Jahn M90 is a single-component, cementitious, mineral based repair mortar that is designed for the restoration of concrete. Since Jahn M90 is engineered for compatibility, there are two separate formulations for horizontal and vertical applications. In this way, M90 achieves a superior chemical bond to concrete substrates. M90 contains no latex or acrylic bonding agents or additives, nor does it require the application of a bonding agent to achieve adhesion, so it remains vapor permeable. The mortar provides a healthy pH factor and strong resistance to carbonation, creating an environment that does not allow corrosion to begin. The material can be applied in a single layer build-up for faster application and reduced installation costs. M90 is not damaged by salt crystallization, even when heavy concentrations are present. M90 provides a durable repair able to withstand severe environmental conditions and repeated freeze-thaw cycles.