ML20137H212

From kanterella
Jump to navigation Jump to search
Rev 4 to Procedure QI-QP-11.0-11, Insp of Cold Weather Concrete Operations
ML20137H212
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 07/02/1982
From: Williams H
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML17198A292 List: ... further results
References
FOIA-85-59 QI-QP-11.0-11, NUDOCS 8512020342
Download: ML20137H212 (10)
v • d • e


Text

{{#Wiki_filter:$$ i (. b* \\

INSTRUCTION

, REVISICN j ISSUE i TEXAS UT UTIES GENERATING CO. NUMBER j CATE PAGE / CPSES V QI-QP-11.0-11 4 UL 2 1982j 1 of 10 : PREPARED SY: N/[8 Es d/E9 'Z INSPECTION OF COLD l / CATE i 0 APPROVED BY: d, N2 APPROVED BY: // /YJCO// DATE

1.0 REFERENCES

1-A Specification 2323-55-9, " Concrete" l 1-B ACI-306, " Recommended Practice for Cold Weather Concreting" 2.0 GENERAL l P

.e

? I 2.1 PURPOSE AND SCOPE j a, e To outline the inspection requirements for cold weather i concrete operations and comply with the requi rements of i l(og Reference 1-A. [ 2.2 DEFINITION AND DETERMINATION i 2.2.1 Cold Weather Concreting As defined in 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 i day in a row... 2.2.2 Detemination i 1 l The detemination that cold weather concreting principles are applicable will be made by the Civil Inspection Supervisor / designee. 3.0 INSTRUCTION N 3.1 PREPLACEMENT INSPECTION ACTIVITIES 3.1.1 Protective Measures The QC Inspector shall verify: I l a. That arrangements f.or covering, insulation, heating l j or housing the placement are made in advance. 8512O20342 851106 F I PDR FOIA 1 ~%-} h{ j l GARDE 8 5-59 PDR moco e. C(.3Z3.J em a y--e--e-w-aluutwW .esg eia e

d l INSTRUCTION ISSUE RWISION PAGE 'O TEXAS UTILITIES GENERATING CO. ^ CPSES QI-QP-11.0-11 4 JUL 2 1992 l 2 of 10 t i 1 b. That the protective measures selected will be adequate to maintain the temperature and moisture content in all parts of the placement. 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 Inspection of Placement Area The QC Inspector shall verify: a. That there is no ice, snow or frost on the construction i.h joint, rebar, forms or any surface in the placement area that will come into contact with fresh concrete. b. That the temperature of all surfaces in the placement area to be in contact with fresh concrete has been raised to a minimum of 40*F. 3.2 BATCHING AND PLACEMENT 3.2.1 Control of Materials i 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 before cement is added. f d. Cement is not added to mixtures of aggregate and water that exceeds 100*F. (. ~ l moco ca =.

i,. ( ( INSTRUCTION ISSUE REVISION PAGE O TEXAS UTILITIES GENERATING CO. Ad t CPSES (QI-QP-11.0-11 4 jy[, 2 1982 3 of 10 3.2.2 Placement Temperature The QC Inspector shall verify that concrete is not placed at a temperature lower than: Sections Less Than 2'-6" Sections Greater 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 immediately following placement and continued throughout the duration of curing: a. Ponding or continuous sprinkling. h b. Absorbent mats or fabric kept continuously wet. c. Sand kept continuously wet. d. Steam not exceeding 150*F or mist spray, not be used on sections greater than 2'-6". e. Applications of waterproof sheet material. Must be in ' full contact with concrete surfaces and free of rips, tears or holes. Material pst confonn to ASTM C171. f. Curing compound applied immediately after any water sheens have disappeared fom concrete surface. Cannot be used on construction joints without specific approval of the Engineer. 3.3.2 Moisture Preservation for Surfaces in Contact with Foms a. For su'rfaces in contact with metal or coated wood 4

forms, no moisture addition or retention methods are required.

