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http://dx.doi.org/10.14190/JRCR.2021.9.3.236

Service Life Variation Considering Increasing Initial Chloride Content and Characteristics of Mix Proportions and Design Parameters  

Park, Sun-Kyung (Department of Civil and Environment Engineering, Hannam University)
Kwon, Seung-Jun (Department of Civil and Environment Engineering, Hannam University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.3, 2021 , pp. 236-245 More about this Journal
Abstract
It is very important for structure designer to understand the service life variation since a wide range of service life is evaluated with changing exposure conditions and design parameters. Recently, for zero-carbon, waste plastic has been used for fuel for clinker production and this yields increase in chloride content in cement. This study is for evaluation of changing service life in the concrete with increasing initial chloride content due to usage of plastic-SRF(Solid Refuse Fuel) considering various exposure conditions and design parameters. For this, 4 levels of initial chloride content were assumed, and the service life was assessed using LIFE 365 program considering various environmental conditions including 3 levels of surface chloride content. As for analysis parameters, critical/initial chloride content, blast furnace slag powder replacement ratio, W/B(Water to Binder) ratio, cover depth, and unit mass for binder are adopted. Service life decreases with increasing initial chloride content and a significant reduction of service life is not evaluated permitting up to 1,000ppm of initial chloride content. With increasing slag replacement ratio, a longer service life can be secured since blast furnace slag powder has the effect of reducing the diffusion of external chloride ions and fixing the free chloride. It is thought that increasing initial chloride content up to European standard is helpful for enhancing sustainability and reducing carbon emission. Though the reduction in service life due to an increase in the initial chloride content is not significant in slag-concrete with low surface chloride content, careful consideration for mixing design should be paid for the exposure environment with high surface chloride content.
Keywords
Zero-carbon; Service life; Blast furnace slag powder; Initial chloride content; SRF(Solid Refuse Fuel);
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