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Author : Fulton Keller Fears
Publisher :
ISBN 13 :
Total Pages : 206 pages
Book Rating : 4.:/5 (181 download)
Download or read book A Study of the Air-void Characteristics of Hardened Concrete written by Fulton Keller Fears and published by . This book was released on 1957 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (12 download)
Download or read book Air void characteristics of hardened concrete written by and published by . This book was released on 1985 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observations at the Research Council, coupled with the national interest in possible changes in the air void characteristics of air-entrained concretes because of the wide use of admixtures and changes in cement properties, raised a question as to whether or not there was a progressive increase over the years in the size of air voids being incorporated in concrete. Thus, the main objective of the study reported here was to evaluate the changes in air void characteristics of hardened concrete as determined by ASTM C457 and by other means for concrete produced in Virginia from 1945 to 1980. Air void parameters including the air content, specific surface, and spacing factor --were determined on 630 concretes. The results did not indicate an overall significant increase in the size of air voids; however, it was observed that, in general, they did show that the average size and the distribution of the voids were marginal compared to generally accepted values. While this finding indicates that air voids may not be as small as optimum, the freeze-thaw performance of air-entrained concretes in Virginia supplied under the present specifications generally has been satisfactory.
Author : Handi Celik Ozyildirim
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (126 download)
Download or read book Final Report written by Handi Celik Ozyildirim and published by . This book was released on 1985 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ryan David Foley
Publisher :
ISBN 13 :
Total Pages : 282 pages
Book Rating : 4.:/5 (89 download)
Download or read book Strength, Shrinkage, Hardened Air Void Characteristics of Concrete Containing Slag Cement written by Ryan David Foley and published by . This book was released on 2006 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Duane E. Amsler
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.:/5 (359 download)
Download or read book Techniques for Measuring Air Void Characteristics of Concrete written by Duane E. Amsler and published by . This book was released on 1973 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. Pleau
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (125 download)
Download or read book Practical Considerations Pertaining to the Microscopical Determination of Air Void Characteristics of Hardened Concrete (ASTM C 457 Standard) written by R. Pleau and published by . This book was released on 1990 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many parameters affecting the quality of the air void characteristics measurement are reviewed and discussed. The difficulties more frequently encountered during the measurement process are described, and some simple rules are proposed in order to increase, as much as possible, the accuracy and reproducibility of the test. The influence of the sampling size is studied, and the variability of air content, specific surface, and spacing factor is estimated from a statistical analysis of about 600 different concrete mixtures. The influence of the operator's subjectivity is also investigated, and the effect produced by large air voids on the computation of the spacing factor is discussed.
Author : Hamdi Celik Ozyildirim
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (359 download)
Download or read book Distribution of Voids in Field Concrete written by Hamdi Celik Ozyildirim and published by . This book was released on 1978 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was intended to evaluate the air void characteristics of concrete in an attempt to identify, quantitatively or semi-quantitatively, different types of voids and to predict their influence on strength and durability. At the outset, it was anticipated that total air contents and water-- cement ratios of concrete mixtures would reflect the presence of excess water or air voids. However, because it is difficult to determine the water-cement ratio of hardened concrete, an attempt was made to relate the water-cement ratio and the air content, taken as independent variables, to the parameters of the void system that are .readily determined from the hardened concrete. The parameters of the void system considered were 1. The specific surface and the spacing factor calculated from linear traverse data. 2. The constants of a continuous chord frequency distribution curve derived from a probability density function. 3. The mean diameters and the number of bubbles per unit volume determined by a graphical method. The concrete samples were prepared in the laboratory, and the variables included the amount of air entrainment, the water cement ratio, the mixing time, and the mixture temperature. The data on the void system were obtained by utilizing the chord lengths of voids determined by the linear traverse analysis of concrete specimens. Within the framework of the study it was not possible to correlate the combined effect of water and air content with the above mentioned void parameters. A good correlation was obtained between the air contents of fresh and hardened concretes that were properly measured. Satisfactory relationships were established between the measures of resistance to freezing and thawing (weight loss, relative dynamic modulus of elasticity, and the surface rating), and certain parameters-of the void system (the spacing factor, the specific surface, and the diameter of the bubbles).
