Samcrete Precast Prestressed Hollow Core Slabs 20 cm thickness (8 inch), Light reinforcement, according to ASTM standards with the following specifications:
Concrete
Unit weight : 2200 Kg/m3,
Characteristic Compressive Strength : 350 Kg/cm2,
Release strength (at 3 days) : 260 Kg/cm2,
Modulus of Elasticity (initial ): 220,000 Kg/cm2,
Modulus of Elasticity (final): 290,000 Kg/cm2,
Ambient Relative humidity : 50%
Prestressing Strand
Ultimate strength: 17,570 Kg/cm2,
Initial Prestresse : 0.7 Times Ult,
Minimum cover of strand: 2.5 cm.
Grout
A mixture of not less than one part Portland cement to three parts fine sand. Grout that seeps from the joint shall be completely removed before it hardens. Minimum 28-day compressive strength - 3000 psi.
Bearing Strips
Multi-monomer plastic, hardboard or approved equal.