Supports the following standards: ASTM C1019
The grout paper is cut to dimensions of 7 1/2″ x 12″ and scored in three places to allow the paper to be folded into a 3″ x 3″ x 7.5″ prism. The grout paper molds are then placed into a cavity created by properly arranging concrete masonry units (CMU) and/or bricks to the same dimensions. The grout is then placed and consolidated into the cavity lined by the Humboldt grout paper.
Not only is this method more economical than the corrugated cardboard boxes which are commonly used, it also meets the guidelines of ASTM C-1019: for a thin, permeable material to prevent bond. In addition, the permeable grout papers are rigid enough to help prevent casting irregular shaped specimens which the use of thinner materials can possibly yield. Using our grout papers to create compressive strength specimens in accordance with procedures outlined in ASTM C1019 will eliminate the need to make comparison samples if proposing to employ alternative methods of creating test samples as noted in the standard.” Even if you are making 4 specimens like the corrugated cardboard boxes, Humboldt Grout paper is less expensive per specimen.