[PDF] Some Factors Relating To The Control Of Thermal Stresses In Mass Concrete Construction eBook

Author : Zhu Bofang
Publisher : Butterworth-Heinemann
Page : 525 pages
File Size : 40,13 MB
Release : 2013-12-11
Category : Technology & Engineering
ISBN : 0124078540

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Methods of controlling mass concrete temperatures range from relatively simple to complex and from inexpensive too costly. Depending on a particular situation, it may be advantageous to use one or more methods over others. Based on the author’s 50 years of personal experience in designing mass concrete structures, Thermal Stresses and Temperature Control of Mass Concrete provides a clear and rigorous guide to selecting the right techniques to meet project-specific and financial needs. New techniques such as long time superficial thermal insulation, comprehensive temperature control, and MgO self-expansive concrete are introduced. Methods for calculating the temperature field and thermal stresses in dams, docks, tunnels, and concrete blocks and beams on elastic foundations Thermal stress computations that take into account the influences of all factors and simulate the process of construction Analytical methods for determining thermal and mechanical properties of concrete Formulas for determining water temperature in reservoirs and temperature loading of arched dams New numerical monitoring methods for mass and semi-mature aged concrete

Author : R. Springenschmid
Publisher : CRC Press
Page : 365 pages
File Size : 19,87 MB
Release : 2004-06-02
Category : Architecture
ISBN : 1482271818

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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.

Author : R. Springenschmid
Publisher : CRC Press
Page : 500 pages
File Size : 49,45 MB
Release : 1994-10-13
Category : Architecture
ISBN : 9780419187103

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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.

Author : Charles L. Townsend
Publisher :
Page : 0 pages
File Size : 14,17 MB
Release : 1964
Category : Concrete
ISBN :

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Cracking occurs in mass concrete when tensile stresses exceed the tensile strength of the concrete. Most of these stresses are caused by restraint against volume change; others occur because of loading conditions and the configuration of the structure. To estimate future tensile stresses, temperature studies must be made to determine the temperature changes which will occur in a structure from the time concrete is first placed in the structure until the structure is in normal operation. These temperature changes are made a part of the design and construction of the structure. The range or amplitude of mean concrete temperature in a mass concrete structure is of primary interest, but temperature gradients are also investigated. The heat of hydration of the cement, the concrete mix proportions, the diffusivity of the concrete, amplitudes of air and reservoir temperatures, and solar radiation affect the concrete temperatures. Knowing the concrete temperatures and temperature changes to be encountered, the width and length of the construction block is determined, the precooling and/or artificial cooling measures are selected, and construction requirements are determined. Included in the latter are surface treatments, operation of cooling systems, height differentials, and foundation irregularities. (Author).

Author : J. Paul Guyer, P.E., R.A.
Publisher : Guyer Partners
Page : 29 pages
File Size : 50,40 MB
Release : 2018-09-18
Category : Technology & Engineering
ISBN :

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Introductory technical guidance for civil engineers and construction managers interested in design and construction of massive concrete structures, such as dams, to mitigate cracking caused by temperature change.

Author : P. B. Bamforth
Publisher :
Page : 116 pages
File Size : 24,65 MB
Release : 2007
Category : Science
ISBN :

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This guide provides a method for estimating the magnitude of crack inducing strain and the risk of cracking; and where cracking will occur guidance is provided on the design of reinforcement to control crack widths.