Two new developments have recently occurred regarding the installation of contraction joints in slabs-on-ground. First, the ACI Committee on Residential Concrete now recognizes joints, installed soon ...

A contraction is the phase of the business cycle when the economy declines, often with falling real GDP and rising unemployment, moving from peak toward trough (expansion, peak, contraction, trough).

Contraction joints (sometimes called control joints) are used in unreinforced and lightly reinforced slabs-on-ground to minimize random cracking. By creating straight-line weakened-planes in concrete, ...