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To fully understand the life cycle impact of polyurea joint fillers let s first look at the life of a concrete control joint.
Contraction joints in concrete floors. These joints are placed in the slab as an allowance space for concrete expansion. Both isolation and construction joints are formed before the concrete is poured. When using joint groove for contraction joints the joint should be a minimum depth of thickness of the slab. What a contraction joint really is in the end is a crack in the slab that we force to follow a line of our own choosing.
Temperature changes make concrete expand and contract. Concrete contraction joints are intended to create weakened planes in the concrete and to help regulate where cracks will occur. Contraction joints are typically installed with jointing tools while the concrete is still plastic or by sawing after the concrete has been finished with either a wet cut saw or more commonly an. Soff cut s 150d saw is designed for decorative cuts.
A fresh concrete mixture is a fluid plastic mass that can be molded into virtually any shape but as the material hardens there is a reduction in volume or shrinkage. Early entry saws make a nice clean cut for decorative concrete joints. Saw cut contraction joints are ideal for decorative concrete because the joint is narrower and cleaner than a tooled joint. Saw cut joints should be done within 4 to 12 hours after the concrete has been finished.
Simply contraction joints are pre planned cracks made by saw cutting or tooling a joint in the concrete. Keyed joints are not recommended for industrial floors. Contraction joints are the most common type of joint in concrete pavements thus the generic term joint generally refers to a contraction joint. Contraction joints are chiefly defined by their spacing and their method of load transfer.
They are generally between 1 4 1 3 the depth of the slab and typically spaced every 3 1 15 m. Contraction control joints are placed in concrete slabs to control random cracking. The gaps in concrete are known as control joints or expansion and contraction joints and they are there for a substantial reason. The rugged life of a control joint as we know control joints more properly according to the american concrete institute contraction joints are essentially planned cracks that allow for movements caused by.
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