Novel cold cured epoxy-silica hybrids as potential adhesives for concrete rehabilitation

Novel hybrid systems, based on a silane functionalized bis-phenol A epoxy and a multifunctional novolac resin, both containing interpenetrating silica domains modified with small amounts of ammonium molybdate, have been investigated as adhesives for concrete rehabilitation. These new experimental formulations have been produced with the aim to achieve a good retention of properties when exposed for prolonged periods to the moist and wet environmental conditions. Particular attention has been given to the evolution and increase in Tg relatively to the neat resin system.