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This is a technical specification document for structural cast-in-place concrete forming at Tinker Air Force Base, Oklahoma, dated April 2019.
The specification establishes requirements for formwork design, materials, and installation for concrete construction projects. The contractor bears responsibility for formwork design, engineering, and construction in accordance with ACI 347 methodology to withstand anticipated loads, lateral pressures, and stresses from concrete placement and vibration. Formwork must comply with ACI 301 Section 2 and ACI 117 tolerances, with surfaces not exposed to public view finished to SF-1.0 standard and publicly exposed surfaces finished to SF-3.0 standard. For ACI Class A surfaces, allowable deflection for facing material between studs, studs between walers, and walers between bracing is limited to 0.0025 times the span. Contractors must submit design analysis and calculations at least 10 days before site fabrication or prefabricated form delivery. The specification addresses retain-in-place metal forms for concrete slabs and roofs, factory-fabricated steel or fiberglass pan-form units for joist and slab construction, and fiber voids constructed of double-faced corrugated fiberboard with paraffin-impregnated wet strength paper liners and moisture-resistant adhesive with minimum 275 psi board strength, designed to support not less than 1000 psf and assembled with steel or plastic banding at 4-foot centers maximum. Fiber void retainers must consist of polystyrene rigid insulation conforming to ASTM C578 Type V, VI, or VII (1-1/2 inches thick by 16 inches high by 3 feet long) or precast concrete units with minimum 2500 psi compressive strength and W1.4 wire mesh reinforcement. Government approval is required for shop drawings of formwork and form removal schedules, fiber void samples, and fiber void certificates. Installation requirements include placing fiber voids on smooth, firm, dry beds, sealing void ends in paraffin, covering formed slab areas with 4-by-8-foot minimum fiber void fiberboard sheets with moisture-resistant tape joints, and installing fiber void retainers continuously on both sides of voids under grade beams. Contractors must inspect forms and embedded items prior to each concrete placement and submit written field inspection reports.
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Text version
Ti nker AFB, OK TAFB Techni cal Spr ci f i cat i ons 2019
SECTI ON 03 11 13. 00 10
STRUCTURAL CAST- I N- PLACE CONCRETE FORMI NG
PART 1 GENERAL
1. 1 REFERENCES
The publ i cat i ons l i s t ed bel ow f or m a par t of t hi s speci f i cat i on t o t he ext ent r ef er enced. The publ i cat i ons ar e r ef er r ed t o wi t hi n t he t ext by t he basi c desi gnat i on onl y.
AMERI CAN CONCRETE I NSTI TUTE I NTERNATI ONAL ( ACI )
ACI 117 ( 2010; Er r at a 2011) Speci f i cat i ons f or Tol er ances f or Concr et e Const r uct i on and Mat er i al s and Comment ar y
ACI 301 ( 2010; ERTA 2015) Speci f i cat i ons f or St r uct ur al Concr et e
ACI 347 ( 2004; Er r at a 2008; Er r at a 2012) Gui de t o For mwor k f or Concr et e
ASTM I NTERNATI ONAL ( ASTM)
ASTM C578 ( 2015b) St andar d Speci f i cat i on f or Ri gi d, Cel l ul ar Pol yst yr ene Ther mal I nsul at i on
1. 2 SUBMITTALS
Gover nment appr oval i s r equi r ed f or submi t t al s wi t h a " G" desi gnat i on;
submi t t al s not havi ng a " G" desi gnat i on ar e f or Cont r act or Qual i t y Cont r ol appr oval . Submi t t he f ol l owi ng i n accor dance wi t h Sect i on 01 33 00
SUBMI TTAL PROCEDURES:
SD- 02 Shop Dr awi ngs
For mwor k; G For m Removal Schedul e; G
SD- 03 Pr oduct Dat a
For m Mat er i al s
SD- 04 Sampl es
Fi ber Voi ds; G
SD- 05 Desi gn Dat a
Calculations
SD- 06 Test Repor t s
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Inspection
SD- 07 Cer t i f i cat es
Fi ber Voi ds
1. 3 DELI VERY, STORAGE, AND HANDLI NG
St or e f i ber voi ds above gr ound l evel i n a dr y l ocat i on. Keep f i ber voi ds dr y unt i l i nst al l ed and over l ai d wi t h concr et e.
