-
Click to view details.... Click to view details.. Click to view details.... Click to view details.... TERApro- the professional software
 
image
image
Fire Strength Performance of High Strength Concrete Structural Members
image
Introduction What is "Spalling"? Mechanisms of Spalling
Why Spalling is a problem in HSC & not in Normal Strength Concrete (NSC) Factors affecting fire performance & ways to improve fire performance of High Strength Concrete Structural members
image
Article based on contribution by: Mr Saransh Kataria & Mr Satyajeet Harne , Civil engineering Students, S.G.S.I.T.S, Indore

Introduction

A fire in the English Channel tunnel in 1996,  caused severe damage to tunnel rings owing to the spalling of concrete and resulted in injuries to eight people and a property loss of £50 million. The spalling was attributed to the High Strength of the concrete.

Starting in the 1980s concretes with increasing compressive strengths started to become commercially available and primarily utilized in the construction of high-rise buildings. High-strength concrete (HSC) provides a high level of structural performance, especially in strength and durability, compared to traditional, normal-strength concrete (NSC). 
.

Use of HSC offered economic advantages because concrete column size could be reduced, thus permitting more usable space. It also had application in the construction of prestressed girders for bridge construction and other specialized applications like offshore structures and infrastructure projects  in which high performance (e.g., low permeability) is required. 

Today concretes having compressive strengths up to 140 MPa and above can be produced, with strengths of 172 MPa and above attainable through use of special fabrication procedures.

Generally, concrete structural members perform well under fire situations. Studies show, however, that the performance of HSC differs generally from that of NSC and may not exhibit good fire performance. Spalling under fire conditions is one of the major concerns with HSC.
Previous Next
image
blog comments powered by Disqus
References:
1. "Fire Performance of High-Strength Concrete Structural Members" by V.K.R.Kodur
2.  "The effect of fire-Concrete Spalling"  from http://www.promat-tunnel.com
image
 

ConcreteBasics.org's Newsletter
* indicates required
Question-Answer forum
Submit an article
Photo Gallery