ML102880487
| ML102880487 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 11/23/2009 |
| From: | - No Known Affiliation |
| To: | Office of Information Services |
| References | |
| FOIA/PA-2010-0116 | |
| Download: ML102880487 (2) | |
Text
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3.1 Inadequate Air Content May identify additional perspective on this issue as RCA related efforts proceeds
==
Description:==
Excessive amount of uncontrolled air contained within the concrete as a result of mixing/placing operations could cause voids. These voids of variable size and shape create weakness in the matrix.
Excessive volume of air voids (entrained and entrapped) can weaken the concrete, provide an initiation zone for cracks, and increases potential for shrinkage/creep.
Data to be Collected and Analyzed:
(1)
Petrographic analysis (Exhibits 1 & 2)
(2)
Review pour tickets for measured air during construction (Exhibit 3). Exhibit 4 is a graph of the data from those pours.
/
Verified Refuting Evidence:
- 1.
Amount of entrained air is within acceptable range according to Petrographic analysis.
- 2.
Pour ticket review shows the air entrained admixture (DAREX) was used in all concrete pours in accordance with the design specifications.
- 3.
Analysis of measured air confirmed that air content was within specifications.
Reviewed by: Dr. Avi Mor, 352-795-6486, ext 1030 -
P11 CR3 Team Office Verified Supporting Evidence:
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2.O5 Pour 522 522 528 634 641 641 641 641 666 666 666 666 685 695 700 263 296 326 326 362 535 642 658 658 683 690 690 702 713 719 729 745 745 749 762 769 CR3 -elf 11/22/2009 3:05 PM test data original filled vl.xls