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Correlation Of Air Void Parameters Obtained By Linear Traverse With Freeze Thaw Durability
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Book Synopsis Correlation of Air Void Parameters Obtained by Linear Traverse with Freeze-thaw Durability by : Hollis N. Walker
Download or read book Correlation of Air Void Parameters Obtained by Linear Traverse with Freeze-thaw Durability written by Hollis N. Walker and published by . This book was released on 1983 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The correlations obtainable from comparisons of the various air void parameters with the freeze-thaw durability of concretes are listed. It is shown that correlations are no better when only small voids are used than when the total void content is used. It is concluded that for most concretes, (1) the void parameters required by ASTM C-457 produce sufficient information to delineate the character of the air void system, and (2) that parameters such as the specific surface fore small voids only and the spacing factor for the proportional number of small voids add no useful information when the demarcation between large and small voids is at 1 mm diameter expressed on the plane of examination. It is recommended (1) that any further research deal with the entire void distribution by using the chord length distributions, and (2) that the various kinds of concrete be tabulated separately.
Book Synopsis Correlation of Hardened Concrete Air-Void Parameters Obtained by Linear Traverse with Freeze-Thaw Durability as Found by ASTM C 666 by : HN. Walker
Download or read book Correlation of Hardened Concrete Air-Void Parameters Obtained by Linear Traverse with Freeze-Thaw Durability as Found by ASTM C 666 written by HN. Walker and published by . This book was released on 1984 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spacing factor for the proportional number of small air voids ̄Lps as proposed by Walker in 1980 and the air-void parameters normally obtained by ASTM Practice for Microscopical Determination of Air-Void Content and Parameters of the Air-Void System in Hardened Concrete (C 457) were each correlated with the durability factor and weight loss found by ASTM Test for Resistance of Concrete to Rapid Freezing and Thawing (C 666) Procedure A for 151 concretes. The correlation coefficients were examined, and it was found that for the durability factor the classical spacing factor from ASTM C 457 gave a slightly but not significantly better correlation than did ̄Lps. The 151 concretes were divided into three groups according to their source. In no case did the correlation obtained from ̄Lps significantly exceed the spacing factor calculated from ASTM C 457.
Book Synopsis Expert/knowledge-based Systems for Cement and Concrete by : Lawrence J. Kaetzel
Download or read book Expert/knowledge-based Systems for Cement and Concrete written by Lawrence J. Kaetzel and published by . This book was released on 1991 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Significance of Tests and Properties of Concrete and Concrete-making Materials by : Joseph F. Lamond
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:
Book Synopsis Cement, Concrete and Aggregates by :
Download or read book Cement, Concrete and Aggregates written by and published by . This book was released on 1990 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microscopic Air Void Analysis of Hardened Portland Cement Concrete by the Isolated Shadow Technique by : Basil Mark Harris
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:
Book Synopsis Distribution of Voids in Field Concrete by : Hamdi Celik Ozyildirim
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).
Download or read book Concrete Abstracts written by and published by . This book was released on 1984 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Field Study of Air Content Stability in the Slipform Paving Process by :
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.
Book Synopsis Effect of Vibration on the Air Void Parameters and Freezing-thawing Resistance of Air-entrained Concrete by : J. E. Backstrom
Download or read book Effect of Vibration on the Air Void Parameters and Freezing-thawing Resistance of Air-entrained Concrete written by J. E. Backstrom and published by . This book was released on 1957 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis INFLUENCE OF AIR-VOID SYSTEM ON FREEZE-THAW DURABILITY OF CONCRETE. by : ZAFAR AHMED MALIK
Download or read book INFLUENCE OF AIR-VOID SYSTEM ON FREEZE-THAW DURABILITY OF CONCRETE. written by ZAFAR AHMED MALIK and published by . This book was released on 1991 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-way analysis of variance showed that type of air entraining agent, quality of aggregate, and content of condensed silica fume have a major effect on freeze-thaw durability of concrete.
Book Synopsis Durability of Bridge Deck Concrete by : Thomas D. Larson
Download or read book Durability of Bridge Deck Concrete written by Thomas D. Larson and published by . This book was released on 1967 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Check-list of Virginia State Publications by :
Download or read book Check-list of Virginia State Publications written by and published by . This book was released on 1983 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Public Roads written by and published by . This book was released on 2003 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magazine of Concrete Research written by and published by . This book was released on 1983 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Checklist of State Publications by : Library of Congress. Exchange and Gift Division
Download or read book Monthly Checklist of State Publications written by Library of Congress. Exchange and Gift Division and published by . This book was released on 1983 with total page 926 pages. Available in PDF, EPUB and Kindle. Book excerpt: June and Dec. issues contain listings of periodicals.
Book Synopsis Journal of the American Concrete Institute by : American Concrete Institute
Download or read book Journal of the American Concrete Institute written by American Concrete Institute and published by . This book was released on 1983 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each number includes "Synopsis of recent articles."
