ML20137G433
| ML20137G433 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 07/12/1978 |
| From: | James Smith TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | |
| Shared Package | |
| ML17198A292 | List:
|
| References | |
| FOIA-85-59 QI-QP-11.0-4, NUDOCS 8512020193 | |
| Download: ML20137G433 (4) | |
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REVISI 4 7EXAS UTILITIES G T
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QI-QP-11.0-4 0
7-12-78 1 of 4 V
SUMMER PREPARED BY:
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R 7- //- 76 DATE CURING
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INSPECTION APPROVED BY: M CMb 7M/7R V
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1-A Specification 2323-SS-9, " Concrete" 2.0 CENERAL
- 4. b 2.1 PURPOSE AND SCOPE 4
To out.line the inspection req cm fo sumer curing of all safety related concrete placem "ts.
3.
AB E CURIN 3.1.1 Surfaces Not in Contact With Forms For surfaces not in contact with forms, verify that one of the.
following methods is put into effect immediately af ter placement:
Ponding or continuous sprinkling.
a.
b.
Absorbent mets kept continually wet.
c.
Sand kept continuously wet.
0 d.
Continuous steam (not exceeding 150 F) or spray mist.
e.
Waterproof sh-et material.
f.
Curing compound if apptoved by Engineer.
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REVISION' PAGE CPSES QI-QPt11.0-4 0
7-12-78 2 of 4 3.1.2 Surfaces in Contact With Forms Il Metal forms in contact with concrete surface are acceptable a.
j for moist curing.
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b.
Wood forms in contact with concrete surface are not acceptable j
for moist curing.
3.1.3 Change in Curing Methods j
Any acceptable curing method may be replaced by one of the 1
others after the concrete is 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> old, provided the con-I crete is not allowed to become surface dry during the transition.
3.2 CURING INS?ECTION REQUIREMENTS j
3.2.1 Containment Exterior Walls and Foundation Mats in Excess of 2'6" i
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Verify that concrete surfaces are protected from premature a.
drying.
b.
Verify that construction joints are kept continuously wet.
c.
The method of curing employed must contain moisture within the concrete for 14 days.
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d.
Verify that forms and exposed surfaces are kept wet for the j
first 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after placing and any time during the curing period when the ambient temperature is above 900F, 1
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3.2.2 Other Placements Requiring Seven Day Minimum Cure Concrete surfaces must be protected from premature drying.
a.
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b.
Construction joints must be kept continuously wet.
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c.
The method of curing employed must maintain moisture within the concrete for 7 days.
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d.
The rate of air temperature change immediately adjacent to
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the concrete must not exceed 50F in any one hour or 500F in any 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
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INSTRUCTION
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BISIM-ISSUE PAGE gtgggq DATE CPSES QI-QP-11.0-4 0
7-12-78 3 of 4 3.2.3 Field Cured Cylinders Verify that field cured cylinders are placed in or on the struc-ture as near to the point of use as possible, and receive the same protection and curing as the placement they represent.
3.2.4 Surface Temperature Requirements There are no specific temperature limits, and no concrete sur-face temperatures will be taken.
3.2.5 Protection f rom Mechanical Injury a..
During the curing period, verify that concrete is not subjected to load stresses, heavy shock and excessive vibration.
b.
Verify that finished surfaces receive adequate protection from caterials and equipment, mV 3.3 DOCINDTATION METHODS 3.3.1 Daily Inspection' Verification The QC Inspector will verify daily curing inspection by initialing and dating Figure 1.
At the end of the required curing period, he will sign this form and submit it to the QC Documentation Supervisor.
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REVISION PAGE N
O CPSES V
QI-QP-11.0 4 0
7-12-78 4 of 4 Figure 1 DAILY CURING VERIFICATION CPSES JOB NO.: 35 1195 UNIT PAGE OF EIIENDED CURING WEN A?PLICABLE DAY 1
2 3
4 5
6 7
8 9
10 11 12 13 14 INITIALS 07 l
INSPECTOR 3-
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NOTE: '; hen curing ec= pound is used, integrity of application is maintained during curing period. Check by wetting surface with water, if the O
water forms into droplets or beads, the curing film is adequate.
CC E iTS:
DATE QC INSPECTOR O
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