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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


CFRP strengthening


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


ItemStandard of qualificationTest methodRegion
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 fabric: ＜2mm

  • 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


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