filling the joints with polymeric sand
Photo: Russell Kaye
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Filling the Joints

The stone-setting mix needed a day to cure, then the crew filled the joints with polymeric sand, a material laced with plastic binders that glue the sand grains to each other. After sweeping a 1-inch-thick layer into the joints, they tamped it down with a spray of water, which activates the binders. Another layer, dampened with more water, filled the joints. Two days later, the joints had hardened and the apron was ready for its inaugural drive.
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