PART 2 PRODUCTS
2. 1 SYSTEM DESCRI PTI ON
The desi gn, engi neer i ng, and const r uct i on of t he f or mwor k i s t he r esponsi bi l i t y of t he Cont r act or . Desi gn f or mwor k i n accor dance wi t h met hodol ogy of ACI 347 f or ant i c i pat ed l oads, l at er al pr essur es, and st r esses, and capabl e of wi t hst andi ng t he pr essur es r esul t i ng f r om pl acement and vi br at i on of concr et e. Compl y wi t h t he t ol er ances speci f i ed i n Sect i on 03 30 00 CAST- I N- PLACE CONCRETE, par agr aph TOLERANCES FOR FORM CONSTRUCTI ON. However , f or sur f aces wi t h an ACI Cl ass A sur f ace desi gnat i on, l i mi t t he al l owabl e def l ect i on f or f aci ng mat er i al bet ween st uds, f or st uds bet ween wal er s and wal er s bet ween br aci ng t o 0. 0025 t i mes t he span. Desi gn t he f or mwor k as a compl et e syst em wi t h consi der at i on gi ven t o t he ef f ect s of cement i t i ous mat er i al s and mi xt ur e addi t i ves such as f l y ash, cement t ype, pl ast i c i zer s, accel er at or s, r et ar der s, ai r ent r ai nment , and ot her s. Moni t or t he adequacy of f or mwor k desi gn and const r uct i on pr i or t o and dur i ng concr et e pl acement as par t of t he Cont r act or ' s appr oved Qual i t y Cont r ol Pl an. Submi t desi gn anal ysi s and cal cul at i ons f or f or m desi gn and met hodol ogy used i n t he desi gn. Submi t at l east 10 days ei t her bef or e f abr i cat i on on si t e or bef or e del i ver y of pr ef abr i cat ed f or ms.
2. 2 FORM MATERI ALS
Submi t manuf act ur er ' s dat a, i ncl udi ng l i t er at ur e descr i bi ng f or m mat er i al s, accessor i es, and f or m r el easi ng agent s.
2. 2. 1 Formwork
Compl y wi t h ACI 301 Sect i on 2. Pr ovi de f or sur f aces not exposed t o publ i c v i ew a sur f ace f i ni sh SF- 1. 0. Pr ovi de f or sur f aces exposed t o publ i c v i ew a sur f ace f i ni sh SF- 3. 0. Pat ch hol es and def ect s i n accor dance wi t h ACI 301. Submi t f or m r emoval schedul e i ndi cat i ng el ement and mi ni mum l engt h of t i me f or f or m r emoval .
2. 2. 2 Ret ai n- I n- Pl ace Met al For ms
Use r et ai n- i n- pl ace met al f or ms f or concr et e s l abs and r oof s as speci f i ed i n Sect i on 05 30 00 STEEL DECKS.
2. 2. 3 Pan- For m Uni t s
Use f act or y- f abr i cat ed pan- f or m uni t s of t he appr oxi mat e sect i on i ndi cat ed f or one- way or t wo- way concr et e j oi st and sl ab const r uct i on. Uni t s must consi st of st eel or mol ded f i ber gl ass concr et e f or m pans. Fur ni sh c l osur e uni t s as r equi r ed.
