Chloride thresholds in marine concrete ScienceDirect

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Chloride thresholds in marine concrete - ScienceDirect

Apr 01, 1996  This threshold chloride level decreased with increasing fly ash content; values obtained were 0.70%, 0.65%, 0.50% and 0.20% acid-soluble chloride (by mass of

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Chloride threshold, modelling of ... - sciencedirect

1. Introduction. Reinforcement corrosion induced by chloride attack serves as the dominant degradation mechanism for marine concrete structures and in turn

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Analysis of chloride threshold from ... - sciencedirect

Analysis of chloride threshold from laboratory and field experiments in marine atmosphere zone ... The present work analyses results from reinforced concrete

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Initial corrosion presented by chloride threshold ...

Dec 01, 2012  (a) Evaluation of chloride threshold level of Portland cement concrete with a W/B ratio of 0.45 (concrete I45) based on the relationship between the free

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Chloride threshold level for corrosion of steel in concrete

Nov 01, 2007  1.. IntroductionThe importance of chloride ions in the corrosion of steel in concrete has led to the concept of a chloride threshold level (CTL). The CTL can be

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Analysis of chloride threshold from ... - ScienceDirect

Mar 31, 2014  It has been reported that chloride threshold decreases as water to binder ratio increases, as a consequence of a higher availability of moisture and oxygen . In a

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Predicting the chloride penetration of fly ash concrete in ...

Jul 01, 2009  In Eq. , C x,t is determined provides the best fit to experimental data for a chloride penetration profile of concrete with a W/B ratio of 0.65 obtained from the actual marine site. Regression analysis yielded the empirical coefficient (β) and the chloride concentration at concrete surface (C o) for concrete with W/B ratios of 0.65 at 2-, 3-, 4-, and 5-year exposures to the tidal zone of ...

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Chloride ingress into marine exposed concrete: A ...

Sep 01, 2016  Chloride transport in concrete exposed to a marine environment was evaluated using both the erfc (Fickian) solution and the ClinConc model. The study undertook an extensive chloride profiling programme based on field-data obtained from full-scale, concrete pier-stems in the XS2 and XS3 environmental exposure zones over an extended period of time.

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A probabilistic framework to justify allowable admixed ...

A probabilistic framework to justify allowable admixed chloride limits in concrete Mahmoud Shakouria,⇑, David Trejoa, Paolo Gardonib a School of Civil and Construction Engineering, Oregon State University, Corvallis, OR, USA bDept. of Civil and Environmental Engineering, University of Illinois at Urbana–Champaign, IL, USA highlights A risk-based framework is introduced to justify the ...

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Numerical service-life modeling of chloride-induced ...

erties of the concrete, geometry, the boundary conditions that exist for a given environment and application, and the required concen-tration of chlorides to initiate the corrosion of the reinforcing steel (i.e., chloride threshold). Corrosion initiation is defined as the time that it takes for chlorides from the surrounding environment to

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Relationship between Chloride/hydroxide Ratio and ...

Chloride/hydroxide ratio and steel corrosion in concrete 285 chloride-alkalinity relationship on the rate of corrosion of steel embedded in concrete under different exposure conditions. In the present work, performance data col- lected under a long term exposure programme over 3 years have been analysed.

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(PDF) Chloride-induced corrosion modelling of cracked ...

A most important criterion, [25] RILEM TC 178-TMC, Testing and modelling chloride Magazine of Concrete Research 47 (1995) 235–242. penetration in concrete. Analysis of total chloride content [13] M. Thomas, Chloride thresholds in marine concrete, Cement in concrete

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(PDF) Atmospheric chloride deposition in field concrete at ...

The chloride deposition content on concrete structure is investigated at. three coastal districts of Nanshan, Yantian, and Dapeng Peninsula in Shenzhen city. 1016 J. Liu et al. / Construction and ...

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The chloride-induced corrosion of a fly ash concrete with ...

