Qhob, ib qho ntawm cov khoom siv hauv tsev ntau tshaj plaws, boasts qhov zoo ntawm compressive zog thiab lwm yam vim nws cov khoom sib xyaw. Txawm li cas los xij, pob zeb tsis muaj zog tensile thiab tsis txaus toughness txwv nws txoj kev siv dav hauv kev tsim vaj tsev. Cov vaj huam sib luag yog qhov ua rau tawg hauv qhov nro lossis khoov, uas sai sai rau kev ua tsis tiav. Hauv kev tsim kho vaj tse niaj hnub no, kev ua haujlwm nyuaj thiab ib puag ncig hnyav (xws li kev thauj khoom siab, tshuaj ntsev tawm tsam, thiab khov -thaw cycles) ua rau muaj kev xav tau ntau dua ntawm cov khoom siv.
Qhov tshwm sim ntawm fiber ntau-cov pob zeb ua kom muaj zog ua kom muaj txiaj ntsig zoo los txhim kho cov pob zeb brittleness. Ntxiv ib hom fiber ntau (xws li steel fiber ntau, polypropylene fiber ntau, lossis iav fiber ntau) tuaj yeem txhim kho nws qhov kev sib tsoo, kev cuam tshuam, thiab kav ntev. Txawm li cas los xij, qhov kev txhawb zog ntawm ib qho fiber ntau feem ntau muaj kev txwv. Piv txwv li, thaum steel fiber ntau zoo hauv kev txhim kho tensile lub zog thiab tawg tsis kam, nws tsis muaj dispersion thiab tshuaj tiv thaiv. Synthetic fibers (xws li polypropylene fibers), thaum zoo dispersed, raug kev txom nyem los ntawm tsis tshua muaj zog thiab zog. Yog li ntawd, hybrid fiber ntau technology, sib txuas ob los yog ntau tshaj fibers kom tag nrho siv cov khoom ntawm txawv fibers, tau tshwm sim.
Lub luag haujlwm ntawm Hybrid Fibers
Lub tswv yim tseem ceeb ntawm hybrid fiber ntau thev naus laus zis yog siv cov khoom sib txuas ntawm cov fibers sib txawv kom kov yeej cov kev txwv ntawm ib qho - fiber ntau reinforcement, yog li ua kom tiav tag nrho cov kev ua tau zoo dua. Piv txwv li, kev sib xyaw ua ke ntawm cov hlau fiber ntau thiab polypropylene fiber ntau tuaj yeem txhim kho lub zog tensile thiab tawg tsis kam ntawm cov pob zeb thaum txo cov kab nrib pleb. Cov nyhuv synergistic ntawm carbon fiber thiab basalt fiber tuaj yeem txo qhov hnyav ntawm cov qauv thaum txhim kho cov khoom siv tiv thaiv kub thiab tshuaj lom neeg corrosion. Tsis tas li ntawd, kev tshawb fawb tsis ntev los no tau pom tias kev qhia txog microfibers xws li nanofibers lossis whiskers tuaj yeem txhim kho microstructure ntawm pob zeb, ntxiv dag zog rau nws cov kev ua tau zoo tag nrho. Nrog rau hauv - txoj kev kawm tob ntawm hybrid fiber ntau - cov pob zeb ua kom muaj zog, nws daim ntawv thov nyob rau hauv cov tswv yim engineering tau nce zuj zus. Los ntawm hnyav- thauj khoom xws li txuas hniav thiab qhov av mus rau marine engineering thiab siab - qhov chaw kub, hybrid fiber ua vaj tse muab cov kev daws teeb meem tshiab rau kev ua haujlwm nyuaj uas cov khoom siv niaj hnub tawm tsam.
