Contraction Joint for Slab on Grade
Contraction Joint for Slab on Grade
(OP)
i have a slab on grade 150 mm Thickness not heavly loaded(just ground slab for residuntal building) i am now detailing contraction joint, i checked ACI and found i can use Saw cut joint,keyed joint or doweled joint, but i have a question.
can i extend the mesh reinforcement normaly at location of contraction joint when i am using saw cut or keyed joint?
or should i disconnect it?
can i extend the mesh reinforcement normaly at location of contraction joint when i am using saw cut or keyed joint?
or should i disconnect it?






RE: Contraction Joint for Slab on Grade
2. Cut it all at the joint
3. Cut every other wire at the joint.
We usually do 1 or 3.
RE: Contraction Joint for Slab on Grade
DaveAtkins
RE: Contraction Joint for Slab on Grade
so if i have WWF at the middle then why to cut it?
i think i just cut the SOG to have a weak section where shrinkage is controlled to occur at it. WWF may help in vertical load transfer
that is my opnion
RE: Contraction Joint for Slab on Grade
Generally, I only consider the WWF for tempature and shrinkage crack control, not for load transfer.
Don't know if avialable in your location, but have you considered fibermesh reinforcing. This is becoming quite prevelent in our area (Nebraska, USA). Easier to place than WWF, which tends to get trampled down to the bottom in slab on grades.
RE: Contraction Joint for Slab on Grade
h
www.SlideRuleEra.net
RE: Contraction Joint for Slab on Grade
for slabs with people loads only, using the fibermesh should work well. the sawjoints and construction joints must be placed at about 8 to 10 feet on center in each direction. A concrete mix with a low water/cementitious ratio should be used to help reduce overall shrinkage.