INFLUENCE OF LASER RADIATION ON HEAVY CONCRETE

Abstract

The results of studies of samples of cubes of heavy concrete on the effects of laser radiation are presented. The temperature distribution in the samples, the zones of influence and surface destruction, the possibility of processing concrete are shown, one of the approaches to determining the stress-strain state of the heating section is described.

In the process of experimental studies, the appearance of “cold plasma” on the surface of the  contact spot of ray and concrete was recorded. This phenomenon was recorded when testing cubes made of water-saturated concrete of all strength classes. When testing dry samples and at natural humidity, the plasma is not fixed. Moreover, in all samples, the formation of a layer of vitreous material up to 1 mm thick, separated from a concrete cube by a layer of a porous material such as cellular concrete, also about 1 mm thick, was recorded.

Vapors in this layer of free water  from concrete and compounds, which are formed during the high-temperature destruction of cement stone, create an insulating layer. This layer does not allow the temperature to penetrate deep into concrete and creates opportunities for treating the surface of concrete (cleaning, etc.). Based on the results of the research, conclusions are drawn about the possibility of using a laser to treat the surface of concrete. Recommendations are also provided to reduce the effects of laser radiation on heavy concrete when operating protective structures.