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Development Of Test Methods For Predicting Chloride Penetration Into High Performance Concrete Microform
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Author :Patrick F. (Patrick Francis) McGrath Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612190207 Total Pages : pages Book Rating :4.1/5 (92 download)
Book Synopsis Development of Test Methods for Predicting Chloride Penetration Into High Performance Concrete [microform] by : Patrick F. (Patrick Francis) McGrath
Download or read book Development of Test Methods for Predicting Chloride Penetration Into High Performance Concrete [microform] written by Patrick F. (Patrick Francis) McGrath and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis PRO 38: 3rd International RILEM Workshop on Testing and Modelling the Chloride Ingress into Concrete by : Carmen Andrade
Download or read book PRO 38: 3rd International RILEM Workshop on Testing and Modelling the Chloride Ingress into Concrete written by Carmen Andrade and published by RILEM Publications. This book was released on 2004 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Resistance of Concrete to Chloride Ingress by : Luping Tang
Download or read book Resistance of Concrete to Chloride Ingress written by Luping Tang and published by CRC Press. This book was released on 2011-10-06 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chloride ingress in reinforced concrete induces corrosion and consequent spilling and structural weakness, and it occurs world-wide and imposes an enormous cost. Yet it can be resisted by using test methods and relevant models for service life prediction.Resistance of Concrete to Chloride Ingress sets out current understanding of chloride transport
Book Synopsis Transport and Interactions of Chlorides in Cement-based Materials by : Caijun Shi
Download or read book Transport and Interactions of Chlorides in Cement-based Materials written by Caijun Shi and published by CRC Press. This book was released on 2019-07-26 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 crucial. These include testing methods, prediction, and the prevention of ingress. During the transport process, physical and chemical interaction occurs between chloride and cement hydrates, which in turn affects the further transport, so the transport of chloride and these interactions are closely related and underpin our understanding of chloride-induced corrosion in RC structures. This book provides in-depth discussion of chloride transport and its interaction in cement-based materials, and reviews and summarizes the state of the art. The mechanisms and testing methods for chloride transport, chemical interactions of chloride with cement hydrates, chloride binding isotherms, measurement of penetration depths, factors affecting chloride transport, and modeling of chloride transport are discussed in detail. This book serves as a reference for researchers or engineer, and a textbook for graduate students.
Book Synopsis Development of Test Methods for Evaluating the Impact of Curing Methods on Chloride Penetration Resistance of the Concrete by : Iva Dadic
Download or read book Development of Test Methods for Evaluating the Impact of Curing Methods on Chloride Penetration Resistance of the Concrete written by Iva Dadic and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two potential test methods for evaluating the impact of different curing regimes on the durability of the cover layer over reinforcement in precast concrete elements were investigated. Current CSA and ASTM test methods are not adequate for this purpose. The first method is a modified ASTM C1585 test using salt water and comparing the rate of absorption and chloride ingress of formed surfaces to those of cut surfaces at 10 mm and 20 mm depths. The second is a modified NORDTEST NT 492 rapid chloride migration test, where slices are cut from a companion concrete slab and exposed to sodium chloride solution. Testing was conducted on two types of precast concretes meeting CSA exposure classes C-1 and C-XL. Both of these concretes were exposed to different curing regimes. The results indicate that accelerated curing provides similar durability to 7 days moist curing at ambient temperature.
Book Synopsis Prediction of Chloride Penetration in Concrete by : R. Douglas Hooton
Download or read book Prediction of Chloride Penetration in Concrete written by R. Douglas Hooton and published by . This book was released on 2001 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :American Association of State Highway and Transportation Officials Publisher : ISBN 13 : Total Pages :14 pages Book Rating :4.:/5 (892 download)
Book Synopsis Standard Method of Test for Predicting Chloride Penetration of Hydraulic Cement Concrete by the Rapid Migration Procedure by : American Association of State Highway and Transportation Officials
Download or read book Standard Method of Test for Predicting Chloride Penetration of Hydraulic Cement Concrete by the Rapid Migration Procedure written by American Association of State Highway and Transportation Officials and published by . This book was released on 2007 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This procedure is for the rapid evaluation of chloride penetration resistance of concrete, from non-steady-state migration experiments." -- Page 1.
