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Author : Wallace Matthew Mosher
Publisher :
ISBN 13 :
Total Pages : 318 pages
Book Rating : 4.:/5 (389 download)
Download or read book The Image Analysis of Air-voids in Hardened Concrete written by Wallace Matthew Mosher and published by . This book was released on 1997 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Scott Schlorholtz
Publisher :
ISBN 13 :
Total Pages : 62 pages
Book Rating : 4.:/5 (397 download)
Download or read book Image Analysis for Evaluating Air Void Parameters of Concrete written by Scott Schlorholtz and published by . This book was released on 1998 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. M. Ramezanianpour
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (125 download)
Download or read book Evaluation of Two Automated Methods for Air-Void Analysis of Hardened Concrete written by A. M. Ramezanianpour and published by . This book was released on 2010 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air-void analysis of hardened concrete is typically performed according to ASTM C457-09 ["Standard Test Method for Microscopical Determination of Parameters of Air-Void System in Hardened Concrete," Annual Book of ASTM Standards, Vol. 4.2, ASTM International, West Conshohocken, PA], which can be tedious to perform and is operator subjective. Several alternative automated methods have been proposed, two of which are the Rapid Air 457 and the scanner method developed at Michigan Technological University. In each of these methods, images are collected from contrast enhanced surfaces of polished concrete, and image analysis is performed to calculate air-void system parameters. In this research, 22 concrete samples were examined using these two methods, the air-void system parameters were compared to those obtained from the ASTM C457 standard, and the precision of the results was compared to the recommendations of ASTM standard. It was concluded that the total air content and the spacing factor of the air voids measured by Rapid Air 457 and the scanner method were comparable to the air content and the spacing factor measured according to the standard manual method. Considering the fact that the automated image systems could detect air voids smaller in diameter than those typically seen by an operator, it was found that if these small air voids are counted, calculated spacing factors are smaller than those calculated by the manual method. If small diameter air voids are removed from the analysis, then spacing factors agree fairly well with those calculated by ASTM C457 from stereo-optical microscopy.
Author : J. Cahill
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (125 download)
Download or read book The Identification and Measurement of Entrained Air in Concrete Using Image Analysis written by J. Cahill and published by . This book was released on 1994 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of ASTM C457 ("linear traverse" or "modified point-count methods") for microscopical determination of air-void content and parameters of the air-void system, in hardened concrete has become widespread in the prediction of the durability of concrete in freeze-thaw conditions, and in assessing concrete that has failed in service. More recently a new European Standard, based on linear traverse measurements has been adopted as an efficacy test for air entraining agents. The linear traverse method described in both standards involves identification, counting and, in the Euro Standard, measurement of air-voids. It is laborious, tedious and subjective and the error of the method has not been rigorously assessed. We have explored the possibility of using Image Analysis in conjunction with the linear traverse method to develop less laborious and subjective measurement methods. A number of methods of visualisation of air-voids have been applied to polished samples of hardened concrete which had previously been assessed by the standard linear traverse method. The quality of the surface preparation required for Image Analysis was found to be even more critical than for the standard manual method.