Common Hom ntawm Concrete Fibers:
Fiber composites yog cov khoom sib xyaw ua ke ntawm ob lossis ntau dua fibers ntxiv nrog tib lub matrix. Lawv tsis tsuas yog txo cov nqi tab sis kuj siv zog thiab tsis muaj zog, tsim kom muaj kev sib xyaw ua ke. Muaj ntau ntau hom fibers, txhua tus muaj nws tus kheej lub cev thiab tshuaj lom neeg lub zog. Raws li cov khoom siv fiber ntau, lawv tuaj yeem faib raws li hauv qab no:
Hlau fiber ntau:Ib qho ntawm cov fibers feem ntau siv los txhawb cov pob zeb, nws nthuav tawm cov khoom tseem ceeb vim nws lub zog tensile siab thiab nruj. Hlau fiber zoo txuas cov kab nrib pleb, txo cov kab nrib pleb thiab ua kom lub zog tensile, flexural, thiab cuam tshuam tsis kam ntawm pob zeb. Nws lub ntsiab mechanism ntawm kev txiav txim yog tawg bridging thiab nce tawg toughness, zoo txhim kho tag nrho toughness ntawm pob zeb. Txawm li cas los xij, steel fiber ntau muaj qee qhov kev txwv hauv kev tawg, tshwj xeeb tshaj yog nyob rau hauv cov pob zeb loj loj, qhov chaw tsis sib xws ntawm fiber ntau tuaj yeem cuam tshuam rau kev ua tau zoo. Tsis tas li ntawd, steel fiber muaj qhov tsis zoo rau cov tshuaj tiv thaiv corrosion thiab ya raws, txwv nws daim ntawv thov hauv qee qhov chaw tshwj xeeb.
Polypropylene fiber ntau:ib tug hluavtaws fiber, exhibits zoo heev dispersibility thiab tshuaj tiv thaiv thiab yog dav siv nyob rau hauv pob zeb. Polypropylene fiber ntau tuaj yeem txhim kho cov pob zeb tawg ua haujlwm thiab txo qhov kev nthuav tawm ntawm microcracks hauv pob zeb los ntawm nws cov fiber ntau zoo. Polypropylene fiber ntau muaj zog tensile thiab nruj, yog li thaum siv ib leeg, nws yuav cuam tshuam rau tag nrho lub zog ntawm pob zeb. Txawm li cas los xij, nws tuaj yeem tswj tau cov kab nrib pleb zoo thiab txhim kho cov pob zeb ua kom khov thiab tsis muaj zog, ua rau nws muaj txiaj ntsig tshwj xeeb hauv qhov chaw qis - qhov kub thiab txias thiab hydraulic engineering.
iav fiber ntau:Feem ntau yog siv los txhim kho pob zeb tensile lub zog, flexural tsis kam, thiab cuam tshuam tsis kam. Nws lub zog siab thiab zoo heev dispersibility ua rau nws siv dav hauv ntau qhov haujlwm. Piv rau steel fiber ntau, iav fiber ntau muaj cov tshuaj zoo tshaj plaws thiab cov dej noo tsis kam, ua rau nws tsim nyog rau kev siv nyob rau hauv ib puag ncig corrosive xws li hydraulic thiab marine engineering. Txawm li cas los xij, iav fiber ntau yog nkig thiab ua rau tawg, txwv nws daim ntawv thov hauv cov haujlwm uas yuav tsum tau ua kom muaj zog lossis qaug zog.
Carbon fiber ntau:Due to its extremely high strength, low density, and excellent corrosion resistance, it has recently become an increasingly popular concrete reinforcement material. Cov pa roj carbon fiber ntau tuaj yeem ua kom lub zog tensile ntawm pob zeb. Its low density reduces concrete's weight, making it suitable for use in lightweight structures. Cov pa roj carbon fiber muaj qhov ua tau zoo heev rau qhov kub thiab txias thiab tshuaj lom neeg corrosion, ua rau nws tsim nyog rau cov haujlwm ua haujlwm nyob rau hauv siab - qhov kub thiab txias ib puag ncig thiab hnyav tshuaj. Txawm li cas los xij, nws tus nqi kuj tseem txwv nws daim ntawv thov loj -.
