Non-combustible reinforced cementitious lightweight panels and metal frame system for shear walls

摘要

A non-combustible shear wall system 5 for construction comprising metal screw fasteners with winged drillers wherein the winged drillers are located above the point and below the first thread of the screw and protrude laterally from a shaft of the screw, light gauge cold rolled metal frame, a vertical shear diaphragm fastened by the fasteners to the light gauge cold rolled metal frame, the vertical shear diaphragm comprising a reinforced, lightweight, dimensionally stable cementitious panel 4 and the framing comprising metal studs, the panel 4 having a density of 65 to 90 pounds per cubic foot and capable of resisting shear loads when fastened to framing and comprising a continuous phase resulting from the curing of an aqueous mixture comprising, on a dry basis, 35 to 70 weight % reactive powder, 20 to 50 weight % lightweight filler, and 5 to 20 weight % glass fibers, the continuous phase being reinforced with glass fibers and containing the lightweight filler particles, the lightweight filler particles selected from at least one member of the group consisting of ceramic microspheres, glass microspheres, fly ash cenospheres and perlite having a particle specific gravity of from 0.02 to 1.00 and an average particle size of about 10 to 500 microns (micrometers), wherein the panels are 3/8-3/4 inch (9-19 mm) thick, and the system 5 having the 3/8-3/4 inch (9-19 mm) thick panels fastened to laterally braced said light gauge cold rolled metal frame when tested according to ASTM E-72-05, effective 2005, has a nominal wall shear capacity of 200 to 1200 pounds per linear foot, wherein the panels fastened to said light gauge cold rolled metal frame when tested according to ASTM D-1761-88, effective 1988 (reapproved 2000), has a dry lateral screw resistance of 350 to 550 pounds, wherein the shear wall system 5 has a 2 hour fire resistance rating under ASTM E-119, effective 2003.