ACI 440.2R-02 Thi Cong Va Nghiem Thu Tang Cuong Cau Bang FRP (v)

7/24/2019 ACI 440.2R-02 Thi Cong Va Nghiem Thu Tang Cuong Cau Bang FRP (v)

1/14

ACI 440.2R-02 Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures

ACI 440.2R-02 Thi cng lp 1Ngi dch: ThS. Bi Xun Trng

TIU CHUN ACI 440.2R-02Guide for the Design and Construction of Externally Bonded FRP Systems for

Strengthening Concrete Structures

Chdn thit kv thi cng hFRP kt dnh ngoi i vi vic tng cng kt cub tng

THI CNG LP

[ BN DNCH ]

CC TVIT TT

FRP Fibre Reinforced PolymerPolyme (hp cht cao phn t) ct si

ACI American Concrete InstituteVin nghin cu b tng M

ISRI International Concrete Repair InstituteVin nghin cu sa cha b tng quc t

THUT NG

Nn b tng/Concrete substrate: B tng hin ti hoc bt k vt liu sa cha bng xi mng

c sdng sa hoc thay thb tng hin ti. Nn c thbao gm ton b tng hin ti, tonvt liu hin ti hoc kt hp gia b tng hin ti v vt liu sa cha. Nn l bmt hFRPlp vo.

Cht khi ng/Initiator: Ngun nguyn ttdo thuc nhm nguyn tc ti thiu mt in tn l, sdng khi ng qu trnh lu ha i vi keo poly-ester v vinyl-ester. Nc xy gil ngun phbin nht vnguyn ttdo.

p dng kt dnh ti hn/Bond-critical applications: Vic p dng hFRP tng cng ktcu da vo skt dnh vi nn b tng; vic tng cng khnng un v ct ca dm l cc v dvp dng kt dnh ti hn.

p dng tip xc ti hn/Contact-critical applications: Vic p dng hFRP da trn s tipxc gn gi lin tc gia nn b tng v hFRP. Nhn chung, p dng tip xc ti hn bao gm hFRP bc quanh hon ton chu vi ca mt ct. Trng hp p dng tip xc ti hn nht, hFRP bkt dnh vi b tng ddng lp nhng khng da trn slm vic kt dnh nhchnh. Sbao bc kn b tng htrkhng ng t l mt v dvp dng tip xc ti hn.

Lu ha hFRP/Cure of FRP systems: Qu trnh gy ra sthay i khng thun nghch c tnhca keo phn ng nhit do cc phn ng ha hc. Lu ha in hnh c thc hin bng vic bsung tc nhn hoc cht khi ng lu ha, c hoc khng km theo gia nhit v p lc. Lu hahon ton l im m ti keo t ti c tnh chnh. Slu ha khng mc l tnh trng ctnh chnh khng t c.


2/14



Sbong tch/Delamination: Schia ct dc mt phng song song bmt, cng nhschia ctcc lp ca tm FRP vi nhau.

Nhit chuyn i thy tinh (Tg)/Glass transition temperature: Trung im ca gii hn nhitqua bin i vt liu hai pha (v nhthy tinh hoc polyme cao cp) t(hoc ti) trng thi gin,thy tinh ti (hoc t) trng thi do.

Thm m/Impregnate: Trong polyme ct si, trng thi bo ha si vi keo.

Tm p/Laminate: Mt hoc nhiu lp si bao bc nhau trong cng mt khun keo lu ha.

Tri t/Wet layup: Phng php lm ra sn phNm tm p bng cch p dng hkeo nhchtlng khi t vi hoc thm vo.

Mnh/Ply: Mt lp n vi hoc thm; ming a mnh, khi c ln, to nn mt tm p.

Thi gian ch/Pot life: Khong thi gian sau khi chuNn btrong lc hn hp lng hoc do csdng.

Ming tm/Prepreg: Vt liu si hoc tm si cha keo m c tin trin ti c qunh.

Cc mnh ca ming tNm c lu ha in hnh cng vi ngun nng v p lc; cng nhl sihoc tm tin bo ha.

Cun/Tow: Mt b lng cc dy si lin tc.

TIU CHUN V TI LIU VIN DN

ACI 224.1R Causes, Evaluation, and Repair of Cracks in Concrete StructuresNguyn nhn, nh gi v sa cha nt trong kt cu b tng

ACI 224R Control of Cracking in Concrete StructuresKim sot nt trong kt cu b tng

ACI 503.4 Standard Specification for Repairing Concrete with Epoxy MortarsTiu chun kthut vsa cha b tng vi va epoxy

ACI 546R Concrete Repair GuideHng dn sa cha b tng

ICRI 03730 Guide for Surface Preparation for the Repair of Deteriorated Concrete Resultingfrom Reinforcing Steel Corrosion

Hng dn chun bbmt cho vic sa cha b tng xung cp do gct thp

CHNG 5. THI CNG LP

Quy trnh lp cc hFRP c pht trin bi cc nh sn xut v thng khc nhau gia cc h.Thm na, quy trnh lp c thbin i ngay trong mt h, ty thuc vo loi v tnh trng kt cu.Chng ny trnh by hng dn chung i vi vic lp cc hFRP. Cc nh thu c o toph hp vi quy trnh lp c nh sn xut cung cp mi c lp hFRP. Cc sai lch vi quytrnh ca nh sn xut l khng c php khi khng c stham vn vi nh sn xut.

