True or False: Contraction joints can be formed by a groover.

True or False: Contraction joints can be formed by a groover.

• A. True
• B. False
• C. Cannot determine
• D. Not common

Answer: (A)

Contraction joints are planned cracks that form as concrete shrinks during curing, easing the development of random cracks. A groover is a tool that cuts a shallow groove into the surface of fresh concrete to create exactly that kind of joint while the concrete is still plastic. When the groove is placed at the right depth—typically about one-quarter to one-third of the slab thickness—and along the intended joint lines, it acts as the contraction joint, giving cracks a controlled path. While saw-cutting or installing preformed joints are also common methods, grooving remains a standard and effective way to form contraction joints in new pours. So the statement is true.

Contraction joints are planned cracks that form as concrete shrinks during curing, easing the development of random cracks. A groover is a tool that cuts a shallow groove into the surface of fresh concrete to create exactly that kind of joint while the concrete is still plastic. When the groove is placed at the right depth—typically about one-quarter to one-third of the slab thickness—and along the intended joint lines, it acts as the contraction joint, giving cracks a controlled path. While saw-cutting or installing preformed joints are also common methods, grooving remains a standard and effective way to form contraction joints in new pours. So the statement is true.