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Developing And Evaluating Rapid Test Methods For Measuring The Sulphate Penetration Resistance Of Concrete In Relation To Chloride Penetration Resistance
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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.
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 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.
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 Surface Resistivity Test Evaluation as an Indicator of the Chloride Permeability of Concrete by :
Download or read book Surface Resistivity Test Evaluation as an Indicator of the Chloride Permeability of Concrete written by and published by . This book was released on 2012 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhancing the Reliability of Evaluating Chloride Ingress in Concrete Using the ASTM C 1202 Rapid Chloride Penetrability Test by : MT. Bassuoni
Download or read book Enhancing the Reliability of Evaluating Chloride Ingress in Concrete Using the ASTM C 1202 Rapid Chloride Penetrability Test written by MT. Bassuoni and published by . This book was released on 2006 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid chloride penetrability test (RCPT-ASTM C 1202) is commonly used to evaluate the resistance of concrete to chloride ions ingress owing to its simplicity and rapidity. However, it has been criticized for various shortcomings such as giving favorable results to supplementary cementitious materials (e.g., silica fume), and bias against calcium nitrite corrosion inhibitors (CNI). Based on the ASTM C 1202 induced voltage concept, this study aims at enhancing the reliability of rapidly evaluating concrete resistance to chloride ions ingress. It is proposed that upon test termination, not only the passing charges are recorded, but the depth of chloride front migrating into concrete is also measured. Concrete mixtures herein were prepared incorporating selected materials (silica fume and CNI) that have been known to cause misleading results for the RCPT test. The effects of silica fume and CNI dosages on RCPT results were investigated and correlated to porosity trends evaluated by mercury intrusion porosimetry (MIP). The study reveals that measuring the migrating chloride front in concrete subsequent to the ASTM C 1202 test can eliminate the bias induced by electrolysis conductivity resulting from silica fume and/or CNI. This improves the reliability of assessing concrete resistance to chloride ions penetration using the RCPT procedure.
Book Synopsis Performance Criteria for Concrete Durability by : H. Hilsdorf
Download or read book Performance Criteria for Concrete Durability written by H. Hilsdorf and published by CRC Press. This book was released on 2004-06-02 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a state-of-the-art report prepared by RILEM Technical Committee 116-PCD and is an authoritative, international review of the subject and is an essential reference source for engineers and technologists. Performance Criteria for Concrete Durability explains key aspects of concrete durability, and the relationships between transport mechanisms and concrete durability characteristics. It reviews test methods for measuring permeability in the laboratory and on site, and discusses the many factors which influence the durability of concrete to carbonation, chlorides, abrasion etc.
Book Synopsis Testing the Chloride Penetration Resistance of Concrete by : K. D. Stanish
Download or read book Testing the Chloride Penetration Resistance of Concrete written by K. D. Stanish and published by . This book was released on 2000* with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ACI Materials Journal written by and published by . This book was released on 2001 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of the Rapid Test Methods for Measuring the Chloride Diffusion Coefficients of Concrete by : Tang Luping
Download or read book Evaluation of the Rapid Test Methods for Measuring the Chloride Diffusion Coefficients of Concrete written by Tang Luping and published by . This book was released on 1998 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Interim Report Covering a 17-country Inventory by : International Road Federation
Download or read book An Interim Report Covering a 17-country Inventory written by International Road Federation and published by . This book was released on 1966 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rating Concrete Water Permeability Based on Resistivity Measurements by : Christopher C. Ferraro
Download or read book Rating Concrete Water Permeability Based on Resistivity Measurements written by Christopher C. Ferraro and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Current test methods that measure the electrical conductance or resistivity of concrete provide a rapid indication of concrete ability to resist chloride ion penetration. Although these methods do not provide a direct relationship to concrete water permeability, they have been widely accepted for assessing the durability of concrete. NCHRP Research Report 1086: Rating Concrete Water Permeability Based on Resistivity Measurements, from TRB's National Cooperative Highway Research Program, presents a test method for measuring water permeability of concrete and proposes an approach for relating concrete water permeability to electrical resistivity measurements."--Publisher's website.
Book Synopsis Surface Resistivity as an Alternative for Rapid Chloride Permeability Test of Hardened Concrete by : Andrew Jenkins
Download or read book Surface Resistivity as an Alternative for Rapid Chloride Permeability Test of Hardened Concrete written by Andrew Jenkins and published by . This book was released on 2015 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kansas experiences harsh winters that require frequent use of de-icing salts, making it critical to the long-term durability of concrete structures that the permeability is kept under control. Under current KDOT specification, the Rapid Chloride Permeability (RCP) test, as described in ASTM Standard C1202 (2012), or the Volume of Permeable Voids method, described in ASTM Standard C642 (2013), more commonly known as the boil test, must be performed to evaluate concrete permeability. Surface resistivity testing was investigated as an alternative to these tests. Testing for surface resistivity was set up to evaluate the correlation of surface resistivity with RCP and boil tests, the effect of loss of saturation on the sample, and the repeatability of surface resistivity testing. Results indicate a strong relationship (R-squared value of 0.84) between 28-day surface resistivity and 56-day C1202 RCP testing. Results also correlate well to a mathematical relationship derived through Ohm's Law. Surface resistivity did not have a strong relationship (R-squared value of 0.37) with C642 boil testing. Cylinders were cast to evaluate the effect of saturation levels and differential sample drying. Cylinders were allowed to dry for varying lengths of time at different ages. Results indicated that allowing the samples to dry, regardless of the length of drying time and the age at which the samples were drying, increased the surface resistivity results by an average of 15%. Through the course of this study, including all samples tested, the standard deviation and coefficient of variation on any given set of cylinders is 1.4 and 4.9%, respectively. If only samples used for the correlation of 28-day surface resistivity to 56-day RCP are used, the coefficient of variation is 4.2%. A cost-benefit analysis was performed to evaluate the monetary savings resulting from this research. A triennial analysis indicates a total cost savings by KDOT and contractors of approximately $980,000 and a cost-benefit ratio of 9.2. As a result of this research, recommended specification limits have been developed for surface resistivity testing. As of January 2014, surface resistivity testing has been added to KDOT Standard Specifications as an alternate test method for concrete permeability.
Book Synopsis Application of the Rapid Chloride Permeability Test to Evaluation of Penetrating Sealers for Concrete by : D. Whiting
Download or read book Application of the Rapid Chloride Permeability Test to Evaluation of Penetrating Sealers for Concrete written by D. Whiting and published by . This book was released on 1987 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specimens for rapid and long-term (90-day) chloride permeability measurements were prepared from a conventional concrete mixture. Three penetrating sealers were evaluated, using different methods of specimen conditioning. Results indicate that the rapid chloride permeability test may indicate differences between sealers which are not apparent when subjected to long-term chloride ponding. The method chosen to condition the specimens prior to testing has a significant influence upon the results.
Book Synopsis Symposium Proceedings by : L. S. Johal
Download or read book Symposium Proceedings written by L. S. Johal and published by . This book was released on 1997 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Permeability of Concrete by : David Whiting
Download or read book Permeability of Concrete written by David Whiting and published by . This book was released on 1988 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Standard Test Method for Rapid Assessment of Static Segregation Resistance of Self-Consolidating Concrete Using Penetration Test by :
Download or read book Standard Test Method for Rapid Assessment of Static Segregation Resistance of Self-Consolidating Concrete Using Penetration Test written by and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