Author : Curtis Warren
Publisher :
ISBN 13 :
Total Pages : 350 pages
Book Rating : 4.:/5 (89 download)
Download or read book Development and Application of a Method for Analyzing the Voids in Hardened Concrete written by Curtis Warren and published by . This book was released on 1951 with total page 350 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 : Lokman Ng
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (656 download)
Download or read book Studying Air Properties in Hardened Portland Cement Concrete with Linear Traverse Method written by Lokman Ng and published by . This book was released on 2010 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air void structure in hardened concrete is critical to its durability. This project mainly focuses on investigating the air void system in hardened concrete with the microscopic analysis Linear Traverse Method specified by ASTM Specification C457-08 (Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete). To understand the stability of the air void system in concrete, the same concrete mixes were examined with two other methods, pressure meter measurement and Air-Void Analyzer, under fresh state. The comparison of the results from the three methods for fresh and hardened concrete shows that properties of concrete vary in samples within the same batch with the same mix design, samples in different batches of the same mix design and samples with different mix designs. The measured air content from Linear Traverse Method and pressure meter are fairly close to each other, while Air-Void Analyzer measured air content is observed to be lower than that from Linear Traverse Method. The measured spacing factor from Air-Void Analyzer is observed to be higher than that from Linear Traverse Method, while the measured specific surface from Air-Void Analyzer is observed to be lower than that from Linear Traverse Method. However, no strong correlation in the measured air content and measured specific surface between Linear Traverse and Air-Void Analyzer is observed.
Author : National Research Council (U.S.). Highway Research Board
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (359 download)
Download or read book Air-entrained Concrete written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1953 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paper 1: A method was developed which makes it possible to determine the characteristics of the entrained air voids in concrete. Briefly, the procedure consisted of cutting and polishing a section of concrete to expose the distributed voids. Paper 2: The performance record is described of 14 concrete test roads in five northeastern states. Built 10 to 14 years ago with a wide range of variables, these roads provide an opportunity to compare the performance of air-entrained concrete with adjacent sections of the same construction but without air entrainment.
Author : British Standards Institute Staff
Publisher :
ISBN 13 : 9780580307942
Total Pages : 16 pages
Book Rating : 4.3/5 (79 download)
Download or read book Admixtures for Concrete, Mortar and Grout. Test Methods. Determination of Air Void Characteristics in Hardened Concrete written by British Standards Institute Staff and published by . This book was released on 1999-02-01 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 : Paul Klieger
Publisher : ASTM International
ISBN 13 : 0803120532
Total Pages : 621 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 Paul Klieger and published by ASTM International. This book was released on 1994 with total page 621 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 : Thomas John Van Dam
Publisher : Transportation Research Board
ISBN 13 : 0309088356
Total Pages : 38 pages
Book Rating : 4.3/5 (9 download)
Download or read book Guidelines for Early-opening-to-traffic Portland Cement Concrete for Pavement Rehabilitation written by Thomas John Van Dam and published by Transportation Research Board. This book was released on 2005 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kalliopi K. Aligizaki
Publisher : CRC Press
ISBN 13 : 9780419228004
Total Pages : 442 pages
Book Rating : 4.2/5 (28 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 442 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 analyze experimental data, and the factors affecting the results. The book is the single comprehensive source of the techniques most commonly used for pore structure analysis, covering simple techniques like mercury intrusion porosimetry and water absorption, to the more sophisticated small-angle scattering and nuclear magnetic resonance. The book is an essential reference text for researchers, users, and students in materials science, applied physics, and civil engineering, who seek a deep understanding of the principles and limitations of the techniques used for pore structure analysis of cement-based materials.
