Fire Resistance of Hilti Chemical Adhesive 1

[asixth]

Hi guys,

How does hilti chemical adhesive perform when exposed to fire for a prolonged period of time. I am looking at a steel I-beam framing into a tilt-up concrete wall panel, typical we provide cast-in anchors because of the common perception that the adhesive of a chemical anchor will 'melt away' during a fire and consequently the tilt-up will fall outwards creating a potentially dangerous situation.

Because of this perception we have always provided cast-in or mechanical anchors for this connection so this situation is avoided.

I was reading a hilti brochure toady that was saying that chemical adhesive has good fire-performance. Is this true and does anyone else provide the detail that I have explained above of should I be keeping with the mechanical anchoring.

 

[PST09]

Hilti are members of the ASFP (Association for Specialist Fire Protection)and have various other fire related affiliations.

I would contact them and they may be able to provide you with a certificate of approval (or testing) which may state the hours of fire resistance the anchors offer before failure.

On the hole Modern day chemical anchors are advanced and depending on the type can have a good fire resistance.

PST

 

[hokie66]

asixth,

Nothing against Hilti, but for these type connections, I would stick with cast in ferrules, with expansion anchors for secondary connections if required. When the steel fails in a fire, it needs to be able to pull the wall inward with it rather than allowing the wall to fall outward. So I don't want to depend on adhesive anchors.

 

[rowingengineer]

Asixth,
I agree with Hokie, The hilti product do come with a fire rating level, these rating are using the concrete as a heat sink, but they will fail after you get past your nominated level, then teh panel falls outward. If your in Aust you will have to design them for 3 times the load of a cast-in feral to complie with the BCA.

Henry & Hymes have a good article on tilt panels in a fire, here they give reduction factors for different items in temperature situations, for a cast-in anchor you get 0.7 reduction compared to of 0.05 to 0.01 for chemical anchor (published by Hitli). I know which one I would want to bet my house on.



When in doubt, just take the next small step.