Compaction of each thin layer of backer is a critically important step in the fabrication of GFRC. Compaction serves four important functions that are essential to achieving the high flexural strength GFRC is known for.
- Fibers are oriented in the plane that the tensile loads develop in.
- Fibers are compacted into a thinner, more dense layer.
- Trapped air voids are eliminated.
- Interlayer bonding is enhanced.
Compaction is achieved during casting by rolling each layer of the freshly applied backer using a compaction roller.