Measures for quality problem of CFRP strengthening

When the bonding quality is not required, the carbon fiber fabric should be cut off along the edge of the empty drum. The size of 100mm is extended to the outer edge of the same carbon fiber material, and the same binder is used in the original.

CFRP strengthening

Self inspection and acceptance criteria for CFRP strengthening are listed in the table below

Item	Standard of qualification	Test method	Region
Stickup position of carbon fiber fabric	Compared with the design requirements, the centerline deviation is less than 10mm	Steel scale measurement	Total
Amount of carbon fiber fabric	More than design quantity	Calculate according to the measurement	Total
Paste qualit	1. single empty drum area < 1000mm2, filling glue repair; above 1000mm2, mending. 2. the ratio of hollowing area to total paste is less than 5%.	Hammer	Total
Carbon fiber adhesive thickness	Carbonf fiber laminate: 2mm + 1.0mm	Steel scale measurement	Sampling inspection
Carbon fiber adhesive thickness	Carbon fiber fabric: ＜2mm	Steel scale measurement	Sampling inspection

When the bonding quality is not required, the carbon fiber fabric should be cut off along the edge of the empty drum. The size of 100mm is extended to the outer edge of the same carbon fiber material, and the same binder is used in the original.

When the strength fails to meet the requirements, the carbon fiber composite material represented by the sample inspection shall be stripped and redone.

The self inspection method of CFRP strengthening is visual inspection or percussion. Inspection standard: the surface of the reinforcement should be strengthened without any glue, gaps, dry yarn, wrinkles, bubbles and sunken defects. Detection time: 3-5 days after completion, check the area with visual or metal mallet (small).

Defect handling of self inspection

Shortcoming	Treatment measures
Lack of glue and ga	Applying more adhesive
Crumpled (carbon fiber)	Grinding and adding subsidized carbon fiber
Dry yarn	Dismantle and adding subsidized carbon fiber
Sunken	Applying more adhesive
Bubble	Length is more than 3mm, grinding and adding subsidized carbon fiber
	Length is less than 3mm, dismantle and adding subsidized carbon fiber
	Iintensive style, grinding and adding subsidized carbon fiber
	Centralized, applying more adhesive