BASF MasterBrace FIB

MasterBrace FIB is TRSC's alternative CFRP wrap specification, used on the same job profiles as Sika SikaWrap-300 C: shear strengthening of beams, column confinement, wrap-around strengthening of irregular substrate geometry, and end-anchorage U-wraps to MasterBrace LAM plate installations. The product is selected over the Sika alternative on three grounds: (1) supply chain alignment with a Master Builders Solutions integrated system on the project, where MasterEmaco repair mortars, MasterProtect coatings and MasterBrace strengthening are nominated as a single-supplier system; (2) where the MasterBrace LAM plate is also nominated for primary flexural strengthening, MasterBrace FIB is the engineering choice for U-wrap end anchorage to maintain the single-supplier system through the strengthening package; (3) where the MasterBrace technical support and design assistance offering provides additional value to the project, particularly on complex hybrid plate-and-wrap strengthening designs. The most common specification pitfalls TRSC encounters in the field are essentially identical to those for the Sika CFRP wrap system: substrate corner radius (25 mm minimum on all corners that the wrap will turn around — substrates with sharp corners cause transverse splitting of the fabric and zero design contribution), impregnation completeness (visual transparency of the wet fabric is the field acceptance criterion — dry patches indicate fibres that contribute no strength at strain), and joint overlap detailing (100-150 mm minimum in the fibre direction with the overlap fully impregnated and consolidated). Two additional MasterBrace-specific considerations are: (1) the MasterBrace SAT 4500 saturation resin has a pot life of approximately 40 minutes at +20°C and 20 minutes at +30°C, which is shorter than some alternative systems and requires careful batch sizing on hot Queensland days; mixing in smaller batches and pre-cooling the resin components are practical mitigations; (2) the MasterBrace system's published design properties are based on the dry-fibre cross-section (consistent with FIB Bulletin 14 design methodology), and the design CFRP area must be calculated on the dry-fibre cross-section rather than the cured-laminate cross-section. TRSC strengthening designs that nominate MasterBrace FIB include the MasterBrace P 3500 primer specification, the MasterBrace SAT 4500 saturation resin specification, the corner radius preparation specification, the joint overlap detail, and a witness hold point for the first wrap installation. The product was specified on Waterfront Place beam shear strengthening as the engineered alternative to additional internal stirrup retrofit, with U-wrap CFRP providing the supplementary shear capacity at significantly reduced disruption to the in-service occupancy.