ML20137H233
| ML20137H233 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 03/05/1980 |
| From: | Williams H TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | |
| Shared Package | |
| ML17198A292 | List:
|
| References | |
| FOIA-85-59 QI-QP-11.0-11, NUDOCS 8512020346 | |
| Download: ML20137H233 (8) | |
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I INSTRUCTION ISSUE i
IEXAS UTILITIES GENERATING CO.
NUMBER REVISION DATE PAGE f
CPSES w)
QI-QP-11.0-11 2
3-5-80 1 ofa l
INSPECTION OF COLD
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WEATHER CONCRETE PREPARED BY:
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DATE APPROVED BY:
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DATE f
1.0 REFERENCES
1-A Specification 2323-SS-9, " Concrete" 1-B ACI-306, " Recommended Practice for Cold Weathe oncreting" h.
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2.1 PURPOSE AND SC I,
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To outline the inspection requirements for cold weather concrete operations and comply with,the requirements of Reference 1-A.
2.2 DEFINITION AND DETERMINATION 2.2.1 Cold Weather Concreting As defined Reference 1-13:
"In the fall, from the time of the first frost until the agan 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 ACTIVITI::::
3.3.1 Protective Hessures The QC Inspector shall verify:
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i INSTRUCTION ISSUE R
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- Ol NUMBER DATE TEXAS UTILITIES GENERATING CO.
.i CPSES QI-QP-11.0-11 2
3,c-80 2 of 8 1
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a.
That arrangements for covering, insulation, heating i
or housing the placement are made in advance.
b.
That the protective measures selected will be adequate l
to maintain the temperature and mositure content in all parts of the placement.
c.
That adequate fire protection equipment is on hand and fire prevent ion measures are enforced.
i 3.1.2 Curine Consideration Before Placement i
j The QC Inspector shall verify that arrangements are made t
before placement to maintain the fresh concrete in a j
moist condition at the required temperatures throughout i
the curing period.
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3.1.3 Inspection of Placement Area The QC Inspector shall verify:
4 a.
That there is no ice, snow or frost on the construc-l tion joint, rebar, forms or any, surf ace in the placement l
area that will come into contact with fresh concrete.
b.
That the temperature of all surfaces in the placement area to be in contact witg fresh concrete has been i
raised to a minimum o f 40 F.
1 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 l
shall come together first in the mixer so that the j
high temperature of one or the other is reduced be-fore cement is added.
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d.
Cement is not added tg mixtures of aggregate and water that exceed 100 F.
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/q INSTRUCTION ISSUE REVISION PAGE NUM8ER DATE V
TEXAS UTILITIES GENERATING CO.
.0I-OP-11.0-1:
2 3-5-80 1 or 8 7
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 i
3.3 CURING 3.3.1 Hoisture 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-1 stely following placement and continued throughout the duration of curing:
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a.
Ponding or continuous sprinkling.
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b.
Absorbent mats or fabric kept continuously wet.
I c.
Sand kept continuously wet.
t d.
Steam not exceeding 150 F or sist spray, not to be used on sections greater than 2'-6".
1 Application of waterproof sheet material.
Must be e.
i in full contact with concr'te surfaces and free of e
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.
4 3.3.2 Hoisture Preservation for Surfaces in Contact with Forms j
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
- [I~)h QC Inspector shall verify that one of the methods in
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Paragraph 3.3.1 is employed.
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INSTRUCTION ISSUE V) i REVISION PAGE i
NUM8ER DATE TEXAS UTIUTIES GENERATING CO.
CPSES QI-QP-11.0-l' 2
3 5-80 4 of8 2
c.
The QC Inspector shall verify that concrete surfaces are maintained in a moist condition during form removal.
3.3.3 Changes in Curing Methods, t
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 Requirements of Air Temperature Adjacent to the Concrete l
a.
The air temperature adjacent tg the congrete surface i
shall be maintained between 50 F and 70 F throughout the curing period, except--
b.
On the containment exterior wall the air temperature
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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 curing period.
c.
For sections 2'-6" thick or less, the temperature of the air adjacent to the concrete,* during and immediately following the curing period, shall be held egnstant if possible, and ghall not exceed a change of 5 F in any 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 foundation mats in excess of 2'-6" and the contain-ment exterior wall, the temperature of the air adjacent to the concrete, during and immediately following the curing period, shall be held'cgnatant if possible, and shall not excced a change of 3 F in any one hour or 30,F i
j in any 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period.
3.3.5 QC Inspection for Hsintenance of Temperature Requirements To assure maintenance of temperature requirements, the QC l
Inspector shall verify thats a.
Prior arrangements in Paragraph 3.1.2 are fully imple-mented.
b.
gdges and corners of placements which.are vulnerable to freezing are fully protected.
c.
Combustion heaters emitting exhaust gases which contain
,dg) 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 menn no. t
INSTRUCTION ISSUE REVISION PAGE NUMBER DATE TEXAS UTILITIES GENERATING CO.
.o i -o p - 11. 0 - 1 <
2 13-5-80 s nr8 curing unless the concrete surface is protected from exposure to the gases.
d.
Surface temperatures are taken at several points on the placement to represent highest and lowest temperatures.
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 the end of the curing period, the drop in temperatuge 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 I
greater than 2'-6".
h.
If at any time during the curing period concrete tem-peratures are allowed to' drop below minimum requirements,
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the curing is extended for the length of time that the
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temperature was allowed to remain below the minimum re-quirements.
3.3.6 Duration of Curing a.
Containment exterior walla and foundation mats in excess of 2'-6" shall be cured in a manner which will contain moisture in the concrete for 14 gays.
Scrfact tempera-ture must be maintained above 40 F for 7 days and frees-ing for the remaining 14 days.
1 b.
All concrete placements shall be cured for a minimum of I
7 days and the method employed shall maintain. moisture r
within the concrete for that period of time.
3.4 PROTECTION FROM HECHANICAL INJURY The QC Inspector shall verify that during the curing period, the concrete is protected from'and is not subjected to damaging mechanical disturbances, such as load stresses, heavy shock, and excessive vibration.
He shall also verify that all finished concrete surfaces are protected and do not receive damage from construction equipment, materials or methods, by application of curing procedures, and by rain'or running water.
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INSTPd]CTION ISSUE REVISION PACE EMS UrILITIES GENERATING CO.
NUMBER O
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QI-QP-11.0-11 2
6 of 8 3-5-80 I
3.5 FIELD CURED CYLINDERS l
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 DOCUMENTATION 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
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The QC Inspector shall monitor concrete surface temperature,s a.
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 minimus frequency for monitoring concrete surf ace temp-eratures will be a least once each half of the QC Inspectors shif t 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 conditiens threaten without waiting for additional instructions.
The QC Inspector shall record the day, dates ambient temperature c.
from the, site recording thermometer, weather conditions and con-i crete surface temperatures on the Curing Report Pour Tempe,rature 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 requiremente for "QA Records".
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TEXAS UTILITIES GEi:E?ATli:G CO.
INSTRUCTION ISSU-REVISICT!
PAGE O
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i QI-QP-11.0-11 2
7 0f 8
.3-5.-80.<
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