Ace Restoration and Waterproofing Incorporated ACE Restoration & Waterproofing Incorporated
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Recent Projects

Featured Projects

Naval Air Station

shim_trans
shim_trans  Summery
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shim_trans  Objective
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shim_trans  Project Background
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shim_trans  Scope of Work
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shim_trans  Bravo 25 Description
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shim_trans  Overview
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shim_trans  Crane Rail Removal
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shim_trans  Loss of Transverse
 Negative Moment
 Capacity over the
 Outboard Crane Rail
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shim_trans  Concrete Repair
 Materials
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shim_trans  Top Deck
 Repair Procedure
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shim_trans  Under Deck Repairs
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shim_trans  Cathodic Protection
 System
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shim_trans  Cathodic Protection
 System Installation
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shim_trans  Grout Resistivity
 Measurements
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shim_trans  Reinforcing Steel
 Lead Wire Installation
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shim_trans  Upgrade Reinforcement
 Introduction
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shim_trans  Analysis of Bravo-25
 Load Response
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shim_trans  Calculation of
 Bravo 25 Resistence
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shim_trans  Modes of Failure
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shim_trans  Bravo 25
 Upgrade Design
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arrow_right  Concrete Surface
 Preparation
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shim_trans  Embedded
 Reinforcement
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shim_trans  Wet Lay-up
 Composite Laminate
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shim_trans  Proof Tests using
 Impact Load Method
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shim_trans  Costs
 Acknowledgements
 References
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Turbine Deck Load Capacity Restored


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Home > Featured Project > Pearl Harbor

Featured Project

 

Concrete Surface Preparation

The Navy considers concrete surface preparation and treatment to be critical to ensure adequate bond between the substrate and the external reinforcement. Included in the surface preparation is the application of a primer that penetrates and seals the concrete. Penetration of the primer is significant because it enhances the tensile strength of the concrete while it prevents laminate deterioration at the concrete interface due to moisture migration from the concrete. NFESC pull-off tests showed the primer significantly increases the tensile and impact strength of the first 1/8-inch (3 mm) layer of concrete that is porous and microcracked (Reference 3).

 

Concrete surface preparation after repair generally took the course directed by manufacturer’s recommendations. In case of a conflict between the Navy’s specifications and manufacturer’s literature and guidelines, the Navy’s specifications took precedence. Surface preparation procedures required the application of an epoxy penetrant/sealer/primer with a maximum viscosity of 100 centipoise.

 

The ideal concrete surface for applying external laminate reinforcing is clean, dry, planar and abraded to roughness equivalent to a concrete surface profile (CSP) 3 as defined by the International Concrete Repair Institute (Reference 4). Form marks and surface discontinuities were ground or knocked down with a small, compressed-air-driven hammer or pneumatic grinder. The latter was also useful for feathering voids and other small anomalies in the concrete surface. After removing all the form marks and high points, the surface was abraded. Abrading removes cement laitance from the surface and exposes the aggregate for bonding with the epoxy matrix. The preferred method of abrading the surface employed by the contractor is shot blasting wherein all the shot is recovered with the removed material. Methods that bruise the concrete (cause cracking in the concrete surface) were not allowed.

 

Protruding tie wires, reinforcing chairs, paint, and rust stains were removed. Surface indentations such as “bug holes” that remained after grinding were filled and smoothed with shrink-resistant polymer grout. Indentations in the bonding surface negate the laminate bonding making it susceptible to peeling. Therefore, concave surface areas were not allowed.

 

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ACE Restoration & Waterproofing, Inc.
620 E. Walnut Ave.
Fullerton, CA 92831
714.526.7366
Fax: 714.526.7965

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  ACE Restoration and Waterproofing Quick Service Overview:
  Concrete repair; concrete restoration, structural upgrade, epoxy injection,
  waterproofing, and more concrete technologies in Fullerton California (CA)
  by ACE Restoration and Waterproofing.

  Concrete Repair, Concrete Restoration, Epoxy Injection, Waterproofing

http://www.acerestoration.net/

 

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