Abstract
Durability represents a crucial issue for evaluating safety and serviceability of reinforced concrete structures. Many studies have already focused on carbonation-induced corrosion of natural aggregate concrete (NAC) structures, leading to several prediction models to estimate carbonation depth. Less research is devoted instead on recycled aggregate concrete (RAC), about which limited experimental works exist aimed at assessing the carbonation coefficient in accelerated tests. Additionally, deteriorating processes are subject to uncertainty, when defining materials, geometry, and environmental actions during the service life of structures. This work presents a reliability-based analysis of carbonation resistance of RACs, using experimental carbonation coefficients derived from the literature, and applied in the full-probabilistic method prosed in fib Bulletin 34. Results demonstrate how aggregates replacement ratio and w/c ratio influence the reliability of RAC carbonation resistance.
Highlights
Reinforced concrete (RC) structures suffer deterioration processes, due to several concurring causes linked to material defects, poor design and workmanship operations, environmental and physical actions, and inadequate maintenance over time
Less research is devoted instead on recycled aggregate concrete (RAC), about which limited experimental works exist aimed at assessing the carbonation coefficient in accelerated tests
Deteriorating processes are subject to uncertainty, when defining materials, geometry, and environmental actions during the service life of structures. is work presents a reliability-based analysis of carbonation resistance of RACs, using experimental carbonation coefficients derived from the literature, and applied in the full-probabilistic method prosed in fib Bulletin 34
Summary
Reinforced concrete (RC) structures suffer deterioration processes, due to several concurring causes linked to material defects, poor design and workmanship operations, environmental and physical actions, and inadequate maintenance over time. The full-probabilistic fib model is used to evaluate the reliability of RAC carbonation resistance, taking into account, as significant parameters, aggregate replacement ratio and water/cement (w/c) ratio.
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