This paper focuses on methodological issues relevant to corrosion risk prediction models. A model was developed for the of rates associated with hot-dip galvanised reinforcement bar material in concrete exposed carbonation and chlorides outdoor environment. One-year follow-up experiments, over five years, were conducted at various depths chloride contents. The observed dependence rate depth con...

Replacing Portland cement clinker partially with limestone powder offers economic and ecological benefits but may decrease the resistance against carbonation. The diffusivity of carbon dioxide moisture conditions in concrete significantly influence carbonation rate. Thus a test method was developed to determine effective CO2 diffusion coefficient (DCO2). Additionally, water vapour coefficients ...

Under badly environmental conditions as well as complex loads, corrosion of embedded reinforcing steel bars in concrete is common for reinforced concrete (RC) structures. Fatigue of corrosion reinforcing steel bars is a key problem for old RC bridges. To assess the residual fatigue life of aged existing RC bridges, the most new study information on fatigue of natural corrosion reinforcement is ...

We study the large-time behavior of the free boundary position capturing the one-dimensional motion of the carbonation reaction front in concrete-based materials. We extend here our rigorous justification of the √ t-behavior of reaction penetration depths by including non-linear effects due to deviations from the classical Henry’s law and time-dependent Dirichlet data.

Abstract Carbonation is a key mechanism for deterioration of reinforced concrete structures. In design resistance to carbonation, the performance mixes often specified and measured in laboratory carbonation tests where initial sometimes present specimens. The coherent interpretation results from vital as they enable more accurate prediction structures situ. This paper assesses two different app...

This paper describes the non-uniform corrosion characteristics and mechanical properties of reinforcement under coupled action of carbonation and static loading. The two parameters, namely area-box (AB) value and arithmetical mean deviation (Ra), are adopted to characterize the corrosion morphology and pitting distribution from experimental observations. The results show that the static loading...

Based on meso-damage mechanics and finite element analysis, the aim of this paper is to describe the feasibility of the Gurson-Tvergaard-Needleman (GTN) constitutive model in describing the tensile behavior of corroded reinforcing bars. The orthogonal test results showed that different fracture pattern and the related damage evolution process can be simulated by choosing different material para...

Carbon dioxide can react with alkaline carbonate substances in cement-based materials, which harms the durability of concrete structure. The carbonation reaction is a process releasing water, resulting an increase pore water saturation, was always neglected by previous studies. In this paper, transient saturation equation proposed and introduced into classical kinetic model, simulated finite-el...

Problem statement: Natural weathering is the most economic method of treatment in order to reduce the release of heavy metals present in the residue. Approach: The aim of the study was to optimize the minimum weathering times that were useful to reduce the lead release to within the Italian limits for landfill disposal. The mechanism of short-term weathering of MSWI bottom ash had been studied ...

Carbon dioxide (CO2) capture and sequestration includes a portfolio of technologies that can potentially sequester billions of tonnes of CO2 per year. Mineral carbonation (MC) is emerging as a potential CCS technology solution to sequester CO2 from smaller/medium emitters, where geological sequestration is not a viable option. In MC processes, CO2 is chemically reacted with calcium- and/or magn...