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This paper presents the design of prototypes, methods of testing and analysis of the strength of concrete beams reinforced with rebar connections. To determine the characteristics of strength, deformation and fracture of experimental beams were tested to complete re-fracture. It is shown that it is possible to restore the strength of reinforced concrete beam by 77-90% by treatment with modern injection materials and technologies.
The paper provides a comparative analysis of three methods used to determine Dm diffusivity, which were tested for non-stationary desorption process and referred to various stages of its course. These are: the √t-type method – linked to the initial phase; the logarithmic procedure – for the advanced phase of the process, and the half-time method – referring to the point of time when 50% of mass has been exchanges. The article presents results of desorption process research carried out in the temperature of 20°C and encompassed three mortars characterized by the following water-cement ratios w/c = 0.50, 0.65 and 0.80. Samples of these mortars were conditioned for several months under air relative humidity φ= 97% until the time of reaching moisture equilibrium, and then they were placed in humidity conditions of φ≈ 0%. The values Dm(√t), Dm(ln), Dm(t0.5), obtained through the analyzed desorption process (T = 20°C, φ= 97% → 0%), presented a good conformity of all the three tested methods in the case of all the mortars – from the fully identical results: Dm(t0,5)/Dm(ln) = 1.00 with w/c = 0.80 to the most diversied ones: Dm(t0,5)/Dm(√t) = 1.23 with w/c = 0.65.
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Many building elements, due to their destination, are exposed to the influence of external environment, often very aggressive. Due to that such building elements should be protected in a special way. I have presented the outline of problems related with maintenance of building structures, taking into account the principles of sustainable building. I have paid extra attention to the characteristics of local environment conditions and to their influence on the response of selected building elements. Building materials should be characterized with such features that will assure that the structures, in which they will be installed, will meet the requirements referring to service features. In this paper requirements regarding structural-material solutions for structures, bases for diagnostic tests and the essence of repair and rehabilitation of building structures has been discussed.
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