Non-invasive tests of precast cantilever balcony in OWT-67 system

Piotr Bieranowski,Piotr Knyziak,V Andreev,T Matseevich,A Ter-Martirosyan,A Adamtsevich

doi:10.1051/matecconf/201819602023

Piotr Bieranowski, Piotr Knyziak + Show 4 more

Open Access

https://doi.org/10.1051/matecconf/201819602023

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Abstract

This article presents a non-invasive tests report of precast cantilever balcony support in OWT-67 large-panel system. During field testing, the balcony's reinforced concrete structure was subjected to radiometric analysis in the context of thermal energy distribution as well as from the point of view of mycology - to the possible presence of spores of domestic fungi. The temperature distribution tests carried out by means of the electromagnetic wave detection in the infrared spectrum clearly confirmed the significant losses of thermal energy caused by the effect of the thermal constructional bridge located in the balcony. Mycological diagnosis was carried out using the rapid test of the Mycometer bacterial meter, which allows fluorimetric evaluation of the presence of the enzyme presence in filamentous fungi. In the conducted study, no spores of the house mushroom were found on the inside surface of the Z-type balcony supporting beam as a place where condensation of water vapor may occur. The summary also presents a design solution that allows to eliminate this physical problem.

Highlights

Large-panel construction in Poland was designed and implemented at the turn of the 1970s and 1980s [1]
The diagnostic test was performed with a thermal wave detector with a thermal sensitivity of 50 mK and a measurement accuracy of ± 2%
The results of in-situ thermovision tests - a linear thermal bridge, which is located in the structural system of the balcony of the large-panel system OWT-67, are shown below (Figures 6, 8 and 10)

Summary

Introduction

Large-panel construction in Poland was designed and implemented at the turn of the 1970s and 1980s [1]. In those years the largest among the various technologies of erecting residential buildings was the construction of large-panel buildings. In 1980, it reached the extreme value of 79 % share of all construction types. The most widespread system among the large-panel systems was OWT-67 - Figure 1. It represented 27.9 % of all erected systems (in all its variants). One of the most problematic structural elements of these buildings were the cantilever balconies (Figure 2)

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Conclusion