ML20137H245
| ML20137H245 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 07/05/1979 |
| From: | TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | |
| Shared Package | |
| ML17198A292 | List:
|
| References | |
| FOIA-85-59 QI-QP-11.0-11, NUDOCS 8512020349 | |
| Download: ML20137H245 (9) | |
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Q TEXAS UTILITIES GENERATING CO.
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REVISION E
PAGE
'CPSES QI-QP-ll.0-11 1
7-5-79 1 of 8 INSPECTION OF COLD WEATHER PREPARED BY:
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CONCRETE OPERATIONS DATE 7 5[77 APPROVED
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1.0 REFERENCES
1-A Specification 2323-SS-9, " Concrete" l-B ACI-306, "Reco mended Practice for Cold Weather Concreting" s
2.1 P.URPOSE AND SC
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To outline the inspection requirecents for cold weather con-crete operations and comply with the requirements-of Reference 1-A.
-2.2 DEFINITION AND DETERMINATION FOR 1' r0RMA.,,DN ONJ7 2.2.1 Cold Weather Concreting As defined Reference 1-13: "In the fall, from the time of the first frost until the mean daily temperature falls below 40 F for more than 1 day in a row....
2.2.2 Determination The determination that cold weather concreting principles are applicable will be made by the Civil Inspection Supervisor /
designee.
3.0 INSTRUCTION 3.1 PREPLACEMENT INSPECTION ACTIVITIES 3.1.1 Protective Measures
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The QC Inspector shall verify:
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hat arrangements for covering, insulation, heating or r.0; sing the placcment are made in advance.
b.
That the protective measures selected will be adequate to 1
caintain the temperature and moisture content in all parb of the placement.
I c.
That adequate fire protection equipment is on hand and fire prevention measures are enforced.
3.1.2 Curing Consideration Before Placement The QC Inspector shall verify that arrangements are made before placement to maintain the fresh concrete in a moist condition at the required temperatures throughout the curing period.
3.1.3 Ins:ection Of Placement Area f
The QC Inspector shall verify:
s a.
Tha.t there is no ice, snow or frost on the construction joint, rebar, forms or any surface i'n the placement area sr7 that will ccme into contact with fresh concrete.
A' b.
That the temperature of all surfaces in the placement area to be ir. contact with fresh concrete has been raised to a mini-mun of 400 F.
3.2 BAT ~":UG AND PLACEMENT 3.2.1 Co. trol Of Materials The QC Inspector shall verify the following:
a.
Aggregate used in the batching of concrete is free of ice and frozen lumps.
0 b.
Agyegate not heated above 150 F.
c.
If either water or aggregate heated above 1000F, both shall i
ccT.e together first in the mixer so that the high temperature of one or the other is reduced before cement is added.
d.
Cement is not added to mixtures of aggregate and water that exceed 1000F.
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3.2.2 Placecent Te. oerature The QC Inspector shall verify that concrete is not placed at a a temperature lower than:
Sections Less Than 2'-6."
Sections Greater Than 2'-6" 550F 0
50 F 3.3 CURING 3.3.1 Moisture Preservation For Surfaces Not In Contact With Forms The QC Inspector shall verify that one of the following methods for moisture preservation is implemented immediately following placement and continued throughout the duration of curing:
Ponding or continuous sprinkling.
(s a.
I b.
Absorbent cats or fabric kept continuously wet.
Sand kept continuously wet.
c.
l d.
Steam not exceeding 1500F or mist spray, not to be used on sections greater than 2'-6".
i Aoplication of waterproof sheet material. Must be in full e.
contact with concrete surfaces and free of rips, tears or hole's.
- taterial must conform to ASTM C171.
l f.
Curing compound applied immediately after any water sheens have disappeared from concrete surface.
Cannot be used on construction joints without specific approval of the Engineer. '
Moisture Preservation For Surfaces In Contact With Forms 3.3.2 For surfaces in contact with metal or coated wood forms, no a.
reisture addition or retention methods are required.
b.
If forms are removed during the curing period, the QC In-pector shall verify that one of the methods in Paragraph 3.3.1 is employed.
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Tne QC Inspector shall verify that coricrete surfaces are c.
maintained in a moist condition due ing form removal, l
,3.3 Changes In Curing Methods Any curing method described in Paragraph 3.1.1 when used initially may be replaced by any one of the other methods at any time 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 concrete is not permitted' to become surface dry during the transition.
3.3.4 Concrete Surface Temperature Requirements The concrete surface temperature shall be maintained between a.
500F and 700F'throughout the curing period, except b.
