Zip Strip offers an ideal solution for crack control in concrete. This a rigid, preformed contractile joint which creates a straight crack in the surface of the concrete slabs and locks into the aggregate just below the surface. Zip Strip is powerful, inexpensive, and eliminates waste by providing straight lines.
What is a zip strip in construction?
Definition of Zip Strip in Construction: What is a Zip Strip? The term is used for a product that is initially installed in concrete or masonry that has a strip of protective material over a joint, or a receiving reglet. Once the concrete or masonry cures, the protective material is stripped off of the top of the joint or reglet.
How is zipstrip inserted into concrete?
A straight vertical line of weakness is formed where ZipStrip was inserted. The top portion of the ZipStrip is removed leaving the vertical portion in the concrete to form a weakness in the surface of the slab to the ground. The new joint can be tooled with a radiused edger or the surface of the slab can be finished over the top of the joint.
Can you use a plastic zip strip to cut concrete?
Plastic zipstrips sometimes come with a removable top to create a clean joint. Cardinal Mftr. Co. Conventional wet-cut gas-powered concrete saws can be used to cut joints, typically waiting until the concrete achieves a strength of about 500 psi to prevent raveling of the cut edges during sawing.
How do you use zipstrip?
ZipStrip is inserted in the concrete when the concrete is still wet, preferably after screeding and tamping. A straight vertical line of weakness is formed where ZipStrip was inserted. The top portion of the ZipStrip is removed leaving the vertical portion in the concrete to form a weakness in the surface of the slab to the ground.
What is zip strip used for?
ZipStrip is the economic alternative to saw cutting to create similar straight line surface joints. ZipStrip is inserted in the concrete when the concrete is still wet, preferably after screeding and tamping. A straight vertical line of weakness is formed where ZipStrip was inserted.
What is a zip strip in a pool?
ZipStrip is a rigid polystyrene “T” shaped strip. The horizontal portion of the “T” is removable. The top portion of the “T” provides stiffness so. the strip can be placed into the wet surface of a. concrete slab in a straight line.
What is a zip strip control joint?
Plastic Zip Strip Expansion Joint is made up of two pieces fastened together at the factory for ease of installation. It is a semi-rigid contraction joint, which forms a straight edge cut in the concrete surface with an underlying aggregate interlock.
What is a zipper in Masonry?
While the “zipper” allows horizontal movement, it puts the sealant in horizontal shear at the bed joints to do so.
How long do pool strips last?
24-36 monthTest strips typically have a 24-36 month shelf life. Look on container bottom for expiry date. Store reagents and test strips in a cool, dry location, out of direct sunlight. Take your water sample or dip your strip under the surface, so as not to test surface water.
How do you pour a concrete strip?
1:058:51How to Build a Concrete Mow Strip for lawn and Garden - YouTubeYouTubeStart of suggested clipEnd of suggested clipI just measured back from the corner four foot in each direction. And then I cut the two-by-four. SoMoreI just measured back from the corner four foot in each direction. And then I cut the two-by-four. So and I'm going to do the same thing in this corner over here.
What material is used for expansion joints in concrete?
A pliable material is used (asphalt coated, cork, plastic) to construct these types of joints. The material should extend the depth of the slab and extend the full width of the slab. Ideally, for expansion joints on the exterior of a structure, sealing these joint is preferable.
Why are bridges built with expansion joints?
Bridges made of concrete are going to expand and contract slightly for a number of reasons, including temperature changes, shrinkage of the concrete, settlement, ice and even the weight of vehicles. Bridge expansion joints are what allow the concrete to naturally expand and contract without cracking.
Do brick walls need expansion joints?
However, all brickwork should be supported with foam expansion joints. The general thinking in the construction sector is that your expansion joint will be spaced at approximately 10 – 12 metres.
How often do you need expansion joints in brickwork?
With respect to horizontal expansion joints for vertical movement the outer leaf should be supported at intervals of not more than every third storey or every 9 metres whichever is less.
Should expansion joints in brick be filled?
Horizontal expansion joints are also recommended when brick is used as an infill material within the frame of the structure. Expansion joints must be provided between the top course of brickwork and the member above.
How to insert a zip strip in concrete?
ZipStrip is inserted in the concrete when the concrete is still wet, preferably after screeding and tamping. A straight vertical line of weakness is formed where ZipStrip was inserted. The top portion of the ZipStrip is removed leaving the vertical portion in the concrete to form a weakness in the surface of the slab to the ground. The new joint can be tooled with a radiused edger or the surface of the slab can be finished over the top of the joint. As the slab shrinks during the normal curing process a slight straight line separation on the surface of the slab will appear where ZipStrip was inserted.
What is a zip strip?
ZipStrip is the economic alternative to saw cutting to create similar straight line surface joints.
How deep should a groove be in a concrete slab?
There are several methods for tooling a joint into a concrete slab during the finishing operations, but as with a saw cut, the depth of the groove needs to be at least one-quarter the slab thickness to weaken the slab enough to get the crack to follow. For more information on groovers, and a demonstration video with Bob Harris, click here: Groovers Info & Demo Video.
Where to place rebar in slab?
You can also place a couple of pieces of rebar diagonally in the slab near the corner. In most cases, do not extend reinforcement through a contraction joint.
How long after concrete is a window cut?
The timing varies depending on the temperature and the relative humidity, but the window is generally 4 to 12 hours after concrete placement. The cut depth should be at least ¼ the thickness of the slab. For decorative work or smaller slabs, a regular dry-cut cut-off saw can be used.
Do ACI 360 joints need zip strips?
Some come with a capping strip that is removed to leave radius edges or a sealant reservoir in the top part of the joint. ACI 360 and 302 do not recommend the use of zip-strips to form contraction joints. When a joint tees, a crack frequently forms on the other side of the joint.
Do zipstrips come with a removable top?
Plastic zipstrips sometimes come with a removable top to create a clean joint. Cardinal Mftr. Co.
Does concrete shrink after being placed?
After concrete is placed it is going to shrink. We can reduce shrinkage with good mixes, but it is always going to shrink and we need to accept that fact and know how to accommodate that shrinkage. A smooth, unrutted subbase and a moisture barrier directly under the slab reduce friction between the slab and the subbase and reduce internal restraint.
