NDLI: Thermal analysis at the evaluation of concrete damage by high temperatures

Content Provider	Springer Nature Link
Author	Jatka, I. Mojumdar, S. C.
Copyright Year	2005
Abstract	Concrete damage by high temperatures includes mass loss, strength and modulus reductions and the formation of cracks and large pores. Thermal treatment reduces the amount of chemically bound water in the hydrate phase. With a rise in temperature, the spatial distribution of Ca(OH)$_{2}$ crystals becomes more compact; smaller crystals occur in a unit volume of the cement paste. A rise in temperature affects the pore structure by reducing the specific surface of hydration products. Cement paste becomes more heterogeneous in microstructure and coarser in pore structure. Compressive strength is not only significant parameter showing structural integrity of concrete; permeability influences concrete durability as well. To demonstrate this, permeability coefficients at various high temperatures are presented. The key quantitative insight into the hydrate phase behavior is based on thermal analysis results. Thermogravimetric (TG) mass losses are related to the phase changes represented either by DTA or DTG. Based on these, the tests employing TG mass losses and related DTA and DTG curves answer the question if the hydrate phase is present at individual high-temperature levels and what its quantitative state is. Method of thermal analysis is suitable for the interpretation of concrete behavior when subjected to high-temperature attack. Conclusions are drawn about thermal stability and residual properties of concrete specimens made at the construction site of Mochovce nuclear power plant (Slovakia); and subjected to temperatures up to 800°C. Relations among mechanical properties, permeability, pore median radius and bound water content in concrete are discussed and evaluated.
Starting Page	197
Ending Page	203
Page Count	7
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	81
Issue Number	1
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Physical Chemistry Polymer Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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