carboncast spec

7/30/2019 carboncast spec

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CARBONCAST W ALL PANELS 03 45 0 - 1

GUIDE SPECIFICATIO N

FOR

CARBO NCAST W ALL PAN ELS

SECTION 03 450

PART 1 - GENERAL

1.1 RELATED DOCUM EN TS1.2 SUM M ARY

A. This Section includes Carbon Cast p recast concrete w all panel unit s, includingm anufactu re, t ranspor t at ion, handl ing, erect ion, and ot her re lated i t em s such as

anchorage, bear ing pads, sto rage and p rotect ion of t he un i ts .

1. Carbon Cast p recast concret e w all panels are pat ent ed, insulated p anelsreinfo rced w ith prest ressing str ands, C-GRID shear gr id, and w elded w ire steelmesh.

2. Carbon Cast p recast w all panels can be act ing as either bear ing or no n-bearingbui ld ing e lem ents.

B. Related w ork specif ied elsew here (and not part of Oldcast les scop e):1. Cast- in-place co ncret e2. M asonry3. Str uctu ral Ste el4. M iscellaneous steel5. Waterproo f ing6. Flashing and sheet m et al7. Sealant an d caulking8. Paint ing


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1.3 PERFORM AN CE REQU IREM ENTSA. Str uctu ral Perfo rm ance: Provide Carbon Cast precast concrete panel unit s and

connect ions capable of w i thstanding required prevai ling bui ld ing code d esign loads.

B. W arranty: M anufactu rer shal l w arrant that t he CarbonCast precast concrete w al lpanel uni ts w i l l not spal l or show evidence of v is ib le cracking beyond accepted industrystandards, sp l i t t ing, deform at ion, or loosening resul t ing f rom infer ior m ater ia ls or

w orkm anship by th is t rade for a per iod of one (1) year ef fect ive f rom the date of t he

substant ial comp let ion of the precast erect ion. Precast u ni ts show ing such defects wi l l

be repaired or replaced at the p recaster 's opt ion and m ade acceptable to in dustry

standards.

1.4 SUBM ITTALSA. General : Refer to and com ply w i th Div ision 1 Sect ion 01330 Subm it t a ls , for

procedures and addi t ional subm it t a l cr i ter ia .

B. Product Data: For each type of p roduct ind icated. Include technical data and testedphysical and per form ance proper t ies.

C. Design M ixes: For each concret e m ix.D. Shop Draw ings:

1. Erectio n Draw ings:a. M em ber p iece marks and com plete ly d im ensioned s ize and shape of each

m em ber .

b . Plans and/ or e levat ions locat ing and def in ing a ll p roducts furn ished.c. Sections and detai ls showing connections, cast- in i tems and their relat ion

to t he suppo r t ing st ructu res.

1) Detai ls , d imensional to lerances and re lated in format ion of othertrades affect ing CarbonCast precast concrete work should be

furn ished to p recast concrete m anufact urer .

d . Openings and Joints, between members and between members andstructure.

e. Descript ion of al l loose, cast- in and f ield hardw are.f . Field instal led anchor locat ion draw ings.g. Erection sequences, when required to sat isfy stabi l i ty, and handling

requ i rements

1) I f the sequence of erect ion is cr i t ica l to the st ructu ra l stabi l i ty of thestructure, or for access to connections at certain locations, i t should

be not ed on the contract p lans and speci f icat ions.


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2. Product ion Draw ings: Typical mem ber produ ct ion draw ings w i l l be furn ishedonly upon request .

a. Elevat ion v iew of each mem ber.b . Sections and detai ls to indicated quantit ies, size, and posit ion of

reinfo rcing steel, anchors, insert s, et c.

c. Handling devices.d . Dim ensions and f inishes.e. Prest ress for strand.f . Concret e str engt hs.g. M ethod s for sto rage and t ranspor t at ion.