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Author : Leo P. H. (Leo Pieter H.) Meyer
Publisher : National Library of Canada
ISBN 13 : 9780315140820
Total Pages : 320 pages
Book Rating : 4.1/5 (48 download)
Download or read book Determination of Air Content of Hardened Concrete Using Image Analysis [microform] written by Leo P. H. (Leo Pieter H.) Meyer and published by National Library of Canada. This book was released on 1983 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Basil Mark Harris
Publisher :
ISBN 13 :
Total Pages : 634 pages
Book Rating : 4.E/5 ( download)
Download or read book Microscopic Air Void Analysis of Hardened Portland Cement Concrete by the Isolated Shadow Technique written by Basil Mark Harris and published by . This book was released on 1998 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Joseph F. Lamond
Publisher : ASTM International
ISBN 13 : 0803133677
Total Pages : 661 pages
Book Rating : 4.8/5 (31 download)
Download or read book Significance of Tests and Properties of Concrete and Concrete-making Materials written by Joseph F. Lamond and published by ASTM International. This book was released on 2006 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kalliopi K. Aligizaki
Publisher : CRC Press
ISBN 13 : 1482271958
Total Pages : 433 pages
Book Rating : 4.4/5 (822 download)
Download or read book Pore Structure of Cement-Based Materials written by Kalliopi K. Aligizaki and published by CRC Press. This book was released on 2005-09-22 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pore Structure of Cement-Based Materials provides a thorough treatment of the experimental techniques used to characterize the pore structure of materials. The text presents the principles and practical applications of the techniques used, organized in an easy-to-follow and uncomplicated manner, providing the theoretical background, the way to anal
Author : José Sena-Cruz
Publisher : Springer Nature
ISBN 13 : 3030764656
Total Pages : 361 pages
Book Rating : 4.0/5 (37 download)
Download or read book Proceedings of the 3rd RILEM Spring Convention and Conference (RSCC 2020) written by José Sena-Cruz and published by Springer Nature. This book was released on 2021-07-13 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers peer-reviewed contributions presented at the 3rd RILEM Spring Convention and Conference, held at Guimarães and hosted by the University of Minho, Portugal, on March 9-14, 2020. The theme of the Conference was “Ambitioning a Sustainable Future for Built Environment: comprehensive strategies for unprecedented challenges”, which was aimed at discussing current challenges and impacts of the built environment on sustainability. The present volume is dedicated to the topic “Service life extension of existing structures”, which covers the most recent scientific and technological developments in the understanding of the evolution and degradation of construction materials and structural systems. Analytical and numerical, as well as experimental approaches, aimed at characterizing, modelling and predicting the evolution of the physical, chemical and mechanical properties of construction materials and structural systems are regarded. Multiphysics models are also considered, as well as other strategies that contribute for an accurate characterization and prediction the service life and the evolution of existing and novel construction materials under normal or extreme environmental exposure or loading conditions. New strategies to promote the smart repairing or the recovery of material properties, as well as the service life extension, are also considered. The following subtopics are included: service life models and multiphysics approaches; smart structures, innovative monitoring and intervention strategies; management and optimized maintenance strategies; integrated rehabilitation and strengthening approaches.
Author : Ravindra K. Dhir
Publisher : Thomas Telford
ISBN 13 : 9780727728258
Total Pages : 512 pages
Book Rating : 4.7/5 (282 download)
Download or read book Specialist Techniques and Materials for Concrete Construction written by Ravindra K. Dhir and published by Thomas Telford. This book was released on 1999 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete will be the key material for Mankind to create the built environment of the next millennium. The requirements of this infrastructure will be both demanding, in terms of technical performance and economy, and yet be greatly varied, from architectural masterpieces to the simplest of utilities.Specialist techniques and materials for concrete construction forms the Proceedings of the three day international conference held during the Congress, creating with concrete, 6-10 September 1999, organised by the Concrete technology unit, University of Dundee.