b. If fonns are removed during the curing period, the QC Inspector shall verify that one of the methods ir. Paragraph 3.3.1 is employed. I i JO! 1 i t l i i i 6. ""c* ^ ~.. :'l;:- ~i-~~' ' ..JZZff.1. ZZ ZJ~~l _ _iZ.. l".E~ _ lT_, [.~ ' ~

k'.: (l I g INSTRUCTION ISSUE REVISION PAGE ^ 'O' I TEXAS UTILITIES GENERATING CO. i CPSES n QI-QP-11.0-11 4 JUL 2 1982 4 of 10 i c. The QC Inspector shall verify that concrete surfaces are maintained in a moist condition during fom removal. 3.3.3 Changes in Curina 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 hours old, provided the concrete is not permitted to become surface dry during the transi tion. l 3.3.4 Requirements of the Concrete Surface Temperatures f a. When the mean daily outdoor temperature is less than 40*F, the temperature of the concrete shall be maintained between 50*F and 70*F for the required curing period. 4 b. On the containment exterior wall the concrete surface temperature must be maintained above 40*F for a minimum

b of 7 days after placing, and maintained above freezing for the remainder of the it day curing period.

c. For sections 2'-6" thick or less, the temperature of the air adjacent to the concrete, during and imediately following the curing period, shall be held constant if possible, and shall not exceed a change of 5'F in any one hour or 50*F in any 24 hour period. 4 d. For foundation mats in excess of 2'-6" and the containment exterior wall,'the temperature of the air adjacent to the concrete, during and immediately following the curing period, shall be held constant if possible, and shall not exceed a change 3'F in any one hour or 30'F in any 24 hour period. 3.3.5 OC Insoection for Maintenance of Temperature Requirments To assure maintenance of temperature requirements, the QC Inspector shall verify that: a. Prior arrangements in Paragraph 3.1.2 are fully implemented. I b. Edges and corners of placements which are vulnerable 'l to freezing are fully protected, j j 9 i poem pee. t ~ ~ 2: l, _... ~: i. - L*~T~1T :::" T ,~~:: l L L i, ~ . L~

._~ ti,. ( {. l t INSTRUCTION ISSUE REVISION PAGE TEXAS UTILITIES GENERATING CO. i-CPSES j QI-QP-11.0-11 4 5 of 10 M ? 1992 i i' c. Combustion heaters emitting exhaust gases which contain i carbon dioxide are not used during the first 24 hours of curing unless the concrete surface is protected j 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 conditions is not exposed to freezing temperatures. i g. At the end of the curing period, the drop in temperature throughout the first 14 hour period does not exceed 50'F 1 for concrete sections 2'-6" or less and 30*F for sections I greater than 2'-6". j h. If at any time during. the curing period concrete i temperatures are allowed to. drop below minimum requirements, the curing is extended for the length of i time that the temperature was allowed to remain below the minimum requirements. l 3.3.6 Duration of Curino i a. Containment exterior walls and foundation mats in i excess of 2'-6" shall be cured in a manner which will contain moisture in the concrete for 14 days. Surface temperature must be maintained above 40*F for 7 days i i and freezing for the remaining 14 days. b. All concrete placements shall be cured for a minimum i of 7 days and the method employed shall maintain moisture within the concrete for that period of time. 3.4 PROTECTION FROM MECHANICAL INJURY J The QC Inspector shall verify that during the curing period, ) the concrete is protected from and is not subjected to l damaging mechanical disturbances, such as load stresses, i heavy shock, and excessive vibration. He shall also verify I that all finish concrete surfaces are protected and do not receive damage from construction equipment, materials or jf methods, by application of curing procedures, and by rain or running water. ,--.-..=c z.:.::=

rrr:=r:- ~ ~;T:~~* *~~~~~

( ( INSTRUCTION ISSUE REVISION PAGE ^ / TEXAS UTILITIES GENERATING CO. CPSES QI-QP-11.0-11 4 JUL 2 1982 6 of 10 1 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, and given 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 that 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 r Report and submit it to the QC Documentation Supervisor. b 3.6.2 Monitor of Concrete Surface Temoerature Durino Cold Weather Curinq a. The QC Inspector shall monitor concrete surface temperatures of each placement in cure as frequently as possible during his sh!f t, using a surface type dial themometer insulated from the surrounding air., b. The minimum frequency for monitoring concrete surface temperatures will be at 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 a concrete as often as necessary to protect it from freezing when severe conditions threaten without waiting for additional instructions. c. The QC Inspector shall record the day, date, ambient temperature from the site recording thermometer, i weather conditions and concrete surface temperatures on the Curing Report Pour Temperature Record (Figure 2). l (O l I TuoCO oA

~ (, r INSTRUCTION E REVISION PAGE NUMBER g TEXAS UTILITIES GENERATING CO. CPSES QI-QP-11.0-11 4 JUL 2 1952 7 of 10 I' d. Ac 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". W k I /D.v i i rueco a % =.i . ~... -. _... -. -.....

(. (;,. ( Q INSTRUCTION ISSUE REVISION PAGc NUMBER DATE j TEXAS UTILITIES GENERATING CO. j CPSES QI-QP-11.0-11 4 JUI. 2 1932 g of to e FIGURE 1 i I l Pese _of DAP.T C"tM TUTFTCATTON Pour lies Structures Pour Deter Flecament Tees. Seeget y/ Type of Cures 7tme of form Samovela 8 Theroemeter Men IITUDED C3DIC WIIEN APPLICA8LE 9 l 10 '11 12 ! 13 ) La [ l 2l 3l [$ DAT 1 6 7-8 4 t DrITIALS DATE i notes h eurias esmpound to uses, check integrity of applisettee j ty wetting surfese vita e ter. If the water fette droplete er bande. the eartas film to edeguate. I l ' Cmtes 3 i l i i 1 1

ete G.C. Lessesser

/ i b a I TUGCO OA Pe#We No.1 l

, i ( (i I INSTRUCTION REVISION I IS E PAGE NUMBER D - TEXAS UTILITIES GENERATING CO. CPSES QI-QP-11.0-11 4 JUL 2 195:l 9 of to FIGURE 2 l 1.

c. 1

-{ .I ) l s l l .z 'H g l s g e a s s a s g ~ k < T b 1 (O b I T $ s t ~ h E* l g t Q to et I N N 5 ~. ni f t i h gg I w g"- g u 6 = W k $ll Ie l ~ ol1 l$l N l L e s l l j TUCCO CA Pe= w.* . h- .i~.22

  • iC'.l:Zr'.

( (. i 1 INSTRUCTION ISSUE SION PAGE 1 .3 NUMBER CATE g(' TEXAS UTILITIES GENERATING CO. ) CPSES i l 01-QP-11.0-11 4 JUL 2 1982 10 of 10 l ) ATTACHMENT 1 COMANCHE PEAK STEAM ELECTRIC STATION I I m.ert y INSPECT 1CN REPORT se if EM stacAspicio jeCUeTE64 Teen feG AT 5Tgas / 5T AwcTWAL K54meTion c31

v.. n.. r-a c..e. no...e < --.rl
  • I

$Pt.C h4, My MF QC CQC,,#(y & CHAM 4( seq M(45w% GA ILH (QwS.L Qe !, 4Q, SS-9 si slof-09-11.0 11. Pev. a enNfca v$ch O y,We>lg O Q,p,,,,,,, O gg,,, utSP. RESul.t S O== cevio= co terro, au. 4,.uca.6.c items satisracton, D iancro cowarce. uasarmeront its usrto so.o. 5 Ittu me. INSPECTION ATTRIBUTES

  • cart I

aan fung m-e fs 1. lArrangewnts for covering, insulation, heating or housing 1 (j lolacement area - Para. 3.1.1 l } f 2. 1%asures will maintain temoerature and moisture of place-J i i i Iment - Para. 3.1.1 l l 3. lrsce peetection Para. 3.1.1 4 Curing considerations before placement - Para. 3.1.2 A. Pending or Contingog$ $prinkling - para, 3,3,} Io. Atterbeat mats or fabrie kept continuously wet P.3.3.1 l l !P tand kent ennt4mimin1v wet _ - Para. 3.3.1 l i

10. Steam not exceeding 150 r or mist spray not to be used' l

l on sections greater than 2'6" - Para. 3*.3.1 l If. apelf cation of waterproof sheet material. 844terial l j mus t ceasem to 45De C171 Para. 3.3.1 r cueiec rwanund atelied imediately after any water setas have distcoegred from concrete surface-P. 3.3.1 8 .V 4Pp. tnens or freefe in elacea'est area - Para, 3 1.3 lu4,.s.. amor ng,93 ,y,,,,et in elarsesat area P. 3.1.3 g L lCeacrete is not placed at a temoerature lower than:(P.3.2.21) lA. teetiert lett ene 2'6" - 55'F 1 2'**. 40*F R

  • er+4ree ersatse naa l

1 asmaas co es.snes.cre; j (0 l l ' 'V 4 l l 68 f l 1.R. CLOSED Q jaart j,,,,,,, 8 I oc asncton l i '1 l i TUGCO OA Penn see i . -....,....,...}}

Retrieved from "https://kanterella.com/w/index.php?title=ML20137H212&oldid=4212418"