CONCRETE

[:ru]Соловьянчик А. Р.[:en]Solovianchik, A. R.[:] [:ru]д-р техн. наук, проф., гл. науч. сотрудник, ОАО ЦНИИС, Москва, Россия[:en]Dr. Eng. Sc., Prof., Head Researcher, CNIIS JSC, Moscow, Russia[:]

Alitinform №3-4 (04-05) 2008 г. 107-112 p.

Abstract

Nowadays in regulating documents and in project documentation for construction of bridges, elevated roads, overhead bridges, tunnels and other objects, the aspects not properly considered are those that regard to influence of temperature factor on forming application properties of concrete and constructions being built, and, first of all, their quality, service life and production costs. According to the experience of many artificial constructions’ building, it is known that not-sufficient consideration of temperature factor in objects designing and work execution projects development leads to multiple defects and cracks appearing, eliminating of which requires substantial means and a lot of time.

The experience of construction at many sites shows that while working on the means to prevent crack-forming due to temperature stresses in a construction it is necessary to take into consideration both temperature micro-stresses in a material and macro-stresses in the construction.

Temperature micro-stresses mean stresses which appear in concrete due to difference between values of linear expansion factor and modulus of elasticity for

coarse filler and cement mortar (micro-stresses of the first kind);

fine filler and cement stone (micro-stresses of the second kind);

separate crystals of cement stone (micro-stresses of the third kind).