|Series||GAO/RCED -- 84-87|
|The Physical Object|
|Pagination||10 p. ;|
|Number of Pages||10|
The Significance of Thermal Stress in Mass Concrete. The Features of Thermal Stresses in Concrete Structures. The Variation of Temperature and Thermal Stress of Mass Concrete with Time. Kinds of Thermal Stress. Analysis of Thermal Stress of a Massive Concrete Structure. Thermal Stress—The Cause of Crack. and provides general guidance on mass concrete speci-fications and thermal control measures. The reader will learn how to minimize the likelihood of cracking and improve the durability of mass concrete by optimizing the mix design, as well as predicting, monitoring, and controlling concrete temperatures. Professional Development Series Sponsor. This paper describes analyses of mass concrete structures (MCSs) performed using concrete properties obtained by thermal stress devices, with the . predicting thermal stress. However, there is still large discrepancy between the thermal stresses in real structures and the results by simulations. In this paper, several devices and methods related to the hydration heat and thermal stress in concrete are suggested for more accurate prediction of thermal stresses. Size: KB.
CRACKING in mass concrete structures is undesir- able as it affects the water-tightness, durability, appearance, and internal stresses of t,he structures. Cracking in mass concrete will normally occur when tensile stresses are developed which exceed the tensile strength of the concrete. These tensile. Thermal analysis of mass concrete structures by United States. General Accounting Office, , U.S. General Accounting Office edition, in EnglishPages: Temperature plays a significant part in the cracking phenomenon of mass concrete structures, and therefore thermal analysis is of major importance, especially during . Mass concrete is defined by the American Concrete Institute as: “any volume of concrete in which a combination of dimensions of the member being cast, the boundary conditions, the characteristics of the concrete mixture, and the ambient conditions can lead to undesirable thermal stresses, cracking, deleterious chemical reactions, or reduction in the long-term .
The main factor that defines a mass concrete member is its minimum dimension. ACI suggests that a concrete mem-ber with a minimum dimension of 4 feet ( m) should be considered as mass concrete. Some specifications use a vol-ume-to-surface ratio. Other factors where precautions for mass concrete should be taken even for thinner sections areFile Size: KB. A numerical procedure based on the finite-element method for the stress-strain analysis of concrete structures exposed to time- and space-variable thermal loads is presented in this paper. Different environmental conditions can be simulated by means of suitable boundary conditions imposed on the differential equations governing the phenomenon. Thermal mass is a concept in building design that describes how the mass of the building provides inertia against internal temperature fluctuations. This is typically achieved through its ability to absorb unwanted heat during the day and then release it at night with the help of ventilation from cool night air. Thermal mass is the ability of a material to absorb and store heat energy. A lot of heat energy is required to change the temperature of high density materials like concrete, bricks and tiles. They are therefore said to have high thermal mass. Lightweight materials such as timber have low thermal mass. Appropriate use of thermal mass throughout.