ML20137G666

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Rev 1 to Procedure QI-QP-11.0-4, Summer Concrete Curing Insp
ML20137G666
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 10/09/1978
From: James Smith
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML17198A292 List: ... further results
References
FOIA-85-59 QI-QP-11.0-4, NUDOCS 8512020232
Download: ML20137G666 (4)


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QI-QP-11.0-4 1

10-9-78 1 of 4 PREPARED BY: _

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Date CONCRETE CURING

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1.0 REFERENCES

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' '!,_. lf l-A Specification 2323-SS-9, " Concrete" 40' fh 2.0 CENERAL 2.1 PURPOSE AND SCOPE To outline the inspection requirements for r,u g curing of all safety related concrete placements.

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3.0 INSTRUCTION kg

.v 3.1 ACCEPTABL

[vr 3.1.1 Surfaces No Contact With Forms For surfaces not in contact with forms, verify that one of the following methods is put into effee,t immediately after placement:

a.

Ponding or continuous sprinkling, b.

Absorbent mats kept continually wet, c.

Sand kept continuously vet, d.

Continuous steam (not exceeding 150 F) or spray mist.

e.

Waterproof sheet material, f.

Curing. compound if approved by Engineer.

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REVISION PAGE q

CPSES QI-QP-11. 0-4 1

10-9-78 2 of 4 3.1.2 Surfaces in Contact With Forms Metal forms in contact with concrete surface are acceptable a.

for moist curing.

b.

Wood forms in contact with concrete surface are not acceptable for moist curing.

3.1.3 Change in Curing Methods Any acceptable curing method may be replaced by one of the 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-crete is not allowed to become surface dry during the transition.

3.2 CURING INSPECTION REQUIREMENTS 3.2.1 Containment Exterior Walls and Foundation Mats in Excess of 2'6" Verify that concrete surfaces are protected from premature a.

drying, b.

Verify that construction joints are kept continuously wet.

The method of curing employed must contain moisture within c.

the concrete for 14 days.

d.

Verify that forms and exposed surfaces are kept wet for the first 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> af ter placing and any time during the curing' period when the ambient temperature is above 900F.

s 3.2.2 Other Placements Requiring Seven Day Minimum Cure Concrete surfaces must.be protected from premature drying.

a.

b.

Construction joints must be kept continuously wet.

c.

The method of curing employed must maintain moisture within the concrete for 7 days.

d.

The rate of air temperature change immediately adjacent to the concrete must not exceed 5 F 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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QI-QP-ll.0-4 1

10-9-78 3.2.3 Field Cured Cylinders Verify that field cured cylinders are placed in or on thc 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 from 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 materials and equipment.

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3. 3 DOCLHENTATION METHOL5 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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' @[yf REVISJ' gyf PAGE CPSES QI-QP-!!.0-4 1

10-9-78 4 of 4 O

FIGURE 1 Page of i

DATI,Y CURING VERIFICATION Pour No Structure:

Pour Date Placement Temp. Range:

Type of Cures Tjw of Foru Removal Thermometer Not EXTENDED CL1tINC MIEN APPLICABLE DAY 1

2 3

4 5

6 7

8 9

10 11 12 13 14 Iu!TIALS DATE

((r Motet Wen curing compound is used, check integrity of application by wetting surface with water. If the water forms droplets or beads, the curing *1lm is adequate.

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