Download or read book Freeze Thaw Durability of Nonair Entrained High Strength Concretes Containing Superplasticizers written by SM. Khalil and published by . This book was released on 1980 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superplasticizing chemical admixtures enable the production of either flowing concrete or concrete with normal workability with very low water/cement (W/C) ratios. The production of low W/C ratio concrete with high strength is of considerable interest to the precast concrete industry. However, it has often proved very difficult, when using superplasticizing chemical admixtures, to entrain an adequate air void system in these low W/C ratio concretes, giving rise to uncertainty regarding the freeze-thaw durability of such concretes. Using ASTM Test for Critical Dilation of Concrete Specimens Subjected to Freezing (C 671 - 77) and Test for Resistance of Concrete to Rapid Freezing and Thawing (C 666 - 77), it is shown that the durability of low W/C ratio, nonair-entrained concrete containing superplasticizers is markedly affected by the aggregate source. Tests conducted on concrete batched at a number of precast concrete plants in Western Canada show that adequate durability may be achieved with some of the principal aggregate sources currently used in precast concrete production.
Download or read book Freezing and Thawing Resistance of High strength Concrete written by Robert E. Philleo and published by . This book was released on 1986 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Durability of Building Materials and Components written by International Conference on Building Materials and Components and published by ASTM International. This book was released on 1980 with total page 1068 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strategies for Enhancing the Freeze thaw Durability of Portland Cement Concrete Pavements written by Steven. M. Cramer and published by . This book was released on 2001 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation Into Freezing thawing Durability of Low Permeability Concrete with and Without Air Entraining Agent written by Kejin Wang and published by . This book was released on 2009 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Freeze Thaw Durability of Concrete written by J. Marchand and published by CRC Press. This book was released on 2004-03-01 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete durability in climates where freezing and thawing occurs is a continuing problem. It is particularly acute for highway and bridge structures, where de-icing salts are used to combat the effects of frost, snow and ice. These salts can cause damage to concrete and accelerate corrosion of reinforcements. This book presents the latest international research on this area, with contributions from North America and Europe which were presented at an international RILEM workshop.
Download or read book Concrete Under Severe Conditions written by Koji Sakai and published by Taylor & Francis US. This book was released on 1995 with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Durability of Concrete in Cold Climates written by M. Pigeon and published by CRC Press. This book was released on 2014-04-21 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and authoritative review of durability of the frost resistance of concrete. It will enable both concrete materials specialists and practising engineers to better understand the deterioration processes which take place during freezing and thawing, and the effects of de-icing salts on concrete. It shows how test pro
Download or read book Freeze thaw Durability of Non air Entrained Concrete with Normal and Lighweight Aggregates written by Steven R. Matheny and published by . This book was released on 2010 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Entrained Air on Resistance to Accelerated Laboratory Freezing and thawing of Concrete Specimens Made with Expanded Lightweight Aggregates written by Waterways Experiment Station (U.S.) and published by . This book was released on 1958 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Durability of Concrete in Cold Climates written by M. Pigeon and published by CRC Press. This book was released on 2010-02-25 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and authoritative review of durability of the frost resistance of concrete. It will enable both concrete materials specialists and practising engineers to better understand the deterioration processes which take place during freezing and thawing, and the effects of de-icing salts on concrete. It shows how test procedures can be used to provide worthwhile information and explains the many problems associated with their use. Durability of Concrete in Cold Climates explains how concrete can be designed and produced to be durable in cold environments, through careful selection of materials, mixture composition and proper use of air entrainment. It is fully illustrated with photographs and diagrams and contains over 250 references to sources and other publications. The main topics covered are: theories of frost ction and de-icer salt scaling mechanisms; laboratory tests; influence of materials and mix characteristics; air entrainment; field performance; and frost durability of dry concretes.
Download or read book Freezing and Thawing of Concrete and Use of Silicones written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1963 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Freeze thaw Durability of Non air Entrained Concrete with Normal and Lightweight Aggregates written by Steven R. Matheny and published by . This book was released on 2010 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Performance Concrete written by Pierre-Claude Aïtcin and published by CRC Press. This book was released on 1998-07-02 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete review of the fast-developing topic of high performance concrete (HPC) by one of the leading researchers in the field. It covers all aspects of HPC from materials, properties and technology, to construction and testing. The book will be valuable for all concrete technologists and construction engineers wishing to take advantage of the re
Download or read book Freezing and thawing Tests of Concretes of Various Strengths and Air Contents written by E. C. Roshore and published by . This book was released on 1967 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Durability of Marker Materials for Nuclear Waste Isolation Sites written by Warren E. Berry and published by . This book was released on 1983 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Durability of Concrete written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1956 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the first report adequate resistance to freezing and thawing was obtained when the air content of the mortar fraction was in the range of 9 plus or minus 1 per cent. The report also includes information on the effect of entrained air on strength, resistance to salt scaling, volume change and absorption of these concretes. The second report is a resume to date of investigations conducted to test materials and procedures for protecting concrete pavements against scaling and disintegration caused by calcium chloride and other thawing agents used for ice removal.
