CovKev sib tw ntawm pob zeb hauv Humid Environments
Pob zeb, lub pob txha ntawm cov txheej txheem niaj hnub no, ntsib cov teeb meem tsis tu ncua hauv cov av ntub, ntug dej hiav txwv, lossis kev lag luam aggressive. Cov dej noo, chlorides, thiab ntsev ua kom muaj zog corrosion ntawm cov khoom siv hlau txuas ntxiv, ua rau tawg, tawg, thiab thaum kawg, kev ua haujlwm tsis ua haujlwm. Txhawm rau tiv thaiv qhov no, kev tsim kho kev lag luam yog nce ntxiv mus rau cov khoom siv siab heev. Ntawm cov no, cov khaub thuas rub cov hlau fibers nrog cov xeb tshwj xeeb- cov ntaub ntawv pov thawj tau tshwm sim los ua ib qho kev tsim kho tshiab.
Material Science thiab Txheej Technology
Lub hauv paus ntawm cov tshuaj no yog nyob rau hauv kev sib koom ua ke ntawm lub hauv paus hlau thiab nws cov txheej tiv thaiv. Kev kos duab txias yog txheej txheem tsim khoom uas cuam tshuam nrog rub cov hlau xaim los ntawm kev tuag ntawm chav tsev kub. Cov txheej txheem no ua rau kom lub zog tensile thiab cov ntsiab lus tawm ntawm cov hlau thaum tswj cov ductility, ua rau cov fibers nrog kev ua haujlwm zoo tshaj plaws rau kev tswj kev tawg thiab tom qab- tawg load- cov kabmob hauv pob zeb.
Txawm li cas los xij, lub zog siab ntawm txias rub hlau yog cuam tshuam yog tias nws corrodes. Qhov no yog qhov uas advanced txheej technologies ua qhov tseem ceeb. Tsis zoo li cov hlau liab qab, cov fibers no tau kho nrog cov xeb tshwj xeeb - cov ntaub ntawv pov thawj. Ib txoj hauv kev ua tau zoo heev suav nrog kev siv cov hauv paus ntsiab lus ntawm weathering steel (WS). Cov txheej txheem no yog tsim los tsim kom muaj kev ruaj khov, ua raws li cov txheej txheem oxide (patina) thaum raug dej thiab huab cua. Cov patina no ua raws li kev tiv thaiv kev tiv thaiv, ua kom qeeb ntxiv corrosion los ntawm kev cais cov hlau hauv paus los ntawm cov khoom corrosive xws li oxygen thiab dej. Rau ib puag ncig uas muaj cov av noo siab lossis ntsev- huab cua, xws li cov qauv seaside lossis txuas hniav, cov txheej txheem kuj tseem muaj cov zinc (galvanizing) lossis epoxy-polymer blends. Cov no muab kev tiv thaiv lub cev thiab, nyob rau hauv cov ntaub ntawv ntawm galvanizing, sacrificial cathodic tiv thaiv. Qhov kev xaiv ntawm txheej yog haum rau qhov tshwj xeeb ib puag ncig raug, kom ntseeg tau ntev - lub sijhawm ua haujlwm yam tsis muaj kev saib xyuas tas li xav tau los ntawm cov khoom tsis muaj kev tiv thaiv.
Kev ua tau zoo zoo hauv kev siv pob zeb
Kev sib koom ua ke coated txias kos cov hlau fibers rau hauv pob zeb muab cov txiaj ntsig zoo sib xws, tshwj xeeb hauv cov huab cua hnyav:
1. Enhanced Durability thiab Corrosion Resistance:Lub ntsiab kom zoo dua yog qhov ua tau zoo txuas ntxiv ntawm cov pob zeb ua haujlwm lub neej. Cov xeb-cov pov thawj txheej tiv thaiv kev pib thiab nthuav tawm ntawm corrosion ntawm fiber ntau-matrix interface. Qhov no tuav cov txheej txheem kev ncaj ncees ntawm cov fiber ntau thiab tiv thaiv kev nthuav dav ntawm cov khoom siv corrosion los ntawm kev ua rau sab hauv micro- tawg hauv pob zeb. Qhov no yog qhov tseem ceeb rau cov qauv xws li marine piers, chaw nres tsheb hauv av, cov chaw kho dej, thiab cov plag tsev ua haujlwm raug rau de- cov ntsev ntsev.