5.1 Nng lc nh thu


3/14



Nh thu lp hFRP cn chng minh nng lc chuNn bbmt v p dnh hFRP. Nng lc canh thu c thc chng minh bng vic cung cp bng chng vo to v ti liu vcngtrnh lin quan c nh thu hon thnh trc y hoc vic chuNn bbmt v lp thc thFRP trn tng phn kt cu. Nh sn xut hFRP hoc cquan c y quyn ca hcn o tonhn lc ca nh thu theo quy trnh lp hFRP ca hv m bo nhng ngi ny thnh tholp hFRP.

5.2 Nhit , m v xem xt hi m

Nhit , Nm tng i v hi Nm bmt ti thi im lp c thnh hng n slm vic cahFRP. Tnh trng c quan st trc v trong khi thi cng lp bao gm nhit bmt b tng,nhit khng kh, Nm tng i v im sng t tng ng.

Cht lt, keo bo ha v cht dnh thng khng c p dng ln bmt lnh hoc ng bng.Khi nhit bmt b tng hxung di mc ti thiu theo chdn ca nh sn xut hFRP, cthxy ra tnh trng bo ha si khng n v slu ha khng tt cc vt liu cu thnh keo, lmtn hi ston vn ca hFRP. Mt ngun nng bsung c thc dng nng nhit xungquanh v nhit bmt trong khi lp. Ngun nng cn sch v khng lm bNn hoc hhi bmthoc hFRP cha c lu ha.

Keo v cht dnh thng khng c p dng ln bmt Nm hoc t trkhi chng c chto ring p dng cho loi bmt ny. HFRP khng c p dn vo bmt b tng, ni c dichuyn hi Nm. Sdi chuyn hi Nm tbmt b tng qua cc vt liu keo cha lu ha xut hinin hnh di dng bt bmt v c thlm tn hi n skt dnh gia hFRP v kt cu nn.

5.3 Trang thit b

Mi hFRP c trang thit bduy nht c thit kring bit p dng vt liu h. Trang thit

bny c thbao gm cc dng c ln keo, phun, thit bnng/nh vv my cun. Tt ccctrang thit b cn phi sch sv trong tnh trng vn hnh, sdng tt. Nh thu cn c ngic o to vvn hnh, sdng tt ccc trang thit b. Trang bbo hc nhn nhgng tay,khNu trang, knh mt v qun o bo hcn c la chn v mc ph hp vi mi cng vic cangi lao ng. Tt cvt tv trang thit bcn phi c slng cho php thi cng dnlin tc v m bo cht lng.

5.4 Sa cha nn v chun bbmt

Slm vic ca cu kin b tng c tng cng hoc gia cthm vi hFRP ty thuc lnvo nn b tng vng chi cng nh schuNn bv gia cng bmt b tng ng cch. Bmt

c chuNn bkhng ng cch c thdn n smt kt dnh hoc bong tch hFRP trc khi tc struyn lc thit k. Hng dn chung c trnh by trong chng ny cn c p dngcho tt ccc hFRP kt dnh ngoi. Cn c hng dn tnh sn xut i vi mt hFRP cth.Vic chuNn bnn c thpht sinh n, bi rc v tnh trng chia rcc cdn ta nh.

5.4.1 Sa cha nn

Tt ccc vn lin i vi tnh trng ca b tng nguyn thy v nn b tng m c thlm tnhi n s ton vn ca hFRP cn c ch ra trc khi vic chuNn bbmt bt u. Cc tiuchuNn ACI 546R v ICRI 03730 trnh by tmvvic sa cha v chuNn bbmt b tng. Tt cvic sa cha b tng cn p ng yu cu ca bn vthit kv chdn kthut ca dn. Nh


4/14



sn xut hFRP cn c tham vn vkhnng tng thch ca cc vt liu sdng sa chann vi hFRP.

5.4.1.1 Xung cp lin quan n n mn:

H FRP kt dnh ngoi khng nn p dnh vo nn b tng b nghi c cha ct thp b g. Lctrng nlin quan n qu trnh n mn l kh xc nh v c thlm tn hi ton vn kt cuca hFRP p dnh ngoi. Nguyn nhn n mn cn c chr v sxung cp lin quan n nmn cn c sa cha trc khi p dn bt chFRP kt dnh ngoi no.

