Reparación de descascaramientos en superficieshorizontales de concreto (RAP 7S)-Reparación de descascaramientos en superficieshorizontales de concreto (RAP 7S) (PDF)

Reparación de descascaramientos en superficieshorizontales de concreto (RAP 7S) (PDF)

Pdf Summary

The "Boletín 7 de RAP del ACI" is a comprehensive guide for repairing delamination on horizontal concrete surfaces, prepared by ACI Committee E706 and reapproved in 2010. It serves as a practical guide for owners, design professionals, and contractors involved in concrete structure repairs, providing detailed procedures while emphasizing that users must assess specific conditions, evaluate structural integrity, and ensure compliance with health and safety regulations.<br /><br />The document outlines a step-by-step guide for surface preparation and repair, addressing common causes of deterioration, such as corrosion of embedded reinforcement, freeze-thaw cycles, and chemical attacks. It advocates for a systematic approach starting with evaluating the extent of damage, marking and cutting the repair area, removing defective concrete, and cleaning exposed reinforcement to facilitate repair material adhesion.<br /><br />Preparation involves several steps:<br />1. Identifying delamination through ASTM D4580-03 standards.<br />2. Marking repair perimeters with simple geometric shapes.<br />3. Saw-cutting to avoid reinforcement damage.<br />4. Removing deteriorated concrete while being cautious around the reinforcement.<br />5. Cleaning reinforcement and surfaces using high-pressure water or abrasive blasting.<br /><br />For the placement of repair materials, it recommends pre-wetting surfaces, optional use of bonding agents, and proper consolidation to ensure adhesion. Material selection should align with specified properties, aiming for greater compressive strength than the original concrete and a water-cementitious materials ratio no higher than 0.40. Safety considerations stress eye, ear, respiratory, and skin protection, highlighting the importance of adhering to OSHA standards.<br /><br />The guide encourages a pre-construction meeting for thorough planning and outlines verification methods like visual inspection and pull-off testing to assess adhesion strength. It refers to multiple ACI guidelines for detailed procedural understanding, underscoring the essential role of structured planning and skilled execution in ensuring effective concrete repairs.

Keywords

concrete repair

delamination

ACI Committee E706

surface preparation

structural integrity

corrosion

freeze-thaw cycles

ASTM D4580-03

bonding agents

OSHA standards