Take a pail of warm, soapy water and a stiff 3 inch bristle brush and scrub the broken edges of both sections of the basin. Allow the concrete to dry.
Cut the pointed tip off the end of the tube of masonry construction adhesive with a utility knife. Load the tube of adhesive into a caulk gun. Break the seal on the tube by plunging a long nail or a metal skewer down the tube.
Repeatedly press the trigger of the caulk gun to drive the adhesive through the long tube so it comes out of the end. Apply the adhesive to both edges of the basin.
When application of the adhesive is completed, back the pressure off of the tube of by pulling the L-shaped rod straight back. Set the caulk gun and adhesive aside.
Press the two sections of the basin together making sure there is a tight fit. Take the bungee cords with hooks on each end and wrap them tightly around the basin and hook ends together to clamp the concrete sections together. Wipe away any excess adhesive with paper towels.
Let dry per instructions on product label.