Introduction. The article examines the testing method of monolithic slabs of bridges deck with permanent reinforced concrete formwork [1] using the method of optical-digital speckle-correlation of images [2].
Problem statement. A promising direction in cast-in-situ bridge construction is using of various types of permanent formwork during slab concreting. However, using of such formworks has not been studied much till today. Therefore, it is advisable to conduct a test of full-scale models of slabs. In domestic practice, mechanical devices, strain gauges, optical microscopes, etc. are used during laboratory studies and field tests of building structures to measure relative deformations and movements, as well as to visually observe the formation and development of cracks. All these devices require constant checking and maintenance and it is not always possible to do this. However, for the needs of laboratory tests with the method of optical-digital speckle correlation of images, a digital image of the object at different load levels is mostly sufficient. It is only necessary to choose the right optics according to the experimental area and ensure sufficient lighting.
Purpose. The purpose of the work was in experimentally determining of the expediency of using the optical-digital speckle-correlation method of images in the models testing.
Metods of study. According to the results of exploratory researches, it is proposed to apply the method of optical-digital speckle correlation of images.
Results. The expediency of using the method of optical-digital speckle-correlation of images in the investigation of bridges deck models has been established.
Conclusions. Using the method of optical-digital speckle-correlation of images makes possible to investigate the change of relative deformations and the movement of individual points or areas during the study of concrete surfaces. This, in turn, allows to investigate the places and nature of the formation of cracks and enables practical use - during the examination of existing structures, it is possible to record the places of future cracks and the relative deformations of individual areas.
