GEOLOGY

Detailed explanation-1: -Control joints are planned cracks which allow for movements caused by temperature changes and drying shrinkage. In other words, if the concrete does crack-you want to have an active role in deciding where it will crack and that it will crack in a straight line instead of randomly.

Detailed explanation-2: -The biggest factor that causes expansion joints in concrete to crack is temperature. Almost always, premature cracking is due to poor planning and wrong material choice. Engineers design expansion joints to accommodate movement due to physical forces resulting from temperature fluctuation.

Detailed explanation-3: -What are Crack Control Joints?-These joints allow cracking in a controlled area as the slab settles over time. These are also known as break joints, construction joints or saw-cut joints. Usually these are cut into the slab after the concrete hardens.

Detailed explanation-4: -Concrete expands and contracts with changes in temperature and moisture. If not properly controlled, cracks can begin to appear. Placement of concrete control joints and expansion joints are crucial when designing and pouring concrete slabs and sidewalks.