5.4.1.2 Tim nt:

Mt snh sn xut FRP bo co rng scng ca vt nt 0.010 inch (0.3mm) trln c thnh hng n slm vic ca hFRP kt dnh ngoi qua sbong tch hoc ph hng si. Do ,cc vt nt rng hn 0.010 inch (0.3mm) cn c tim p lc bng epoxy theo tiu chuNn ACI224.1R. Cc vt nt nhhn lra mi trng khc nghit c thi hi tim hoc trm keo ngn nga n mn ct thp hin ti. Tiu chuNn b rng nt vi cc iu kin ldin khc nhauc cho trong ACI 224R.

5.4.2 Chun bbmt

Yu cu chuNn bbmt cn da trn vic p dng hFRP dkin. Vic p dng c thcphn loi thnh kt dnh ti hn hoc tip xc ti hn. p dng loi kt dnh ti hn th dnhtng cng khnng un hoc ct ca dm, bn, ct, tng, i hi lin kt dnh gia hFRP v btng. p dng loi tip xc ti hn th dnhbc ct, chi hi tip xc kn st gia hFRP vb tng. p dng loi tip xc ti hn khng yu cu lin kt dnh gia hFRP v nn b tngnhng vn thng c yu cu thun tin cho vic thi cng lp.

5.4.2.1 p dng kt dnh ti hn:

Vic chuNn bbmt i vi p dng kt dnh gii hn cn tun theo khuyn nghca tiu chuNnACI 546R v ICRI 03730. B tng hoc bmt sa cha p hFRP cn c biu hin timi, khng li lng hoc vt liu khim khuyt. Nhng chm un si quanh gc ca mt ct chnht th yu cu cc gc phi c bn knh ti thiu inch (13mm) ngn nga s tp trungng sut trong hFRP v lrng gia hFRP v b tng. Nhng gc bnhm cn c lm nhnbng ma tt. Cc vt cn, cc gc lm, mt lm v cc vt gn theo c thnh hng ti slm vicca hFRP cn phi c chdu. Cc vt cn v vt gn theo c thcn tNy btrc khi lp hFRP. Cc gc lm, mt lm c thi hi thit ktrin khai c bit m bo duy tr skt dnhca hFRP vi nn. Vic chuNn bbmt c thc hon thin bng cc kthut mi hoc bnnc p lc. Tt cbn, bi, bNn, rc, du, hp cht lu ha, cc lp phhin ti v bt cchtkhc m c thgy trngi ti kt dnh ca hFRP vi b tng phi c tNy b. Cc lrv

rng nhkhc bmt cn c l r hon ton trong khi gia cng bmt. Sau khi hon thnhthao tc gia cng, bmt cn c vsinh v bo v trc khi lp FRP khng c vt liu nogy trngi ti kt dnh c to ra trn bmt.

Bmt b tng cn c chuNn bt chsbmt b tng (CSP) ti thiu l 3 c xc nhbng thanh o bmt ICRI. Cn tham vn nh sn xut FRP xc nh nu ch sbmt khkhn (aggressive) hn. bin thin bt phng cc b, gm cng khun (form lines), khngc qu 1/32 inch (1mm) hoc dung sai phi theo khuyn nghca nh sn xut. Bin thin btphng c thc tNy bbng cch mi th trc khi mi trn hoc bn nc p lc hoc c thlm trn bng bt ma-tt epoxy nu bin thin rt nh. Cc lrv rng cn c trm ma-ttepoxy.


5/14



Tt c cc mt tip nhn h tng cng cn c kh nh khuyn ngh ca nh sn xut. Nctrong cc lrng c thhn chsthm nhp ca keo v lm gim san ci chc. Hm lnghi Nm cn c nh gi theo yu cu ca ACI 503.4

5.4.2.2 p dng tip xc ti hn:

Trong cc ng dng ko theo so b(confinement) cc bphn b tng kt cu, vic chuNn bbmt cn Ny mnh stip xc mt thit lin tc gia bmt b tng v hFRP. Bmt c bc tithiu cn phi phng hoc li Ny mnh ti trng thch hp ca hFRP. Cc lrng ln trn bmt cn c v bng vt liu sa cha tng thch vi b tng hin ti.

Vt liu vi cng nn v m un n hi thp, nhthch cao, c thgim hiu quca hFRPv cn loi b.

5.5 Trn keo

Vic trn keo cn c thc hin ph hp vi trnh tkhuyn nghca nh sn xut FRP. Tt cthnh phn keo cn phi nhit thch hp v c trn vi tlchnh xc ti khi hn hp thnh

phn ng u v hon thin. Cc thnh phn keo thng tng phn mu, do hn hp trn vnc c khi cc vt mu bkhhn.

Keo cn c trn i vi thi gian trn quy nh v c kim tra trc quan vng u mu.Nh sn xut vt liu cn cung cp cc cl khuyn ngh, tltrn, phng php v thi gian trn.Thit btrn c thgn km li trn chy in nhhoc my chuyn dng hoc keo c thctrn khuy bng tay nu cn. Vic trn keo cn vi lng nhm bo rng tt ckeo c thc s dng trong khong thi gian ch ca keo. Keo c trn m vt qu thi gian chkhng nn sdng do tnh nht slin tc tng v snh hng bt li n khnng thm nhp bmt ca keo hoc lm bo ha tm si.

