Temperature Changes and Thermal Cracking in Concrete Pavements at Early Statees [by] J.G. Hunt PDF Download
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Author: J. G. Hunt
Publisher:
ISBN: 9780721008226
Category : Pavements, Concrete
Languages : en
Pages : 24
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![Temperature Changes and Thermal Cracking in Concrete Pavements at Early Statees [by] J.G. Hunt PDF](https://books.google.com/books/content/images/frontcover/rWsOHAAACAAJ?fife=w80-h100)
Author: J. G. Hunt
Publisher:
ISBN: 9780721008226
Category : Pavements, Concrete
Languages : en
Pages : 24
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Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 888
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Author: J. G. Hunt (engineer.)
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 20
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Author: Per Just Andersen
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 118
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Book Description
This report describes the use of tables developed to help determine problems that may result from early thermal effects in concrete. The thermal behavior of concrete can be estimated from a knowledge of concrete temperature, air temperature, type of cement, and content of cement in the mixture. The thermal effects tables can be used to predict whether too high a temperature will be reached in the pavement; whether early thermal cracking will result from larger differences between the temperature of the concrete slab and the temperature of either the air or the base; or whether there is a risk of early cracking of the concrete. Examples of the use of the table are given along with guidelines for avoiding undesirable thermal effects.
Author: J.G. Hunt
Publisher:
ISBN: 9780721008257
Category :
Languages : en
Pages : 20
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Author:
Publisher:
ISBN:
Category : Construction industry
Languages : en
Pages : 686
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Author: ZHENYU SHE
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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Book Description
This study investigates experimentally and numerically the addition of microencapsulated phase change materials (PCMs) into concrete pavements at early ages to limit (i) temperature rise caused by cement-water hydration, (ii) cooldown rate, and (iii) the associated risk of thermal cracking. First, the effect of water-reducing admixture (WRA) on the heat generation rate from cement hydration was quantified using isothermal calorimetry. Second, large cubic PCM-mortar composite specimens representative of a common pavement geometry were prepared and placed in an environmental test chamber simulating realistic diurnal conditions. The results showed that the presence of PCM can reduce considerably the temperature rise and cooldown rate across the cementitious composite section within the first 24 hours following placement provided the PCM melting temperature is selected carefully. This was in spite of the fact that the lower thermal conductivity of PCM-composites inhibited heat dissipation. A transient 1D thermal model of pavement section was developed to simulate the temperature evolution and the rate of change in temperature within PCM-mortar composite sections. Good agreement was found between model predictions and experimental measurements. In addition, a parametric study was carried out to assess the effects of the PCM melting characteristics (temperature, temperature window, latent heat) on local temperature in PCM-mortar composites. The constitutive relationships and the numerical model developed as part of this study can be used to inform the design of concrete pavements containing PCMs for early-age crack resistance.
Author: R. Springenschmid
Publisher: CRC Press
ISBN: 9780419187103
Category : Architecture
Languages : en
Pages : 960
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Book Description
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: John Gratland Hunt
Publisher:
ISBN:
Category :
Languages : en
Pages : 786
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Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 276
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