Author : Alan B. Poole
Publisher : CRC Press
ISBN 13 : 1351722336
Total Pages : 793 pages
Book Rating : 4.3/5 (517 download)
Download or read book Concrete Petrography written by Alan B. Poole and published by CRC Press. This book was released on 2016-12-19 with total page 793 pages. Available in PDF, EPUB and Kindle. Book excerpt: This classic reference has established the value of petrography as a powerful method for the investigation of concrete as a material. It provides an authoritative and well-illustrated review of concrete composition and textures, including the causes of defects, deterioration, and failure that can be identified using a petrological microscope. This new edition is entirely revised and updated and also greatly extended to take account of new scientific developments and significant improvements in instrumentation and to reflect current laboratory working practices, as well as to reflect new understanding of the performance of concrete and related materials. Now in full color throughout, Concrete Petrography, Second Edition provides case study examples, with appropriate explanatory discussions and practical advice on selecting, handling and preparing specimens. It assists and guides the engineer, the trainee and the experienced petrographer in understanding the scientific evidence that is basic to petrographic analysis and so will lead to more accurate and timely diagnosis and treatment of problems in structural concrete. This book includes: Contributions in specialist areas by internationally recognized experts Explanation of computer techniques as an aid to petrography Full coverage of inspection, sampling, and specimen preparation New sections covering recent technological development of equipment Guidance on observation of cement and concrete mineralogy and microfabrics Discussion and illustrative examples of deterioration and failure mechanisms New work and guidance on the determination of water/cement ratio New color illustrations and micrographs throughout Thorough updating of standards, other authoritative publications, and references A fully revised, extended, and updated glossary of optical and other properties
Download or read book Analysis of Air-void System in Hardened Concrete from a Three-dimensional Perspective written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Konstantin Kovler
Publisher : Springer Nature
ISBN 13 : 3030433323
Total Pages : 192 pages
Book Rating : 4.0/5 (34 download)
Download or read book Concrete Durability and Service Life Planning written by Konstantin Kovler and published by Springer Nature. This book was released on 2020-04-28 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers the proceedings of the 3rd International RILEM Workshop on Concrete Durability and Service Life Planning (ConcreteLife’20), held in Haifa, Israel in January 2020. The papers cover a range of topics in concrete curing, cracking in concrete structures, corrosion of steel in concrete, thermal and hygral effects, concrete in cold climates and under high temperatures, recycling, alkali-silica reactions, chloride and sulfate attacks, marine structures, transport phenomena, durability design, microstructure of concrete and volume changes, and life cycle assessment. The book also explores future trends in research, development, and practical engineering applications related to durable concrete construction, and focuses on the design and construction of concrete structures exposed to various environmental conditions and mechanical loading. Given its scope, it offers a valuable asset for all researchers and graduate students in the areas of cement chemistry, cement production, and concrete design.
Author : Karl Peterson
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (47 download)
Download or read book Air Void Analysis of Hardened Concrete Via Flatbed Scanner written by Karl Peterson and published by . This book was released on 2001 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.3/5 (91 download)
Download or read book FHWA Nationally Coordinated Program of Highway Research, Development, and Technology. Annual Progress Report. Fiscal Year 1991 written by and published by . This book was released on 1991 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jeremy Ingham
Publisher : CRC Press
ISBN 13 : 184076600X
Total Pages : 195 pages
Book Rating : 4.8/5 (47 download)
Download or read book Geomaterials Under the Microscope written by Jeremy Ingham and published by CRC Press. This book was released on 2010-12-15 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive guide to the petrography of geomaterials, making the petrographers specialist knowledge available to practitioners, educators and students worldwide interested in modern and historic construction materials.
Author :
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (891 download)
Download or read book Field Study of Air Content Stability in the Slipform Paving Process written by and published by . This book was released on 2012 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the impacts of construction on the air content and air-void system structure of Portland cement concrete pavements. The primary intent was to quantify the air content of fresh concrete before and after it has gone through the slipform paver. The air-void system parameters of hardened concrete were then assessed using cast and extracted core specimens. The results of the air content testing on fresh concrete and the concrete cylinder specimens cast in the field suggested that there is some loss of air as the concrete passes through the paver. Laboratory testing performed on cores extracted from the pavement did not provide any conclusive evidence that entrained air is lost during the slipform paving process. In fact, many of the extracted cores had measured air content values that were much higher than the specification requirement. If excessive, this could result in increased permeability and low-strength related issues. Although a rigorous statistical analysis was not performed, the results suggest that the air content testing on fresh concrete is not capturing the true air content of the concrete placed with a slipform paver. The fresh concrete air content is generally lower than the air content measured in the cores.
