STUDIES ON CARBONATION RATE OF CONCRETE : Part 1 Equation of carbonation rate and effects of constituents of concrete on carbonation rate

Izumi, Itoshi

doi:10.3130/aijsx.394.0_17

Cited by 1 publication

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“…These equations assume that carbonation depth is proportional to square root of exposed time. This assumption was verified through experiments, field investigations [1,2,9,22], and analytical solution [6,23]. In Table 1, carbonation parameters are summarized.…”

Section: Study Of Carbonation Parameters and Prediction Techniquesmentioning

confidence: 85%

“…concentration is increasing due to fossil energy consumption and this causes more carbonation damage to RC structures [1,2]. Carbonation means that pH in pore water drops to about 10.5 due to intrusion of exterior CO 2 [3] and consumption of CaOH 2 .…”

Section: Introductionmentioning

confidence: 99%

“…With higher CO 2 concentration, carbonation depth increases but this can be comparatively controlled by a design of concrete mix proportions. The influencing parameters on carbonation are reported to be type of cement, unit content of cement, type of aggregate, and so on [2]. Semiempirical prediction techniques, so-called mesolevel, have been proposed and they are still utilized for the sake of simple and practical application [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Concrete Mix Design for Service Life of RC Structures under Carbonation Using Genetic Algorithm

Kwon

Lee

Kim

2014

Advances in Materials Science and Engineering

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Steel corrosion in reinforced concrete (RC) structure is such a critical problem to structural safety that many researches have been performed for maintaining required performance during intended service life. This paper is for a numerical technique for obtaining optimum concrete mix proportions through genetic algorithm (GA) for RC structures under carbonation which is considered as a serious deterioration in underground sites and big cities. For this study, mix proportions and CO 2 diffusion coefficients are analyzed through the previous studies, and then the fitness function of CO 2 diffusion coefficient is derived through regression analysis. The fitness function from 69 test results includes 5 variables of mix proportions such as w/c (water to cement) ratio, cement content, sand content percentage, coarse aggregate content, and R.H. (relative humidity). Through GA technique, simulated mix proportions are obtained for 12 cases of verification and they show reasonable results with average relative error of 4.6%. Assuming intended service life and design parameters, intended CO 2 diffusion coefficients and cement contents are determined and then related mix proportions are simulated. The proposed technique can provide initial concrete mix proportions which satisfy service life under carbonation.

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Section: Study Of Carbonation Parameters and Prediction Techniquesmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Concrete Mix Design for Service Life of RC Structures under Carbonation Using Genetic Algorithm

Kwon

Lee

Kim

2014

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

STUDIES ON CARBONATION RATE OF CONCRETE : Part 1 Equation of carbonation rate and effects of constituents of concrete on carbonation rate

Cited by 1 publication

References 0 publications

Concrete Mix Design for Service Life of RC Structures under Carbonation Using Genetic Algorithm

Concrete Mix Design for Service Life of RC Structures under Carbonation Using Genetic Algorithm

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