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2. 2. 4 Fi ber Voi ds
Fi ber voi ds must be t he pr oduct of a r eput abl e manuf act ur er r egul ar l y engaged i n t he commer ci al pr oduct i on of f i ber voi ds. Const r uct t he voi ds of doubl e f aced, cor r ugat ed f i ber boar d. Fabr i cat e t he cor r ugat ed f i ber boar d of wet st r engt h paper l i ner s, i mpr egnat ed wi t h par af f i n, and l ami nat ed wi t h moi st ur e r esi st ant adhesi ve, wi t h a boar d st r engt h of 275 psi . Voi ds whi ch ar e i mpr egnat ed wi t h par af f i n af t er const r uct i on, i n l i eu of bei ng const r uct ed wi t h par af f i n i mpr egnat ed f i ber boar d, ar e accept abl e. Desi gn voi ds t o suppor t not l ess t han 1000 psf . To pr event separ at i on dur i ng concr et e pl acement f i ber voi ds, assembl e wi t h st eel or pl ast i c bandi ng at 4 f eet on cent er maxi mum, or by adequat e st apl i ng or gl ui ng as r ecommended by t he manuf act ur er . Fi ber voi ds pl aced under concr et e s l abs and t hat ar e 8 i nches i n dept h may be heavy dut y " waf f l e box" t ype, const r uct ed of par af f i n i mpr egnat ed cor r ugat ed f i ber boar d.
Submi t one sampl e uni t of f i ber voi ds pr i or t o i nst al l at i on of t he voi ds and cer t i f i cat es at t est i ng t hat f i ber voi ds conf or m t o t he speci f i ed requirements.
2. 3 FI BER VOI D RETAI NERS
2. 3. 1 Pol yst yr ene Ri gi d I nsul at i on
Pol yst yr ene r i gi d i nsul at i on must conf or m t o ASTM C578, Type V, VI , or VI I , squar e edged. Si ze: 1- 1/ 2 i nches t hi ck by 16 i nches i n hei ght by 3 f eet i n l engt h, unl ess ot her wi se i ndi cat ed.
2. 3. 2 Pr ecast Concr et e
Pr ecast concr et e uni t s must have a compr essi ve st r engt h of not l ess t han 2500 psi , r ei nf or ced wi t h 6 i nch by 6 i nch by W1. 4 WWF wi r e mesh, and 12 i nches ( hei ght ) by 3 f eet ( l engt h) by 1- 5/ 8 i nches ( t hi ckness) i n s i ze unl ess i ndi cat ed.
PART 3 EXECUTI ON
3. 1 INSTALLATION
3. 1. 1 Formwork
Compl y wi t h ACI 301 Sect i on 2 wi t h sur f ace t ol er ances i n accor dance wi t h
ACI 117.
3. 1. 2 Fi ber Voi ds
Pl ace voi ds on a smoot h f i r m dr y bed of sui t abl e mat er i al , t o avoi d bei ng di spl aced ver t i cal l y, and set t i ght , wi t h no buckl ed car t ons, i n or der t hat hor i zont al di spl acement cannot t ake pl ace. Seal t he ends of each sect i on of voi d by di ppi ng i n par af f i n, wi t h any addi t i onal cut t i ng of voi ds at t he j obsi t e f i el d di p i n t he same t ype of seal er , unl ess l i ner s and f l ut es ar e compl et el y i mpr egnat ed wi t h par af f i n. Pr i or t o pl aci ng r ei nf or cement , cover t he ent i r e f or med ar ea f or s l abs wi t h a 4 x 8 f eet mi ni mum f l at sheet s of f i ber voi d cor r ugat ed f i ber boar d. Seal j oi nt s wi t h a moi st ur e r esi st ant t ape havi ng a mi ni mum wi dt h of 3 i nches. I f voi ds ar e dest r oyed or damaged and ar e not capabl e of suppor t i ng t he desi gn l oad, r epl ace pr i or t o pl aci ng of concr et e.
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3. 1. 3 Fi ber Voi d Ret ai ner s
I nst al l f i ber voi d r et ai ner s, cont i nuousl y, on bot h s i des of f i ber voi ds pl aced under gr ade beams i n or der t o r et ai n t he cavi t y af t er t he f i ber voi ds bi odegr ade.
3. 2 INSPECTION
I nspect f or ms and embedded i t ems i n suf f i c i ent t i me pr i or t o each concr et e pl acement t o cer t i f y t o t he Cont r act i ng Of f i cer t hat t hey ar e r eady t o r ecei ve concr et e. Repor t t he r esul t s of each i nspect i on i n wr i t i ng.
Submi t f i el d i nspect i on r epor t s f or concr et e f or ms and embedded i t ems.
- - End of Sect i on - -
Apr i l 2019 Page 4 SECTI ON 03 11 13. 00 10
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