STRESSES IN CEMENT-CONCRETE PAVEMENT SURFACING CAUSED BY THERMAL SHOCK
https://doi.org/10.21122/2227-1031-2016-15-2-87-94
Abstract
It is necessary to mention specially so-called thermal shock among various impacts on highway surface. Ice layer is formed on a concrete surface during the winter period of pavement surfacing operation. Sodium chloride which lowers temperature of water-ice transition temperature and causes ice thawing at negative temperature is usually used to remove ice from the pavement surface. Consequently, temperature in the concrete laying immediately under a thawing ice layer is coming down with a run that leads to significant stresses. Such phenomenon is known as a thermal shock with a meaning of local significant change in temperature. This process is under investigation, it has practical importance for an estimation of strength and longevity of a cement-concrete pavement surfacing and consequently it is considered as rather topical issue. The purpose of investigations is to develop a mathematical model and determination of shock blow permissible gradients for a cementconcrete road covering. Finite difference method has been used in order to determine stressed and deformed condition of the cement-concrete pavement surfacing of highways. A computer program has been compiled and it permits to carry out calculation of a road covering at various laws of temperature distribution in its depth. Regularities in distribution of deformation and stresses in the cement-concrete pavement surfacing of highways at thermal shock have been obtained in the paper. A permissible parameter of temperature distribution in pavement surfacing thickness has been determined in the paper. A strength criterion based on the process of micro-crack formation and development in concrete has been used for making calculations. It has been established that the thermal shock causes significant temperature gradients on the cement-concrete surfacing that lead to rather large normal stresses in the concrete surface layer. The possibility of micro-crack formation in a road covering is determined with the help of such characteristics as material strength, conditions of plate anchoring and a temperature gradient.
About the Authors
M. K. Pshembaev
Belarusion National Technical University
Belarus
Doctor of Engineering
Belarus
Doctor of Engineering
J. N. Kovalev
Belarusion National Technical University
Belarus
Belarus
Professor, PhD in Engineering
L. I. Shevchuk
Belarusion National Technical University
Belarus
Belarus
Associate Professor, PhD in Engineering.
Address for correspondence: Shevchuk Leonid I. - Belаrusian National Technical University, 150 Nezavisimosty Ave., 220013, Minsk, Republic of Belarus Tel.: +375 17 265-97-28 ftk75@bntu.by
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Review
For citations:
Pshembaev M.K., Kovalev J.N., Shevchuk L.I. STRESSES IN CEMENT-CONCRETE PAVEMENT SURFACING CAUSED BY THERMAL SHOCK. Science & Technique. 2016;15(2):87-94. (In Russ.) https://doi.org/10.21122/2227-1031-2016-15-2-87-94
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