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This paper presents the results of a study on the compressive strength, weight loss, surface roughness, elemental analysis and ultrasonic pulse velocity (UPV) measurement after 270 days of seasoning concrete cubes measuring 100 × 100 × 100 mm in solutions of sewage from the post‐grit chamber as well as sewage from the activated sludge chamber in three different environments, that is, acidic, neutral,...
W pracy omówiono zagadnienia związane z trwałością fundamentów słupów linii elektroenergetycznych najwyższych napięć (NN) oraz przedstawiono sposoby ich renowacji. W części badawczej przeprowadzono diagnostykę wybranych fundamentów słupów linii NN (400 kV) Wielopole–Noszowice. W trakcie wizji lokalnej ustalono, że istnieją odpryski i niewielkie ubytki powierzchniowe betonu, a w niektórych przypadkach...
This paper aims to present the results of compressive strength tests of concrete specimens, prepared according to two recipes, after 2, 7 and 28 days of maturing in four different environments. The concrete specimens had the same w/c ratio, the same amount of aggregate of particular fractions, the addition of a superplasticizer, but they differed in the cement type. In one recipe, the Portland cement...
The Rayleigh’s method can be used to determine the first natural frequency of beams with variable cross-section. The authors analyse multi-segment simply supported beams, symmetrical with respect to their midpoint, having a constant width and variable height. The beams consist generally of five segments. It has been assumed that the neutral bar axis deflected during vibrations has a shape of a beam...
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