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Design Guidance
Aslan 400 CFRP Laminates for Externally Bonded Strengthening per ACI440.2R-08:

- Increase Flexural or Shear strength of existing Concrete, Masonry or Wood members
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Aslan 400 CFRP Laminates
 

Carbon Fiber Reinforced Polymer Laminates

Carbon Fiber Reinforced Polymer (CFRP)
Laminates

Aslan 400 by Hughes Brothers

Aslan 400 CFRP Laminates are used as externally bonded structural strengthening of concrete, masonry or wood members. The laminate is used in conjunction with an appropriate leveling mortar or putty and structural adhesive system to improve the flexural or shear strength of the member. Design guidelines for the use of Aslan 400 CFRP Laminates are dictated by ACI document 440.2R-08 "Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening of Concrete Structures".

Benefits of Aslan 400 CFRP Laminate

Features of Aslan 400 CFRP Laminate

Aslan 400 is available in two standard widths.
  • 1.4mm X 50mm (.055" X 2")
  • 1.4mm X 100mm (.055" X 4")

Made from 700ksi, 33Msi carbon fiber, approximately 70% by weight in an Epoxy resin matrix. One side of the laminate is sanded to allow for bond of the structural adhesive.

The 3"(75mm) and 4"(100mm) wide versions are furnished in continuous length spools that are 250ft (75m) long. The 2" wide (50mm) version is in 250ft (75m) spools.

Sanding Laminate

Physical Properties

*Tensile strengths shown are the average. The guaranteed tensile strength f*fu, per ACI440, the average minus three standard deviations is 325ksi (2241Mpa).


Tensile Modulus of Elasticity values are the average of a population of test specimens as per ACI440 guidelines.

Aslan 400 CFRP Laminate testing
Extensometer Measuring Tensile Modulus

Installation

After assessment of the existing structure and design by a competent professional, installation of Aslan 400 CFRP Laminates are performed according to the following general outline. Concrete, masonry or wood surfaces must be sound and free of scale, mill or other surface contaminates.

  1. Surface preparation by sand or water blasting is performed to expose course and fine aggregate surfaces . Surface preparation should be in accordance with ACI546R and ICRI 03730
  2. Perform bond pull off tests to evaluate substrate soundness per engineers' guidelines.
  3. Measure evenness or levelness of the prepared surface. An uneven surface will result in premature peeling of the laminate under load. This is measured by placing a straight edge against the prepared surface. Uneven areas should be leveled with an appropriate leveling mortar or putty.
  4. Prior to application of the structural adhesive to the substrate and laminate, appropriate climatic conditions are measured to ensure they are within the tolerances required by the structural adhesive.
  5. Before applying structural adhesive to the CFRP laminate, the sanded side of the laminate is wiped with acetone or other solvent until any excess residue is removed from the carbon plate.
  6. Structural adhesive is applied to both the carbon and substrate surfaces.
  7. The laminate is carefully positioned and pressed in place using a hard rubber roller to achieve a void free bond line thickness between 2 to 3 mm (0.7" to 0.11"). Excess adhesive is then removed from the sides of the Aslan 400 before it can cure.
  8. If specified, the Aslan 400 is coated with an epoxy coating or decorative elastic polymer.
  9. To facilitate quality control inspection, test patches adjacent to the area being strengthened should be prepared simultaneously to each of the above operations. Bond pull-off tests can then be performed to validate proper installation.

Recommended Leveling Mortars:

  • SikaDur 41
  • SikaCem 133 Gunite
  • DeNeef Denepox & quartz sand (50:50 by weight)

Recommended Structural Adhesives:

  • SikaDur 30
  • DeNeef Enforce CFL Gel

Recommended Coatings:

  • SikaGard 62
  • SikaGard 550W Elastic