Attached is test result just received from Twining Laboratories who is in business for over 100 years.
They went pick up 9 Filter Pavers from our yard in Carson city themselves. It is only 9 miles away from their lab.
Amazing average Net psi at 4,400! (ASTM C90/C140)
It surpasses Standards for Concrete Masonry Units requirements.
We can make even higher psi value with improved specification. A 2013 testing result done by NCMA (National Concrete Masonry Association) rated Rechsand pavers at 7,350 psi.
Average concrete – 2,700 to 5,500 psi
Porous concrete – 2,700 to 3,000 psi
Quote: In the laboratory, pervious concrete mixtures have been found to develop compressive strengths in the range of 500 to 4000 psi (3.5 MPa to 28 MPa), which is suitable for a wide range of applications. Typical values are about 2500 psi (17 MPa).
Quote: This pavement structure is commonly used for both pedestrian and vehicular applications. Pedestrian areas, driveways, and areas subject to limited vehicular use are paved with units 2 3/8 in. (60 mm) thick. Streets and industrial pavements should be paved with units at least 3 1/8 in. (80 mm) thick.
The dimension of our Filter Paver tested is W=5.88 H=2.55 L=11.76 which meets first requirement.
We can custom make specifically for the second requirement or any other sizes.