Carbonation modelling for concrete structures CoMSIRU

Carbonation modelling for concrete structures CoMSIRU

Carbonation modelling for concrete structures. The deterioration of concrete structures by environmental actions has become a great concern for engineering design and maintenance. In recent years the cases of unsatisfactory durability of concrete structures has increased at an alarming rate. In most cases, corrosion of the reinforcing steel in ...

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Carbonation service life modelling of RC structures for ...

Mar 01, 2013  The presented work aims at studying the modelling of long term performance of concrete compositions with different proportions of clinker as regards the diffusion of CO 2 in concrete – carbonation. The replacing constituents of clinker that will be part of the binder in each concrete composition are limestone filler and low calcium fly ash (FA).

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Carbonation modelling for cement-based materials ...

Dec 30, 2019  Thus, it may help to design and predict the service life of reinforced-concrete structures. 2. Model development. Before a practical carbonation model for cement-based materials built based on several published works is presented, the following assumptions are made. (1)

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Modeling carbonation for corrosion risk prediction of ...

Jun 01, 2002  Damage of reinforced concrete structures is often caused by corrosion of steel reinforcements due to carbonation. Although literature on carbonation has become vast, a comprehensive numerical model for quantitative prediction of the corrosion risk that allows for environmental influences such as temperature and humidity seems lacking.

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Statistical modelling of carbonation in reinforced concrete

Jul 01, 2014  In the model proposed for the second sample (RH > 70%) it is found that the variables considered by ranking of relevance are: the CO 2 content of the exposure environment; the clinker content; and the concrete 28-day compressive strength. Table 6 presents the summary of the model, showing that 91.7% of the variability of the carbonation coefficient is explained by the three variables ...

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Overview CoMSIRU

Topic: Carbonation modelling for concrete structures . Philemon Arito. Email: [email protected] Topic: The interaction between concrete mix design parameters and constituents and cracking in concrete patch repair materials. Moses Kiliswa. Email: [email protected] Topic: The influence of sewer parameters on the deterioration of ...

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Modelling and simulation of concrete carbonation ...

Concrete carbonation, i.e. the reaction of alkaline species (inside the concrete) with at-mospheric carbon dioxide, is one of the major physicochemical processes compromising the service life of concrete structures. While the main carbonation reaction is that of calcium hy-

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Carbonation service life modelling of RC structures for ...

Mar 01, 2013  The presented work aims at studying the modelling of long term performance of concrete compositions with different proportions of clinker as regards the diffusion of CO 2 in concrete – carbonation. The replacing constituents of clinker that will be part of the binder in each concrete composition are limestone filler and low calcium fly ash (FA).

get price

Overview CoMSIRU

Topic: Carbonation modelling for concrete structures . Philemon Arito. Email: [email protected] Topic: The interaction between concrete mix design parameters and constituents and cracking in concrete patch repair materials. Moses Kiliswa. Email: [email protected] Topic: The influence of sewer parameters on the deterioration of ...

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CONCRETE MATERIALS AND STRUCTURAL INTEGRITY ... -

CoMSIRU takes as a foundational philosophy the importance of developing high-level human resources for industry, academia and research. ... Deterioration studies on concrete structures. - 4 - ... model based on Carbonation induced Corrosion for South African Conditions. Anticipated

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University

appropriate carbonation prediction model. While South Africa has developed carbonation durability prediction models that can predict the performance of conventional concrete mixes (concrete containing 30% fly ash, 50% slag, 10% silica fume) relatively well, this formulation of the carbonation model was instituted approximately twenty

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Service life design and modelling of concrete structures ...

Mar 21, 2018  For carbonation models, the carbonation resistance of concrete is usually found from accelerated carbonation tests typically using laboratory-cured specimens. By contrast, the North American “LIFE-365” model is based on computer simulations and does not involve testing.

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Faculty of Engineering the Built Environment University ...

CoMSIRU CPD Courses 2018 ... of concrete structures. Over the last decade, there has been a marked focus on research into infrastructure performance, largely in response to industry needs. The unit also provides consultancy and postgraduate teaching in the areas of concrete material ... test procedures and prediction models for concrete properties.

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5-days Technical Workshop, July 2015 Condition Assessment ...

include concrete durability, performance assessment of concrete structures, repair systems for concrete structures, and bonded concrete overlays. Dr. James Mackechnie is based in Christchurch, New Zealand where he works for Allied Concrete and is an adjunct researcher at

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ANNUAL REPORT - Dashboard

innovation in concrete materials, durability and integrity of concrete structures. To this end we are pursuing work on developing new cements, developing new repair materials and applications of artificial intelligence and machine learning in structural integrity assessment. CoMSIRU values and appreciates continued industry support.

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Repair and Rehabilitation of Concrete Structures

condition assessment of concrete structures and concrete repair and strengthening methods. A large number of concrete structures are deteriorating, often prematurely, and need remedial measures to reinstate their safety and/or serviceability. Consequently, the need for repair and protection has grown considerably in recent years.

