Specifications for Repair of Concrete in Buildings-Specifications for Repair of Concrete in Buildings—Brand New, Section 3 Concrete Removal and Preparation of Repair (PDF)

Specifications for Repair of Concrete in Buildings—Brand New, Section 3 Concrete Removal and Preparation of Repair (PDF)

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Pdf Summary

The document, "ACI 563 Specifications for Repair of Concrete in Buildings, Section 3: Concrete Removal and Preparation for Repair," outlines essential procedures for ensuring durable concrete repairs and maintaining structural integrity. This section emphasizes the significance of meticulous concrete removal and surface preparation, as improper execution can lead to repair failure, added costs, further repairs, and compromised structural integrity.

Key topics covered include:

1. <strong>General Requirements</strong>: This involves providing all necessary resources - labor, materials, tools, and supervision - for concrete removal and surface preparation, as outlined in the contract documents.

2. <strong>Equipment and Methods</strong>: Specific guidelines are offered for selecting suitable equipment that minimizes damage to the structure, removes laitance and debris, achieves required surface profiles, and adheres to environmental and safety standards.

3. <strong>Execution</strong>:
   - <strong>Identification of Removal Extent</strong>: Involves visual inspections and soundings to identify areas requiring concrete removal.
   - <strong>Concrete Removal</strong>: Requires careful handling to avoid damaging reinforcement bars, using suitable equipment, and ensuring depth and profile compliance.
   - <strong>Substrate Preparation</strong>: After concrete removal, the substrate must be cleaned of all bond-inhibiting materials and prepared to meet specific surface profiles.

4. <strong>Surface Verification and Quality Assurance</strong>: Includes verification of prepared surfaces before repair material application, possibly requiring tensile pull-off tests to ensure adequate bond strength.

5. <strong>References and Guidelines</strong>: Several industry references (e.g., ICRI, ACI, SSPC) provide standards for minimizing microcracking and specifying surface preparation.

With thorough adherence to these specifications, professionals can achieve effective, durable repairs. For further guidance or inquiries, contact Ken Lozen, ICRI Technical Director at kenl@icri.org.

Keywords

concrete repair

structural integrity

surface preparation

equipment guidelines

removal extent

substrate cleaning

quality assurance

industry standards

durable repairs

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