3. Product d esign cr i ter ia:a. Loadings fo r design:

1) Init ial handling and erect io n st ress l im its.2) All dead and l ive loads as specif ied on th e cont ract draw ings.3) Al l o ther loads speci f ied fo r m em bers, w here appl icable.

b . As directed on the contract drawings, design calculat ions of products shallbe per formed, sealed and submit ted for approval by an engineer

registered in t he state w here th e pro ject is located, wh o is exper ienced inprecast, pr estressed concret e design.

c. Design shall be in accordance w ith ap plicable codes or ACI 318 or t he latestedit ion of t he PCI Design Handboo k.

E. Engineering Data:1. Subm it com plete design calcu lat ions for a l l precast m em bers and connect ions.

Indicate al l design loads, includ ing l ive loads, win d loads, seism ic loads, and deadloads. Design calculat ion s shall be pref orm ed, sealed and subm itt ed by PrecastConcret e Cont racto r s Prof essional Engineer, l icensed t o pract ice in th e Stat e

w here Project is located, w ho is experienced in pr ecast, prestressed concrete

design. Design calculat ions shall be based on requirem ent s of Perform ance

Requirement s and pro duct design cr i ter ia specif ied h ere in.

F. Sam ples (Only include w hen Required):1. Subm it t hree sam ples, 12x12 , as required.2.

Pr ior to pro duct fabr icat ion of p recast concrete panel uni ts , for pro jects wherem ore than one f in ish is required, or wh ere m ore than one t ype of reveal is

required, prepare a (4 X 4 ) , par t ia l panel m ock up fo r f ina l approval of t he color

and f in ish; ar range for archi tect s t im ely review o f m ock up at precaster s p lant .

a. Not i fy archi tect w hen sample is ready for rev iew at precaster s p lant , andadvise of schedule im pact i f rev iew is not m ade in a t im ely way.

b . Do not star t produ ct ion fabr icat ion of precast concrete archi tectura l paneluni ts unt i l sample uni t s have received archi tect s wr i t t en approval .


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c. The approved m ock-up panels shal l be a standard of qu al ity for t he colorand range of required f in ishes.

G. Current w elder cer t i f icates for w eld ing of re inforcem ents, shop and f ie ld connect ions.H.

Curren t p lant PCI cert i f icat ion.

1.5 QU ALITY ASSURAN CEA. Fabricator Quali f icat ions:

1. The precast concret e man ufactu rer shall have 5 years of pr oven exper ience inthe d esign and manu facture of precast concrete w al l panels.

2. The pre cast concrete m anufactur ing p lant shal l be long t o precaster l icensed t odesign and m anuf acture Carbo nCast precast con cret e w all panels.

3. The precast concrete m anufactur ing p lant shal l be cer t i f ied by t hePrecast/ Prestr essed Concret e Inst i t ut e Plant Cert i f icat ion Program . Cert i f icat ion

shal l be current at t ime of b idding.

B. Erector Quali f icat ions: Regular ly engaged for at least 5 years in the erect ion of p recastconcrete architectu ra l panels simi lar t o t he r equirem ents of th is pro ject (PCI cer t i f ied

erecto r, cert i f ied S2 or A).

C. Design Stand ards: Com ply w ith ACI 318 and th e design recom m endat ions inPCI M NL 120, " PCI Design Handb oo k--Precast and Prestressed Con cret e."

D. Qual ity-Cont ro l Standard: Com ply w i th PCI M NL 116, "M anual for Qual i ty Cont ro l ;Precast and Prestr essed Concret e."

E. W elding: Qual i fy procedures and p ersonnel accord ing t o AW S D1.1, "Structu ra lW elding Code--Steel" ; and AW S D1.4, "St ructu ral W elding Code--Reinfo rcing Steel."

F. Requirement s of th e fo l low ing Codes:1. ACI 318 Building Code Requ irem ent s for Str uct ural Con crete.2. ACI 347 Recom m ended Pract ice fo r Concrete Form w orks.3. AISC M anual of Ste el Constru ct ion .4. PCI M NL 116, "M anual fo r Quali ty Cont rol; Precast and Prestr essed Concret e."5. PCI Design Hand bo ok, Precast an d Prestressed Con cret e.


