ACI 549.4R-20 (IN-LB, SI) PDF Download

ACI 549.4R-20 is a standard titled "Guide to Design and Construction of Externally Bonded Fabric-Reinforced Cementitious Matrix and Steel-Reinforced Grout Systems for Repair and Strengthening of Concrete Structures." This standard provides guidance on the use of fabric-reinforced cementitious matrix (FRCM) and steel-reinforced grout (SRG) systems for the rehabilitation and strengthening of concrete structures.

The guide explains that FRCM/SRG systems offer an alternative to traditional techniques, such as fiber-reinforced polymers (FRPs), steel plate bonding, section enlargement, and external post-tensioning. FRCM/SRG systems are composite materials made up of layers of inorganic matrix reinforced with dry fibers in the form of open mesh or fabric. The inorganic matrixes are typically cement-based, lime-based, or geopolymer.

The document covers the history and use of FRCM and SRG systems, as well as their unique material properties. It also provides recommendations for the design, construction, and inspection of these systems. The guidelines are based on experimental research, analytical work, and field applications.