The chloride-induced corrosion of a fly ash concrete with nanoparticles and corrosion inhibitor Manu Harilala, Deepak K. Kamdeb, Sudha Uthamanb, R.P. Georgea,⇑, Radhakrishna G. Pillaib, John Philipa, Shaju.K. Alberta a Corrosion Science and Technology Division, MCG, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam, Tamil Nadu 603102, India

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Chloride thresholds in marine concrete - 百度学术

This threshold chloride level decreased with increasing fly ash content; values obtained were 0.70%, 0.65%, 0.50% and 0.20% acid-soluble chloride (by mass of cementitious material) for concrete with 0%, 15%, 30% and 50% ash, respectively. Despite the lower threshold values, fly ash concrete was found to provide better protection to the steel ...

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Reinforced concrete in marine environment: Effect of ...

Inspection procedure of concrete structures exposed to a marine environment. There is a strong effect of the wetting and drying cycles on the chloride-ion content was verified. Helping to understand the work in service of real reinforced concrete structures. Chloride ion contents were observed to have a tendency to decrease at higher places.

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Statistical Distributions for Chloride Thresholds of ...

sented as a single event that occurs at the chloride threshold. Chloride threshold can be expressed in a variety of ways: 1) chloride mass relative to weight of cement (% by wt. cem.); 2) chloride mass relative to weight of concrete (% 3); or 3) chloride ion to hydroxyl Title No. 118-M20 Statistical Distributions for Chloride Thresholds of

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Study on the Chloride Threshold and Risk Assessment of ...

Apr 20, 2020  Study on the Chloride Threshold and Risk Assessment of Rebar Corrosion in Simulated Concrete Pore Solutions under Applied Potential Hongze An 1, Guozhe Meng 1,2,*, Yanqiu Wang 1,*, Junyi Wang 1, Bin Liu 1 and Fuhui Wang 1,3 1 Corrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology,

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A novel experimental method to determine the critical ...

A novel experimental method to determine the critical chloride content in cement-based composites Hamidreza Fakhria, Kenneth L. Fishmana, Ravi Ranadeb,⇑ a McMahon Mann Consulting Engineering and Geology, P.C., 2495 Main St #432, Buffalo, NY 14214, USA bDepartment of Civil, Structural and Environmental Engineering, University at Buffalo, State University of New York, 135 Ketter Hall ...

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Long-Term Durability of Marine Reinforced Concrete Structures

Apr 18, 2020  any conventionally accepted chloride threshold criterion [8,9]. In some cases, the investigations ascertained the remaining pH of the concrete and invariably this was shown to be high, indicating high reserves of concrete alkalinity and, therefore, protection e ect. Clearly, if

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(PDF) Factors affecting the chloride thresholds for ...

Slag cement concrete exposed to wetting and drying exhibited lower chloride thresholds as compared to Portland cement concrete with 0 or 5% silica fume in the binder.

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Analysis of Tools to Evaluate Chloride Threshold for ...

The chloride threshold for corrosion onset of reinforced concrete depends on several factors and is only valid for the specific condition of each factor. The main objective of this paper was to analyze different tools to obtain the chloride threshold for corrosion onset of reinforced concrete in tropical marine environment. Sixty Portland cement concrete cylinders were exposed in a tropical ...

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(PDF) Understanding the chloride binding and diffusion ...

Mar 19, 2019  PDF On Mar 19, 2019, Yunyao Wang and others published Understanding the chloride binding and diffusion behaviors of marine concrete based on Portland limestone cement-alumina enriched pozzolans ...

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Chloride initiated reinforcement corrosion in marine concrete

Measured total chloride thresholds for uncracked concrete based on sulfate resisting portland cement with w/c ratio 0.3-0.5 and exposed in the splash zone were in the range of 1.1-1.5 % total chloride by weight of binder. The effect of replacing the portland cement with 5 % silica fume on the chloride threshold was insignificant.

