Properties of Czech WW2 Concrete Fortifications after 80 Years

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00343624" target="_blank" >RIV/68407700:21110/20:00343624 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.23967/dbmc.2020.115" target="_blank" >https://doi.org/10.23967/dbmc.2020.115</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.23967/dbmc.2020.115" target="_blank" >10.23967/dbmc.2020.115</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Properties of Czech WW2 Concrete Fortifications after 80 Years

Popis výsledku v původním jazyce

This paper deals with the investigation of properties of Czech fortification concrete bunkers built before Second World War (WWII). The Czech defense system consisted mainly of light bunkerstype No. 37. The vast numbers of these bunkers have been preserved in various conditions to nowadays. The light bunkers type No. 37 were designed to last limited lifetime of decades. According to the preserved test protocols, strength of used concrete varied from 40 to 50 MPa, measured on cube specimens with dimensions 200x200x200 mm. There is an information, in general public, about high quality and strength of used concrete. The non-destructive analysis of compressive strength, determined by Schmidt hammer was performed. This method was used to maintain a historical value of thestructures. Three were analyzed different bunkers type No. 37 located in Western Bohemia – Pilsner region. Tested bunkers are preserved in various conditions with various quality of concrete. The measurements by Schmidt hammer took place in several locations especially in the interior part. The exterior was also investigated but only in the locations of surface which were not covered with camouflage plaster. Non-destructive testing had shown high quality of concrete older than 80 years old concrete, with compressive strength between 50 to 60 MPa. On the other hand, based on the visual assessment, the concrete showed very different characteristics, especially in compactness and the quality of surface layer. We can find places with insufficiently compacted concrete with exposed steel reinforcement.

Název v anglickém jazyce

Properties of Czech WW2 Concrete Fortifications after 80 Years

Popis výsledku anglicky

This paper deals with the investigation of properties of Czech fortification concrete bunkers built before Second World War (WWII). The Czech defense system consisted mainly of light bunkerstype No. 37. The vast numbers of these bunkers have been preserved in various conditions to nowadays. The light bunkers type No. 37 were designed to last limited lifetime of decades. According to the preserved test protocols, strength of used concrete varied from 40 to 50 MPa, measured on cube specimens with dimensions 200x200x200 mm. There is an information, in general public, about high quality and strength of used concrete. The non-destructive analysis of compressive strength, determined by Schmidt hammer was performed. This method was used to maintain a historical value of thestructures. Three were analyzed different bunkers type No. 37 located in Western Bohemia – Pilsner region. Tested bunkers are preserved in various conditions with various quality of concrete. The measurements by Schmidt hammer took place in several locations especially in the interior part. The exterior was also investigated but only in the locations of surface which were not covered with camouflage plaster. Non-destructive testing had shown high quality of concrete older than 80 years old concrete, with compressive strength between 50 to 60 MPa. On the other hand, based on the visual assessment, the concrete showed very different characteristics, especially in compactness and the quality of surface layer. We can find places with insufficiently compacted concrete with exposed steel reinforcement.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/DG18P02OVV063" target="_blank" >DG18P02OVV063: Vývoj progresivního sanačního postupu pro restaurování a konzervaci vojenských pevnostních objektů z 30. let 20. století</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Current Topics and Trends on Durability of Building Materials and Components

ISBN

978-84-121101-8-0

ISSN

—

e-ISSN

—

Počet stran výsledku

6

Strana od-do

1197-1202

Název nakladatele

International Center for NumericalMethods in Engineering

Místo vydání

—

Místo konání akce

Barcelona

Datum konání akce

20. 10. 2020

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—