Rigid Concrete Pavement Construction Joint Detail
Rigid Concrete Pavement Construction Joint Detail
(OP)
Ladies and Gents,
I'm preparing a rigid concrete pavement design for a small office complex. The pavement sections will be 4.0 and 5.0 inches thick. In reviewing details for the different joint designs, I'm in a quandry regarding the "construction" joint detail.
With construction joints in pavements less than 6 inches, using dowels is typically not recommended. Somewhere in the recesses of my brain, I also recall that using a "key" is also subject to questions, since the pavement section is relatively thin and the key tends to break.
Any thoughts or experience on what such a joint should be so that the slabs across the construction joint are interlocked?
Thanks,
theCorkster
I'm preparing a rigid concrete pavement design for a small office complex. The pavement sections will be 4.0 and 5.0 inches thick. In reviewing details for the different joint designs, I'm in a quandry regarding the "construction" joint detail.
With construction joints in pavements less than 6 inches, using dowels is typically not recommended. Somewhere in the recesses of my brain, I also recall that using a "key" is also subject to questions, since the pavement section is relatively thin and the key tends to break.
Any thoughts or experience on what such a joint should be so that the slabs across the construction joint are interlocked?
Thanks,
theCorkster





RE: Rigid Concrete Pavement Construction Joint Detail
RE: Rigid Concrete Pavement Construction Joint Detail
Dik
RE: Rigid Concrete Pavement Construction Joint Detail
1. Maximum joint spacing should be 8 feet for 4" thick pavement and 10 feet for 5". This is in all directions.
2. Try to minimize the number of construction/cold joints.
3. Where cold joints must be made, thicken the slab to 7" and use 1/2 inch smooth epoxy coated steel bars for load transfer.
4. Do not use deformed bars and keyway. Keyway should only be used for longitudinal joints, such as along the center line of a roadway. When keyway is used, deformed bars must be used to hold the keyway together.
RE: Rigid Concrete Pavement Construction Joint Detail
RE: Rigid Concrete Pavement Construction Joint Detail
Thanks for the great input! This parking lot is small in size, without through access. 4-inch pavement will be in parking stalls for autos/light trucks, and 5-inch pavement will provide parking access, moving, delivery, and garbage truck access. Sections will be supported on 4 to 8 inches of compacted baserock.
I plan on 1) limiting construction joints and 2) using a thickened section with dowels where construction joints must be located.
civilperson: My experience with concrete pavement is to avoid using reinforcement (other than doweled joints), especially wire due to the problems of getting it built properly. Even with diligent inspection during placement, mesh seems to alway get displaced, and resetting it during the pour is a always battle. Some structurals I work with will increase slab thickness by 1 inch to avoid the construction problem.
RE: Rigid Concrete Pavement Construction Joint Detail
For any type of light useage, I would not use anything less than 6" thickness.
should read...
For anything other than light useage, I would not use anything less than 6" thickness.