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6. AW S D1.1 Str uctu ral W elding Code Steel.7. AW S D1.4 Str uctu ral W elding Code Reinf orcing Steel.8. ASTM Specif icat ions As referred to in Section 2 Product s of t his Specif icat ion.9. CRSI M anual of St andar d Practice.

1.6 DELIVERY, STORAGE, AND HA ND LINGA. Delivery and handling:

1. CarbonCast precast concrete m em bers shal l be l i f ted and suppor t ed d ur ingm anufactur ing, s tockpi ling, t ranspor t ing and erect ion operat ion s only at th el i f t ing or suppor t ing point s, as shown on t he shop draw ings, and w i th su i table

l i f t ing devices. Lif t i ng insert s shall have a minim um safet y facto r of 4. Reusable

l i f t ing hardware and r igg ing shal l have a min im um safety factor of 5 .

2. Transpor t at ion, si te handl ing and erect ion shal l be per form ed by t he precaster ,or i ts agents, w i th equipm ent m ethod s, and qual i f ied personnel acceptable to

the precaster .

B. Storage:1. Store a l l un i ts of f grou nd and c lear of o th er sta in ing in f luences.2. Place stored u nit s so th at iden tif icat ion m arks are discernible.3. Separate stacked m em bers by bat t ens across fu l l w idth of each b ear ing point .

Protect al l edges.

4. Stack so th at l i f t ing devices are accessible and und am aged.5. Protect al l holes and reglets against w ater and ice in freezing w eather .6. Do not use upper m em ber of s tacked t ier as storage area for shor t er m em ber or

heavy equ ipment .

PART 2 - PRODU CTS

2.1 M ANU FACTURERA. Provide Carbon Cast pr ecast concret e insulat ing w all panels as m anufactu red b y

Oldcastle Precast.


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2.2 M ATERIALSA. Concrete:

1. Port land Cemen t: ASTM C 150, Type I or Type II I.2 . Other cement i t ious mater ia ls:

a. Fly ash or natu ral p ozzolans: ASTM C618.b . Ground granulat ed b last fur nace slag: ASTM C989.c.

3. Norm al-We ight Aggregates: Except as m od if ied by PCI M NL 116, ASTM C 33.4. Admixtures:

a. Air-entra ining adm ixtur es: ASTM C260.b . Water reducing, retard ing, accelerat ing, h igh range water reducing

adm ixture s: ASTM C494 o r C1017.c. Viscosi ty-M odi fy ing Adm ixture.d . M etakaolin Adm ixtu re: ASTM C 618, Class N.e. Calcium ch lor id e or adm ixtu res cont aining chlo r ides shall not be used.

5. W ater : Potable.B. Stee l Reinfo rcing:

1. Reinforc ing Bars: ASTM A 615/ A 615M , Grade 60, deform ed.2. Low -Alloy-Steel Reinfo rcing Bars: ASTM A 706/ A 706M , defo rm ed.3. Galvanized reinfo rcing bars: ASTM A767.4. Epoxy coat ed rein forcing bars: ASTM A775.5. Plain-Stee l Wire : ASTM A8 2, as draw n.6. Deform ed-Ste el W ire: ASTM A 496.7. Plain-Stee l Weld ed W ire Fabric: ASTM A 185, fabricated fro m as-draw n steel

w ire in to f la t sheets.

8. Deform ed-Steel W elded W ire Fabr ic : ASTM A 497, f lat sheet .9. Supp ort s: M anufactu rer 's bo lster s, chairs, spacers, and ot her devices for

spacing, suppo r t ing, and f astening re inf orc ing bars and w elded w ire fabr ic in

place accordin g to PCI M NL 116.


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10. Prestr essing Str and: ASTM A 416/ A 416M , Grade 250 or 270, un coated , 7-w ire,low -re laxat ion st rand.

