Detail publikace

Ultrasound Measurements for the Detection of Disintegration of Concrete Slabs Exposed to Fire

NOVÁKOVÁ, I. MACHÁNOVÁ, P.

Originální název

Ultrasound Measurements for the Detection of Disintegration of Concrete Slabs Exposed to Fire

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

The paper presents the application of ultrasound measurements for the determination of structural alterations of concrete exposed to fire. Concrete is evaluated as an incombustible material, class A1, but the high exposure temperature, like in fire, may cause cracks and changes of internal structure. The ultrasound measurement is a nondestructive method. It is possible to measure ultrasound velocity before and after thermal loading. The ultrasound measurement could be used also at building side as to detect structural alterations after a fire or imperfection in concrete elements. Three different concrete mixtures were prepared and tested in this study. The basalt aggregate were used in the reference mixture and in a mixture with addition of polypropylene fibers (PP-fibers). The third concrete was made with light weight aggregates (LWA). The test slabs (dimension 10 x 30 x 1150 mm) were poured and cured in laboratory ambient (22C and 40% RH) for 3 months. Then the slabs were exposed to fire, according to standard temperature-time curve ISO 834. The ultrasound velocity was determined on crossline screen of 10 points before and after heating of the concrete slabs. The results of ultrasound measurements indicate the changes of internal concrete structure. The cracks are formed by pressure of evaporating unbounded water and thermal extensibility of single components.

Klíčová slova

Ultrasound velocity, high temperatures, ISO 834, thermal treatment, failure of internal structure, explosive spalling, Basalt, light weight aggregates concrete

Autoři

NOVÁKOVÁ, I.; MACHÁNOVÁ, P.

Rok RIV

2014

Vydáno

8. 12. 2014

Nakladatel

Trans Tech Publications

ISBN

978-3-03835-452-9

Kniha

Advanced Materials Research

Číslo edice

Vol. 1100

ISSN

1022-6680

Periodikum

Advanced Materials Research

Ročník

1100

Stát

Švýcarská konfederace

Strany od

124

Strany do

127

Strany počet

4

BibTex

@inproceedings{BUT112303,
  author="Iveta {Nováková} and Petra {Pupíková}",
  title="Ultrasound Measurements for the Detection of Disintegration of Concrete Slabs Exposed to Fire",
  booktitle="Advanced Materials Research",
  year="2014",
  journal="Advanced Materials Research",
  volume="1100",
  number="Vol. 1100",
  pages="124--127",
  publisher="Trans Tech Publications",
  doi="10.4028/ISBN978-3-03835-452-9",
  isbn="978-3-03835-452-9",
  issn="1022-6680"
}