Effects of different fibre materials and quantities on high temperature strength and explosive spalling of UHPC concrete

Title: Effects of different fibre materials and quantities on high temperature strength and explosive spalling of UHPC concrete
Author(s): M. Saravanja, W. Klingsch, S. Anders
Paper category : conference
Book title: 2nd International RILEM Workshop on Concrete Spalling due to Fire Exposure
Editor(s): E.A.B. Koenders and F. Dehn
ISBN: 978-2-35158-118-6
e-ISBN: 978-2-35158-119-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 271 - 279
Total Pages: 9
Nb references: 8
Language: English

Abstract: For the investigation of the fire resistance of Ultra High Performance Concrete, cylinders with D/H=50/100 mm were concreted. The concretes were modified using fibre cocktails consisting of steel fibres and several dosages and types of polypropylene (PP) and polyethylene (PE) fibres with differences in the melting point and melting flow index.

The tests parameters were:
- Type and dosage of PP-fibres: The dosage ranged between 1 kg/m³ and 20 kg/m³, the types of fibres differed in melting point and melting behaviour.
- Cements with different fineness (blaine value) were tested.
- Moisture content was varied by storing the specimens in water or air respectively prior to testing.
- Heating rate ranged between 2 K/min and 5 K/min.

The temperature distribution and expansion of the samples during the tests were measured. Among another results, the tests showed, that an increase in moisture content of 1% demands a doubled pp-fibre content to protect the concrete specimens from explosive spalling. In the full paper the test results will be presented and discussed in detail, especially concerning spalling and the subsequent safety of UHPC-structures subjected to combined static-loading and high temperature exposure.

Online publication: 2012-01-17
Publication type : full_text
Public price (Euros): 0.00