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concrete carbonation and chloride penetration in

Concrete carbonation and chloride penetration

2001-1-1  Laboratory studies have confirmed the overall acceleration of chloride ingress by carbonation following difference schemes [7] [8] [9] while the

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Carbonation and Chloride Penetration in Concrete Made

2006-9-1  This paper presents the main results of this research concerning carbonation and chloride penetration (by means of chloride migration

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Concrete carbonation and chloride penetration in

2020-3-3  Concrete carbonation and chloride penetration in a marine environment A. Costa and J. Appleton Instituto Superior Técnico, Technical University of Lisbon, Portugal. Costa, Appleton 243 Table 1 shows the composition and properties of the mixes used. The mix of shotcrete C3 relates to the shotcrete after it has been applied, i.e.after rebound losses.

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Carbonation Chloride Penetration of Concrete Structures

2021-4-21  Mechanism of Carbonation ¢Step 1 H20+C02 = HC03-+ H+ HC03 -= C0 3 2-+ H+ ¢Step 2 Ca(0H)2+ 2H++ C0 3 2- = CaC0= CaC03+2H200 ¢This neutralisation reaction penetrates gradually intothe concrete surface ¢Penetration Rate = k time1l2 1 l i l i l i l i l i l i

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Effects of Carbonation on Chloride Penetration in Concrete

2013-9-1  Under the marine environment, the penetration of chloride ions in reinforced concrete (RC) structures has been widely studied by coupling with moisture and

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EFFECT OF CARBONATION ON CHLORIDE PENETRATION

2020-3-3  carbonation on chloride penetration was also evaluated in this study. 1. Introduction Chloride ions ingress and carbonation, which start from concrete surface and progress toward internal concrete, can both lead to accelerated corrosion of steel bars in concrete. When chloride ions ingress and carbonation take place simultaneously in concrete,

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(PDF) Chloride Penetration into Carbonated Concrete

2016-5-10  Carbonation and chloride action are the two leading causes of degradation in reinforced concrete structures. Despite the combined action of these two mechanisms being a reality, there is little...

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Resistance of concrete to carbonation and chloride

The paper describes the main mechanisms of carbonation and chloride penetration into concrete and how the rate of penetration can be measured with laboratory tests. It is also discussed why nondestructive test (NDT) methods for measuring directly the resistance of aged field concrete to carbonation or chloride penetration are not available.

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Effects of Carbonation on Chloride Penetration in Concrete

2013-9-1  Therefore, the purpose of this study is to explore the influence of carbonation on chloride penetration in concrete structures. Several series of concrete specimens were tested. The test results indicate that the chloride penetration is more pronounced when the carbonation process is combined with the chloride ingress.

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Chloride Penetration in Coastal Concrete Structures: Field ...

2019-12-23  For concrete structures in the atmospheric environment, chloride penetration is affected by capillary absorption in the surface concrete and diffusion is the primary mechanism of chloride transport in the internal concrete [ 31 ]. Figure 3 shows the

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[PDF] Concrete carbonation and chloride penetration in a

Corpus ID: 108288689. Concrete carbonation and chloride penetration in a marine environment @inproceedings{CostaConcreteCA, title={Concrete carbonation and chloride penetration in a marine environment}, author={A. Costa and J. Appleton} }

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Concrete carbonation and chloride penetration in

2020-3-3  Concrete Science and Engineering, Vol. 3, December 2001, pp 242-249 ABSTRACT In an inspection and appraisal study of a series of 25-year-old concrete structures in a dockyard constructed with poor quality concrete, it was found that both chloride penetration and carbonation played a significant role in the deterioration of the

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Effects of Carbonation on Chloride Penetration in Concrete

2013-9-1  Keywords: carbonation; chloride penetration; chloride profile; fly ash. Date: 9/1/2013. Abstract: Previous studies were confined mostly to the deterioration of concrete structures under a single deteriorating factor, such as chloride ingress only or carbonation only, although the real environment may be a combination of such factors.

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Quantitative estimation of carbonation and chloride

The apparent diffusion coefficient, which is one of the most important parameters for chloride penetration in concrete, was estimated using the depth profile of chlorine emission intensity and Fick's law. The carbonation depth was estimated on the basis of the relationship between carbon and calcium emission intensities.

