Slab on grade with steel fiber reinforcement
Slab on grade with steel fiber reinforcement
(OP)
Hi,
I have a slab on grade 8'' thick and it will carry heavy vehicle loads, I have specified 15M rebar @ 12'' c/c in each direction. My client is asking me to provide an alternative using fiber steel reinforcement. My question is, how do you calculate it ? what would be the equivalent to 15M ?
I have a slab on grade 8'' thick and it will carry heavy vehicle loads, I have specified 15M rebar @ 12'' c/c in each direction. My client is asking me to provide an alternative using fiber steel reinforcement. My question is, how do you calculate it ? what would be the equivalent to 15M ?






RE: Slab on grade with steel fiber reinforcement
I'm not sure why you have the rebar in the slab, other than for thermal movement, as slabs on grade are quite capable of carrying heavy traffic loads without reinforcement.
RE: Slab on grade with steel fiber reinforcement
Fiber reinforcement help for shear behaviour and cracking only Not bending.
Thus in Canada, i don't know any code (right now) that allow to consider fiber reinforcement to reduce stirrup or increase rebar spacing for cracking (less than 500mm)
A lot of research is done in beam shear reinforcement reduction by adding fiber.
This, if your rebar are required for bending you can't do nothing about it !.
If i am mistaken tell me !
RE: Slab on grade with steel fiber reinforcement
As Ron stated- you might be able to eliminate the reinforcing all together- watch your joint conditions however. I call out dowel baskets and plate dowels at all joints in slabs like this. These help limit curling (which is the cause of a significant amount of slab cracks in heavily loaded slabs)
RE: Slab on grade with steel fiber reinforcement
RE: Slab on grade with steel fiber reinforcement
While I am sure it does provide "some" reinforcement - it's primary use is to temper the surface and protect against these nasty loads.
RE: Slab on grade with steel fiber reinforcement
RE: Slab on grade with steel fiber reinforcement
The fiber I talk about loollike hairpin for steel one and exploded fiber for plastic one.
What amount of bending resistance improvement does these fiber add ?
2)
Note to the original poster : Proven by testing is the key here. As generally prescribe by code, if you specify a different solution than the code requirements, you need to prove the solution by testing (or done by the fiber manifacturer !)
RE: Slab on grade with steel fiber reinforcement
The other significant enhancement is that we were able to construct the entire rocket assembly floor area without a single joint!