Browse > Article
http://dx.doi.org/10.4334/JKCI.2013.25.1.003

Mechanism of Strength Development in Ultra High Strength Concrete Using the Electric Arc Furnace Oxidizing Slag as Fine Aggregate  

Lee, Seung-Heun (Dept. of Materials Science and Engineering, Kunsan National University)
Lim, Doo-Sub (Dept. of Materials Science and Engineering, Kunsan National University)
Lee, Seung-Hoon (Samsung C&T Corporation Engineering & Construction Group)
Lee, Joo-Ha (Dept. of Civil Engineering, The University of Suwon)
Publication Information
Journal of the Korea Concrete Institute / v.25, no.1, 2013 , pp. 3-9 More about this Journal
Abstract
In ultra high strength concrete, when electric arc furnace oxidizing slag is substituted for sea sand as fine aggregate, compressive strength was improved about 15 MPa. To figure out the cause of the improvement in compressive strength, this study considered the dissolution characteristics of Ca component in fine aggregate and examined the microstructure, porosity, microhardness, and Ca/Si mole ratio on the interface of fine aggregate and paste. And to examine the mechanism of strength improvement resulted from the shape of fine aggregate, this study measured the surface roughness of fine aggregate with AFM. According to the result of this experiment, the mechanisms of strength improvement in ultra high strength concrete resulted from the use of electric arc furnace oxidizing slag as fine aggregate can be divided into chemical and physical mechanisms. In the chemical mechanism, the soluble Ca component contained in electric arc furnace oxidizing slag is dissolved and forms a hydrate between fine aggregate and paste to improve the interlocking strength of fine aggregate-paste. Also, it makes the microstructure around the fine aggregate. And in the physical mechanism, electric arc furnace oxidizing slag has a twice greater surface roughness than sea sand, so the interlocking strength between fine aggregate and paste increases, which contributes to the development of compressive strength.
Keywords
ultra high strength concrete; mechanism of strength development; fine aggregate; electric arc furnace oxidizing slag; sea sand;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Bache, H. H., "Densified Cement/Ultra Fine Particles Based Materials," The 2nd International Conference on Superplasticizers in Concrete, Ottawa, Canada, 1981, pp. 1-35.
2 Matte, V. and Moranville, M., "Durability of Reactive Powder Composites: Influence of Silica Fume on the Leaching Properties of Very Low Water/Binder Pastes," Cement and Concrete Composites, Vol. 21, Issue 1, 1999, pp. 1-9. (doi: http://dx.doi.org/10.1016/S0958-9465(98)00025-0)   DOI   ScienceOn
3 Mino, I. and Sakai, E., "Engineering Concrete," Proceedings of the MRS International Meeting on Advanced Materials, Tokyo, Japan, Vol. 13, 1989, pp. 247-254.
4 Monteiro, P. J. M., Maso, J. C., and Ollivier, J. P., "The Aggregate-Mortar Interface," Cement and Concrete Research, Vol. 15, Issue 6, 1985, pp. 953-958. (doi: http://dx.doi.org/10.1016/0008-8846(85)90084-5)   DOI   ScienceOn
5 Zimbelman, R. A. "Contribution to the Problem of Cement- Aggregate Bond," Cement and Concrete Research, Vol. 15, Issue 5, 1985, pp. 801-808. (doi: http://dx.doi.org/10.1016/0008-8846(85)90146-2)   DOI   ScienceOn
6 Scrivener, K. L. and Nemati, K. M., "The Percolation of Pore Space in the Cement Paste/Aggregate Interfacial Zone of Concrete," Cement and Concrete Research, Vol. 26, Issue 1, 1996, pp. 35-40. (doi: http://dx.doi.org/10.1016/0008-8846(95)00185-9)   DOI   ScienceOn
7 Diamond, S., "Consideration in Image Analysis as Applied to Investigations of the ITZ in Concrete," Cement and Concrete Composites, Vol. 23, Issue 2-3, 2001, pp. 171-178. (doi: http://dx.doi.org/10.1016/S0958-9465(00)00085-8)   DOI   ScienceOn
8 Prokopski, G. and Halbiniak, J., "Interfacial Transition Zone in Cementitious Materials," Cement and Concrete Research, Vol. 30, Issue 4, 2000, pp. 579-583. (doi: http://dx.doi.org/10.1016/S0008-8846(00)00210-6)   DOI   ScienceOn
9 Tullin, A., Mustafa, T., and Tahir, C., "Effect of Coarse Aggregate Size and Matrix Quality on ITZ and Failure Behavior of Concrete under Uniaxial Compression," Cement and Concrete Composites, Vol. 26, Issue 6, 2004, pp. 633-638. (doi: http://dx.doi.org/10.1016/S0958-9465(03)00092-1)   DOI   ScienceOn
10 Zimbelman, R., "A Contribution to the Problem of Cement- Aggregate Bond, " Cement and Concrete Research, Vol. 15, Issue 5, 1985, pp. 801-808. (doi: http://dx.doi.org/10.1016/0008-8846 (85)90146-2)   DOI   ScienceOn
11 Yi, N. H., Kim, J. H. J., Han, T. S., Cho, Y. G., and Lee, J. H., "Blast-Resistant Characteristics of Ultra-High Strength Concrete and Reactive Powder Concrete," Construction and Building Materials, Vol. 28, Issue 1, 2012, pp. 694-707. (doi: http://dx.doi.org/10.1016/j.conbuildmat.2011.09.014)   DOI   ScienceOn
12 Michael, S. and Ekkehard, F., "Ultra High Performance Concrete: Research, Development and Application in Europe," Proceedings of the 7th International Symposium on the Utilization of UHS/HPC, Washington DC, 2005, pp. 51-77.