Investigation Of Proprietary Air Entraining Admixtures To Produce Frost Resistant Concrete With Low Air Content
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Investigation Of Proprietary Air Entraining Admixtures To Produce Frost Resistant Concrete With Low Air Content
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Author : Billy D. Neeley
language : en
Publisher:
Release Date : 1992
Investigation Of Proprietary Air Entraining Admixtures To Produce Frost Resistant Concrete With Low Air Content written by Billy D. Neeley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Air-entrained concrete categories.
Investigation Of Proprietary Admixtures
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Author : William O. Tynes
language : en
Publisher:
Release Date : 1977
Investigation Of Proprietary Admixtures written by William O. Tynes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Air-entraining cements categories.
Laboratory Investigation Of Air Void Systems Produced By Air Entraining Admixtures In Fresh And Hardened Mortar
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Author : Daniel Stephen Lane
language : en
Publisher:
Release Date : 2006
Laboratory Investigation Of Air Void Systems Produced By Air Entraining Admixtures In Fresh And Hardened Mortar written by Daniel Stephen Lane and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Air-entrained concrete categories.
The air-void systems produced by two commercially available air-entraining admixtures (AEA), one a vinsol resin formulation and the other a tall oil formulation, were studied in mortars. Mortars were composed of four different portland cements and two Class F fly ashes (20 percent by mass) with concrete sand. The mortar proportions were based on Virginia Department of Transportation Class A4 concrete with a water-cementitious material ratio of 0.45. Foam index tests were conducted on all cementitious combinations, and the results were used to determine the dosage of AEA in the mortars. The air content of the mortars was determined gravimetrically, and specimens were cast for subsequent linear traverse analysis of the air-void system. With both AEAs, mortar air contents in the target range produced spacing factors much lower than necessary to provide resistance to freezing and thawing, suggesting that the ranges for air content currently used in VDOT specifications could be reduced to lessen the potential for acceptance problems associated with excessive air content. Further study is recommended to verify that the relationships observed in this study are also observed in concrete and to define improved air content specifications.
Annual Department Of Defense Bibliography Of Logistics Studies And Related Documents
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Author : United States. Defense Logistics Studies Information Exchange
language : en
Publisher:
Release Date : 1993
Annual Department Of Defense Bibliography Of Logistics Studies And Related Documents written by United States. Defense Logistics Studies Information Exchange and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Military research categories.
Quarterly Supplement To The Annual Department Of Defense Bibliography Of Logistics Studies And Related Documents
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Author : United States. Defense Logistics Studies Information Exchange
language : en
Publisher:
Release Date : 1992
Quarterly Supplement To The Annual Department Of Defense Bibliography Of Logistics Studies And Related Documents written by United States. Defense Logistics Studies Information Exchange and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Military research categories.
Evaluating Air Entraining Admixtures For Highway Concrete
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Author : Mohamad Nagi
language : en
Publisher: Transportation Research Board
Release Date : 2007
Evaluating Air Entraining Admixtures For Highway Concrete written by Mohamad Nagi and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Air-entrained concrete categories.
"This report presents a recommended procedure for evaluating air-entraining admixtures used in highway concrete. The procedure involves the testing of non-air-entrained concrete and concrete containing the air-entraining admixture under simulated field conditions. Criteria are proposed for acceptance of admixtures for use in either highway pavements or structures. The recommended procedure and acceptance criteria will guide materials engineers in evaluating and selecting air-entraining admixtures that should contribute to appropriate freeze-thaw durability and thus to good performance and long service life. The content of the report will be of immediate interest to materials engineers, researchers, and others concerned with the design of concrete mixtures for use in highway pavements and structures."--taken from Foreword, page [v].
Investigation Into Freezing Thawing Durability Of Low Permeability Concrete With And Without Air Entraining Agent
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Author : Kejin Wang
language : en
Publisher:
Release Date : 2009
Investigation Into Freezing Thawing Durability Of Low Permeability Concrete With And Without Air Entraining Agent written by Kejin Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Concrete categories.
The aim of the present study is to investigate the effect of low-permeability concrete, made with reduced water-to-binder ratios (w/b) and/or supplementary cementitious materials (SCMs), on the need for air entrainment to achieve freezing-thawing (F-T) durability. In the present study, concrete mixes were made with different types of cement (Type I and IP), with or without fly ash replacement (15%), with different water-to-binder ratios (w/b=0.25, 0.35, 0.45 and 0.55), and with or without air entraining agent (AEA). All concrete mixtures were controlled to have a similar slump by using different dosages of superplasticizer. The rapid chloride permeability and F-T durability of the concrete samples were determined according to ASTM C1202 and ASTM C666A, respectively. The air void structure of the concrete was studied using the Air Void Analyzer, Rapid Air, and porosity tests (ASTM C642). In addition, the general concrete properties, such as slump, air content, unit weight, and 28-day compressive strength, were evaluated. The results indicate that all concrete mixes with proper air entrainment (ASTM C23 air content greater than or equal to 6%) showed good F-T resistance (durability factor greater than or equal to 86%). All concrete mixes without AEA showed poor F-T resistance (durability factor less than 40%), except for one mix that had very low permeability and high strength. This was the concrete made with Type IP cement and with a w/b of 0.25, which had a permeability of 520 coulombs and a compressive strength of 12,760 psi (88 MPa). There were clear relationships between the F-T durability and hardened concrete properties of non-air entrained concrete. However, such relationships did not exist in concrete with AEA. For concrete with AEA, good F-T durability was associated with an air void spacing factor less than or equal to 0.28 mm (by AVA) or less than or equal to 0.22 mm (by RapidAir).
Investigation Of Resistance Of Preplaced Aggregate Concrete To Freezing And Thawing
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Author : William O. Tynes
language : en
Publisher:
Release Date : 1968
Investigation Of Resistance Of Preplaced Aggregate Concrete To Freezing And Thawing written by William O. Tynes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Aggregates (Building materials) categories.
List Of Publications Of The U S Army Engineer Waterways Experiment Station
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Author : U.S. Army Engineer Waterways Experiment Station
language : en
Publisher:
Release Date : 1993
List Of Publications Of The U S Army Engineer Waterways Experiment Station written by U.S. Army Engineer Waterways Experiment Station and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Coastal engineering categories.
Freezing And Thawing Resistance Of High Strength Concrete
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Author : Robert E. Philleo
language : en
Publisher:
Release Date : 1986
Freezing And Thawing Resistance Of High Strength Concrete written by Robert E. Philleo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Technology & Engineering categories.
Recent developments have made a new generation of high-strength concrete a viable material for routine construction. The two principal developments are high-range water-reducing admixtures, which permit the placement of concrete of very low water-cement ratio, and silica fume, a pozzolan of extremely high fineness. The advent of this high- strength concrete has put requirements for strength and durability in conflict. Because entrained air reduces the strength of concrete, builders seek to eliminate or limit the use of entrained air. There are those who argue that high-strength concrete is of such a quality that entrained air is unnecessary. Much of the high-strength concrete currently being used is in buildings, where the question of durability is minor. The question, however, cannot be avoided in exposed highway structures. Service records of non-air-entrained high-strength concrete exposed to freezing are not conclusive. Hence, this report synthesizes the available knowledge on the subject. Its aim is to provide guidance to those who wish to use high-strength concrete in typical highway applications and to indicate where further information is needed.