Asked by: Fernando Delannoy
 asked in category: General Last Updated: 22nd March, 2020

What is a concrete zip strip?

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.

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Moreover, what are zip strips?

Definition of Zip Strip in Construction: 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.

Also Know, why do they cut lines in concrete? If you're using concrete to make a sidewalk, the shrinking concrete will cause cracks to appear as it dries. To prevent sidewalks from cracking in random spots and breaking apart, builders make lines in sidewalks. Of course, they don't just call them lines. The technical term for sidewalk lines is contraction joints.

Additionally, when Should expansion joints be cut in concrete?

Saw cutting cuts joints as soon as the concrete is hard enough that the edges abutting the cut don't chip from the saw blade. Cutting joints soon enough. In hot weather, concrete might crack if joints are not cut within 6-12 hours after finishing concrete.

How deep should saw cuts be in concrete?

1.5 to 2 inches

32 Related Question Answers Found

Where do you put expansion joints in concrete?

So for a 4 inch thick concrete slab, expansion joints should be no more than 8 to 12 feet apart. They should also be placed around structures that go deeper than the concrete slab, such as columns or walls.

How do you build expansion joints in a concrete slab?

These joints can also be cut into the slab once the slab has cured enough to prevent chipping during the cut. The goal of the control joint is to allow the slab to crack, during expansion and contraction, in a known location and in a straight line. Expansion joints are put in place before the concrete is poured.

Are concrete expansion joints necessary?

Expansion joints are virtually never needed with interior slabs, because the concrete doesn't expand that much—it never gets that hot. Expansion joints in concrete pavement are also seldom needed, since the contraction joints open enough (from drying shrinkage) to account for temperature expansion.

What is the difference between expansion joints and control joints?

A control joint is used to reduce the occurrence of shrinkage in concrete, and it is usually a continuous, vertical joint filled with mortar. An expansion joint is a continuous or horizontal joint. Unlike control joints, expansion joints are left completely free of mortar.

How long does concrete take to crack?

Cracking typically starts within 12 hours of the finishing process, but it can be slowed or accelerated by weather conditions. Shrinkage cracking is typically planned for and handled with control joints. Control joints are designed cuts that go at least half way through the thickness of the concrete slab.

What material is used for expansion joints in concrete?

Minimize Concrete Cracking and Damage with Expansion Joints. ASPHALT EXPANSION JOINT is composed of a blend of asphalts, vegetable fibers, and mineral fillers formed under heat and pressure between two asphalt-saturated liners. It is waterproof, permanent, flexible, and self-sealing.

Can you cut concrete with a Sawzall?

Cutting concrete with a reciprocating saw begins with safety gear. Cutting concrete creates dust and sends sharp shards of material flying toward the tool operator. Because concrete dust can cause respiratory discomfort or damage, reciprocal saw operators must wear face masks or respirators.

Do you need expansion joints in concrete slabs?

Long stretches of concrete do not require intermediate expansion joints. Proper use of contraction joints at short spacings of 5 feet will allow for proper movement of the individual sidewalk slabs.

Why do you need expansion joints in concrete?

Expansion joints are placed in concrete to prevent expansive cracks formed due to temperature change. Concrete undergoes expansion due to high temperature when in a confined boundary which leads to cracks.

Can I cut concrete with a circular saw?

Use a standard circular saw, equipped with a corundum or diamond blade, for small tasks. For slabs, it's best to cut through the top inch, then use a sledgehammer to break off the rest. The jagged edge left below the cutting line provides a good rough edge for the new concrete to bond to.

Is it too late to cut control joints?

WHEN TO SAW CONTROL JOINTS Cutting freshly poured concrete too late can lead to unwanted cracks in the concrete, rendering the joints ineffective. For most concrete work, cutting should take place within the first 6 to 18 hours and never beyond 24 hours.

Does rebar prevent cracking concrete?

Without rebar reinforcement, concrete is highly prone to cracks due to tension forces. Rebar helps prevent cracks from growing wider largely by preventing cracked slabs from moving apart.

What should I put between concrete slabs?

An expansion joint is a material placed in the cracks (or joints) between concrete slabs to protect the slabs from cracking when they contract and expand as the temperature changes. This material acts as a shock absorber, absorbing the stress from the slab's movement.
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