ML20137H221
| ML20137H221 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 03/11/1980 |
| From: | Williams H TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | |
| Shared Package | |
| ML17198A292 | List:
|
| References | |
| FOIA-85-59 QI-QP-11.0-11, NUDOCS 8512020344 | |
| Download: ML20137H221 (8) | |
Text
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2 k'l INSTRUCTION b'
ISSUE TEXAS UTILITIES GENERATING CO.
NUMBER REVISIDN DATE PAGE CPSES (O
V 21-QP-II.0-Il 3
3-11-80 I of 8 WE C N E
PREPARED BY:
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DATE OPERATIONS 80 APPROVED BY:
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1.0 REFERENCES
1-A Specification 2323-SS-9, " Concrete" 1-B ACI-306, " Recommended Practice for Cold Weather Concreting" HISTORICALFil.E 2.1 PURPOSE AND SCOPE To outline the inspection requirements for cold weather concrete operations and comply with the requirements of Reference 1-A.
2.2 DEFINITION AND DETERMINATION FOR ltH, ORWATION ONLY 2.2.1 Cold Weather Concreting As defined Reference 1-13:
"In the fall, from the time of the fjrst 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 6
3.1.1 Protective Measures The QC Inspector shall verify:
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3-11-80 2 of 8 a.
That arrangements for covering, insulation,' heating or housing the placement are made in advance.
b.
That the protective measures selected will be adequate to maintain the temperature and moeiture content in 2
all parts of the placement.
c.
That adequate fire protection equipment is on hand and i
fire prevent ion measures ars, 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 Inspection of Placement Area The QC Inspector shall verify:
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a.
That there is no ice, snow or frost on the construc-tion joint, rebar, forms or any'tsurf ace in the placement area that will come into contac with fresh concrete..
b.
That the temperature of all surfaces in the placement area to be in contact vitg fresh concrete has been raised to a minimum of 40 F.
3.2 BATCHING AND PLACEMENT 3.2.1 Control of Materials, The QC Inspector shall verify the following a.
Aggregate used in the batching of concrete is free of ice'and frozen lumps.
b.
Aggregate not heated above 150 F.
c.
If either water or aggregate heated above 100 F, both shall come together first in the mixer so that the high temperature of one or the other is reduced be-fore cement is added.
i d.
Cement is not added tg mixtures of aggregate and fj }
water that exceed 100 F.
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INSTRUCTION ISSUE RWISION PAGE NUMBER DATE TEXAS UTILITIES GENERATING CO.
lh CPSES OI-OP-ll.0 -
3 3-11-80 3 of 8 3.2.2 Placement Temperature The QC Inspector shall verify that concrete is'not placed at a temperature lower than:
Sections Lesg Than 2'-6" Sections Greatgr Than 2'-6" 55 F 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 immedi-ately following placement and continued throughout the duration of curing.
a.
Ponding or continuous sprinkling.
IO b.
Absorbent mats or fabric kept continuously wet.
c.
Sand kept continuously wet.
d.
Steam not exceeding 150 F or mist spray, not to be used on sections greater than 2'-6".
Application of waterproof sheet material.
Must be e.
in full contact with concrete surfaces and free of rips, tears or holes.
Material must conform to ASTM C171.
f.
Curing compound applied immediately after any water sheens have disappeared from concrete surface.
Can-not be used on construction joints without specific approval of the Engineer.
3.3.2 Hoisture Preservation for Surfaces in Contact with Forms a.
For surfaces in contact with metal or coated wood forms, no moisture addition or retention methods are required.
b.
If forms are removed during the curing period, the
((g QC Inspector shall verify that one of the methods in Paragraph 3.3.1 is employed.
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INSTRUCTION ISSUE
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I REVISION PAGE NUM8ER DATE I
TEXAS UTILITIES GENERATING CO.
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3-11-80 4 of 8 1'
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The QC Inspector shall verify that concrete surfaces j
are maintained in a mosit condition during form removal, j
3.3.3 channes in curina Methods I
Any curing method described in Paragraph 3.1.1 when used initially may be replaced by any one of the other methods 1
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 i
concrete is not permitted to become surface dry during the j
transition.
