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

conference paper

English

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.

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

NOVÁKOVÁ, I.; MACHÁNOVÁ, P.

2014

8. 12. 2014

Trans Tech Publications

978-3-03835-452-9

Advanced Materials Research

Vol. 1100

1022-6680

Advanced Materials Research

1100

Swiss Confederation

124

127

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