ML12157A315
| ML12157A315 | |
| Person / Time | |
|---|---|
| Issue date: | 06/05/2012 |
| From: | Office of the Chief Human Capital Officer |
| To: | |
| References | |
| Download: ML12157A315 (55) | |
Text
Concrette Tech C hnolog gy and Codes s
The Petrographic Report
Petrographic Examination What is it?
How is it done?
What can it do?
What cant it do?
What will the petrographic report say?
How do I critically read a petrographic report?
Structural Evaluation LARGE scale to sma ll scale
Structural Evaluation ACI 364.1R Guide Guide for Evaluation of Concrete Structures Prior to Rehabilitation ACI 349.3 Evaluation of Existingg Nuclear Safety-Related Concrete Structures
- document review d i
- field inspection
- sampling
- condition survey
- material testing (laboratory)
Structural Evaluation ACI 364.1 Table 6.1(a)
Evaluation of Properties of Concrete
Structural Evaluation ACI 364.1 Table 6.1(b)
Evaluation of Physical Conditions of Concrete
Structural Evaluation Importance of Appropriate Samples
Petrography Defined as the systematic description and classification of rocks (or concrete),
especially through microscopical examination Methods and techniques for concrete petrography derived from geology, metallurgy, and ceramics
Petrographic Examination ASTM C 856-04 856 04 - Standard Practice for Petrographic Examination of Hardened Concrete Guideline for microscopical analysis of concrete and related materials M h d and Methods d techniques h i may vary with i h scope of investigation
Petrographic Examination Examine sample as-received as received
Petrographic Examination Select areas for sub sub-sampling sampling
Petrographic Examination Lapped surface
Petrographic Examination Stereomicroscope
Petrographic Examination Fresh fracture
Petrographic Examination Thin section
Petrographic Examination Polarized light (petrographic) microscope
Petrographic Examination Powder mount
Petrographic Examination CAN Describe the general composition, quality, and condition of the concrete and its constituents
Petrographic Examination CAN Estimate air content and adequacy of air-air void system
Petrographic Examination CAN Identify supplementary cementing materials
Petrographic Examination CAN Determine general compliance with mix design (aggregates, air content, SCMs, w/c)
Petrographic Examination CAN Determine depth of paste carbonation
Petrographic Examination CAN Evaluate workmanship (consolidation, finishing, curing)
Petrographic Examination CAN Evaluate possible causes of distress
Petrographic Examination CAN Recommend additional tests to investigate the problem Air void system analysis (ASTM C457)
Scanning electron microscopy (SEM-EDX)
Cement content analysis (ASTM C1084)
Compressive strength testing (ASTM C42)
X-ray diffraction X-ray X ray fluorescence Chemical tests
Petrographic Examination CANT Determine cement content Determine cement type Confirm presence presence, type type, or quantity of chemical admixtures Determine timing of water additions Determine precise proportions of mix Determine concrete strength
Petrographic Report Background information/ reason for testing Conclusions Summary of observations Discussion Methodology of examination Photographs D t pages Data
Evaluating a Report Were samples representative?
Do observations/data agree and seem p
plausible?
Do photographs illustrate observations?
Do conclusions drawn from observations seem logical?
Is original question addressed?
NEVER BE AFRAID TO QUESTION THE PETROGRAPHER!