Bituminous waterproofing membrane comprising a recycled bituminous binder, a reinforcement and a rejuvenator

A recyclable waterproofing membrane, comprising:

• a. a bituminous binder comprising a recycled bituminous binder (RBB), optionally a fresh polymer and optionally fresh bitumen;
• and
• b. a reinforcement;
• wherein the bituminous binder comprises a rejuvenator selected from the group consisting of bio-based oils and/or mineral;
• and
• wherein the cold flexibility of the bituminous binder is from −10° C. to −35° C.;
• and
• optionally wherein the recycled bituminous binder is obtained by grinding and melting waterproofing membranes comprising bituminous binder, polymers and a reinforcement.

A process for improving the performance of recyclable waterproofing membranes comprising a recycled bituminous binder and a reinforcement, wherein a rejuvenator is added to the recycled bituminous binder, and wherein the cold flexibility of the bituminous binder comprising the rejuvenator is from −10° C. to −35° C. and optionally for one or more of:

• Regenerating the polymer;
• Decreasing the viscosity, for decreasing the viscosity of the bituminous binder comprising the RBB wherein the viscosity is decreased to be 5000 mPa·s to 25000 mPa·s;
• or
• Increasing the penetrability at 25° C., from 25 dmm to 40 dmm;
• wherein the rejuvenator is selected from the group consisting of bio-based oils and mineral oils;
• wherein the recycled bituminous binder is obtained by grinding and melting waterproofing membranes comprising bituminous binder, polymers and a reinforcement.

A method of using a rejuvenator:

• wherein the rejuvenator is part of the recycled bituminous binder, and wherein the cold flexibility of the bituminous binder comprising the rejuvenator is from −10° C. to −35° C. and optionally for one or more of:
• Regenerating the polymer;
• Decreasing the viscosity, for decreasing the viscosity at 180° C. of the recycled bituminous waterproofing membranes to 5000 mPa·s to 25000 mPa·s;
• or
• Increasing the penetrability at 25° C., from 25 dmm to 40 dmm;
• in recycled bituminous binders;
• wherein the rejuvenator is selected from the group consisting of bio-based oils and mineral oils;
• wherein the recycled bituminous binder is obtained by grinding and melting waterproofing membranes comprising bituminous binder, polymers and a reinforcement.