C. C-GRID Epoxy Coated Inter laid Carbon Fiber M esh:1.

Yarn Type : Zolt ek Panex 35, size and st ren gth as specified .

2. Binder Type: Epo xy D1156.3. Yarn/ Strand Direct ion: W arp and w ef t yarns/st rands are to be la id perpend icular ,

w i th w arp laid to w i th in +10 degrees o f perpend icu la r w i th w ef t .

4 . Cross Over Bond: m achine direct ion - 145 lb.; cross-m achine direct ion - 200 lb.5. Str ands: No m issing, broken , or degraded strands.

D. Anchors and Inserts:1. Carbon -Stee l Shapes and Plates: ASTM A 36/ A 36M .2. Carbon -Stee l Headed Studs: ASTM A 108 , AISI 1018 t hro ugh AISI 1020, cold

f inished; AW S D1.1, Type A or B, w ith arc shields.

3. High-Str ength , Low -Alloy Str uctu ral Steel: ASTM A 572/ A 572M .4. Carbon -Stee l St ructu ral Tubing: ASTM A 500, Grade B.5. St ainless steel: ASTM A666 , Type 3 04.6. Bolts: ASTM A307 o r A325.

a. Threaded Rods: ASTM A36, A193 or A307.

7. Deform ed bar anchors: ASTM A496 or A706.8. Finish: For ext er ior steel i tem s, and it em s indicated fo r galvanizing, apply zinc

coat ing by h ot-d ip p rocess accord ing to ASTM A 123/ A 123M , af ter fabr icat ion,

and ASTM A 153/ A 153M , as appl icable.

a. Galvanizing Repair Paint : DOD-P-21035A or SSPC-Paint 20.9. Shop -Prim ed Finish: Prepare surf aces of n on -galvanized steel i tem s, except

th ose surfaces to be em bed ded in con cret e, accor ding to requ irem ent s in SSPC-

SP 3 and shop-apply lead- and chrom ate- f ree, rust- inh ib i t ing pr im er , comp ly ing

w ith perf orm ance requ irem ent s in FS TT-P-664 according t o SSPC-PA 1.

E. Grout :


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1. Sand-Cem ent Grou t: Port land cem ent , ASTM C 150, Type I, and clean, natu ralsand, ASTM C 144. M ix at rat io o f 1 par t cem ent t o 3 par ts sand, by volum e, wi th

min imum w ater requ i red fo r p lacem ent and hydra t ion .

2. Non-shrink grou t: Prem ixed, packaged ferro us or no n-ferr ous aggregate shrink-resistant grout .

F. Bearing Pads:1. Chlor opren e (Neop rene): Conf orm to Div I I , Section 18 of ASSHTO Stan dard

Specif icat ions for Highw ay br idges.

2. Random Orient ed Fiber Reinfo rced: Shall supp ort a comp ressive str ess of 3,000psi w i th no cracking, sp l it t ing or delaminat ing in t he in ternal por t ions of the pad.

3. Plastic: M ult i-mo no m er plast ic st r ips shall be no n-leaching and suppor tconstruct io n loads wi th no v is ib le o vera l l expansion.

G. Insulat ion Opt ions: (Not e to Specif iers Carbon Cast W all Panels are available in avar iety of insulat ion t ypes depending on the design character ist ics of each ind iv idual

proj ect. Below are insulat ion typ es available for use.)

1. Expand ed Polysty ren e (EPS) Board In sulatio n: Rigid, closed cell, expan dedpolystyren e, R-Con tr ol Perfo rm Guard EPS, ASTM C 578, w ith m aximu m f lam e-

spread and sm oke-develo ped ind exes of 75 and 450 respectively, Type choose

(I, 0.90 lb/ cu. f t .) (VII I, 1.15 lb/ cu ft .) (I I , 1.35 lb/ cu. f t .) , and w ith (chooseopt ions) :

a. Perforated polyprop ylene and/ or polyethylene f i lm face.b . Un-per forated polypropy lene and/ or polyethylene f i lm f ace.c. M etal ized f i lm face.d . Un -faced EPS.

