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Micro-Mechanical Analysis Of Corrosion Products Formed During Long-Term Carbonation Induced Corrosion Of Steel, Marijana Serdar, Dubravka Bjegovic, Valérie L’Hostis, Stéphane Poyet, Damien Féron
Micro-Mechanical Analysis Of Corrosion Products Formed During Long-Term Carbonation Induced Corrosion Of Steel, Marijana Serdar, Dubravka Bjegovic, Valérie L’Hostis, Stéphane Poyet, Damien Féron
International Conference on Durability of Concrete Structures
During corrosion distinct types of corrosion products form, composed of different ratios of ferrous ions and oxide, hydroxides. Corrosion products have different physical and mechanical properties, mainly density, resistivity, volume and modulus of elasticity compared to iron. Knowing properties of corrosion products is indispensable for service life modelling of structures and can give valuable insight into the long-term corrosion propagation process. In this study micro-indentation method was used to evaluate mechanical properties of different layers formed during long-term carbonation induced corrosion of steel in concrete. Investigation was performed on three sets of reinforced concrete samples, that underwent corrosion during 50, …
Load-Bearing Capacity Of Corroded Reinforced Concrete Structures Caused By Carbonation And Exposed To Xc4, Esko Sistonen
Load-Bearing Capacity Of Corroded Reinforced Concrete Structures Caused By Carbonation And Exposed To Xc4, Esko Sistonen
International Conference on Durability of Concrete Structures
Concrete corrosion can be visualized as a combination of chemical reaction on concrete and electrochemical reaction on steel reinforcement. Failure of steel reinforcement due to corrosion can inflict significant stress on concrete during load distribution. As such, it is necessary to analyse the long-term effects of corrosion on the load bearing capacity and bending strength of steel reinforcement. This research investigated the mechanical and electrochemical properties of concrete exposed to long-term corrosion for a period of 16 years. Non-destructive testing like crack width measurements, visual examination, electrochemical measurements using Galva Pulse and determination of average chloride content were undertaken to …
Influence Of Cracks On The Carbonation Resistance Of Concrete Structures, Abbas Al-Ameeri Mr., Muhammed Imran Rafiq Dr., Orania Tsioulo Dr.
Influence Of Cracks On The Carbonation Resistance Of Concrete Structures, Abbas Al-Ameeri Mr., Muhammed Imran Rafiq Dr., Orania Tsioulo Dr.
International Conference on Durability of Concrete Structures
Carbonation-induced corrosion of steel rebar embedded in concrete is one of the major issues influencing durability of reinforced concrete structures. It has been acknowledged that structural cracks in concrete influences the carbon dioxide (CO2) diffusivity and accelerates the carbonation-induced reinforcement corrosion, however most of the previous studies on the carbonation induced corrosion have concentrated on the un-cracked / unloaded concrete. This study investigates the impact of cracks caused by loading on the depth of carbonation into concrete. Concrete prisms (100x100x500 mm) were subjected to four different crack widths (0, 0.05-0.15 mm, 0.15-0.25 mm and 0.25-0.35 mm) and the …
Climate Resilient Concrete Structures In Marine Environment Of Bangladesh, Sudarshan Srinivasan, Ian Gibb
Climate Resilient Concrete Structures In Marine Environment Of Bangladesh, Sudarshan Srinivasan, Ian Gibb
International Conference on Durability of Concrete Structures
Bangladesh has a vast coastal infrastructure seriously affected by climate change and associated extreme environmental conditions. The rural construction sector in Bangladesh will be undergoing rapid growth in the next 10 years through rural infrastructure development programmes funded by the Asian Development Bank and the World Bank. The Local Government Engineering Department (LGED in Bangladesh), owns the rural concrete infrastructure, maintains around 380, 000 linear metres of concrete bridges or culverts in the rural coastal areas and are planning to build more than 200,000 linear metres during the next ten years. In order to design and construct durable concrete structures …
Estimated Service Life Of Carbonation Exposed (Cracked) Concrete With Pozzolans Or Self-Healing Agents, Philip Van Den Heede, Nele De Belie
Estimated Service Life Of Carbonation Exposed (Cracked) Concrete With Pozzolans Or Self-Healing Agents, Philip Van Den Heede, Nele De Belie
International Conference on Durability of Concrete Structures
Today, concrete with large portions of ordinary Portland cement (OPC) replaced by fly ash and self-healing concrete count as potential sustainable alternatives to traditional concrete. For the first concrete type, the increased sustainability lies in lowering the carbon footprint which is largely attributable to cement. For the second one that should be able to heal cracks autonomously upon occurrence, an extended service life is the key objective. In this paper, both concrete types were evaluated in terms of service life in carbonation exposed environments. When using the probabilistic model for carbonation-induced steel depassivation of fib Bulletin 34 with mix specific …
New Model For Natural Carbonation Prediction In Reinforced Concrete – Concept And Validation On Chemical Admixtures, Stephen O. Ekolu, M Raats
New Model For Natural Carbonation Prediction In Reinforced Concrete – Concept And Validation On Chemical Admixtures, Stephen O. Ekolu, M Raats
International Conference on Durability of Concrete Structures
A new model for prediction of natural carbonation in reinforced concrete structures has recently been developed and presented in (Ekolu, 2018). For brevity, the model is referred to as ESS model. It employs concrete strength as the primary property depicting core carbonation behaviour of any given concrete while other factors induce secondary influence. Chemical admixtures in concrete significantly influence concrete behaviour. Using experimental data from the literature (Dan-Herrera et al., 2015), the model behaviour is verified under use of various types of chemical admixtures of concrete including internal curing, shrinkage reducing, viscosity modifying, and high range water reducing admixtures. Class …
Performance Of Concrete Made With A Calcined Clay – Limestone-Portland Cement Exposed To Natural Conditions, Fernando Martirena, Ernesto Díaz, Dayran Rocha, Hamed Maraghechi, Karen Louise Scrivener
Performance Of Concrete Made With A Calcined Clay – Limestone-Portland Cement Exposed To Natural Conditions, Fernando Martirena, Ernesto Díaz, Dayran Rocha, Hamed Maraghechi, Karen Louise Scrivener
International Conference on Durability of Concrete Structures
This work presents the results of an investigation carried out to assess durability of concrete made with a calcined clay- limestone-Portland cement with 47% of clinker, hereafter named LC3, produced during an industrial trial in 2013. LC3 was used to cast concrete blocks and later expose them at a natural location at the northern coast of Cuba. Reference concrete was cast with Cuban Portland cement having 88% of clinker. Throughout three years (2015, 2016, 2017) concrete cores were systematically taken and the specimens were subjected to a testing program that included Formation factor, chloride profiling, surface resistivity, air permeability and …
Durability Properties Of High Performance Concrete Containing High Volumes Of Supplementary Cementitious Materials, Ayub Elahi, Sa Barbhuiya
Durability Properties Of High Performance Concrete Containing High Volumes Of Supplementary Cementitious Materials, Ayub Elahi, Sa Barbhuiya
International Conference on Durability of Concrete Structures
An experimental study was conducted to evaluate the performance of high performance non-air entrained concrete containing various supplementary cementitious materials. Concrete was prepared for constant value of slump and water-binder ratio. Fresh properties were determined in terms of slump and air content, whereas, hardened properties were investigated in terms of mechanical and durability tests. The maximum carbonation depth observed for concrete exposed for a period of sixteen weeks containing 40% pulverized fuel ash and 7.5% microsilica was about 5 mm. The non-steady state migration and diffusion coefficient of concrete containing different type of supplementary cementitious materials were observed to be …