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Entrained Air Void System For Durable Highway Concrete
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Book Synopsis Entrained Air-void Systems for Durable Highway Concrete by : Peter Clement Taylor
Download or read book Entrained Air-void Systems for Durable Highway Concrete written by Peter Clement Taylor and published by . This book was released on 2021 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laboratory testing and field experience have shown that highway concrete should be properly air entrained to resist the action of freezing and thawing, particularly in wet climates. Several gaps in the state of the knowledge still exist. The TRB National Cooperative Highway Research Program's NCHRP Research Report 961: Entrained Air-Void Systems for Durable Highway Concrete addresses these gaps and, more specifically, investigates innovative test methods for effectively characterizing the air system in fresh concrete and identifying the characteristics of the air-void system that are related to the performance of field concrete under freeze-thaw conditions. Appendices A -G provide further details on the different aspects of the research performed for this project.
Book Synopsis Enhanced Entrained Air Void System Characterization for Durable Highway Concrete by : Anthony Torres
Download or read book Enhanced Entrained Air Void System Characterization for Durable Highway Concrete written by Anthony Torres and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The air void system in concrete provides a strong influence on the behavior of cementitious materials in both the fresh and hardened state, especially as it relates to freeze-thaw resistance and deicer scaling. The most common test procedure to characterize the air void system is ASTM C457 – Standard Test method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete, which involves microscopic determination of the air content, paste content, air-void size distribution, and spatial dispersion of a sawn concrete sample. This procedure is reliant on the user to make hundreds of critical decisions per sample, which requires significant time, and is potentially subject to human error. Additionally, ASTM C457 provides minimal guidance regarding the exact steps and equipment necessary to prepare a sample for evaluation. The outcome of this research not only provides specific information regarding sample preparation for hardened concrete air void analysis, it also develops an alternative characterization technique that drastically minimizes evaluation time, human error, and increases reliability of key hardened air void characterization parameters. Specific results show on average air void difference of 0.5% and 0.7% between the alternative method versus ASTM C457 Procedure A and B, respectively. The results also show a significant reduction of analysis time from approximately 2 – 4 hours per sample to 15 minutes per sample when using the alternative method.
Book Synopsis Entrained Air-Void System For Durable Highway Concrete by : Siamak Riyazi
Download or read book Entrained Air-Void System For Durable Highway Concrete written by Siamak Riyazi and published by . This book was released on 2020 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the US, the most commonly used F-T test method is AASHTO T 161 “A.” The equipment for variant A of the test is relatively low cost (~$22, 000) and compact. The relatively low cost stems from the basic construction of a refrigerant-based cooling system and resistive heating elements. These units are easily repaired by conventionally trained heating and air conditioning technicians and economically modified using readily available controls. Consequently, proposed factors and modifications to the test method are based on this piece of equipment. Sufficient background information exists in the research literature and current global applications to recommend improvements/modifications to the F-T test method, such as changes to the cooling rate, degree of saturation, and sample conditioning method. Based on an analysis of significant factors reported in the literature, in this study, a series of procedural and functional changes were proposed to better describe F-T durability as a function of the air void system. These changes include: 1- Procedural modifications including longer curing times to better encompass requirements for higher SCM mixtures and the introduction of a drying period to better simulate actual field exposure conditions, 2- Functional modifications including introducing water through capillary suction and changing the freezing solution to incorporate deicing salts, 3- A combination of modification approaches including application of a concentrated pre-storm brine followed by drying.The F-T research was performed in three phases. The first phase involved calibration and modification of the AASHTO T 161 “A” freeze-thaw cabinet using the proposed CDF-A procedure. A modification procedure was developed, and an appendix to the final report was described the steps taken to achieve the desired test requirements. The second phase involved evaluating three separate variants of the proposed test not encompassed by current test methods including the impact of curing time, deicer type, and deicer pretreatment. The third phase involved evaluating a wide range of concrete samples with varying levels and qualities of air systems.
Book Synopsis Evaluating Air-entraining Admixtures for Highway Concrete by : Mohamad Nagi
Download or read book Evaluating Air-entraining Admixtures for Highway Concrete written by Mohamad Nagi and published by Transportation Research Board. This book was released on 2007 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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].
Book Synopsis Entrained Air-void Systems for Durable Highway Concrete by : Peter Clement Taylor
Download or read book Entrained Air-void Systems for Durable Highway Concrete written by Peter Clement Taylor and published by . This book was released on 2021 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laboratory testing and field experience have shown that highway concrete should be properly air entrained to resist the action of freezing and thawing, particularly in wet climates. Several gaps in the state of the knowledge still exist. The TRB National Cooperative Highway Research Program's NCHRP Research Report 961: Entrained Air-Void Systems for Durable Highway Concrete addresses these gaps and, more specifically, investigates innovative test methods for effectively characterizing the air system in fresh concrete and identifying the characteristics of the air-void system that are related to the performance of field concrete under freeze-thaw conditions. Appendices A -G provide further details on the different aspects of the research performed for this project.