2. Extru ded Polysty rene (XPS) Board Insulat ion : Rigid, closed cel l , expandedpolystyrene, ASTM C 578, w i th m axim um f lame-spread and smoke-developed

indexes of 75 an d 450, respectively, Type choo se (IV, 1.60 lb/ cu. f t .) (X, 1.30

lb/ cu. f t .) (VI, 1.80 lb/ cu. f t .) (VII , 2.20 lb/ cu. f t .) (V, 3.00 lb/ cu. f t .) , faced or

unfaced.

3. Extru ded Polyisocyanurat e Board Insulat ion : Rigid, closed cel l , extru dedpoly isocyanurate, ASTM C1289, w i th m axim um f lam e-spread and smo ke-

developed indexes of 75 and 450, respectively, Type I.

4 . Polyethylene Foam Insulat ion: Ethafoam.


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5. M ineral Woo l Fi restop ping Insulat ion: ASTM C 136 for com bust ib i l ity ; ASTM E 84for surface bu rnin g characte r ist ics, f lame spread 25 o r less, sm oke develo ped

450 or less (50 or less in plenum ); instal l in accord ance wit h t he assembly l ist ing

by a nat ional ly recognized test ing laboratory.

2.3 CONCRETE M IXESA. Self Com pacting Concret e (SCC): Proport ion m ixes by laborat ory t r ial batch or f ield

test d ata m etho ds in accordance w i th general ly accepted pract ice to provide SCC w ith

t he appro priat e balance of f i l l ing abil i ty , passing abil i ty and segregation resistance

character ist ics to produce m ater ia ls m eet ing the fo l low ing m in imum proper t ies:

1. Com pressive St rengt h (28 Days): 5000 psi2. Com pressive str engt h at t im e or release: 3000 psi.

B. Norm al-W eight Concrete Face and Backup M ixes: Propor t ion m ixes by e i therlaboratory t r ia l batch or f ie ld test data m ethod s accord ing to ACI 211.1, w i th m ater ia lsto be used on Pro ject , to p rov ide norma l -w e igh t concre te w i th t he fo l lowing

proper t ies:

1. Com pressive St rengt h (28 Days): 5000 p si.2 . M axim um W ater-Cem ent i t ious M ater ia ls Rat io : 0 .45.

C. W ater Absorpt ion: 12 to 14 percent by volum e, t ested accord ing to PCI M NL 116.D. Add a ir -entra in ing adm ixture at m anufacturer 's prescr ibed rate t o result in concrete at

point of p lacem ent having an ai r content com ply ing wi th PCI M NL 116.

2.4 FABRICATIONA. Fabricat ion p rocedu res shall be in general com pliance w ith PCI M NL-116.B. Form w ork: Com ply wit h ACI 347. Prefabricated m old shall be one -piece seam less r igid

m olds for exposed faces. Prevent deform at ion of m olds and m ainta in mo ld sur faces

free of irregular it ies, dent s, sags, or dam age of any kind.

C. Anchorage Hardw are: Fabr icate wi t h suf f ic ient anchorage and embed m ent t o comp lyw i th design requirement s. Accurate ly posit ion fo r at tachm ent of loose hardw are, andsecure in place dur ing precasting op erat ions.

D. Furnish loose steel plates, cl ip angles, seat angles, anchors, dow els, cram ps, hangers,and ot her h ardw are shapes for secur ing precast archi tectura l concrete u ni ts to

suppor t ing and adjacent constru ct ion.


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E. Cast- in r eglets, slot s, ho les, and ot her accessories in p recast architect ural concret euni ts t o receive w indow s, cram ps, dow els, reglets, w aterstops, f lashings, and o ther

s im i lar w ork as ind icated.

