A summary of the full scale wall trials carried out at Wexham Springs by the BCA is shown below.

The arrangement of one of the wall trials is also shown.

Pressure Conversion

For concrete in Group 1 to 5, to convert the CIRIA design pressure into the applied concrete pressure on a Hy-Rib face:

For P_max 0 to 75kN/m²:

multiply by ratio 38/75 = 0.506
P_max X 0.506 = Hy-Rib pressure

For P_max greater than 75 kN/m²:

use P_max = 38 kN/m²