5.6 p dng cc vt liu hp thnhSbc hi c thi km vic p dn mt skeo FRP. HFRP cn c chn c sxem xt ivi tc ng ca chng vmi trng, bao gm pht thi cc hp cht hu cdbay hi v chtc.

5.6.1 Cht lt v Ma-tt

Nhng chc yu cu, cht lt cn c p dng ti tt cdin tch bmt b tng ni hFRP tvo. Cht lt cn c t ng u trn bmt chuNn btlbao phchnh ca nh snxut. Cht lt c dng cn c bo vkhi bi rc, hi Nm v cc cht nhim khc trc khip dn hFRP.

Ma-tt cn c dng vi chiu dy thch hp v tip ni vi cht lt theo khuyn nghca nh snxut FRP. Ma-tt tng hp h, m in hnh l hepoxy c, chcn sdng trm lrng vlm trn im gin on bmt trc khi p cc vt liu khc. Cnh nhm ghghhoc cc vt trtma-tt lu ha cn trn nhn trc khi tip tc thi cng lp.

Trc khi p dng keo bo ha hoc cht dnh, cht lt v ma-tt cn c cho lu ha nhchdnca nh sn xut FRP. Nu ma-tt v cht lt lu ha hon ton, c thi hi vic chuNn bbmt bsung trc khi p dng keo bo ha hoc cht dnh. Yu cu chuNn bbmt cn ly ctnh sn xut hFRP.

5.6.2 Cc htri t


6/14



Cc hFRP tri t in hnh c lp bng tay c sdng tm si kh vi keo bo ha v phitun thkhuyn nghca nh sn xut. Keo bo ha cn c p dng ng u ti tt ccc bmt chuNn b, nhng chst hFRP. Si c thc thm m trong mt qu trnh ring sdng mt my thm keo trc khi t vo bmt b tng.

Si tng cng cn c n nhnhng vo keo bo ha cha lu ha theo cch khuyn nghca

nh sn xut. Khng kh blt gia cc lp cn c gii thot hoc c cn ra khi trc khi keose li. Keo bo ha cn c p dng t c y bo ha si.

Cc lp lin tip keo v vt liu si bo ha cn c t vo trc khi hon thnh slu ha calp keo trc. Nu cc lp trc lu ha, c thyu cu vic chuNn bbmt an xen nhrict nhhoc p dng dung mi theo khuyn nghca nh sn xut.

5.6.3 Cc hp dng my

Cc hp dng my c thsdng cun thm m keo trc hoc cc cun si kh. Cun tNmc nhng keo bo ha bn ngoi v a vo vtr thi cng bng cch ln vt liu. Si kh cthm m ti hin trng trong qu trnh ln.

My bc ban u c dng tng bc ct b tng. Cun si cng c thc cun ngang hayti mt gc chnh. My cun c t quanh ct v tng bc cun vt liu xung quanh chu vict trong khi di chuyn ln v xung. Sau khi bc, h thng nhng keo cn c lu ha ti mtnhit cao. Thng thng, mt ngun nng c t quanh ct theo nhit v lch biu nhtrc ph hp vi khuyn nghca nh sn xut.

Nhit c kim sot m bo cht lng c chc. Lp o FRP c c khng c bt cvtni hoc mi hn no do cc cun l lin tc. Trong tt ccc bc p dng trc, cc chdn canh sn xut hFRP phi c tun theo.

5.6.4 Cc htin lu haCc htin lu ha bao gm khun v, di bng, cc dng li hm in hnh c lp vi chtdnh. Cc cht dnh cn c p dng ng u ln cc bmt c chuNn b, ni h tin luha c t vo, trtrng hp chc chn vsbao bc b tng khng i hi cht dnh gia hFRP vi nn b tng. Cc bmt tm p tin lu ha sc dn cn sch sv c chuNn bphhp vi khuyn nghca nh sn xut. Cc tm tin lu ha hoc cc khun vcong cn c ttrn hoc vo trong cht dnh t theo cch do nh sn xut FRP khuyn ngh. Khng kh lt giacc lp cn c gii thot hoc cn ra khi trc khi cht dnh se li. Cht dnh cn c p dngtheo tldo nh sn xut khuyn nghm bo kt dnh y gia cc lp lin tip.

5.6.5 o bo vLp o cn phi ph hp vi htng cng FRP v c p dng ph hp vi khuyn nghca nhsn xut. in hnh, vic sdng cht ha tan vsinh bmt FRP trc khi thi cng lp o lkhng c do cht ha tan c thc tc dng c hi ti keo polyme. Nh sn xut hFRP cn phchuNn mi ssdng cht tNy ha tan chuNn bbmt FRP trc khi p dng lp o bo v.Lp o cn c kim tra nh kv cn c bo dng m bo hiu quca lp o.

