concrete reinforcing fibres
 

I'm planning on laying a concrete slab. In an attempt to stop it cracking
I'm considering adding fibres to it. Now, it'll only be a couple of m3 of
concrete, so I reckon I'll only need about 1kg of fibre. Anyone know
where I can buy some in this quantity?

Pete

--
.................................................. .........................
.. never trust a man who, when left alone ...... Pete Lynch .
.. in a room with a tea cosy ...... Marlow, England .
.. doesn't try it on (Billy Connolly) .....................................

concrete reinforcing fibres
 

Peter Lynch wrote:
I'm planning on laying a concrete slab. In an attempt to stop it
cracking I'm considering adding fibres to it. Now, it'll only be a
couple of m3 of concrete, so I reckon I'll only need about 1kg of
fibre. Anyone know where I can buy some in this quantity?

Pete

1kg of fibre for a couple of cubic metres of concrete? - this is a waste of
time and money...unless you meant a couple of square metres of concrete
(m2)?

If you did mean square metres, then you don't need fibre anyway, so long as
the concrete is at least 100mm thick.

concrete reinforcing fibres
 

Phil L wrote:
Peter Lynch wrote:

I'm planning on laying a concrete slab. In an attempt to stop it
cracking I'm considering adding fibres to it. Now, it'll only be a
couple of m3 of concrete, so I reckon I'll only need about 1kg of
fibre. Anyone know where I can buy some in this quantity?

Pete

1kg of fibre for a couple of cubic metres of concrete? - this is a waste of
time and money...unless you meant a couple of square metres of concrete
(m2)?

If you did mean square metres, then you don't need fibre anyway, so long as
the concrete is at least 100mm thick.

1kg per 5000kg, you'd want a lot more than 1kg. 1% is 50kg. Fibre
greatly reduces cracking by increasing tensile strength and controlling
any cracking that occurs, so if you've got easy access to it its worth
using for longer life and much less cracking risk. Also means thinner
crete wll work satisfactorily.

The cheapest source of fibre is probably scrap 100% synthetic clothes
shredded. I dont remember what company I, it was a while ago. Since
then I just made my own from junk. Its used primarily in bridge
building, so perhaps search terms like nylon polypropylene fibre
reinforcement bridge might work.


NT

concrete reinforcing fibres
 

Peter Lynch wrote:
I'm planning on laying a concrete slab. In an attempt to stop it cracking
I'm considering adding fibres to it. Now, it'll only be a couple of m3 of
concrete, so I reckon I'll only need about 1kg of fibre. Anyone know
where I can buy some in this quantity?

Pete

Just done similar, for a thin wall, search for the thread with subject:
"fibre re-inforced concrete/cement followup".
I used glass fibres from fibretech.
Simon.

concrete reinforcing fibres
 

On 23 Oct 2006 00:54:18 -0700, sm_jamieson wrote:

Peter Lynch wrote:
I'm planning on laying a concrete slab. In an attempt to stop it cracking
I'm considering adding fibres to it. Now, it'll only be a couple of m3 of
concrete, so I reckon I'll only need about 1kg of fibre. Anyone know
where I can buy some in this quantity?

Pete

Just done similar, for a thin wall, search for the thread with subject:
"fibre re-inforced concrete/cement followup".
I used glass fibres from fibretech.
Simon.

Thanks Simon, that's a very helpful response. I had been basing my
requirements on the sort of cost/dosage shown here
http://tinyurl.com/yhvb6u which was about the only quantative information
I found.
This came out at a couple of quid for a 1 lb. bag.

Given the relative costs (and minimum order value) I think I'll just
go with the low-tech solution and build it thicker ;-(

cheers
Pete

--
.................................................. .........................
.. never trust a man who, when left alone ...... Pete Lynch .
.. in a room with a tea cosy ...... Marlow, England .
.. doesn't try it on (Billy Connolly) .....................................

concrete reinforcing fibres
 

concrete reinforcing fibres
 

Peter Lynch wrote:
On 23 Oct 2006 00:54:18 -0700, sm_jamieson wrote:

Peter Lynch wrote:
I'm planning on laying a concrete slab. In an attempt to stop it cracking
I'm considering adding fibres to it. Now, it'll only be a couple of m3 of
concrete, so I reckon I'll only need about 1kg of fibre. Anyone know
where I can buy some in this quantity?

Pete

Just done similar, for a thin wall, search for the thread with subject:
"fibre re-inforced concrete/cement followup".
I used glass fibres from fibretech.
Simon.

Thanks Simon, that's a very helpful response. I had been basing my
requirements on the sort of cost/dosage shown here
http://tinyurl.com/yhvb6u which was about the only quantative information
I found.
This came out at a couple of quid for a 1 lb. bag.

Given the relative costs (and minimum order value) I think I'll just
go with the low-tech solution and build it thicker ;-(

cheers
Pete

I didn't get a price, but they had them by the counter at tracis
perkins when I was in today.

A

concrete reinforcing fibres
 

The Natural Philosopher wrote:
wrote:
Phil L wrote:
Peter Lynch wrote:

I'm planning on laying a concrete slab. In an attempt to stop it
cracking I'm considering adding fibres to it. Now, it'll only be a
couple of m3 of concrete, so I reckon I'll only need about 1kg of
fibre. Anyone know where I can buy some in this quantity?

Pete

1kg of fibre for a couple of cubic metres of concrete? - this is a waste of
time and money...unless you meant a couple of square metres of concrete
(m2)?

If you did mean square metres, then you don't need fibre anyway, so long as
the concrete is at least 100mm thick.

1kg per 5000kg, you'd want a lot more than 1kg. 1% is 50kg. Fibre
greatly reduces cracking by increasing tensile strength and controlling
any cracking that occurs, so if you've got easy access to it its worth
using for longer life and much less cracking risk. Also means thinner
crete wll work satisfactorily.

The cheapest source of fibre is probably scrap 100% synthetic clothes
shredded. I dont remember what company I, it was a while ago. Since
then I just made my own from junk. Its used primarily in bridge
building, so perhaps search terms like nylon polypropylene fibre
reinforcement bridge might work.

don'tt be a fule. If you want to stop it cracking lay rebar for big
work, or chicken wire for smaller areas, and don;t mix it too wet, or
let it set too fast. Plenty of water sprinkled over it for several days
after it's laid will help

A perfectly fine option, but dumping some fibres in is quicker, easier,
cheaper, and enables thinner crete, meaning less work and cost again.
So I dont see owt foolish about it.


NT