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3.3.4 R e q u i rein e n t s of the Concrete Surface Tem p e ra t u r e s ___
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Whgn the mean daily outdoor temperature is less than a.
j 40 F, the temperagure of tge concrete shall be main-j tained between 50 F and 70 F for the required curing
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period.
l b.
On the containmenti exterior wall the concrete surface
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temperature must be maintained above 40 F for a mini-num of 7 days after placing, and maintained above j
freezing for the remainder of the 14 day curing period.
c..
For sections 2 '-6" thick or less," the temperature of
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the air adjacent to the concrete, during and'immediately l
following the curing period,*shall be held cgnatant if l
possible, and ghall not exceed a change of 5 F in any l
one hour or 50 F in any 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period.
d.
For found0 tion mats in excess of 2'-6" and the contain-4 ment exterior wall, the temperature of the air adjacent to the concrete, during and immediately following the l
curing period, shall be held egnstant if possible, and shall not exceed a change of 3 F in any one hour or 30,F i
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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3.3.5 QC Inspection for Maintenance of Temperature Reeutrements 4
i To assure maintenance of temperature requirements, the QC i
j Inspector shall verify that:
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Prior arrangements in Paragraph 3.1.2 are fully imple-i l
mented.
l b.
gdges and corners of placements which are vulnerable to i
freezing are fully protected.
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c.
Combustion heaters emitting exhaust gases which contain i
carbon 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 i
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INSTRUCTION ISSUE REVISION PAGE NUMBER
'DATE TEXAS UTILITIES GENERATING CO.
CPSES OI-OP-11.0-1:
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curing unless the concrete surface is protected from
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exposure to the gases.
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d.
Surface temperatures are taken at several points on the j
placement to represent highest and lowest temperatures.
t, e.
Heaters are not positioned in a manner that will cause
~ excess heat at localized points on the placement.
f.
At the end of the curing period, concrete in a saturated condition is not exposed to freezing temperatures.
g.
At t h'e end of the curing period, the drop in temperatuge i
throughout the first 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period does ngt exceed 50 F for concrete sections 2'-6" or less and 30 F for sections greater than 2'-6".
i h.
If at any time during the curing period concrete ten-i peratures are allowed to' drop'below minimum requirements,
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~the curing is extended for the length of time that the temperature was allowed to remain below the minimum re-(O quirements.
3.3.6 Duration of Curing i
a.
Containment exterior walls and foundat' ion sats in excess j
of 2'-6" shall be cured in a manner which will contain moisture in the concrete for 14 gays.
Surface t em p e r.a-ture must be maintained above 40 F for 7 days and freez-ing for the remaining 14 days.
b.
All concrete placements shall be cured for a minimum of j
7 days and the method employed shall maintain moisture within the concrete for that period of time.
I 3.4 PROTECTION FROM MECHANICAL INJURY l
The'QC Inspector shall verify that'during the curing period, the concrete is protected from and.is not subjected to j
damaging mechanical disturbances, such as load stresses, j
heavy shock, and excessive vibration.
He sha11'also verify that all finished concrete surfaces are protected and do l
not receive damage from construction equipment, materials I
or methods, by application of curing procedures, and by rain or running water.
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Il6TRUCTION l
REVISwd ISSUE PAGE
'IEXAS UTILITIES GE2ERATING CO.
IRBER CPSES QI-QP-11.0-11 3
3 ;;_gg 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 Doct.HENTATION 3.6.1 Verification of Daily Inspection Activities a.
The QC Inspector shall verify daily cold weather concrete 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 The QC Inspector shall monitor concrete surface temperatures a.
b of each placement in cure as frequently as possible during his shift, 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 freezing when severe conditions threaten without waiting for additional instructions.
The QC Inspector shall record the day, dates ambient temperature c.
from tho 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 filing in accordance with CPSES requirements for "QA Records".
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