5.7 Phn bvt liu FRP

Hng ca mnh FRP v chui xp mnh cn c chr. Bin i nhvgc, b c5, so vi

hng phn bsi nh c thgy gim ng kstng cng. lch hng ca mnh cn


7/14



c ngi thit kph duyt. Vt liu tm v vi cn c cn theo cch duy tr thng thn vhng ca si. Chgn hoc np gp ca vi hoc cc dng gn sng th khc cn c bo congi thit k.

5.8 Ming a mnh v mi ni ph

C thsdng ming a mnh, min l tt ccc mnh c thm m hkeo, cng ct cakeo truyn ti trng ct gia cc mnh v cng kt dnh gia b tng v hFRP. ivi nhp di, chiu di ming a mnh ca vt liu si hoc nguyn liu tin lu ha c thcdng truyn lc lin tc min l mi ni ph. Mi ni phcn c t so le trkhi c lu khc ca ngi thit k. Chi tit mi ni ph, bao gm cchiu di ph, cn da trn th nghim vphi c lp ph hp vi khuyn nghca nh sn xut.

Do c trng duy nht ca mt shFRP, ming a mnh v mi ni phkhng phi lc no cngthc hin c. Hng dn cthvmi ni phcho trong Chng 12.

5.9 Lu ha keo

Slu ha keo l hin tng phthuc vo thi gian v nhit . Keo lu ha xung quanh c thmt nhiu ngy t n lu ha hon ton. Squ mc v bin ng nhit c thlm chm hocnhanh thi gian lu ha keo. Nh sn xut hFRP c tha ra nhiu cp keo hn nh trc iu chnh cc tnh hung ny.

Cc hlu ha cao i hi sy nng keo n mt nhit cthtrong sut thi kchnh. Skthp khc vthi gian v nhit bn trong ng bao xc nh cn em li slu ha hon chnhca h. Tt ckeo cn c lu ha ph hp vi khuyn nghca nh sn xut. Siu chnh thnhphn ha hc keo ti hin trng l khng c php.

Slu ha cc mnh lp cn c gim st trc khi t cc mnh tip theo vo. Vic lp cc

lp tip theo cn c tm dng nu c hin tng lu ha bt thng.

5.10 Bo vtm thi

Nhit bt li, tip xc nc ma trc tip, bi rc, cht bNn, nh sng qu mc, Nm cao hoccc ph hoi c c thgy hi cho hFRP trong khi lp v gy ra slu ha khng ng ca keo.Vic bo vtm thi nhlu bt hoc tm chn nha c thc yu cu trong qu trnh lp chon khi keo lu ha. Nu c yu cu hchng tm, hFRP phi c lu ha hon ton mitho bhchng v cho php bphn kt cu chu ti trng thit k. Trong trng hp c hhing ngi vi hFRP trong khi lp, cn phi thng bo cho ngi thit kv tham vn nh snxut hFRP.

MC THAM CHIU

CHNG 12: CC CHI TIT TNG CNG

12.2 Chi tit phv mi ni

Cc mi ni tm FRP cn c cung cp nhcho php trong bn vhoc trong chdn k thut

hoc nhcho php ca ngi thit ktheo khuyn nghca nh sn xut. Si hFRP phi lin tc


8/14



v hng theo hng lc ko ln nht. Slin tc si c thc duy tr vi mt mi ni ph. ivi hFRP, mt mi ni phcn c lm bng cch chng gi si dc theo chiu di ca chng.Phn gi ln nhau, hoc chiu di mi ni ghp, ty thuc cng ko v chiu dy ca hvtliu FRP v ccng kt dnh gia cc lp xen kca tm FRP. Cn phi gi ln nhau m bo sph hy ca tm FRP din ra trc sph hy kt dnh gia cc tm FRP gi lnnhau. Phn gi ln nhau yu cu i vi mt hFRP cn c nh sn xut vt liu cung cp vc chng minh qua th nghim, khng phthuc vo nh sn xut. Cc hFRP kiu vsdngi vi cc bphn ct cn c cung cp din tch mrng ph hp ti mi ni, khe tip gip vim u cui m bo sph hy thng qua dy vhn l sph hy ti mt ct mi ni.

i vi cc tm FRP mt phng, mi ni phc yu cu chtheo hng ca si. Cc mi niphkhng i hi theo hng ngang ca si. Cc tm FRP cha cc mnh a phng c nhhng nhiu phng hoc loi vi a phng i hi mi ni phcng a phng duy tr tnhlin tc ca si v cng tng thca cc tm FRP.


