Effect of normalizing heat treatment on the mechanical behaviour of low-alloy steel weld metals

Title: Effect of normalizing heat treatment on the mechanical behaviour of low-alloy steel weld metals
Author(s): V. B. Trindade, J. C. Payão-Filho, A. S. Guimarães, R. P. R. Paranhos
Paper category : journal
Serial title: Materials and Structures
Abreviated Serial title: Mater. Struct.
ISSN: 1359-5997
Publisher: RILEM Publications SARL
Volume: 38
Issue: 277
Issue date: 2005-04-01
Publication year: 2005
Pages: 353 - 357
Total Pages: 5
Nb references: 7
Language: English

Abstract: The incorporation of steel fibres can compensate the inherently brittle behaviour of high strength concrete.
This paper studies the residual mechanical behaviour of thermally damaged high strength steel Fibre Reinforced Concrete (FRC).
The type and content of fibres were included as variables, a mortar and a normal strength fibre concrete were also tested.
Two exposure conditions were selected, 1 hour at 500°C and 24 hours at 150°C.
FRC follow similar residual compressive behaviour as the plain concrete, but the presence of fibres lead to slight increase in strength and in the stress at which cracks initiate.
Flexural tests on notched beams were performed (RILEM TC-162 recommendation).
It was found that the shape of the load-deflection curves in FRC exposed to 150°C was similar to the undamaged concrete.
The reductions in flexural strength were lower in FRC than in plain concrete, and the equivalent post-peak strength were less affected than first-crack strength, showing the effect of fibre reinforcement.
For the most severe exposure condition the degradation of the material is reflected by an increased non-linearity, nevertheless some FRC still exhibited a strengthening type behaviour and kept an almost constant load capacity during the post-peak.

Online publication: 2005-01-21
Classification: Scientific Reports
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/14177