Petrographic Analysis of Concrete Deterioration
Matthew Stuart, P.E., S.E., F.ASCE
A. Introduction to the Investigation of Concrete Deterioration.
1. On-Site Condition Evaluation Survey.
2. Laboratory Petrographic Analysis.
3. Determination of Extent of Damage and Remaining Service Life.
4. Assessment of Repair Materials and Coatings Application.
5. Assessment of Cathodic Protection Systems.
B. Petrographic Analysis.
C. Concrete Pathology.
1. Concrete deterioration which is not directly influenced by reinforcement corrosion:
a. Leaching Attack.
b. Deterioration due to Magnesia or Lime Grains.
c. Deterioration due to Pyrites in the Aggregates.
d. Alkali Reactions.
e. Deterioration due to Environmental Exposure
Deterioration in Sulfate Environments
f. Delayed Ettringite Formation.
g. Deterioration due to Chemical Exposure.
2. Concrete deterioration influenced by reinforcement corrosion:
a. Chloride Attack.
D. Examples of Deterioration that can be Established by Petrographic Analysis.
1. Acid Attack.
2. External Sulfate Attack.
3. Delayed Ettringite Formation.
4. Alkali Silica Reactions in Concrete.
5. Carbonation of Concrete.
6. Freeze Thaw Deterioration of Concrete.
This course includes
a multiple choice quiz at the end, which
is designed to enhance the understanding of the course materials.
which is designed to enhance the understanding of the course materials.
At the conclusion of this course, the student will be able to:
course is intended for engineers (structural, forensic and process) and architects.
Benefit to Attendees
This course will enable a design professional to understand the importance of using petrographic analysis in both the determination of the cause and proper repair of deteriorated concrete.
Petrographic analysis is a key component of the investigation of an existing deteriorated concrete structure. Petrographic analysis can be used to determine chemical and physical irregularities in concrete including the nature of the chemical attack, identification of reactive aggregate, strength, mixture proportion estimates (such as water/cement ratio), cement and fly-ash content, corrosion potential of embedded steel, degree of carbonation, aggregate size and distribution, presence of alkali-aggregate or sulfate reaction. This type of information can aid in the determination of the root cause of failure and extent of cracking, dusting, scaling, coating delamination and other types of concrete deterioration.
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is a key component of the investigation of an existing deteriorated concrete
structure. Petrographic analysis can be used to determine both chemical and
physical irregularities in concrete and should be used in conjunction with an
on-site condition survey. The information obtained from a petrographic analysis
can aid in both the determination of the root cause of failure or deterioration
of the concrete and enable the proper assessment of the potential rehabilitation
techniques and materials required to both repair the existing structure as well
as mitigate further corrosion and deterioration of the concrete.
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