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Frost Resistance of Concrete by R Auberg,M.J. Setzer Pdf
This book forms the proceedings of the international workshop to be held in Essen, Germany. This workshop summarises the conclusion of the technical committee's investigations into the resistance of concrete to freeze-thaw attack, specific in this to resistance with or without de-icing chemicals. It presents the RILEM recommendations on testing the freeze-thaw and de-icing salt resistance of concrete.
Resistance of Concrete to Freezing and Thawing by Donald J. Janssen,Mark B. Snyder Pdf
This study, aimed at improving the freeze-thaw resistance of concrete, consists of three parts. Part I evaluates parameters affecting the freeze-thaw durability of concrete. A modification of the existing standard of method for determining the durability factor of concrete specimens is proposed, and a new procedure for fundamental transverse frequency (used in durability factor calculations) has been developed. Part II focuses on developing better methods for identifying nondurable aggregates, and has resulted in a rapid new test based on the hydraulic fracture of aggregates. Part III describes field experiments to evaluate the freeze-thaw resistance of a number of specified concrete mixes and the use of sealants to mitigate D-cracking. Preliminary field performance results are presented.
Freeze-Thaw Durability of Concrete by J. Marchand,M. Pigeon,M.J. Setzer Pdf
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.
Mark B. Snyder,Donald J. Janssen,Strategic Highway Research Program (U.S.),Michigan State University,University of Washington
Author : Mark B. Snyder,Donald J. Janssen,Strategic Highway Research Program (U.S.),Michigan State University,University of Washington Publisher : Unknown Page : 440 pages File Size : 53,7 Mb Release : 1992 Category : Frost resistant concrete ISBN : OCLC:871038998
Resistance of Concrete to Freezing and Thawing by Mark B. Snyder,Donald J. Janssen,Strategic Highway Research Program (U.S.),Michigan State University,University of Washington Pdf
Freezing and Thawing of Concrete by William A. Cordon Pdf
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.
Freeze-thaw Resistance of Concrete with Marginal Air Content by Jussara Tanesi Pdf
Freeze-thaw resistance is a key durability factor for concrete pavements. Recommendations for the air void system parameters are normally: 6 ± 1 percent total air, and spacing factor less than 0.20 millimeters. However, it was observed that some concretes that did not possess these commonly accepted thresholds presented good freeze-thaw resistance in laboratory studies. This study evaluated the freeze-thaw resistance of several "marginal" air void mixes, with two different types of air-entraining admixtures (AEA)-a Vinsol resin and a synthetic admixture. This study used rapid cycles of freezing and thawing in plain water, in the absence of deicing salts. For the specific materials and concrete mixture proportions used in this project, the marginal air mixes (concretes with fresh air contents of 3.5 percent or higher) presented an adequate freeze-thaw performance when Vinsol resin based air-entraining admixture was used. The synthetic admixture used in this study did not show the same good performance as the Vinsol resin admixture
Freezing and Thawing Resistance of High-strength Concrete by Robert E. Philleo,National Research Council (U.S.). Transportation Research Board Pdf
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.
Structural Concrete Textbook Vol. 1, first edition by fib Fédération internationale du béton Pdf
The development of reinforced and prestressed concrete during the last 50 years was highly promoted by the ”Comité Euro-international du Béton (CEB)“ and the ”Fédération Internationale de la Précontrainte (FIP)“. In 1998 these two associations merged, forming the ”Fédération Internationale du Béton (fib)“. The results of CEB and FIP had been distributed in different ways, such as 'CEB Bulletins d'Information', FIP–Reports, FIP–Notes and CEB–News. These Bulletins or reports comprised various kinds of information, such as State-of-the-Art-Reports, Research Reports, Application Manuals, Guides to Good Practice and the CEB/FIP Model Codes 1978 and 1990. These Model Codes provided design principles and application rules to the structural engineering profession and have been predominantly used for code drafting by many national and international standardizing bodies. The Textbook on Structural Concrete is now intended to provide background information and justification especially for the CEB/FIP Model Code 90 and in some fields of recently extended knowledge. It is addressed to advanced students: this means that basic information on structural analysis and behaviour of structural concrete is a required prerequisite. Practising structural engineers may utilize it for gaining background information on the CEB/FIP Model Code 90 (and national or regional codes as for ex. EUROCODE 2, based on MC 90). The Textbook is also conceived to assist teachers at technical universities or engineering schools to achieve better understanding of the recent theories on structural concrete. Having these targets in mind the General Assembly of CEB decided already in 1995 to set-up a Special Activity Group ”Dissemination of Knowledge“ to realise that work. The authors invited to draft the different chapters had been mostly involved already in drafting the Model Code 90. In this way consistent information could be provided, both for the code and the textbook. Each chapter has been thoroughly discussed and commented within the Special Activity Group 2. This textbook was first presented to fib members during the Technical Activity Workshop in October 1999 in Prague, held in connection with the first fib symposium. The authors are looking forward to receiving comments from various corners.
Investigation of Resistance of Preplaced-aggregate Concrete to Freezing and Thawing by William O. Tynes,James E. McDonald Pdf
The objectives of this investigation were: to establish whether variations in manufacturing procedures may be expected to include some which affect the frost resistance of preplaced-aggregate concrete, to identify such procedures if they exist, to determine if the hardened concrete can be rendered more resistant to freezing and thawing by the addition of an air-entraining admixture (AEA) to the grout mixture, and to make appropriate recommendations for means by which any adverse effects encountered may be avoided in practice. Results indicate that the resistance of conventional preplaced-aggregate concrete at an age of 28 days to accelerated freezing and thawing is much less than that of concrete containing AEA both conventionally mixed and preplaced. Apparently, this relatively low resistance of the preplaced-aggregate concrete containing no added AEA was due chiefly to the low air content, which was contributed to by the relatively small amount of fines in the mixture. The results of tests of the preplaced-aggregate concrete containing AEA for resistance to freezing and thawing were approximately the same as concrete conventionally mixed containing AEA; the addition of AEA increases these values regardless of delay time between mixing and pumping of grout. The air-void spacing-factor values of the preplaced-aggregate hardened-concrete specimens containing similar amounts of entrained air as the conventionally prepared specimens indicated that the concrete would be durable. The durability test data agree with this prediction. (Author).
National Research Council (U.S.). Highway Research Board,National Research Council (U.S.). Highway Research Board. Annual Meeting
Author : National Research Council (U.S.). Highway Research Board,National Research Council (U.S.). Highway Research Board. Annual Meeting Publisher : Unknown Page : 80 pages File Size : 55,9 Mb Release : 1963 Category : Technology & Engineering ISBN : ERDC:35925002181771
Freezing and Thawing of Concrete and Use of Silicones by National Research Council (U.S.). Highway Research Board,National Research Council (U.S.). Highway Research Board. Annual Meeting Pdf
