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http://dx.doi.org/10.14190/JRCR.2019.7.2.109

Quantification of Chloride Diffusivity in Steady State Condition in Concrete with Fly Ash Considering Curing and Crack Effect  

Yoon, Yong-Sik (Department of Civil Engineering, Hannam University)
Cheon, Ju-Hyun (Construction Technology Research Center, Korea Conformity Laboratories)
Kwon, Seung-Jun (Department of Civil Engineering, Hannam University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.7, no.2, 2019 , pp. 109-115 More about this Journal
Abstract
In case of the cracks in concrete, the penetration of deterioration ions such as chloride ions in to cracks is accelerated. According to the penetration of chloride ions, structural and durability problems to RC(Reinforced Concrete) structures are caused. In this study, the accelerated chloride diffusion coefficient which is in steady state is evaluated for 2 year aged normal and high strength FA(Fly Ash) concrete, after a range of crack depths are induced up to 1.0 mm in 56 aged day. Considering crack effect by linear regression analysis, high strength concrete has slightly less increasing ratio of diffusion coefficient by crack than normal strength concrete, and diffusion coefficient increases non-linearly as crack width is increased. Also, In two types of concrete, crack effect decrease as the curing period increase. In the case of quantifying crack and curing effect by using exponential function form, the coefficients of determination are higher than those of linear regression analysis. Under steady state, it is thought that there is not a high correlation between the crack effect and the curing effect, and considering the two independent effects, it is believed that reasonable prediction equation for diffusion of concrete with crack can be proposed.
Keywords
Fly ash; Chloride diffusion coefficient; Crack; Time-dependent;
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Times Cited By KSCI : 3  (Citation Analysis)
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1 Cheon, J.H., Ryu, H.S., Yoon, Y.S., Kwon, S.J. (2017). Crack and time effect on chloride diffusion coefficient in nuclear power plant concrete with 1 year curing period, Journal of the Korea Institute for Structural Maintenance and Inspection, 21(6), 83-90 [in Korean].   DOI
2 Chung, L., Jay Kim, J.H., Yi, S.T. (2008). Bond strength prediction for reinforced concrete members with highly corroded reinforcing bars, Cement and Concrete Composites, 30(7), 603-611.   DOI
3 Gerard, B., Marchand, J. (2000). Influence of cracking on the diffusion properties of cement-based materials Part I: Influence of continuous cracks on the steady-state regime, Cement and Concrete Research, 30(1), 37-43.   DOI
4 JSCE. (2002). Concrete Library 109: Proposal of the Format for Durability Database of Concrete, Japan Society of Civil Engineering (JSCE), Tokyo, Japan.
5 JSCE. (2007). Standard Specification for Concrete Structures- Design; JSCE Guidelines for Concrete 15, Japan Society of Civil Engineering (JSCE), Tokyo, Japan.
6 Jung, S.H., Ryu, H.S., Karthick, S., Kwon, S.J. (2017). Time and crack effect on chloride diffusion for concrete with fly ash, International Journal of Concrete Structures and Materials, 2018, 1-10.
7 Kim, D.S., Lee, S.T., Lee, S.H., Kim, D.G., Seo, C.W., Ryu, D.H. (2009). "Strength and diffusivity of ternary cement concrete using pulverized fly ash," Academic conference of Korea Concrete Institute, KCI, Seoul, Korea, 255-256 [in Korean].
8 Kwon, S.O., Bae, S.H., Lee, H.J., Jung, S.H. (2014). Characteristics for reinforcement corrosion and chloride ion diffusion of high volume fly ash concrete, Journal of the Korean Recycled Construction Resources Institute, 2(1), 34-39 [in Korean].   DOI
9 Maekawa, K., Ishida, T., Kishi, T. (2009). Multi-Scale Modeling of Structural Concrete, Taylor & Francis, London, England.
10 Lee, M.H. (2016). Fundamental Properties of mortar and concrete using high calcium fly ash, Journal of the Korean Recycled Construction Resources Institute, 4(3), 284-291 [in Korean].   DOI
11 Nath, P., Sarker, P. (2011). Effect of fly ash on the durability properties of high strength concrete, Procedia Engineering, 14, 1149-1156.   DOI
12 Neville, A.M. (1995). Properties of Concrete fourth edition, Longman Group, London, England.
13 Park, S.S., Kwon, S.J., Jung, S.H. (2012a). Analysis technique for chloride penetration in cracked concrete using equivalent diffusion and permeation, Construction and Building Materials, 29, 183-192.   DOI
14 Park, S.S., Kwon, S.J., Jung, S.H., Lee, S.W. (2012b). Modeling of water permeability in early aged concrete with cracks based on micro pore structure, Construction and Building Materials, 27(1), 597-604.   DOI
15 Park, S.S., Song, H.W., Byun, K.J. (2001). Model for chloride diffusivity and water permeability in cracked concrete, Journal of the Korean Society of Civil Engineers, 21(6A), 915-924 [in Korean].
16 Song, H.W., Cho, H.J., Park, S.S., Byun, K.J., Maekawa, K. (2001). Early-age cracking resistance evaluation of concrete structure, Concrete Science Engineering, 3(10), 62-72.
17 Broomfield, J.P. (1997). Corrosion of Steel in Concrete: Understanding, Investigation and Repair, E&FN, London, England, 1-15.
18 Win, P.P., Watanabe, M., Machida, A. (2004). Penetration profile of chloride ion in cracked reinforced concrete, Cement and Concrete Research, 34(7), 1073-1079.   DOI
19 Zhou, Z., He, J.P., Chen, G.D., Ou, J.P. (2009). A smart steel strand for the evaluation of prestress loss distribution in post tensioned concrete structures, Journal of Intelligent Material Systems and Structures, 20(16), 1901-1912.   DOI
20 Andrade, C. (1993). Calculation of chloride diffusion coefficients in concrete from ionic migration measurement, Cement and Concrete Research, 23(3), 724-742.   DOI