Testing the Chloride Penetration Resistance of Concrete
Author | : K. D. Stanish |
Publisher | : |
Total Pages | : 62 |
Release | : 2000* |
Genre | : Concrete |
ISBN | : |
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Author | : K. D. Stanish |
Publisher | : |
Total Pages | : 62 |
Release | : 2000* |
Genre | : Concrete |
ISBN | : |
Author | : Jitendra A. Jain |
Publisher | : Elsevier Inc. Chapters |
Total Pages | : 17 |
Release | : 2012-11-12 |
Genre | : Technology & Engineering |
ISBN | : 0128090456 |
Disposal of aged concrete pavements involves great cost and (due to volumes involved) can be detrimental to environment when all of this material is deposited in landfills. It is therefore cost-effective to recycle crushed concrete as coarse aggregates (referred hereafter as RCA) to replace natural aggregates (NA) during construction of new concrete pavements. This approach reduces the need for quarrying of natural aggregates and saves space in the landfills. The main focus of this study was on determining the chloride penetration resistance of pavement concretes containing various levels (0, 30 and 100%) of RCA as a replacement for NA. All concrete mixtures used in this study were designed to meet the fresh properties and flexural strength requirements specified for pavements by the Indiana Department of Transportation (INDOT). The resistance to chloride ion penetration was determined using two electrical migration tests: rapid chloride permeability (RCP) test (as per ASTM C1202) and non-steady state migration test (as per NT BUILD 492). Before the initiation of the RCP test, all specimens were first subjected to 250mVAC potential scan using SolartronTM 1260 gain-phase impedance analyzer. The impedance spectra (collected over a frequency range of 0.1Hz to 10MHz) were used to obtain bulk resistance (Rb) of the concrete. The steady state diffusion coefficients were calculated using RCP test data in Nernst-Plank and empirical equations. The general trends obtained from the chloride penetration resistance results indicate that initial current values from RCP test can be used to predict the performance of concretes containing RCA. Mixtures with 30% RCA performed similar to 0% RCA mixture while the resistance to chloride penetration of concrete with 100% RCA was somewhat reduced.
Author | : John T. Nugent |
Publisher | : |
Total Pages | : 36 |
Release | : 2020 |
Genre | : Concrete |
ISBN | : |
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.
Author | : Luping Tang |
Publisher | : CRC Press |
Total Pages | : 264 |
Release | : 2011-10-06 |
Genre | : Technology & Engineering |
ISBN | : 0203882415 |
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
Author | : Neal Steven Berke |
Publisher | : ASTM International |
Total Pages | : 197 |
Release | : 1990 |
Genre | : Chlorides |
ISBN | : 0803114583 |
Author | : Carmen Andrade |
Publisher | : RILEM Publications |
Total Pages | : 466 |
Release | : 2004 |
Genre | : Cholorides |
ISBN | : 9782912143488 |
Author | : David Whiting |
Publisher | : |
Total Pages | : 232 |
Release | : 1988 |
Genre | : |
ISBN | : 9780870316067 |
Author | : fib Fédération internationale du béton |
Publisher | : fib Fédération internationale du béton |
Total Pages | : 128 |
Release | : 2006-01-01 |
Genre | : Technology & Engineering |
ISBN | : 9782883940741 |
fib Bulletin 34 addresses Service Life Design (SLD) for plain concrete, reinforced concrete and pre-stressed concrete structures, with a special focus on design provisions for managing the adverse effects of degradation. Its objective is to identify agreed durability related models and to prepare the framework for standardization of performance based design approaches. Four different options for SLD are given: - a full probabilistic approach, - a semi probabilistic approach (partial factor design), - deemed to satisfy rules, - avoidance of deterioration. The service life design approaches described in this document may be applied for the design of new structures, for updating the service life design if the structure exists and real material properties and/or the interaction of environment and structure can be measured (real concrete covers, carbonation depths), and for calculating residual service life. The bulletin is divided into five chapters: 1. General 2. Basis of design 3. Verification of Service Life Design 4. Execution and its quality management 5. Maintenance and condition control It also includes four informative annexes, which give background information and examples of procedures and deterioration models for the application in SLD. The format of Bulletin 34 follows the CEB-FIP tradition for Model Codes: the main provisions are given on the right-hand side of the page, and on the left-hand side, the comments. Note: An Italian translation of Bulletin 34 is also available; contact us for further details.
Author | : Luca Bertolini |
Publisher | : John Wiley & Sons |
Total Pages | : 389 |
Release | : 2013-02-26 |
Genre | : Technology & Engineering |
ISBN | : 3527651713 |
Steel-reinforced concrete is used ubiquitously as a building material due to its unique combination of the high compressive strength of concrete and the high tensile strength of steel. Therefore, reinforced concrete is an ideal composite material that is used for a wide range of applications in structural engineering such as buildings, bridges, tunnels, harbor quays, foundations, tanks and pipes. To ensure durability of these structures, however, measures must be taken to prevent, diagnose and, if necessary, repair damage to the material especially due to corrosion of the steel reinforcement. The book examines the different aspects of corrosion of steel in concrete, starting from basic and essential mechanisms of the phenomenon, moving up to practical consequences for designers, contractors and owners both for new and existing reinforced and prestressed concrete structures. It covers general aspects of corrosion and protection of reinforcement, forms of attack in the presence of carbonation and chlorides, problems of hydrogen embrittlement as well as techniques of diagnosis, monitoring and repair. This second edition updates the contents with recent findings on the different topics considered and bibliographic references, with particular attention to recent European standards. This book is a self-contained treatment for civil and construction engineers, material scientists, advanced students and architects concerned with the design and maintenance of reinforced concrete structures. Readers will benefit from the knowledge, tools, and methods needed to understand corrosion in reinforced concrete and how to prevent it or keep it within acceptable limits.
Author | : American Association of State Highway and Transportation Officials |
Publisher | : |
Total Pages | : 14 |
Release | : 2007 |
Genre | : Chlorides |
ISBN | : |
"This procedure is for the rapid evaluation of chloride penetration resistance of concrete, from non-steady-state migration experiments." -- Page 1.