Thermal Cracking In Concrete At Early Ages

Author: R. Springenschmid
Publisher: CRC Press
ISBN: 148227129X
Size: 19.32 MB
Format: PDF, ePub
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Restraint and intrinsic stresses in concrete at early ages are vitally important for concrete structures which must remain free of water-permeable cracks, such as water-retaining structures, tunnel linings, locks and dams. The development of hydration heat, stiffness and strength, also the degree of restraint and, especially for high-strength concrete, non-thermal effects, are decisive for sensitivity to cracking. Determining thses stresses in the laboratory and in construction components has led to a clearer understanding of how they develop and how to optimize mix design, temperature and curing conditions. New testing equipment has enabled the effects of all the important parameters to be qualified and more reliable models for predictiong restraint stresses to be developed. Thermal Cracking in Conrete at Early Ages contains 56 contributions by leading international specialists presented at the RILEM Symposium held in October 1994 at the Technical University of Munich. It will be valuable for construction and site engineers, concrete technologists and scientists.

Prevention Of Thermal Cracking In Concrete At Early Ages

Author: R. Springenschmid
Publisher: CRC Press
ISBN: 1482271818
Size: 77.37 MB
Format: PDF, Kindle
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An important new report from the RILEM Technical Committee 119. This book presents models and methods to determine thermal stresses and cracking risks in concrete. The possible influences on and causes of thermal cracking of concrete are discussed and cases of practical measures for avoiding cracking are detailed.

Identifying Incompatible Combinations Of Concrete Materials

Author:
Publisher:
ISBN:
Size: 21.73 MB
Format: PDF, ePub, Mobi
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Unexpected interactions between otherwise acceptable ingredients in Portland cement concrete are becoming increasingly common as cementitious systems become more and more complex and demands on the systems are more rigorous. Such incompatibilities are exhibited as early stiffening or excessive retardation, potential for uncontrolled early-age cracking, and unstable or unacceptable air-void systems. A number of test methods have been reviewed to assess their usefulness in detecting incompatibility early to help prevent problems with pavements in the field. A protocol has been developed to allow product manufacturers, concrete producers, contractors, and owners to monitor their materials and concrete systems. The protocol is phased to allow relatively simple field tests to provide early warnings of potential problems and then central laboratory tests to support and confirm the field work.

High Strength Concrete

Author: Atorod Azizinamini
Publisher: Amer Society of Civil Engineers
ISBN:
Size: 26.23 MB
Format: PDF
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Fifty-one papers from the July 1997 conference reflect recent research activities to resolve design issues related to the performance of high strength concrete (HSC) and the replacement of severe code limitations with more relaxed provisions. The section headings are design, columns, shear, prestres