In case anyone is interested, I cast a sample panel with 1:1 sand/cement and 2.5% chopped alkali-resist glass fibres from Fibre Technologies International, see
- posted
17 years ago
In case anyone is interested, I cast a sample panel with 1:1 sand/cement and 2.5% chopped alkali-resist glass fibres from Fibre Technologies International, see
Better than accoustic plasterboard?
Out of interest, why 1.3:1? Presumably youre loooking for max poss strength, but doesnt 1.3:1 microcrack badly, reducing its strength advantage?
Your fibre cost is high, but that will make a lot of cast crete. Last time I was quoted something like =A32 for a bundle of polypropylene.
NT
Isn't this the way they make promenade tiles which have been around for many a year? GRP reinforced concrete?
Tell me more, I'm new to all this.
1=2E3 ? You're including the weight of the fibres ? I understand the fibres prevent cracking, but I don't know if this is the same as preventing micro-cracking ? I understand for max strength you need max cement without the cracking. What mix would you suggest ? If more sand will improve things, obviously that's good as it will cost less !I believe glass fibres are better at reducing cracking since they flex less than polypropylene.
Cheers, Simon.
I guess acoustic plasterboard is just heavy plasterboard. The fibre-concrete is certainly heavier than that, so I guess it would be better. Simon.
Did you buy if from them directly?
I did - I was having great difficulty finding any suppliers, so I went for the first one. Most of the glass fibre around is for fibreglass and not alkali-resistant I phoned them up - most helpful, suggested the mix, type of fibre etc for my application. They also suggested a superplasticiser to reduce the water content (more cost), but I thought I'd start my experiments without it. I think it is used where very fine moulds must be filled, and the stuff must flow freely. On top of the price I mentioned was VAT and delivery - not too cheap over all. The fibres actually come from Japan I think - its marked on the bag. I will check the actual source, and post it later. Simon.
I think that also contains a polyester resin, i.e. its actually a mix of fibreglass and cement. Simon.
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