9/14

Bn nh km 1

Kim tra, nh gi v Nghim thu 9Ngi dch: ThS. Bi Xun Trng

TIU CHUN ACI 440.2R-02Guide for the Design and Construction of Externally Bonded FRP Systems for

Strengthening Concrete Structures

Chdn thit kv thi cng hFRP kt dnh ngoi i vi vic tng cng kt cub tng

KIM TRA, NH GI V NGHIM THU

[ BN DNCH ]

CC TVIT TT

FRP Fibre Reinforced Polymer

Polyme (hp cht cao phn t) ct siACI American Concrete Institute

Vin nghin cu b tng M

ASTM American Society for Testing and MaterialsHip hi Mvth nghim v vt liu

ISRI International Concrete Repair InstituteVin nghin cu sa cha b tng quc t

ISIS Intelligent Sensing for Innovative StructuresTchc cm bin thng minh i vi kt cu sng to

MSDS Material Safety Data SheetsNhn sliu an ton vt liu

TIU CHUN V TI LIU VIN DN

ACI 503.4 Standard Specification for Repairing Concrete with Epoxy MortarsTiu chun kthut vsa cha b tng vi va epoxy

ACI 503R Use of Epoxy Compounds with ConcreteSdng hp cht epoxy vi b tng

ICRI 03730 Guide for Surface Preparation for the Repair of Deteriorated Concrete Resultingfrom Reinforcing Steel CorrosionHng dn chun bbmt cho vic sa cha b tng xung cp do gct thp

ASTM D 3039 Test Method for Tensile Properties of Fiber Resin CompositesPhng php th nghim i vi cc c trng ko ca cm-pu-zt (vt liutng hp) keo si.

ASTM D 3418 Test Method for Transition Temperatures of Polymers by Thermal Analysis(DTA or DSC)Phng php th nghim i vi nhit chuyn tip ca p-ly-me bng

phn tch nhit (DTA hoc DSC)


10/14

Bn nh km 1


ASTM D 4541 Test Method for Pull off Strength of Coatings Using Portable AdhesionTesterPhng php th nghim cng ko t ca cc lp phsdng my thdnh xch tay

ISIS, 1998, ISIS Standard Test Methods, University of Manitoba, Winnipeg, Manitoba.

Cc phng php th nghim chun ca ISIS,i hc tng hp Manitoba, CanadaISIS-Canada, 1998 Standard Test Methods for FRP Rod and Sheet, University of Manitoba,

Winnipeg, Manitoba.Cc phng php th nghim chun i vi thanh v tm FRP,i hc Tnghp Manitoba, Canada

CHNG 6. KIM TRA, NH GI V NGHIM THU

Chng trnh v tiu chuNn m bo v kim sot cht lng (QA/QC) phi c duy tr bi nh

sn xut, nh thu thi cng v cc bn lin quan khc n dn. Chng trnh kim sot cht lng(QC) cn phi tng hp v bao trm tt ccc kha cnh ca dn tng cng. kim sot chtlng v mc th nghim, kim tra cng nhvic bo qun cc hsty thuc vo quy m vphc tp ca dn.

Vic m bo cht lng c c thng qua tp hp cc kim tra v th nghim thch ng v ccti liu hon cng. Chdn kthut ca dn cn yu cu cung cp khoch bo m cht lngi vi vic thi cng lp v lu ha tt cvt liu FRP. Khoch cn bao gm cc ni dung vanton c nhn, p dn v kim tra hFRP, vtr v xp t cc mi ni, cc iu khon vlu ha,bin php m bo kh bmt, cc mu m bo cht lng, vic vsinh v cc yu cu tun thc nu ti mc 13.3.

6.1 Kim tra

HFRP v cc cng vic lin quan phi c kim tra theo yu cu ca cc tiu chuNn p dng.Nu thiu cc yu cu nhvy, vic kim tra cn c tin hnh bi hoc di sgim st ca mtksc bng cp hoc mt kim tra vin iu kin. Kim tra vin cn c trang bkin thcvhFRP v c o to thng qua thi cng lp rp FRP. Kim tra vin iu kin phi yu cutun thng vi bn v thit kv cc chdn k thut ca dn. Trong qu trnh thi cng hFRP, vic kim tra hng ngy phi c chdn v cn bao gm:

- Ngy gilp rp;

-

Nhit xung quanh, Nm tng i v squan st chung vthi tit;

- Nhit bmt b tng;

- Skh ro bmt theo ACI 503.4;

- Cc phng php chuNn bbmt v mt ct c c khi sdng thanh o bmt ICRI(ICRI surface-profile-chips);

- M tnh lng sch bmt;

-

Loi ngun nng, nu p dng;

- Brng cc vt nt khng c tim Epoxy;

-

Sl ca si hoc ca tm p tin lu ha v vtr tng i trn kt cu;


11/14

Bn nh km 1


- Sl, tlpha trn, thi gian trn v m tnh lng vdin mo ca tt ckeo trn, kccht lt, ma-tt, cht bo ha, cht dnh v cht phc trn cho mt ngy;

- Quan st qu trnh lu ha keo;

- Stun thquy trnh thi cng lp;

- Kt quth nghim ko t: cng dnh, chph hy v vtr;

- c trng FRP tth nghim ca cc mnh mu hin trng hoc cc mnh vt chng nuc yu cu;

- Vtr v kch thc ca cc im bong tch hoc rng kh;

- Qu trnh thi cng chung.