On the containment extgrior wall the surface temperature must be maintained above 40 F for a minimum of 7 days after placing, and maintained above freezing for the remainder of the 14 day 1
curing period.
.1.5 Recuirements Of Air Temperature Adjacent To The Concrete For sections 2'-6" thick or less, the temperature of the a.
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air adjacent to the concrete, during and immediately follow-ir.g the curirig period, shall be held coilstant if possible, cr.d shall r.ot exceed a change of 50F in any one hour or 500F in any 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period.
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b.
For foundation mats in excess of 2'-6" and the containmen't exterior uall, the temperature of the air adjacent to the concrete, during and immediate,1y following the curing period, shall be held constant if possible, and shall not exceed a.
change of 30F in any o e hour or 300F in any 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period.
i 3.3.6 QC Inscection For Maintenance Of Temperature Requirements To assure maintenance of temperature requirements, the QC In-spector shall verify that:
Prior arrangements in Paragraph 3.1.2 are fully implemented.
a.
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Edges and corners of placements which are vulnerable to freez-
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ing are fuliy protected, Combustion heaters emitting exhaust gases which contain carbon c.
dioxide are not used during the first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of curing unless the concrete surface is protected from exposure to the gases.
d.
SurfacetemperaturesaretakenatseveralpointsontheplacA-ment to represent highest a' nd lowest temperatures.
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Heaters.are not positioned in a manner that will cause excess"_
e.
heat at localized points on the placement.
f.
At the end of the curing period, concrete in a saturated con-dition is not exposed to freezing temperatures.
out the first 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period does not exceed 500At g.
u F for concrete sections 2'-6" or less and 300F for sections greater than 2'-6".
h.
If at any time during the curing period concrete temperatures O
are allowed to drop below minimum requirerhents, the curing is ex t[V ter.ded for the length of time that.the temperature was allowed to remain bel,ow the minimum requirements.
3.3.7 D;ratier. of Curing Containment exterior calls and foundation mats 'in exces a.
2'-6" shall be cured in a manner which will contain mo theconcretefog14 days. Surface temperaturs must be main-tained above 40 F for 7 days and freezing for the remaining j
14 days.
b.
All concrete placements shall be cured for a minimum of 7 days I
and the method employed shall maintain moisture within the oncrete for that period of time.
3.4 PROTECTIOil FROM NECHANICAL INJURY i
l T. e QC Inspector shall verify that during the curing period, the c:ncrete is protected from and is not subjected to vibration.
He shall also verify that all finished concrete surfaces riterials or methods, by application of curing proc rein or running water.
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IRIBER ISSUE PAGE CPSES QI-QP-11.0-11 1
7-5-79 6 of 8 3.5 FIELD CURED CYLINDERS The QC Inspector shall verify that field cured cylinders are placed in or on the structure as near to the point of use as practicable, the same protection from the elements on all surfaces as is given to the placement they represent.
3.6 DOCUME;;TATION 3.6.1 Verification of Daily Inspection Activities The QC Inspector shall verify daily cold weather concrete a.
inspection activities by initialing and dating the Daily Curing Verification Report (Figure 1).
b.
At the end of the required curing period, the QC Inspector shall sign the Daily Curing Verification Report and submit it to the QC Documentation Supervisor.
3.6.2 Monitor of Concrete Surface Temperature During Cold Weather Curing rN a.
b The QC Inspector shall monitor concrete surface temperatures of each placement in cure as frequently as possible during his shif t, using a surface type dial thermometer insulated from the surrounding air.
b.
The minimum frequency for monitoring concrete surface temp-eratures will be a least once each half of the QC Inspectors shift for each placement in cure. This frequency will be.
increased at the direction of the Civil QC Supervisor / Designee when abrupt weather changes occur. However, the QC Inspector should use his own judgement to monitor, the surface temperature of fresh concrete as often'as necessary to protect it from free:ing when severe conditions threaten without waiting for additional instructions.
The QC Inspector shall record the day, date; ambient temperature c.
from the site recording thermometer, weather conditions and' con ~
crete surface temperatures on the Curing Report Pour Temperature Record (Figure 2).
d.
At the end of the required curing period, the QC Inspector shall submit completed Figure 2 to the Civil Inspection Supervisor /
Designee for review, processing and f.iling in accordance with CPSES requirements for "QA Records".'
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NAME OF DATE PREVIOUS REVISION DOCUMENT HOLDER ISSUED RETURNED / DESTROYED
- I-001 R.G.
TOLSON
- I-002 R.B.
FLECK
- I-003 FLECK (RON'MEISSNER'
- I-004 FLECK (BUDDY LAMB)
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- 1-005 FtECr (ROBINSON)
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