Basalt fiber ntau:Lub ntuj fiber nrog zoo heev tiv taus kub thiab tshuaj tua kab mob. Basalt fiber nthuav qhia kev ruaj ntseg zoo dua piv rau cov hlau thiab iav fibers hauv siab - qhov kub thiab txias ib puag ncig, yog li tuav cov ntawv thov dav dav hauv marine engineering, siab - qhov kub thiab txias, thiab chemical engineering. Qhov sib ntxiv ntawm basalt fiber tuaj yeem txhim kho pob zeb qhov hluav taws kub thiab kev tiv thaiv corrosion, ua rau nws tshwj xeeb tshaj yog siv rau hauv cov xov xwm corrosive xws li dej ntsev thiab acidic ib puag ncig. Txawm li cas los xij, vim yog tus nqi ua haujlwm siab ntawm basalt fiber ntau, nws txoj kev siv dav hauv qee qhov kev siv tseem nyuaj.
Nanofibers los yog whiskers:Ib qho khoom siv txhawb nqa tshiab tshiab uas muaj qhov tshwj xeeb ntawm qhov chaw siab thiab lub zog. Kev sib xyaw cov microfibers rau hauv pob zeb tuaj yeem txhim kho nws cov microstructure, ntxiv dag zog rau nws lub zog compressive, tawg tsis kam, thiab impermeability. Piv txwv li, calcium carbonate whiskers, raws li ib tug nano - nplai cov khoom siv, tuaj yeem txhim kho cov khoom ntawm cov pob zeb ua kom zoo dua qub thaum txhim kho lub microscopic pore qauv ntawm pob zeb, txhim kho nws cov kav ntev thiab khov -thaw tsis kam.
Synergistic Mechanism Ntawm Qhob Fibers
2.1 Mechanism ntawm Steel Fiber Action
Cov hlau fibers yog ib qho tseem ceeb hauv kev txhim kho cov pob zeb tawg ua haujlwm, boasting siab zog, siab modulus, thiab zoo heev tensile zog. Hlau fibers feem ntau txuas cov kab nrib pleb, txwv lawv txoj kev nthuav tawm thiab yog li txhim kho pob zeb ua kom tawv thiab cuam tshuam. Thaum cov pob zeb yog raug rau sab nraud quab yuam, steel fibers, ua raws li kev txhawb nqa, tiv thaiv kev tawg tawm los ntawm lawv lub zog siab, tiv thaiv kev tawg sai hauv qhov nro. Thaum cov kab nrib pleb tsim, cov hlau fibers txuas cov kab nrib pleb, ua zoo li txuas hniav, absorbing tensile stress thiab tiv thaiv kev tawg ntxiv.
Cov kev taw qhia ntawm steel fibers feem ntau ho txhim kho pob zeb tensile lub zog, flexural zog, thiab qaug zog kuj. Lawv tshwj xeeb tshaj yog siv dav hauv cov haujlwm uas muaj kev hloov pauv siab, xws li kev tsim kho vaj tse xws li txoj kev, txuas hniav, thiab tunnels. Txawm li cas los xij, thaum siv ib leeg, cov hlau fibers pom cov khoom tawg tsis zoo hauv cov pob zeb thiab cov tshuaj tsis muaj zog. Cov hlau fibers tau yooj yim corroded los ntawm cov kua qaub, cov hauv paus, lossis cov av noo siab, ua rau kev ua haujlwm tsis zoo. Yog li ntawd, hauv kev siv tswv yim, lawv feem ntau ua ke nrog lwm hom fiber ntau los them rau qhov tsis zoo no.
2.2 Lub luag haujlwm ntawm Synthetic Fibers
Polypropylene fiber, feem ntau siv hluavtaws fiber ntau, yog tus yam ntxwv zoo dispersibility, zoo heev tshuaj tiv thaiv, thiab ya raws. Polypropylene fiber ntau tsim cov microfiber network nyob rau hauv lub pob zeb matrix. Lub network no txhim kho cov pob zeb tawg ua haujlwm los ntawm kev txo cov kab nrib pleb thiab faib cov kev ntxhov siab thaum ntxov ntawm kev tawg.
Lub luag haujlwm tseem ceeb ntawm kev ua ntawm polypropylene fiber ntau yog tswj kev tawg. Thaum cov pob zeb raug rau sab nraud quab yuam, polypropylene fiber txo qhov kev nthuav tawm ntawm microcracks los ntawm kev ua kom cov fiber ntau hauv cov pob zeb. Thaum cov kab nrib pleb tshwm sim, cov fibers sau cov kab nrib pleb thiab faib kev ntxhov siab, tiv thaiv kev tawg ntxiv, yog li txhim kho cov pob zeb ua kom tawv thiab cuam tshuam. Tsis tas li ntawd, kev taw qhia ntawm polypropylene fiber ntau pab txhim kho pob zeb tiv thaiv te thiab impermeability.