Kim tra vin cn cung cp cho ngi thit khoc chu t(Owner) cc hskim tra v ccmnh vt chng. Khuyn nghrng nhng mnh vt chng cn c gili ti thiu 10 nm hoctrong mt thi gian nht nh do ngi thit kchnh. Nh thu thi cng cn gili cc cc mukeo trn v duy tr mt bn ghi vvic sp xp ca mi l.

6.2 nh gi v nghim thu

Cc hFRP cn c nh gi v nghim thu hoc khng nghim thu da trn vic tun thhockhng tun thbn vthit kv chdn kthut. Cc c trng vt liu ca hFRP, vic thi cngvi dung sai sp t quy nh, xut hin sbong tch lp, slu ha ca keo, dnh vi nn cnc km trong bo co. Dung sai xp t bao gm hng si, chiu dy lu ha, hng mnh, brng v khong trng, bn knh gc, chiu di mi ni phcn phi c nh gi.

Mnh vt chng v cc th nghim ko t c sdng nh gi hFRP thi cng. Vic thti ti chcng c thc sdng khng nh s lm vic (ng x) ca cu kin c tngcng FRP c thi cng (Nanni and Gold 1998).

6.2.1 Vt liu:

Trc khi bt u dn, nh sn xut FRP cn phi trnh chng chvc trng v nhn dngvt liu cthca tt ccc loi vt liu c sdng. Cc th nghim vt liu bsung c thcchdn nu thy cn thit da trn phc tp v rc ri ca dn. nh gi vt liu FRP cchuyn ti c thbao gm cc th nghim cng ko, phn tch phhng ngoi, Tg, thi gianc qunh, thi gian chv cng ct cht dnh. Cc th nghim ny thng c thc hin trncc mu vt c gi ti phng th nghim theo khoch th nghim kim sot cht lng (QC).Cc th nghim tui th ci i vi keo v ng rn lu ha thng c tin hnh ti hintrng.

Cc vt liu m khng p ng yu cu ti thiu theo chnh ca ngi thit ksbloi b. Ccmnh vt chng c thc dng nh gi cng v m un ko, cng mp ni ph, ng cng v Tgca hFRP c lp rp v lu ha hin trng sdng trnh tthi cng tngtnh sdng lp rp v lu ha hFRP. Trong khi thi cng, cc mnh phng c kch thc vchiu dy nh trc c thlp rp ti hin trng theo khoch ly mu nh trc. Sau khi luha ti hin trng, cc mnh mu sau c thc gi vphong th nghim th nghim. Ccmnh vt chng c thc gili hoc trnh ti mt phng th nghim c duyt trong mtthi hp l th nghim cng , cng v Tg. Cng v m un n hi ca vt liuFRP c thc xc nh theo ASTM D 3039 hoc ISIS (1998). Cc c trng nh gi bng thnghim phi c chr. Ngi thit kc thkhc thoc thay i tn sut th nghim.


12/14

Bn nh km 1


Mt shFRP kc cc h tin lu ha v qun bng my khng t cho thm vic lp rp ccming nh, phng, vt chng. i vi nhng trng hp ny, ngi thit kc thiu chnh yucu i vi nh sn xut cung cp cc mnh hoc mu th nghim. Cng ko v m un nhi, cng mp ni phca vt liu FRP cng c thc xc nh sdng th nghim ncamu vng lp rp hin trng (ISIS 1998).

Khi thi cng, cc cc mu keo trn cn c chuNn btheo khoch ly mu nh trc v gili th nghim xc nh mc lu ha (xem mc 6.2.4).

6.2.2 Hng si:

Hng ca si hoc tm p tin lu ha cn c nh gi bng kim tra mt thng. gn sngca si, sxut hin lch si khi ng thng si ni chung theo dng vn xon hoc gn sngcn c nh gi i vi cc hp t.

Ssp xp sai trn 5 ca si hoc tm p tin ha so vi chnh trong bn vthit k(khong 1inch/feet [80 mm/m] cn c bo co ngi thit knh gi v chp thun.

6.2.3 Bong tch:

HFRP lu ha cn c nh gi vbong tch hoc rng kh gia cc lp si hoc gia hFRP v b tng. Cc phng php kim tra cn phi c khnng d c bong tch khong 2 inchvung (1300 mm2) trln. Cc phng php nhsng m/acoustic sounding (ba m), siu m vnhit (thermography) c thc sdng d bong tch lp.

Tc dng ca cc bong tch v cc d thng khc ln nguyn vn v bn ca hFRP cnc nh gi. Kch c, vtr v slng bong tch lin quan ti khp vng p dng cn c xemxt trong bn nh gi.

Quy trnh chp thun chung i vi cc hp t l:

- Cc bong tch nhdi 2 inch vung (1300 mm2) mi ci l chp nhn c min l dintch bong tch di 5% tng din tch dn v khng c qu 10 bong tch nhvy trn 10feet vung (1 m2);

- Cc bong tch ln, trn 25 inch vung (16000 mm2), c th tc ng n s lm vic caFRP lp rp v cn phi sa cha bng cch ct bla chn cc ming nh hng v pmt ming dn phtng ng cc mnh;

- Cc bong tch di 25 inch vung (16000 mm2) c thc sa cha bng cch tim keohoc thay thlp v, ty theo kch cv slng cc bong tch v vtr ca chng.

i vi cc hFRP tin lu ha, mi bong tch cn c nh gi v sa cha tun theo cho

ca ngi thit k. Vo lc hon thnh vic sa cha, tm p cn c kim tra li xc minhrng vic sa cha c hon thin ng.

