Material for reinforcing against the creep of the inner rubber of a tire for a heavy duty civil engineering vehicle

A tire for a civil engineering vehicle comprising a crown connected to two sidewalls extended by two beads, the assembly delimiting an inner cavity intended to be inflated with a gas, and comprising, starting from the inner cavity:

• an airtight inner layer forming a wall of the inner cavity, intended to come into contact with an inflation gas, having a thickness E1 and consisting of an elastomeric mixture M1;
• an anti-creep layer on the outside of the airtight inner layer, having a thickness E2 and consisting of an elastomeric mixture M2 having an elastic loss P60 measured at 60° C., the anti-creep layer and airtight inner layer extending over an entire inner surface of the crown of the tire;
• a carcass layer, on the outside of the anti-creep layer, consisting, from inside to outside, of an inner carcass coating layer, in contact with the anti-creep layer and having a thickness E3, a layer of metal reinforcers and an outer carcass coating layer, the inner and outer carcass coating layers consisting of an elastomeric mixture M3;
• the thicknesses E1, E2 and E3 being measured in a shoulder region forming the transition between the crown and each sidewall of the tire,
• wherein the airtight inner layer has a thickness E1 between two and four millimetres, the sum E2+E3 of the thicknesses E2 of the anti-creep layer and E3 of the inner carcass coating layer, respectively, is at least equal to 6 mm, the ratio E1:E2 between the thickness E1 of the airtight inner layer and the thickness E2 of the anti-creep layer is at most equal to 0.60 and the viscoelastic loss P60 of the elastomeric mixture M2 of the anti-creep layer is at most equal to 20%.