The distribution of fiber orientation is an important factor in determining the mechanical properties of fiber-reinforced concrete. This study proposes a new image analysis technique for improving the evaluation accuracy of fiber orientation distribution in the sectional image of fibers reinforced concrete. The article is devoted to research the systematic evaluation of fiber-cuts through the image processing software. Mathematical representation of the final dispersal of fibers in steel fiber-reinforced concrete is incorporated into a programmed evaluation software. The software detects fibers and classified according to their axes of rotation angle and size of the identified ellipse detection area. Image processing algorithm and detecting fibers has been developed only for these research purposes. Detection area is randomly inserted via steel fiber reinforced concrete structure. The results show the average value of uniformity in the fiber-samples produced in the laboratory.
Fibre concrete requirements are only met if the fibres in its volume are evenly distributed. Their direction and orientation should be equal around each axis in a three-dimensional space. The requirement is that the fibres to be evaluated in the final hardened fibre concrete are cut from fibre concrete sections. Homogeneity can also be verified on fibre-concrete cross-sections. Fibre Position Evaluation is a mathematical task that is not presented here but is currently made up of the results of this experiment. In the first step, it was necessary to prepare samples to obtain the necessary cross-sections. In the next step, it was necessary to create conditions by creating a contrast between the fibres and the concrete to create software capable of detecting fibres. In this paper, the principle of detection of fibres based on the detection of cut section images is described. There are several methods used to highlight the concrete matrix over the fibres. Also presented are the results of adding and detecting fibres.
Trh v stavebníctve je v aktuálnom období tak nestabilný, že si jeho vývoj už nedokáže nikto ani len odhadnúť. Nárast cien stavebných materiálov v aktuálnych hodnotách bol absolútne neočakávanou udalosťou. Okrem materiálov rástli aj ceny práce, pohonných hmôt, réžií a iných zložiek kalkulačného vzorca. Index vývoja cien sa stal nepredvídateľnou udalosťou, ktorá zásadne ovplyvňuje stavebný trh. Zhotovitelia aj investori sa stali obozretnejší a opatrnejší. Súčasťou zmlúv sa stávajú indexačné doložky. Kompetentné organizácie zareagovali s odstupom času a vydali metodické pokyny pre verejný sektor. Vydané metodiky v určitej miere reflektujú na trh, ale nie sú nepokryjú celkové navýšenie a ani infláciu. Spôsoby stanovenia zmeny ceny boli predmetom skorších autorov, ktorí sa tejto problematike venovali. Jednou z nich je aj použitie smerných orientačných nástrojov vydávaných v dostupných databázach. Článok približuje predvídateľnosť cien, spôsoby stanovenia nárastu ceny stavby a hodnotí v súčasnosti platnú metodiku pre verejný sektor.
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