Book Synopsis Laboratory Investigation of Air-void Systems Produced by Air-entraining Admixtures in Fresh and Hardened Mortar by : Daniel Stephen Lane
Download or read book Laboratory Investigation of Air-void Systems Produced by Air-entraining Admixtures in Fresh and Hardened Mortar written by Daniel Stephen Lane and published by . This book was released on 2006 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Physical Factors Influencing Resistance of Concrete to Deicing Agents by : W. R. Malisch
Download or read book Physical Factors Influencing Resistance of Concrete to Deicing Agents written by W. R. Malisch and published by . This book was released on 1966 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies were made of the effects of varying concrete production methods upon potentially durable concrete. Variations in the surface porosity, strength and air void system produced by differing finishing techniques were evaluated for typical air-entrained concretes. Large and small scale specimens were cast and effects of period and time of finishing, environmental conditions, and additions of water during finishing were evaluated using surface scaling tests, surface tensile strength tests and microscopical determination of surface air void parameters. If a concrete is to remain durable when deicing agents are used, it must have proper air entrainment and curing.
Book Synopsis Air-entraining Admixtures by : Paul Klieger
Download or read book Air-entraining Admixtures written by Paul Klieger and published by . This book was released on 1966 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory of Air Entrainment by : Abdul Hameed Khan
Download or read book Theory of Air Entrainment written by Abdul Hameed Khan and published by . This book was released on 1949 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Air Entrainment in Mass Concrete by : William O. Tynes
Download or read book Air Entrainment in Mass Concrete written by William O. Tynes and published by . This book was released on 1969 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Air Voids in Concrete and Characteristics of Aggregates by : National Research Council (U.S.). Highway Research Board
Download or read book Air Voids in Concrete and Characteristics of Aggregates written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1958 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Paper 1: A study of carbonate rocks used for concrete aggregate was conducted for the Iowa State Highway Commission to determine the factors in the aggregate causing distress in concrete and to establish criteria for recognizing potentially poor aggregates. Paper 2: The theory of the action of entrained air in producing frost-resistant concrete demonstrates the importance of the size and distribution of the air voids in the Portland cement paste. Paper 3: A summary of the results of the chemical study of carbonate rocks from several quarries in Northeast Iowa which produced carbonate aggregate for highway pavement concrete is presented.
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 Application of Admixtures in Concrete by : A.M. Paillere
Download or read book Application of Admixtures in Concrete written by A.M. Paillere and published by CRC Press. This book was released on 2004-03-01 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a thorough review of the properties and use of the principal chemical admixtures for use in concrete. Concise and clearly presented, the book includes extensive references to key sources of information. The presentation of each admixture is in a standard format, which helps the reader to find relevant information easily.
Book Synopsis Studies of the Effect of Entrained Air on the Strength and Durability of Concretes Made with Various Maximum Sizes of Aggregate by : Paul Klieger
Download or read book Studies of the Effect of Entrained Air on the Strength and Durability of Concretes Made with Various Maximum Sizes of Aggregate written by Paul Klieger and published by . This book was released on 1952 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of the Cause and Effect of Air Void Coalescence on Air Entrained Concrete Mixes by :
Download or read book Investigation of the Cause and Effect of Air Void Coalescence on Air Entrained Concrete Mixes written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Air entraining admixtures (vinsol or non-vinsol) are used in concrete mixes that will be exposed to freeze-thaw cycles or sulfate attack. Entrained air is intended to improve the durability and resistance of hardened concrete to freeze-thaw cycles. However in many instances a significant loss of compressive strength has been observed in concrete mixes containing non-vinsol admixtures. Mixture forensic analysis has determined air void coalescing to be the main factor in observed low compressive strengths. The result of air void coalescing is the over design of compressive strength to account for the possible lower strengths and decreased confidence in the compressive strengths obtained during the quality control/assurance process.
Book Synopsis FHWA Nationally Coordinated Program of Highway Research, Development, and Technology. Annual Progress Report. Fiscal Year 1992 by :
Download or read book FHWA Nationally Coordinated Program of Highway Research, Development, and Technology. Annual Progress Report. Fiscal Year 1992 written by and published by . This book was released on 1992 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Guidelines for Early-opening-to-traffic Portland Cement Concrete for Pavement Rehabilitation by : Thomas John Van Dam
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:
