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Control Of Air Content In Concrete
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Book Synopsis Manual on Control of Air Content in Concrete by : David Whiting
Download or read book Manual on Control of Air Content in Concrete written by David Whiting and published by . This book was released on 1998 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control of Air Content in Concrete by : David Whiting
Download or read book Control of Air Content in Concrete written by David Whiting and published by Transportation Research Board National Research. This book was released on 1983 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Properties of Air Bubbles in Air Entrained Concrete by : Le Tuan Pham
Download or read book Properties of Air Bubbles in Air Entrained Concrete written by Le Tuan Pham and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is widely accepted that air entrainment, a purposeful introduction of small air bubbles in concrete, is critical to the long-term durability of concrete in freeze-thaw environments. Air entraining admixtures (AEA) are added to the mixture to stabilize air bubbles created during mixing, ensuring a proper air void system in the hardened concrete. Despite the complexity of creating a suitable air void system in concrete, previous study and experience established the reliability and robustness of such systems under a variety of conditions through use of neutralized vinsol resin (NVR) AEA products. In recent years, synthetic AEAs have been used more frequently due to limited supply of NVR to the concrete industry. With the use of synthetic AEAs, there are more reports of new problems including difficulties in accurately measuring the air content. This study was conducted to find the root cause of the increasing difficulties in controlling the air contents in portland cement concrete associated with synthetic AEAs. Main challenges included the lack of existing techniques to evaluate AEAs and air bubbles in concrete, and lack of data to help identify causes. Given these challenges, a multi-scale experimental study that included testing of field and laboratory concrete, and testing of foam and individual air bubbles was undertaken. The results indicate that the disparity between QC test results and the actual air contents in concrete pavements associated with the use of synthetic AEAs could be attributed to less robust air bubbles stabilized with synthetic AEAs compared to those entrained with NVR and the resulting increased loss of these air bubbles during concrete sampling. The cause of this decreased robustness and resulting air loss was traced directly to the properties of the bubble shells. The shells of air bubbles in concrete entrained with synthetic AEAs were thinner and less stiff than those associated with an NVR AEA. Through this research new test protocols were developed to measure stiffness and thickness of the shell of air bubbles extracted from cement paste and to quantify stability of foams of AEAs in a cementitious environment. These tests could be used by researchers and practitioners who are interested in developing new admixtures and/or identifying admixtures with undesirable performance.
Author :United States. Department of the Interior. Water and Power Resources Service Publisher : ISBN 13 : Total Pages :672 pages Book Rating :4.:/5 ( download)
Book Synopsis Concrete Manual by : United States. Department of the Interior. Water and Power Resources Service
Download or read book Concrete Manual written by United States. Department of the Interior. Water and Power Resources Service and published by . This book was released on 1975 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Information and Instructions for Use of Airentraining Admixtures in Concrete by : United States. Bureau of Reclamation
Download or read book Information and Instructions for Use of Airentraining Admixtures in Concrete written by United States. Bureau of Reclamation and published by . This book was released on 1946 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Concrete Manual by : United States. Bureau of Reclamation
Download or read book Concrete Manual written by United States. Bureau of Reclamation and published by . This book was released on 1963 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Portland Cement Association Publisher :[Skokie, Ill.] : Portland Cement Association : rev. and distributed in Canada by Canada Cememt Company ISBN 13 : Total Pages :140 pages Book Rating :4.X/5 (1 download)
Book Synopsis Design and Control of Concrete Mixtures by : Portland Cement Association
Download or read book Design and Control of Concrete Mixtures written by Portland Cement Association and published by [Skokie, Ill.] : Portland Cement Association : rev. and distributed in Canada by Canada Cememt Company. This book was released on 1968 with total page 140 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 Air Entrainment in Concrete Design by : Waterways Experiment Station (U.S.)
Download or read book Air Entrainment in Concrete Design written by Waterways Experiment Station (U.S.) and published by . This book was released on 1947 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Freezing and Thawing of Concrete by : William A. Cordon
Download or read book Freezing and Thawing of Concrete written by William A. Cordon and published by . This book was released on 1966 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discussion of the behaviour of various concrete structures exposed to freezing and thawing is followed by theories regarding mechanisms which cause this behaviour, and methods of preventing concrete deterioration.
Book Synopsis Evaluating the Air Content Changes in Hydraulic Concrete Due to Pumping by :
Download or read book Evaluating the Air Content Changes in Hydraulic Concrete Due to Pumping written by and published by . This book was released on 2002 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Wyoming Department of Transportation (WYDOT) is in the process of implementing new quality control and quality assurance (QC/QA) specifications for Portland Cement Concrete (PCC). WYDOT specifications require 4.0-7.0% air content in the "in place" concrete. Air content at the point of placement is a major component in determining the payment received by the contractor. Air content, along with other properties, of concrete before and after pumping was measured in 36 construction projects in two phases. Phase I indicated that the air content during pumping is on average a loss of 1.2%. Phase II indicated that sampling methods have a moderate effect on the measured air
Book Synopsis Air Entrainment in Concrete by : American Concrete Institute
Download or read book Air Entrainment in Concrete written by American Concrete Institute and published by . This book was released on 1947 with total page 218 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 Specifications for Structural Concrete, ACI 301-05, with Selected ACI References by : American Concrete Institute
Download or read book Specifications for Structural Concrete, ACI 301-05, with Selected ACI References written by American Concrete Institute and published by American Concrete Institute. This book was released on 2005 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control of Air Content in Concrete by : David Whiting
Download or read book Control of Air Content in Concrete written by David Whiting and published by . This book was released on 1983 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Concrete Technology by : Portland Cement Association
Download or read book Concrete Technology written by Portland Cement Association and published by . This book was released on 1965 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Water-reducing Admixtures for Concrete by : U.S. Army Engineer Waterways Experiment Station
Download or read book Investigation of Water-reducing Admixtures for Concrete written by U.S. Army Engineer Waterways Experiment Station and published by . This book was released on 1961 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: