Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
권호 표지
DOI QR코드

DOI QR Code

Shrinkage Properties of Blast Furnance Slag Cement Mortar by using Frost-Resistant Accelerator

내한촉진제를 사용한 고로시멘트 모르타르의 수축성상

  • Choi, Hyeong-Gil (Graduate School of Architecture, Kyungpook National University) ;
  • Lee, Jun-Cheol (Daegyeong Regional Infrastructure Technology Development Center, Kyungpook National University)
  • Received : 2018.10.30
  • Accepted : 2018.12.17
  • Published : 2019.02.20
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the effects of blast furnance slag cement and frost-resistant accelerator on shrinkage properties and shrinkage properties of mortar were examined. As a result, the addition of the frost-resistant accelerator to both OPC and BB has a small effect on the flash properties of mortar and the compressive strength increases from the early ages. In addition, when a frost-resistant accelerator is used in excess of the standard usage amount, it is necessary to examine the relationship of the expansion behavior at the early age, especially, between the compressive strength development and the expansion property. And it was confirmed that the addition of the frost-resistant accelerator tended to increase the shrinkage of mortar using the OPC and BB. With the addition of the frost-resistant accelerator, the amount of pores with a diameter of under the 30nm, especially, the amount of pores with a diameter of 20 to 30nm and the amount of pores with an ink-bottle decrease, and the shrinkage increases. And it is considered that a change in the amount this range of pores has a large effect on the shrinkage property.

고로시멘트와 내한촉진제를 병용한 모르타르의 수축특성 및 수축성상에 미치는 영향에 대해 검토했다. 그 결과, OPC, BB 모두 내한촉진제를 첨가함에 따라 굳지 않은 성상에 미치는 영향은 작고, 초기재령부터 압축강도는 커진다. 또한, 내한 촉진제를 표준 사용량 이상으로 다량 사용할 경우에는 초기재령에 있어서의 팽창거동, 특히 강도발현과 팽창성의 관계에 대해 검토할 필요가 있다. 한편, 내한촉진제를 첨가함으로써 OPC, BB 모두 길이변화는 증가하는 경향을 확인할 수 있었다. 내한촉진제를 첨가함에 따라 직경 30nm 이하의 세공량, 특히 직경 20~30nm의 세공량 및 ink-bottle 세공량이 감소하여 수축량은 커지게 되며, 이 범위의 세공량의 변화가 수축성상에 미치는 영향이 크다고 판단된다.

Keywords

GCSGBX_2019_v19n1_59_f0001.png 이미지

Figure 1. Overview of expansion rate test[10]

GCSGBX_2019_v19n1_59_f0002.png 이미지

Figure 2. Fresh properties

GCSGBX_2019_v19n1_59_f0003.png 이미지

Figure 3. Compressive strength

GCSGBX_2019_v19n1_59_f0004.png 이미지

Figure 4. Expansion rate

GCSGBX_2019_v19n1_59_f0005.png 이미지

Figure 7. Total porosity ratio

GCSGBX_2019_v19n1_59_f0006.png 이미지

Figure 8. CH content

GCSGBX_2019_v19n1_59_f0007.png 이미지

Figure 9. Differential pore volume of OPC

GCSGBX_2019_v19n1_59_f0008.png 이미지

Figure 10. Differential pore volume of BB

GCSGBX_2019_v19n1_59_f0009.png 이미지

Figure 11. Cumulative pore volume

GCSGBX_2019_v19n1_59_f0010.png 이미지

Figure 12. Cumulative pore volume

GCSGBX_2019_v19n1_59_f0011.png 이미지

Figure 13. Relationship between pore volume and drying shrinkage (under the 30nm and 8nm diameter)

GCSGBX_2019_v19n1_59_f0012.png 이미지

Figure 14. Relationship between pore volume and dryingshrinkage (between 20-30nm diameter and ink bottle pore)

