3 edition of Prediction of chloride penetration in concrete found in the catalog.
Prediction of chloride penetration in concrete
by U.S. Dept. of Transportation, Federal Highway Administration, Turner-Fairbank Highway Research Center in McLean, Va
Written in English
|Statement||[R.D. Hooton, M.D.A. Thomas, K. Stanish]|
|Contributions||Thomas, M. D. A., Stanish, K., United States. Federal Highway Administration. Office of Infrastructure Research and Development., Turner-Fairbank Highway Research Center., University of Toronto. Dept. of Civil Engineering.|
|The Physical Object|
|Pagination||x, 419 p.|
|Number of Pages||419|
Prediction is based on a one-dimensional finite difference solution of Fick's second law of diffusion, with a variable external chloride concentration and a two-layer representation of the concrete. Surface treatment option has been added in and mill and fill option added in in collaboration with Prof. Guthrie of Brigham Young University. 1 CHLORIDE PENETRATION PREDICTION IN CONCRETE 2 THROUGH AN EMPIRICAL MODEL BASED ON CONSTANT 3 FLUX DIFFUSION G. de Vera1, M. A. Climent2, E. Viqueira3, C. Anton4, M. P. L opez5 4 5 ABSTRACT 6 An empirical model based on constant ux is presented for chloride transport through 7 concrete in atmospherical exposure conditions. A continuous supply of chlorides .
capacity on age of concrete are clari ed. ird, chloride pro les in hardening concrete are calculated. e proposed numerical procedure is veri ed by using chloride submerged penetration test results of concrete with di erent mixing proportions. 1. Introduction e ingress of chloride ions constitutes a major source of durability problems a. Chloride-induced corrosion is widely accepted as one of the primary causes of premature deterioration for concrete structures in marine or deicing salt environment. For precast concrete (PC) structures, such durability problems may even be severer because defects in joint areas, e.g., cracks caused by grout shrinkage and improper construction, can accelerate chloride ion transportation process Author: Dawei Zhang, Yu Zeng, Mingshan Fang, Weiliang Jin.
; 18(2) Prediction of Chloride Ion Penetration of Recycled Aggregate Concrete are thus easy to remove from RA. Debieb et al suggested that, after a thorough washing or total immersion in water for at least 2 weeks, the chlorides content decreases to a point where these RA can be used in reinforced concrete and even in prestressed. Chloride penetration into concrete in marine environment – Part II: Prediction of long term chloride penetration A. Costa and J. Appleton Departamento de Engenharia Civil, Instituto Superior Técnico, Technical University of Lisbon, Av. Rovisco Pais, Lisboa Codex, Portugal methodology the chloride concentration inside concrete.
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Chloride Penetration Prediction in Concrete through an Empirical Model Based on Constant Flux Diffusion proceedings papers, and available book chapters across the entire ASCE Library platform.
ASCE Library Cards remain active for 12 months or until all downloads are used. Numerical Model for Chloride Penetration into Saturated Concrete. Get this from a library. Prediction of chloride penetration in concrete. [R Douglas Hooton; M D A Thomas; K Stanish; United States.
Federal Highway Administration. Office of Infrastructure Research and Development.; University of Toronto. Department of Civil Engineering.]. Publication Details Prediction of Chloride Penetration in Concrete. Primary Topic: Materials-Concrete.
Description: Final report documenting evaluations of different test methods to determine chloride penetration in concrete and the identification of the most suitable and robust test procedure. FHWA Publication Number: FHWA-RD Publication Year: In marine and coastal environments, penetration of chloride ions is one of the main mechanisms causing concrete reinforcement corrosion.
Currently, most of experimental investigations about submerged penetration of chloride ions are started after the four-week standard curing of concrete.
The further hydration of cement and reduction of chloride diffusivity during submerged penetration Cited by: 7. This Paper presents a wide range of experimental data on chloride Concentrations in the pore fluid (free chloride contents) of various mixes of concrete.
The results show that Fick's second law for unidirectional diffusion into a semi-infinite medium is valid for free chloride penetration into by: This article presents a brief review of the models aimed to predict the penetration of chloride ions in concrete.
The work highlights the two well-known approaches i.e. Fick's laws and. Abstract. The paper presents a wide range of experimental data of the authors and of other researchers on acid-soluble chloride diffusion in different mixes of concrete, and shows conclusively that the chloride diffusion coefficient D c is strongly dependent on the period of exposure of concrete to a chloride environment.