F. Reinforcement : Com ply wi t h recom m endat ions in CRSI 's "M anual of StandardPract ice" and PCI M NL 116 for fabr icat ing, p lacing, and suppor t ing re inforcem ent.

G. Reinforce precast concrete w al l un i ts to resist handl ing, t ranspor t at ion, and erect ionstresses.

H. Pre-st ress tendo ns for precast concrete w al l un i ts by e i ther p ost- tensioning or pre-tensioning m etho d. Com ply w i th PCI M NL 116.

I. M ix concrete accord ing to PCI M NL 116 and requirem ents in t h is Sect ion.J. Place concrete in a cont inuo us operat ion to prevent seams or p lanes of w eakness f rom

form ing in precast concrete uni ts . Com ply wi t h requirem ents in PCI M NL 116 form easuring, mixing, tr ansport ing, and placing concret e.

1. The prod uct ion of SCC shal l be carr ied out in p lants in w hich the eq uipm ent ,operat ion and m ater ia ls are sui tably contro l led.

2. Al l product ion staf f involved in t he pr oduct ion of SCC shal l have been t ra inedand po ssess experien ce in SCC.

K. Ident i fy p ickup po ints of precast concrete w al l un i t s and or ientat ion in st ructu re w i thperm anent m arkings, comp ly ing w i th m arkings ind icated o n Shop Draw ings. Impr int

or perm anent ly m ark cast ing date on each precast concrete w all un i t on a sur face thatw i l l not show in f in ished st ructu re.

L. Openings:1. M anufacturer shal l provide for openings 12 inch square or larger as show n on

the cont ract d raw ings.

2. Other open ings shal l be located and f ie ld dr i l led o r cut by t he t rade af tererect ion. Openings shal l be approved b y bot h archi tect and precaster bef oredr i l l ing or cut t ing.

M . Cure concret e, according to req uirem ent s in PCI M NL 116, by accelerated heat cur ingusing low -pressure l ive steam or radiant heat and m oistu re.


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1. SCC can set faster t han convent ional concret e. Init ial cur ing shall com m ence assoon as pract icable after p lacem ent t o m inim ize th e r isk of shrinkage cracking.

N. Fabricate precast concrete w all panels straight and t rue t o size and shape, w ithexposed edges and corner s precise and t rue so each f inished p anel com plies wit h

PCI M NL 116 pro du ct to lerances as w ell as po sit io n to lerances for cast- in i tem s.

O. Patching: Shal l be acceptable provid ing the st ructura l adequacy of the p roduct and th eappearance are not im paired.

P. Dam aged, chipped o r discolored unit s shall be rep laced, patched o r ref inished asdirected by the Archi tect and/ or Engineer , and to their approval .

2.5 FINISH (OPTIONS Select on ly th ose tha t a pp ly)A. Finish expo sed-face surfaces of CarbonCast precast concret e w all panels to m atch

appro ved design refere nce sam ple and as fol lo w s:

1. Sm oot h-Surf ace Form Finish: Free of po ckets, sand streaks, and h oneycom bs,w i th as cast co lor and textu re.

2. See your Precast Concret e Carbon cast m anufactu rer fo r ot her available f inishes.3. Textu red-Surf ace Finish: Imp art by form l iners or insert s to pr odu ce surfaces

free of pockets, st reaks, and honeycom bs, w i th un i form color and textur e.

4. Ret arded / Exposed Aggregate Finish: Use chemical retard ing agents applied toconcrete f orm s and w ashing and bru shing procedures to expose aggregate andsurroun ding m atr ix sur faces af ter fo rm rem oval .

5. Abrasive-Blast Finish: Use abrasive gr it , equipm ent , applicat ion t echniques, andcleaning procedures to provide a un i form f in ished sur face or t o expose

aggregates and surro und ing m atr ix surfaces.