Book Synopsis Comparison of Two Methods for the Assessment of Chloride Ion Penetration in Concrete by : Eric William Ryan
Download or read book Comparison of Two Methods for the Assessment of Chloride Ion Penetration in Concrete written by Eric William Ryan and published by . This book was released on 2011 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The currently accepted method for assessing the resistance of concrete to penetration of chloride ions is ASTM C1202, commonly known as the "Rapid Chloride Permeability (RCP) Test." The test is time-consuming, laborious, has rather high variability, and, is to a degree, user sensitive, making it problematic for inclusion in a performance-based specification. A potential alternative to the RCP test is the "Surface Resistivity (SR) Test", a method which is dramatically easier, faster, and has less variability than the RCP test. The research reported herein was directed toward determining a correlation between RCP and SR test measurements for Tennessee bridge deck concrete, based on cylinders collected from concrete bridge decks being constructed across the state, and evaluating the appropriateness of the SR test as an alternative to the RCP test for inclusion in a performance-based specification. Results of the testing showed a clear correlation between the two methods and identified potential limits for possible inclusion in a performance-based specification.
Book Synopsis The Penetration of Chloride in Concrete Subject to Wetting and Drying by : S. Bioubakhsh
Download or read book The Penetration of Chloride in Concrete Subject to Wetting and Drying written by S. Bioubakhsh and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion of reinforcing steel arising from contamination by chlorides from de-icing salt is the major cause of deterioration of concrete bridges in the UK and many parts of the world. Those elements of structures exposed to cyclic wetting and drying (BS 8500-1, XD3) have proven to be the most vulnerable to corrosion damage. Penetration of chloride in concrete exposed to wet/dry environments occurs by diffusion and absorption. Diffusion is a relatively slow and quite well understood process. However, absorption is a relatively rapid transport mechanism and there is a lack of understanding of the role of this mechanism on chloride ingress as studies on chloride penetration in concrete exposed to wet/dry cycles ignore the effect of this mechanism on chloride ingress. In addition, chloride penetration prediction models are mostly based on Fick's laws of diffusion, ignoring the effect of absorption on chloride ingress. The aims of this work are: to develop a more detailed understanding of chloride penetration in concrete subjected to wet/dry cycles and identify the effect of absorption on chloride ingress; to produce reliable numerical model for chloride penetration due to this transport process; to recommend values of the minimum thickness of concrete cover to steel reinforcement relevant to this service environment or identify exposure conditions which require alternative methods of protection. The absorption test method used in this work is a cyclic regime as developed by TRL [Emerson and Butler, 1997] to represent site conditions. Concrete cubes, 100 mm3, were subjected to wet/dry cycles with the suction surface in contact with NaCl solution. Drying temperature was found to be the most critical factor influencing sorptivity and depth of chloride penetration. The salt solution concentration also had a significant effect on chloride penetration via the apparent surface chloride content. Moreover, the depth of chloride penetration was found to be proportional to the square root of exposure time. Two approaches to predict chloride penetration in concrete exposed to wet/dry cycling are proposed. The first is based on the relationship obtained in the present study between equilibrium sorptivity of concrete, Se, depth of chloride penetration, d, and time, t, which leads to the following general expression, where A, B and C are constants for a given cement type and salt solution concentration d = A×√t + B×Se + C The second method is simply based on the well known solution of Fick's second law but utilises values of apparent diffusion coefficient appropriate to this transport process. The first model suggests that, initially, absorption has a significant effect on chloride ingress but that diffusion dominates long-term behaviour. The outputs from these models suggest that the thicknesses of concrete cover in structures exposed to class XD3 should be higher than those currently recommended in BS 8500-1 (2006). However, there are practical limits as to what can be specified for thickness of concrete cover and therefore alternative methods of protection such as coatings or cathodic protection should be adopted when the concrete cover does not provide sufficient protection.