6.2.4 Lu ha keo:

Slu ha tng i ca cc hFRP c thc nh gi bng th nghim trong phng vmnhvt chng hoc mu cc keo sdng ASTM D 3418. S lu ha tng i ca keo cng c thc nh gi trn hin trng dn bng cch quan st thc thvtnh dnh v ca keo v cng ca bmt lm vic hoc cng ca mu keo gili. Cn tham vn nh sn xut hFRP xc nh cc yu cu xc minh keo lu ha c th. i vi cc h lu ha trc, cc php o dnh-cng cn c thc hin tun theo khuyn nghca nh sn xut.


13/14

Bn nh km 1


6.2.5 Cng dnh:

i vi cc vt p dnh tiu chuNn, th nghim dnh ko ca cc mu khoan li cn c tin hnhtheo cc phng php trong ACI 503R hoc ASTM D 4541 hoc phng php m t bi ISIS(1998). Tn sut ly mu cn phi chr. Cng dnh ko phi vt 200 psi (1.4 Mpa) v biu lsph hy ca nn b tng. Cng thp hn hoc sph hy gia hFRP v b tng hoc gia

cc lp vcn c bo co ngi thit knh gi v chp thun.

6.2.6 Chiu dy lu ha:

Cc mu khoan li nh, in hnh vi ng knh 0.5 inch (13mm), c thc ly chc chnmt cch trc quan chiu dy lp lu ha hoc slp mnh. Tn sut ly mu cn c chr. Vicly mu tcc khu vc ng sut cao hoc cc khu vc mi ni cn trnh. V l do thNm m, lkhoan mu c thc lp y v lm nhn bng va sa hoc ma tt hFRP. Nu c yu cu, mtming dn phFRP t4 n 8 inch (100 n 200 mm) tng ng cc lp vc thc p vokhp lkhoan c lp y v lm nhn ngay sau khi ly mu. Ming dn FRP cn c dntun theo trnh tthi cng ca nh sn xut.

MC THAM CHIU

CHNG 13: BN V, CHDN KTHUT V STUN TH

13.3 Stun th

Chdn kthut cn yu cu nh sn xut hFRP; nh thu lp rp; cquan kim tra, nu c yucu; v tt cnhng n vlin quan n dn trnh thng tin sn phNm v bng chng vtrnh

chuyn mn v kinh nghim ca hcho ngi thit kxem li.

13.3.1 Nh sn xut hFRP:

Yu cu tun thi vi nh sn xut hFRP cn bao gm:

- Nhn sliu vsn phNm chr cc c trng vt l, chc v ha hc ca hFRP v ttccc vt liu hp thnh ca n;

- c tnh ko ca hFRP gm cphng php bo co c trng (si li hoc tm dnton b), phng php th nghim sdng v csthng k sdng xc nh cc ttnh;

-

Ch dn lp rp, bo tr v khuyn ngh chung lin quan n tng vt liu c s dng.Trnh tlp rp cn bao gm ccc yu cu chuNn bbmt;

-

Nhn sliu van ton vt liu ca nh sn xut (MSDS) i vi tt ccc vt liu c sdng;

- Trnh tkim sot cht lng (QC) ln du cc vt liu FRP v chng chvt liu;

- Sliu th nghim bn i vi hFRP trong cc loi mi trng mong mun;

- Cc bo co th nghim kt cu thch ng cho vic p dng xut;

- Cc dn tham kho.


14/14

Bn nh km 1


13.3.2 Nh thu lp rp hFRP:

Yu cu tun thi vi nh thu lp rp hFRP cn bao gm:

- Ti liu dn chng tnh sn xut hFRP vvic c hun luyn lp rp hFRP xut;

- Tham kho dn, bao gm cc ln lp rp tng tln lp rp xut. V d, i vi mtp dng tng th, nh thu cn trnh danh sch cc ln lp rp trc bao gm clnlp rp hFRP xut trong mt p dng tng th.

- Bng chng vnng lc trong kthut chuNn bbmt;

- Trnh tkim sot cht lng bao gm ccc mu ghi chp hoc kim tra hng ngy canh thu.

13.3.2 Cquan kim tra hFRP:

Nu mt cquan kim tra c lp c tham gia, yu cu tun thi vi cquan cn bao gm:

-

Danh sch cc kim tra vin c huy ng trong dn v trnh chuyn mn ca h;-

Cc biu mu kim tra;

- Danh sch cc dn c cc kim tra vin kim tra trc y.

ACI 440.2R-02 Thi Cong Va Nghiem Thu Tang Cuong Cau Bang FRP (v)

Documents