PrimeComposite Structural Slabs are placed with a new industrial concrete flooring technology. The technology delivers slabs that are resistant to shrinkage and creates tough concrete surfaces. The process also can create a completely jointless slab up to 50,000 sq ft. The special mix design approach can often enable engineers to allow for a reduction in thickness of the floor of up to 70%. Primekss - Rabine North America, LLC.