Book Synopsis Permeability of high performance concrete by : Wissam Elias Touma
Download or read book Permeability of high performance concrete written by Wissam Elias Touma and published by . This book was released on 1997 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chloride Penetration in High-performance Concrete in Florida Marine Bridges by : David E. Rey
Download or read book Chloride Penetration in High-performance Concrete in Florida Marine Bridges written by David E. Rey and published by . This book was released on 2002 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Model For Chloride Penetration In Concrete by : H'mida Hamidane
Download or read book A Model For Chloride Penetration In Concrete written by H'mida Hamidane and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major durability problem facing concrete structures in cold and marine regions is the corrosion of the reinforcing steel, mainly caused by chloride penetration, which results in the loss of structural integrity or even bearing capacity and subsequently collapse. A method for predicting the chloride ingress into concrete structures, which is the first and main phase of chloride induced reinforcement corrosion, is developed. It couples the problems of heat transfer, moisture transport, chloride diffusion and convection.The model is based on a multiscale two dimensional nonlinear time dependent finite element method. The model is capable of reproducing, with good precision, available test data
Book Synopsis Chloride Penetration Resistance of Concrete by : John T. Nugent
Download or read book Chloride Penetration Resistance of Concrete written by John T. Nugent and published by . This book was released on 2020 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Permeability is an important property to consider when designing concrete for long service lives but unfortunately requires long-term testing to be accurately measured. Short-term test methods to estimate permeability such as rapid chloride permeability (RCP), bulk resistivity (BR), and surface resistivity (SR) have therefore been developed. In this study, three short-term test methods are performed, and the results compared, RCP testing is performed using accelerated curing to determine whether testing can be shortened, and the effects of SCMs on results are examined. It was observed that all three test methods had strong positive correlations with one another. RCP testing performed on specimens subjected to an accelerated-curing regime for 28 days had a strong positive correlation with specimens that were cured in standard conditions for 91 days. The addition of SCMs improves concrete permeability; the beneficial effect of SCMs increases with the maturity of the concrete.
Book Synopsis Modeling of Chloride Penetration Into Concrete Structures Under Flexural Cyclic Load and Tidal Environment by :
Download or read book Modeling of Chloride Penetration Into Concrete Structures Under Flexural Cyclic Load and Tidal Environment written by and published by . This book was released on 2008 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: In marine environment, the deterioration of concrete structures is mainly due to chloride induced corrosion. With real concrete structures, the deterioration is controlled by the combination of mechanical load and climatic load. The mechanical load results cracks in concrete structures. The cracks accelerate the chloride penetration into concrete structures. As a result, the service life of concrete structures will be reduced considerably. There were many models proposed to predict the deterioration of concrete structures. However, these models are not reliable due to not having simultaneous combination of mechanical and climatic loads. In this research, a model, which simulates the chloride ingress into plain concrete, using different cement types, under flexural cyclic load and tidal environment, was proposed. This model is based on theoretical analysis and experiments of chloride diffusion test, chloride content test and flexural cyclic loading test. Flexural cyclic load is applied from 50% to 80% of to ultimate bending load. Fictitious crack model is adopted to predict fatigue crack growth of plain concrete beam under flexural fatigue. Experimental results show the linear relation between results of short-term and long-term test of chloride diffusion coefficient. Of the four common cement types, Ordinary Portland cement is the best cement type using for concretes in term of the chloride induced corrosion resistance because of the highest capacity to bind chloride ions. The proposed model shows that the flexural cyclic load accelerates chloride penetration into concrete. The higher the flexural load level, SR, the faster chloride penetration occurred. The model predictions fit well with experimental results when the crack density parameter, and the tortuosity parameter, are introduced.
Book Synopsis Chloride Penetration Into Concrete State-of-the-art by : Danish Road Directorate. HETEK.
Download or read book Chloride Penetration Into Concrete State-of-the-art written by Danish Road Directorate. HETEK. and published by . This book was released on 1996 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Developing and Evaluating Rapid Test Methods for Measuring the Sulphate Penetration Resistance of Concrete in Relation to Chloride Penetration Resistance by : Ester Karkar
Download or read book Developing and Evaluating Rapid Test Methods for Measuring the Sulphate Penetration Resistance of Concrete in Relation to Chloride Penetration Resistance written by Ester Karkar and published by . This book was released on 2011 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: External sulphate attack on concrete can lead to cracking, expansion and sometimes loss of cohesiveness of hardened cement paste. Therefore, aside from using sulphate resistant cementitious binders, it is important to design concrete which can resist sulphate penetration. In this research, both ASTM C1202 and NT Build 492 electrical migration tests were modified such that sulphate rather than chloride penetration resistances were measured. Modifications included exposing concrete specimens to Na2SO 4 rather than NaCl solutions and measuring the depth of sulphate penetration visually using BaCl2+KMnO4 rather than AgNO3 solution. Nine concrete mixtures of varying w/cm, slag replacement and cement types were tested in both original standard tests and modified tests to evaluate the influence of these material variables on test results and compare chloride to sulphate results. It was found that while migration coefficients and total charge passing were lower for sulphate, the influence of material variables were relatively similar.
Download or read book HETEK written by J. M. Frederiksen and published by . This book was released on 1997 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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