6. Br ick Veneer : Accurate ly p lace th in veneer br ick over form or m old pr ior toplacemen t of co ncrete . (NOTE t o Specif ier: Brick veneer select io ns vary by

region. Consult w ith an AltusGroup precaster regarding availabi l i ty and

accept abil i ty pr ior t o specifying br ick fo r a veneer applicat ion .)

B. Finish al l oth er exposed surfaces of p recast concret e w all un its to m atch face-surfacefinish.

C. Fin ish a l l non -exposed sur faces wi t h a sm oot h as cast or f loat f in ish t hat does notin ter fere w i th the appl icat ion o f other m ater ia ls.


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2.6 SOURCE QUALITY CONTROLA. Quali ty Cont rol Testing: Test and inspect precast concrete accord ing to PCI M NL 116

requirements.

PART 3 - EXECUTION

3.1 EXAM INATIONA. Examine substrates and condi t ions for comp l iance w i th req uirem ents for insta l la t ion

t olerances, t rue and level bearing surfaces, and ot her cond it io ns affect ing

per form ance. Proceed w i th insta l lat ion o nly af ter unsat isfactory condi t ions have been

corrected.

3.2 INSTALLATIONA. Site access: General contr actor shall be responsible fo r pr oviding suitab le access to

the bui ld ing, prope r dra inage and f i rm , level bear ing for th e haul ing and erect ion

equ ipment to opera te under the i r ow n pow er .

B. Preparation of stru ctures to receive precast panels: General cont racto r shall beresponsible for:

1. Providing tr ue, level bearing surfaces on al l f ield p laced bearing surfaces.2. Placement and accurate a l ignment of anchor bol ts , p lates or dow els in co lum n

foot ings, grade beams and ot her f ie ld p laced supp or t ing m em bers.

C. Instal l precast con crete p anels.1. Erect ion shal l be carr ied ou t by com petent erectors that are PCI qual i f ied.2. Provide tem porary suppor t s and bracing as required t o m ainta in posit ion,

stabi l i ty , and a l ignment as uni ts are being perm anent ly connected.

3. M ain ta in hor izon ta l and ver t ica l jo in t a l ignment and un i fo rm jo in t w id th aserect ion pro gresses.

D. Anchor precast concrete uni ts in posi t ion b y bol t ing, w eld ing, grout ing, or as otherw iseindicated.


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E. W elding: Per form w eld ing in comp l iance wi th AW S D1.1 and AWS D1.4, w i th qual i f iedwelders.

1. Repair dam aged steel surfaces by cleaning and app lying a coat of galvanizedrepair paint t o galvanized surfaces or by r e-pr im ing dam aged painted surfaces.

F. Insta l l precast concrete w al l un i ts level , p lum b, square, t rue, and in a l ignment w i thou texceeding the no n-cumu lat ive erect ion to lerances of PCI M NL 125 or 127.

G. Repair exposed exter ior surfaces of p recast concr ete w all un its to reasonably m atchcolor , texture, and un i form ity of approved m ock up panel(s) and surround ing precast

concrete w hen repair is perm it ted b y Archi tect and/ or Engineer .

H. Subject t o app roval of t he Archi tect and precast Engineer , precast concrete w al l panelsm ay be d r il led o r sho t by o ther t rades fo r a t tachment o f o t her bu i ld ing components

prov ided no con tact is m ade w ith p restressing steel. Shou ld spall ing occur, repair of

the spal l shal l be the responsib i li ty of th e t rade d oing the dr i l l ing or the shoot ing.

I. Clean exposed sur faces of precast concrete uni ts af ter erect ion to rem ove w eld m arks,ot her m arkings, dir t , and stains caused by the erect or. I f othe r trades cause damage,

m arks, dir t , or stains they shall be l iable fo r th e costs of cleaning or rep air.

J. Inspection and Accept ance: Final inspectio n and accept ance of erect ed precastconcrete u ni ts shal l be made by t he Archi tect and/ or Engineer w i th in a reasonable

t im e af ter th e precast un i ts are insta l led and f ina l a lignment of t he uni t s is com pleted.

END SECTION 03450

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