2. Txhim kho Mechanical Properties:Cov fibers lawv tus kheej muab peb - qhov ntxiv dag zog. Lawv inhibit yas shrinkage cracking thaum kho thiab tswj cov propagation ntawm cov kab nrib pleb nyob rau hauv load nyob rau hauv hardened pob zeb. Cov txheej txheem kev kos duab txias ua kom cov fibers no muaj lub zog tensile siab thiab zoo heev nrog cov pob zeb matrix, ua rau kev txhim kho toughness, cuam tshuam tsis kam, thiab residual flexural zog.
3. Txo lub neej-Cov nqi voj voog:Txawm hais tias tus nqi pib ntawm cov khoom siv yuav siab dua li cov fibers uas tsis muaj coated los yog ib txwm rebar, qhov ntev - cov txiaj ntsig kev lag luam muaj ntau heev. Cov qauv yuav tsum tau kho tsis tu ncua thiab tsis tshua muaj zog. Qhov kev xav tau ntxiv rau qhov chaw sealers lossis daim nyias nyias ntawm cov pob zeb kuj yuav raug txo. Qhov no ua raws li cov qauv kev tsim kho kom ruaj khov los ntawm kev siv cov khoom siv tsawg tshaj plaws ntawm cov qauv kev ua neej thiab txo cov kev cuam tshuam kev saib xyuas.
4. Kev tsim kho Efficiency:Kev siv cov hlau fibers tuaj yeem ua kom yooj yim kev tsim kho los ntawm ib feem lossis tag nrho hloov cov pa bar lossis mesh reinforcement hauv qee yam kev siv (xws li, slabs ntawm qib, shotcrete). Qhov no ua rau lub sij hawm tso kawm sai dua thiab cov nqi zog qis dua. Cov coated fibers yog uniformly dispersed thoob plaws hauv lub pob zeb ntim, muab omnidirectional tiv thaiv kev tawg.
Kev xaiv thiab kev coj ua zoo tshaj plaws rau kev siv
Txhawm rau kom tau txais txiaj ntsig zoo tshaj plaws, xaiv kom raug thiab tuav yog qhov tseem ceeb:
Txheej Specification:Ua raws li hom txheej txheej rau qhov project cov chav kawm ib puag ncig (xws li ASTM lossis EN cov qauv rau kev raug mob). Rau cov tshuaj chloride heev, epoxy-coated los yog hnyav galvanized fibers yog nyiam.
Fiber Geometry thiab Dosage:Qhov ntev, txoj kab uas hla, thiab cov duab (hooked, ncaj, crimped) ntawm fiber ntau cuam tshuam rub- tawm tsis kam thiab kev ua haujlwm. Qhov ntau npaum li cas (kg / m³) yuav tsum tau xam los ntawm tus kws tsim qauv tsim raws li qhov yuav tsum tau ua.
Qhob Mix Design:Kev sib xyaw yuav tsum tau tsim los ua kom muaj kev ua haujlwm zoo thiab sib txawv ntawm fiber ntau. Admixtures zoo li superplasticizers feem ntau yog siv los tswj kev poob qis yam tsis muaj dej ntxiv.
Cia thiab tuav:Coated fibers yuav tsum tau muab khaws cia rau hauv qhov chaw qhuav hauv lawv qhov ntim thawj zaug kom txog thaum siv los tiv thaiv kev puas tsuaj rau cov txheej los yog cov dej noo nqus ua ntej batching.
Xaus
Kev sib koom ua ke ntawm cov khaub thuas rub cov hlau fibers nrog kev tsim cov xeb- cov ntaub ntawv pov thawj sawv cev rau kev nce qib tseem ceeb hauv kev siv tshuab ua vaj tse rau qhov chaw ntub thiab corrosive. Los ntawm kev sib txuas cov tshuab ua haujlwm siab nrog kev ua haujlwm zoo dua corrosion, qhov kev daws teeb meem no hais txog qhov tsis muaj zog ntawm cov tsoos reinforced pob zeb. Nws tso cai rau kev tsim kho kom ruaj khov, ua haujlwm zoo, thiab tus nqi- cov txheej txheem zoo uas tuaj yeem tiv taus qhov kev sim ntawm lub sijhawm thiab cov ntsiab lus hnyav. Raws li cov ntaub ntawv tshawb fawb txuas ntxiv mus, cov ntaub ntawv sib xyaw ua tau zoo no yuav ua lub luag haujlwm tseem ceeb hauv kev tsim kom muaj kev ruaj khov thiab ntev ntev - cov qauv ntawm lub neej yav tom ntej.