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Performance of self‐compacting rubberized concrete

2021-3-17  This study assessed the performance of self-compacting rubberized concrete against carbonation and chloride penetration. In addition to fresh-state and compressive strength tests, durability of the studied mixes was evaluated by measuring carbonation and chloride penetration depths, total porosity, and pores'size distribution.

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Deterioration of Concrete Due to Combined

In most studies, deterioration of concrete due to carbonation or chloride penetration is investigated separately. However, the deterioration of concrete is normally caused by the combination. The purpose of this study is to

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Macrocell Corrosion of Steel in Concrete under

2021-12-13  In this work, the macrocell corrosion of steel embedded in concrete specimens exposed to accelerated carbonation, chloride contamination, and chloride penetration is studied using a modified ASTM G109 method.

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Quantification of the influence of cracks in concrete

2020-1-22  In order to study the influence of existing cracks in concrete structures on the carbonation and chloride penetration, small–scale experiments were carried out on mortar prisms. Six different mortar compositions were investigated, stored in five different environmental conditions. At regular times, the carbonation and chloride penetration of cracked and

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An Accelerated Test Method of Simultaneous Carbonation

2016-5-17  The effects of simultaneous carbonation and chloride ion attack on mechanical characteristics and durability of concrete containing silica fume have been investigated through an accelerated test method. Specimens containing different amounts of silica fume were maintained in an apparatus in which carbon dioxide pressure and concentration and relative humidity were

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Carbonation and Corrosion Problems in Reinforced

2022-3-15  Reinforced concrete (RC) has been commonly used as a construction material for decades due to its high compressive strength and moderate tensile strength. However, these two properties of RC are frequently hampered by degradation. The main degradation processes in RC structures are carbonation and the corrosion of rebars. The scientific community is divided

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[PDF] Concrete carbonation and chloride penetration in a

Corpus ID: 108288689. Concrete carbonation and chloride penetration in a marine environment @inproceedings{CostaConcreteCA, title={Concrete carbonation and chloride penetration in a marine environment}, author={A. Costa and J. Appleton} }

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Table 4 from Concrete carbonation and chloride

Table 4 Values of the carbonation coefficient K and coefficient n for concrete types C1 and C2 - "Concrete carbonation and chloride penetration in a marine environment"

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A Review on the Carbonation and Chloride Penetration

This paper presents a comprehensive review on structural lightweight aggregate concrete (SLWAC) durability. The main transport properties and degradation mechanisms of reinforced concrete are addressed, namely, carbonation and chloride attack. The influence of the main composition parameters, such a

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Quantitative estimation of carbonation and chloride

Made available by U.S. Department of Energy Office of Scientific and Technical Information ...

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Combined effect of carbonation and chloride ingress in

The combined effect of carbonation and chloride ingress in concrete is studied in this paper. Based on the change of the pore structure and the chemical equilibrium, a comprehensive model is proposed for this problem. A coupled simulation of the transports of carbon dioxide, chloride ions, heat and moisture is carried out.

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An Accelerated Test Method of Simultaneous Carbonation

2016-5-17  The effects of simultaneous carbonation and chloride ion attack on mechanical characteristics and durability of concrete containing silica fume have been investigated through an accelerated test method. Specimens containing different amounts of silica fume were maintained in an apparatus in which carbon dioxide pressure and concentration and relative humidity were

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Chloride Attack on Concrete Structures - Cause

Chloride Content Limit in Concrete Structures The chloride content limit is the amount of chloride that must be present in concrete along with oxygen and moisture in order to facilitate corrosion. Table-1 below shows the ACI 318-95

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Macrocell Corrosion of Steel in Concrete under

2021-12-13  The results showed that, at the same level of anodic potential drops, the corrosion current rate in chloride-induced corrosion is higher than that of carbonation-induced corrosion. Chloride contamination is less detrimental to concrete incorporated with slag and pulverized fly ash than it is to pure ordinary Portland cement (OPC), likely due to ...

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Concrete Chloride Testing - Structural Guide

2022-7-23  The testing of the chloride content of reinforced concrete is done as stipulated in BS1881. When the structures are retrofitted, this issue is the rise and the requirement of the testing of chloride becomes a must with the exposure

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Carbonation and Corrosion Problems in Reinforced

2022-3-15  Reinforced concrete (RC) has been commonly used as a construction material for decades due to its high compressive strength and moderate tensile strength. However, these two properties of RC are frequently hampered by degradation. The main degradation processes in RC structures are carbonation and the corrosion of rebars. The scientific community is divided

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