Technical Knowledge
How To Control Ground-Based Ground Cracking
There are two ways to control ground-based ground cracking:
Control the location of the crack by installing a shrink seam (the crack width cannot be controlled)
Control the crack width by installing a reinforcement device (the crack position cannot be controlled)

(Vanse YZ30-4E Laser leveling On Working Site)
Control the location of the crack by installing a shrink seam:
Control the cracking position of the concrete slab; the width of the shrink joint or the crack in the joint is largely controlled by the joint spacing and concrete shrinkage. As the seam spacing and concrete shrinkage increase, the seam width also increases.
Similar to the crack, if the seam width is close to about 0.9 mm, the efficiency of locking and transferring the aggregate between the aggregates and avoiding vertical displacement between the seams is greatly reduced. In view of this, many designers use load-conducting designs such as force-transmitting rods, force-transmitting sheets, or continuity-enhancing devices at the shrink seam position to ensure good load transfer and limit vertical displacement between seams.
Care must be taken when using the above-mentioned one crack control method on the same floor. If a large number of reinforcing devices pass through the expansion joint, the seam will become too hard to crack and open as designed. When the shrink seam is unable to be activated (ie, cracked and opened) due to the action of the reinforcing device, cracking at a non-seamed portion or a random position is generally generated.
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About the Author: Shandong Vanse Machinery Technology Co., Ltd.
Shandong Vanse Machinery Technology Co., Ltd. is a high-tech manufacturer specializing in concrete construction machinery, including laser screeds and related equipment. The company integrates R&D, production, and global sales, with products exported to over 60 countries and widely used in infrastructure projects worldwide.
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