viny acetate and versatate copolymer powder on flexibility of cement mortar", Construction and Building Matrials, Vol. 27, 2012, pp.259-262. https://doi.org/10.1016/j.conbuildmat.2011.07.050