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Based on the proceedings of the Fourth International Union of Testing and Research Laboratories in Materials and Structures (RILEM) Symposium held at Northwestern University, August 1986. Contributions reflect the state of the art and address the major concerns related to long-term serviceability of concrete construction.
International Union of Testing and Research Laboratories for Materials and Structures
Author : International Union of Testing and Research Laboratories for Materials and Structures Publisher : Page : pages File Size : 50,39 MB Release : Category : ISBN :
CREEP, SHRINKAGE AND DURABILITY MECHANICS OF CONCRETE AND CONCRETE STRUCTURES contains the keynote lectures, technical reports and contributed papers presented at the Eighth International Conference on Creep, Shrinkage and Durability of Concrete and Concrete Structures (CONCREEP8, Ise-shima, Japan, 30 September - 2 October 2008). The topics covered
The creep and shrinkage of concrete are complex phenomena which are not yet fully understood and there is a pressing need to solve the fundamental problems of creep and shrinkage and to develop adequate methods of predicting the structural performance of concrete members and structures affected by them. The aim of this book is to discuss the results of experimental research, to summarize various approaches to the prediction of creep and shrinkage, and to present suitable methods of structural creep analysis which allow the creep and shrinkage effects to be simply calculated. Particular attention is paid to methods which are intended for use as design tools. The first chapter deals with the fundamental features of creep and shrinkage of concrete according to the results of experimental research, while the second is devoted to the mathematical modeling of creep and shrinkage of concrete and to the practical prediction of these phenomena. Several practical models for predicting mean cross section creep and shrinkage are also presented.
This comprehensive treatise covers in detail practical methods of analysis as well as advanced mathematical models for structures highly sensitive to creep and shrinkage. Effective computational algorithms for century-long creep effects in structures, moisture diffusion and high temperature effects are presented. The main design codes and recommendations (including RILEM B3 and B4) are critically compared. Statistical uncertainty of century-long predictions is analyzed and its reduction by extrapolation is discussed, with emphasis on updating based on short-time tests and on long-term measurements on existing structures. Testing methods and the statistics of large randomly collected databases are critically appraised and improvements of predictions of multi-decade relaxation of prestressing steel, cyclic creep in bridges, cracking damage, etc., are demonstrated. Important research directions, such as nanomechanical and probabilistic modeling, are identified, and the need for separating the long-lasting autogenous shrinkage of modern concretes from the creep and drying shrinkage data and introducing it into practical prediction models is emphasized. All the results are derived mathematically and justified as much as possible by extensive test data. The theoretical background in linear viscoelasticity with aging is covered in detail. The didactic style makes the book suitable as a textbook. Everything is properly explained, step by step, with a wealth of application examples as well as simple illustrations of the basic phenomena which could alternate as homeworks or exams. The book is of interest to practicing engineers, researchers, educators and graduate students.