A small concrete slab doesn’t cost much to DIY ... using a trowel or flat shovel, to fill voids. If the form appears to be full and the surface is even, use a hammer to gently tap the form ...

ASTM E1745-11: Standard Specification for Plastic Water Vapor Retarders used in Contact with Soil or Granular Fill under Concrete Slabs ASTM E1643-11: Standard Practice for Selection, Design ...

SL/45 is used to fill random cracks ... memory capability while allowing normal joint movement and accommodating slab movement where designed movement and thermal cycling will occur ...