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Browsing Theses / Dissertations by Department "Concrete ...

Author: Chibulu, Chizya Date: 2016 The concrete repair industry is driven by deterioration of, damage to, and defects in concrete structures. The impact of deterioration or damage is a reduction in the service life of the concrete structure.

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multifunction asphalt distributor bitumen sprayer

china 5m3 standard asphalt distributor 5000l bitumen sprayer. china 5m3 standard asphalt distributor 5000l bitumen sprayer. Shanghai Doan Machinery Technology Co.,Ltd is a road repair machine manufacturing factory ,which is specialized in manufacturing Asphalt Distributor,Crack Router,Crack Sealing Machine,Chip Spreader,road roller,Asphalt Mixing Plant ,etc. we own dozens of advanced ...

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Carbonation depth model and carbonated acceleration rate ...

Nov 01, 2020  Effects of temperature, relative humidity and CO 2 concentration on carbonation depth of concrete were investigated, and the variation laws of concrete carbonation depth under coupling effects of environment factors were also studied. A novel prediction model of carbonation depth including component materials and environment factors was proposed on basis of the measured data.

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Modeling carbonation for corrosion risk prediction of ...

The aim of the present paper is the development of a theoretical model to predict carbonation of concrete structures. The model describes movement and retention of heat, moisture and carbon ...

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Towards practical carbonation prediction and modelling for ...

data source. This paper attempts to identify the reasons for lack of practical carbonation prediction models and articulates on the important considerations in developing prediction models. 2. A future of carbonation 2.1. Historical perspective Carbonation of concrete structures is a direct result of the increase in green house gas emissions in the

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Modelling of carbonation of reinforced concrete structures ...

Modelling of carbonation of reinforced concrete structures in intramuros, manila using artificial neural network July 2017 International Journal of GEOMATE 13(35):87-92

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Service life design and modelling of concrete structures ...

Mar 21, 2018  For carbonation models, the carbonation resistance of concrete is usually found from accelerated carbonation tests typically using laboratory-cured specimens. By contrast, the North American “LIFE-365” model is based on computer simulations and does not involve testing.

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Analysis of correlation between real degradation data and ...

Jan 01, 2019  The carbonation model provides a valuable perspective on how the carbonation front advances over time through concrete structures under the influence of climate change. This research shows this behaviour with the expected degradation in RC structures of Paraguay for the climate scenarios RCP 4.5 (best case) and RCP 8.5 (worst case).

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Modelling steel corrosion in concrete structures ...

Jun 08, 2006  Isgor OB, Razaqpur AG (2004) FE modelling of coupled heat transfer, moisture transport and carbonation processes in concrete structures. Journal of Cement and Concrete Composites 26:57–73. Article Google Scholar 8. Thomas MDA, Bamforth PB (1999) Modelling chloride diffusion in concrete: Effect of fly ash and slag.

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Assessing the Influence of crack width on the durability ...

(CoMSIRU) ASSESSING THE INFLUENCE OF CRACK WIDTH ON THE ... Durability is a major concern for reinforced concrete (RC) structures. RC structures both in service and new, are ... 2.4 Corrosion of steel in concrete 16 2.5 Carbonation-induced corrosion of steel in concrete 17

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Faculty of Engineering the Built Environment University ...

CoMSIRU CPD Courses 2018 ... of concrete structures. Over the last decade, there has been a marked focus on research into infrastructure performance, largely in response to industry needs. The unit also provides consultancy and postgraduate teaching in the areas of concrete material ... test procedures and prediction models for concrete properties.

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TECHNICAL PAPER A step towards standardising JOURNAL OF ...

leadership of CoMSIRU (Concrete Materials Structural Integrity Research Unit) at UCT. His research area is structural health monitoring and condition assessment of structures. He regularly acts as a specialist consultant to industry on vibration serviceability problems, dynamic analysis and dynamic based assessment of structures. Contact details:

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University of Cape Town

Service life models for predicting chloride ingress and carbonation in the patch repair mortars used in this study were developed based on modified Fickian equations. The prediction

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Estimation of Concrete Carbonation Depth Considering ...

In reinforced concrete (RC) structures, the carbonation depth is a key deterioration factor to determine the durability of concrete structures [1–4]. In the initial stage of construction, RC members exhibit strong alkalinity of about pH 12-13 due to the calcium hydroxide inside the concrete, and a protective passive film is formed on the ...

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Repair and Rehabilitation of Concrete Structures

condition assessment of concrete structures and concrete repair and strengthening methods. A large number of concrete structures are deteriorating, often prematurely, and need remedial measures to reinstate their safety and/or serviceability. Consequently, the need for repair and protection has grown considerably in recent years.

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(PDF) Quality control of reinforced concrete structures ...

(1) Concrete Materials and Structures Integrity Research Unit (CoMSIRU), Department of Civil Engineering, University of Cape Town, South Africa - [email protected] Abstract

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