Abstract
This paper provides a literature review and analysis of the various influencing aspects related to the use of recycled aggregates, sourced from construction and demolition waste, on the chloride ion penetration of concrete. A statistical analysis on the effect of incorporating increasing amounts of recycled aggregates of different type, size, and class on the chloride ion migration and total charge passed of concrete is also presented. The paper also presents the relationship between these properties and the corresponding compressive strength. The results show strong correlations between these parameters, which are independent of other aspects related to recycled aggregate use and made it possible obtaining a relationship between the values acquired via NT Build 492 and ASTM C1202.
Highlights
The expansion of the world’s population has led to an exponential increase in the consumption of natural resources and energy, leading to increasing amounts of waste
The 95% lower confidence limit (95% LCL) in Figure 1b suggests that the use of fine RA may significantly increase resistance to chloride ion penetration, further analysis of the results showed that this only happened when using fine recycled masonry aggregates (RMA)
For reinforced concrete exposed to environmental class XS3, the use of admixtures which enhance the concrete performance against chloride penetration is foreseen, either for natural aggregate concrete (NAC) or recycled aggregate concrete (RAC)
Summary
The expansion of the world’s population has led to an exponential increase in the consumption of natural resources and energy, leading to increasing amounts of waste. The use of recycled aggregates (RA), as replacement for natural aggregates (NA), in construction applications has The aim of this investigation was to analyse the various influencing aspects related to the use of RA, sourced from construction and demolition waste, on the chloride ion penetration of concrete. With the purpose of understanding the effect of introducing an increasing amount of RA on the resistance to chloride ion penetration, a statistical analysis was performed on data gathered from several studies. It was the authors’ objective to produce a generic prediction model that yields concrete’s chloride migration coefficient and total charge passed as a function of the corresponding compressive strength
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