Specifications often require a two-step procedure for sawing contraction joints in concrete pavements. The first cut, called a green cut, is made with a one-eighth-inch-thick blade that cuts through one-quarter the slab thickness. Green cutting is done as soon as possible to induce cracking through the remainder of the slab thickness and to prevent random cracks between joints. A second cut made 1 to 3 days later enlarges the top of the green cut to form a sealant reservoir with the proper shape factor. Now there is a more efficient way to saw joints by using a patented step-cut blade that performs both the functions at the same time.
Pavement sawing contractor Rick Younger developed the blade which he says lowers cutting costs by reducing sawing time needed. Younger's cutting crews found they could save about 250 man-hours per 100,000 lineal feet of pavement by using the step-cut blade. When the step-cut blade is used, only one water flushing is needed to remove sawing slurry. The earlier sawing also leaves a rougher surface on the joint wall, reducing the sandblasting needed to give the desired texture. Also, the step-cut blade automatically achieves a centered green cut. Using the blade reduces sawing time and permits joints to be sealed as soon as the concrete is dry enough for good sealant adhesion.