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Shenzhen University, Shenzhen, Guangdong Province, P.R ...

Chloride ions may locally break the passive film even in alkaline concrete. This occurs when chloride ions, which are contained, for instance, in seawater or in common de-icing salts, penetrate the concrete cover, and reach a critical threshold level at the depth of the reinforcement. Pitting corrosion thus initiates and may

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MODELING OF CORROSION OF STEEL IN CONCRETE WITH

MODELING OF CORROSION OF STEEL IN CONCRETE WITH POTENTIAL-DEPENDENT CHLORIDE THRESHOLD A. A. Sagüés, S.C. Kranc, and K. Lau Dept. of Civil and Environmental Engineering, University of South Florida 4202 E. Fowler Ave. ENB118 Tampa, FL 33620 ABSTRACT Deterministic forecast of corrosion damage progression in a reinforced concrete column

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Reinforced concrete in marine environment: Effect of ...

Inspection procedure of concrete structures exposed to a marine environment. There is a strong effect of the wetting and drying cycles on the chloride-ion content was verified. Helping to understand the work in service of real reinforced concrete structures. Chloride ion contents were observed to have a tendency to decrease at higher places.

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Types and Causes of Concrete Deterioration

Reinforced concrete exposed to chloride in service 0.15 Reinforced concrete that will be dry or protected from moisture in service 1.00 Other reinforced concrete construction 0.30 *Water-soluble chloride, percent by weight of cement. Carbonation Carbonation occurs when carbon dioxide from the air penetrates the concrete and reacts with ...

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Longterm corrosion performance of rebar embedded in ...

The reduction of chloride ion content in blended cement concrete was varied from 1.4 to 3.1 times less than the OPC concrete among all the three concretes studied. Reduction of alkalinity in 20 MPa concrete at the rebar level in PPC and PSC concrete is 6 and 10 times lower, respectively, than in OPC concrete.

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Model of Time-Dependent and Stress-Dependent Chloride ...

Both the apparent chloride diffusion coefficient Da and the surface chloride concentration Cs values were time and stress dependent with a sudden change threshold value of approximately 0.3 fc. A model was proposed to predict the chloride penetration profiles of concrete under sustained axial pressure, taking both the time-dependent and the ...

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Chloride initiated reinforcement corrosion in marine concrete

T1 - Chloride initiated reinforcement corrosion in marine concrete. AU - Sandberg, Paul. N1 - Defence details Date: 1998-08-20 Time: 10:15 Place: Room V:A, Civil Engineering External reviewer(s) Name: Fidjestol, Per Title: Doc. Affiliation: Kristiansand ---PY - 1998. Y1 - 1998

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Evaluation of field concrete deterioration under real ...

as critical chloride content or chloride threshold value [7]. So, the determination of chloride content within concrete indicates to how far the deterioration of the concrete is. (a) T08 (b) T03 (c) Q87 (d) Q50 Fig. 1. Images of concrete blocks exposed to seawater attack. Table 2 Concrete ingredients and its corresponding compressive strength.

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A novel experimental method to determine the critical ...

A novel experimental method to determine the critical chloride content in cement-based composites Hamidreza Fakhria, Kenneth L. Fishmana, Ravi Ranadeb,⇑ a McMahon Mann Consulting Engineering and Geology, P.C., 2495 Main St #432, Buffalo, NY 14214, USA bDepartment of Civil, Structural and Environmental Engineering, University at Buffalo, State University of New York, 135 Ketter Hall ...

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Chloride-Induced Corrosion of Steel in Concrete: An ...

As shown in Figure 7, the chloride front is diffusing inside the concrete from both faces.At the edges, the concentration from both sides is interfered and increased. Due to the synergic effect, the threshold chloride concentration will be attained at the corner reinforcements much earlier than the side reinforcements (although the cover depth is more at the corner reinforcement).

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