Consequently, long term prediction of chloride concentrations on the Cited by: The rate of chloride penetration into concrete is affected by the chloride binding capacity of the concrete.
Concrete is not inert relative to the chlorides in the pore solution. A portion of the chloride ions reacts with the concrete matrix becoming either chemically or physically bound, and this bindingFile Size: KB. There are different driving forces for chloride penetration in concrete: surface tension (absorption), pressure (permeation) and diffusion (movement of ions under a concentration gradient).
From those, chloride ion ingress by diffusion is the dominant long-term mechanism for structures exposed to marine environments and deicing Size: 1MB.
As for chloride penetration depth, it can be explained by Fick’s laws of diffusion. Simply speaking, the chloride penetration depth is governed by the square root of the diffusion coefficient (D) times the age of concrete (t), and a constant, depending on the diffusion conditions.
Abstract. In this study, the mathematical modelling of chloride penetration into concrete structures is suggested to consider two main phenomena: 1) chloride penetration through the pore solution and 2) the distribution of the total chloride content in by: Testing of a concrete sealer using the rapid chloride permeability technique.
Recent Publications. Pipe demand in the US is forecast to increase percent per annum to billion feet in the yearstimulated by needs to upgrade pipe Researchers Develop New Test to Measure Chloride Penetration in Concrete.
Chloride concentration is an important parameter for estimating the corrosion state of concrete. In this research, first chloride concentration at various depths of concrete specimens was measured using the accelerated chloride penetration test method under laboratory conditions, simulating a marine environment after 45 and 9 by: 7.
structures and in the prediction of future service life. The present recommendation is the result of a Round-Robin Test on chloride analysis in concrete, car-ried out by the Technical Committee TC TMC. A Analysis of total chloride content in concrete RILEM TC TMC: ‘TESTING AND MODELLING CHLORIDE PENETRATION IN CONCRETE’ RILEM File Size: 99KB.
The numerical model ClinConc (Cl in Concrete) for prediction of chloride penetration into concrete was first presented in the middle of ’s (Tang & Nilsson ; Tang ).
The model consists of two main procedures: 1. Simulation of free chloride penetration through the pore solution in concrete using a genuine flux equation.
Quantitative data on chloride penetration is essential to predict the residual service life of concrete structures due to chloride attack, because chloride ion directly affects degradation of durability performance and further the structural safety of concrete structures due to chloride induced reinforcement by: Get this from a library.
Prediction of chloride penetration in concrete. [R Douglas Hooton; M D A Thomas; K Stanish; United States. Federal Highway Administration.
Office of Infrastructure Research and Development.; Turner-Fairbank Highway Research Center. Chloride-induced corrosion is the main threat to the service life of concrete structures.
In order to better investigate chloride distribution in offshore concrete, this study proposed a new prediction model based on statistical analysis as well as a large body of experimental results collected from various sources. A detailed discussion found that the key influential parameters, such as Cited by: 1.
concrete, changes in durability are to be expected. As part of a larger project studying the durability of self-compacting concrete, the chloride penetration in self-compacting concrete was investigated. An experimental program was carried out on 16 self-compacting concrete mixes and 4 traditional concrete.
Chloride-induced corrosion is the most important durability issue of reinforced concrete structures, and the prediction and prevention of chloride-induced corrosion has attracted considerable interest all over the world. Given that chloride penetrates through the concrete cover, the issues concerning its transport are : Shi Caijun, Yuan Qiang, He Fuqiang, Hu Xiang.
The aim of the study was to generate rules for the prediction of the chloride resistance of concrete modified with high calcium fly ash using machine learning methods.
The rapid chloride permeability test, according to the Nordtest Method Buildwas used for determining the chloride ions’ penetration in concrete containing high calcium fly ash (HCFA) for partial replacement of Portland Cited by: 6.chloride penetration rates through the concrete and thus reducing the amount and rate of corrosion of the reinforcing steel therein.
Field panels were constructed and placed at Pier 38 in Honolulu Harbor on the island of Oahu in and and first sampled for chloride concentrations in from a previous phase of this overall study.The aim of this research is to present an implementation of ANN to predict the Chloride penetration of self-consolidating concrete (SCC), containing various amounts of cement replacement minerals.