The regulations to use FRCM systems

Ruregold has been the first Italian company who pays attention to the certification of FRCM strengthening systems.

From 2011 Ruregold has started a qualification process of some of its FRCM systems with the University of Miami (Florida – USA).

For some of its FRCM with PBO and Carbon fibers, Ruregold has obtained the Evaluation Service Report (ESR n. 3265) released by ICC-ES (International Code Council – Evaluation Report) according to the USA Guidelines AC 434 “Acceptance criteria for masonry and concrete strengthening using fabric-reinforced cementitious matrix (FRCM) and steel reinforced grout (SRG) composite systems” for the certification of FRCM fiber-reinforced compounds with inorganic matrix.

The product regulation AC 434 is based on selective criteria and it requires several tests in order to be issued.

KIND OF TEST ON MATERIAL ACCEPTANCE CRITERIA for the E.S.R.’s Issue for FRCM systems according to AC 434 regulation
Tensile strength YES
Ambient durability YES
Interlaminar sheerstrenght YES
Property of matrix YES
Resistance to combustible reagents YES
Adhesion YES
Fire resistance degree YES
Finishing YES

AC 434 regulation requires further tests on full-scale structural elements like reinforced beams resistant to bending and shear, compressed pillars and reinforced walls resistant to bending and compression in and out of the plane.

Beside the qualification tests of materials, it requires also tests in order to identify the structural performances and, in particular, it needs the following tests on FRCM-reinforced structural elements:

  • tests to bending and shear on reinforced beams;
  • tests on reinforced pillars;
  • tests to bending on walls;
  • tests to shear on walls;

The E.S.R. certification for FRCM materials is subjected to annual quality control in order to be renewed.

Regulatory framework relative to strengthening systems

Design Guidelines Qualification Guideline Product Certification
ACI 549.4R-20
norma ACI-549-4R-20-calcestruzzo
A.C. 434/2019
norma ac434-2019
E.S.R. N°3265
certificato-ICC-ES-2021-ruregold

Design Guidelines
ACI 549.4R-20: Guide to Design and Construction of Externally Bonded Fabric-Reinforced Cementitious Matrix and Steel-Reinforced Grout Systems for Repair and Strengthening of Concrete Structures.

Qualification Guidelines
A.C. 434/2019: Acceptance criteria for masonry and concrete strengthening using fabric-reinforced cementitious matrix (FRCM) and steel reinforced grout (SRG) composite systems.

Product Certification
E.S.R. N°3265: ICC-ES Evaluation Report.