1.5—Format and organization
Chapter 2 discusses removal of deteriorated concrete,
preparation of surfaces to receive repair materials, general
methods for concrete repair, and repair techniques for
reinforcing and prestressing steel. Chapter 3 discusses
various types of repair materials that may be used. The
reader is urged to use Chapters 2 and 3 in combination
when selecting the repair material and method for a given
situation. Chapter 4 describes materials and systems that
may be used to protect repaired or unrepaired concrete
from deterioration. Chapter 5 provides methods for
strengthening an existing structure when repairing deficiencies,
improving load-carrying capabilities, or both. Chapter 6
provides references, including other appropriate ACI
documents and industry resources.
CHAPTER 2—CONCRETE REMOVAL,
PREPARATION, AND REPAIR TECHNIQUES
2.1—Introduction and general considerations
This chapter covers removal, excavation, or demolition of
existing deteriorated concrete, preparation of the concrete
surface to receive new material, preparation and repair of
reinforcement, methods for anchoring repair materials to the
existing concrete, and various methods that are available to
place repair materials. The care that is exercised during the
removal and preparation phases of a repair project can be the
most important factor in determining the longevity of the
repair, regardless of the material or technique used.
Specific attention should be given to the removal of
concrete around prestress strands, both bonded and
unbonded. The high-energy-impact tools, such as chipping
hammers, should avoid contact with the strand because this
will reduce the strands’ load-carrying capacity and may
cause the wire(s) to rupture, which may lead to strand failure.
2.2—Concrete removal
A repair project usually involves removal of deteriorated,
damaged, or defective concrete. In most concrete repair
projects, the zones of damaged concrete are not well defined.
Most references state that all damaged or deteriorated material
should be removed, but it is not always easy to determine
when all such material has been removed or when too much
good material has been removed. A common recommendation
is to remove sound concrete for a defined distance beyond
the delaminated area; thereby, exposing the reinforcing steel
beyond the point of corroded steel.
1.5—Format and organizationChapter 2 discusses removal of deteriorated concrete,preparation of surfaces to receive repair materials, generalmethods for concrete repair, and repair techniques forreinforcing and prestressing steel. Chapter 3 discussesvarious types of repair materials that may be used. Thereader is urged to use Chapters 2 and 3 in combinationwhen selecting the repair material and method for a givensituation. Chapter 4 describes materials and systems thatmay be used to protect repaired or unrepaired concretefrom deterioration. Chapter 5 provides methods forstrengthening an existing structure when repairing deficiencies,improving load-carrying capabilities, or both. Chapter 6provides references, including other appropriate ACIdocuments and industry resources.CHAPTER 2—CONCRETE REMOVAL,PREPARATION, AND REPAIR TECHNIQUES2.1—Introduction and general considerationsThis chapter covers removal, excavation, or demolition ofexisting deteriorated concrete, preparation of the concretesurface to receive new material, preparation and repair ofreinforcement, methods for anchoring repair materials to theexisting concrete, and various methods that are available toplace repair materials. The care that is exercised during theremoval and preparation phases of a repair project can be themost important factor in determining the longevity of therepair, regardless of the material or technique used.Specific attention should be given to the removal of
concrete around prestress strands, both bonded and
unbonded. The high-energy-impact tools, such as chipping
hammers, should avoid contact with the strand because this
will reduce the strands’ load-carrying capacity and may
cause the wire(s) to rupture, which may lead to strand failure.
2.2—Concrete removal
A repair project usually involves removal of deteriorated,
damaged, or defective concrete. In most concrete repair
projects, the zones of damaged concrete are not well defined.
Most references state that all damaged or deteriorated material
should be removed, but it is not always easy to determine
when all such material has been removed or when too much
good material has been removed. A common recommendation
is to remove sound concrete for a defined distance beyond
the delaminated area; thereby, exposing the reinforcing steel
beyond the point of corroded steel.
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