GCSGBX_2019_v19n1_59_f0013.png 이미지

Figure 5. Drying shrinkage

GCSGBX_2019_v19n1_59_f0014.png 이미지

Figure 6. Mass change ratio

Table 1. Experimental programs

GCSGBX_2019_v19n1_59_t0001.png 이미지

Table 2. Used materials

GCSGBX_2019_v19n1_59_t0002.png 이미지

Table 3. Relationship between pore size and drying shrinkage

GCSGBX_2019_v19n1_59_t0003.png 이미지

References

  1. Lee SY. Innovation of concrete technology through the value finding of blast furnace slag powder. Magazine of the Korea Concrete Institute. 2017 Dec;29(6):6-7.
  2. Architectural Institute of Japan. Recommendation for practice of concrete with portland cement and ground granulated blast-furnace slag. Tokyo(Japan): Architectural Institute of Japan; 2001. 70 p.
  3. NonomuraY, Shimata A, Shimada H, Yoshida S. A fundamental study on expansion of use of frost-resistant accelerator for blast furnance slag cement. Hokkaido(Japan): Civil Engineering Research Institute for Cold Region; 2015 Oct 45-50 p. Report No.:749.
  4. AIJ. Recommendation for Practice of Cold Weather Concreting. Tokyo(Japan): Architectural Institute of Japan; 2010. 240 p.
  5. Taniguchi M, Nakamura T, Koike S, Nishi H. Study on effect and mechanism of accelerator for freeze protection. Hokkaido(Japan): Hokkaido Research Organization Northern Regional Building Research Institute; 2015 Mar. 1-11 p. Report No.:358.
  6. Hama Y, Kamada E. The properties of concrete containing a frost-resistant accelerator. Concrete Journal. 1999 Jan;37(11):3-8. https://doi.org/10.3151/coj1975.37.11_3
  7. Architectural Institute of Japan. Recommendations for Practice of Crack Control in Reinforced Concrete Buildings (Design and Construction). Tokyo(Japan): Architectural Institute of Japan; 2006. 17-24 p.
  8. Japan Concrete Institute. Research committee report on shrinkage of concrete. Tokyo(Japan): Japan Concrete Institute; 2010. 81-2 p.
  9. KS F 2405. Standard test method for compressive strength of concrete. Seoul(Korea): Korean Agency for Technology and Standards; 2017. 1-7 p.
  10. JIS S 009-2012. Method of test for restrained expansion of expansive concrete using a cylindrical mold. Tokyo(Japan): Japan Industrial Standards; 2012. 1-3 p.
  11. KS F 2424. Testing method for length change of mortar and concrete. Seoul(Korea): Korean Agency for Technology and Standards; 2015. 1-11 p.
  12. Narumi R, Zhang W, Kishimoto Y, Hama Y. Investigation of affecting factors on reductance of drying shrinkage and degaradation of frost resistance of mortar with shrinkage reducing agent. Journal of Structural and Construction Engineering (Transactions of AIJ). 2014 Jul;72(700):671-80.
  13. Maria CGJ, Hamlin MJ. Examining the relationship between the microstructure of calcium silicate hydrate and drying shrinkage of cement paste. Cement and Concrete Research. 2002 Feb;32(2):289-96. https://doi.org/10.1016/S0008-8846(01)00673-1
  14. Knut O.K., Elisabeth H.A., Pore structure of cement silicafume systems presence of hollow-shell pores. Cement and Concrete Research. 1999 Jan;29:133-42. https://doi.org/10.1016/S0008-8846(98)00166-5
  15. Rosa ME, Lutz F. Influence of the age and drying process on pore structure and sorption isotherm of hardened cement paste. Cement and Concrete Research. 2006 Oct;36:1969-84. https://doi.org/10.1016/j.cemconres.2006.06.010
  16. KS F 2562. Expansive additive for concrete. Seoul(Korea): Korean Agency for Technology and Standards; 2014. 1-19 p.
  17. Choi HG, Kim GY, Noguchi T, Hama Y. Estimation of Shrinkage Behavior and Stress of Expansive Concrete on Buildings. Journal of the Korea Concrete Institute. 2016 Feb;28(1):23-31. https://doi.org/10.4334/JKCI.2016.28.1.023