The interface between old and new concrete is the weakest link in any repair project. Peeling, hollow spots, and cracking almost always start from bond failure at this interface. To solve the problem, we must look beyond the strength of the mortar itself and understand the roles HPMC and RDP play right at the interface.
Repair mortar is designed to restore damaged concrete. Yet, all too often, it fails prematurely. Cracks reappear along the bonding line. Edges lift. Entire patches detach from the old substrate. This is aging in action, and it almost always begins at the new‑to‑old interface. To understand how to stop it, we first need to look
The mission of repair mortar is to form a strong, durable restoration layer on existing concrete surfaces. Unfortunately, the reality often falls short. Not long after application, cracks appear along the interface, edges curl up, or entire sections debond. These are classic signs of aging. The root cause lies in two things: the decay of