Qhov cuam tshuam ntawm Hybrid Fiber Incorporation rau kev ua tau zoo ntawm pob zeb
Daim ntawv thov ntawm hybrid fibers hauv pob zeb tau raug kawm ntau, thiab kev tshawb fawb tau pom tias lawv tuaj yeem txhim kho cov pob zeb ua haujlwm zoo, tshwj xeeb tshaj yog nws cov khoom tseem ceeb xws li compression, nro, thiab flexural zog. Cov kev txhim kho no tsis yog tsuas yog txhim kho cov pob zeb ntawm cov qauv kev ua tau zoo tab sis kuj ntxiv dag zog rau nws cov load-cov kabmob muaj peev xwm thiab kav ntev nyob rau hauv kev ua haujlwm hnyav. Los ntawm kev sib xyaw ua ke sib txawv fiber ntau, xws li steel fibers, polyvinyl cawv fibers, thiab iav fibers, hybrid fibers tuaj yeem ua tiav cov txiaj ntsig zoo, kov yeej cov kev txwv ntawm ib fibers thiab txhim kho kev ua tau zoo.
Compressive zog yog ib qho ntawm cov khoom tseem ceeb tshaj plaws ntawm cov pob zeb, cuam tshuam ncaj qha rau kev nyab xeeb thiab thauj khoom -cov kabmob muaj peev xwm ntawm cov pob zeb ua vaj tse. Feem ntau, thaum cov pob zeb ua rau cov loads compressive, cov kab nrib pleb pib nthuav tawm los ntawm cov ntsiab lus tsis muaj zog lossis qhov tsis sib xws hauv cov pob zeb. Qhov kev nthuav tawm tawg no tsis yog tsuas yog txo cov pob zeb ua haujlwm xwb- cov kabmob muaj peev xwm tab sis kuj tseem ua rau qaug zog tsis ua haujlwm. Txawm li cas los xij, qhov sib ntxiv ntawm cov hybrid fibers tuaj yeem hloov kho cov load - coj tus cwj pwm ntawm pob zeb, yog li ua kom nws lub zog compressive.
Kev tshawb fawb tau pom tias kev qhia txog hybrid fibers tuaj yeem txhim kho lub zog compressive ntawm pob zeb. Ntxiv 0.5% thiab 1.0% steel fiber ntau rau siab -lub zog nws tus kheej- sib sau cov cement (HSSCC) nce 28- hnub compressive zog los ntawm 1% thiab 11%, feem. Lub zog compressive ntawm cov pab pawg sim uas muaj polypropylene fibers yog qis dua li ntawm pawg tswj hwm. Hloov cov hlau fibers nrog 0.3% thiab 0.4% polypropylene fibers hauv hybrid fiber ntau cov qauv uas muaj 0.5% fiber ntau txo lub zog compressive ntawm cov qauv hybrid.
Lub zog compressive ntawm hybrid fiber ntau -cov roj siv zog- zoo cement tom qab kho rau 3, 7, thiab 28 hnub yog 18.4 MPa, 28.2 MPa, thiab 38.7 MPa, feem. Piv nrog rau cov qauv roj-zoo cement, cov compressive zog tau nce 48.94%, 24.05%, thiab 25.68%, feem. Cov hybrid fiber ntau txhim kho lub zog compressive. Qhov sib ntxiv ntawm cov fibers ua ib qho txuas hauv cov roj-zoo cement matrix, inhibiting kev txhim kho tawg thiab txhim kho matrix zog. Txawm li cas los xij, raws li cov ntsiab lus fiber ntau nce, cov fibers ua tsis sib luag hauv cov cement matrix thiab zoo li agglomerate, ib nrab offsetting cov nyhuv ntawm cov fibers ntawm cov cement matrix. Tshwj xeeb tshaj yog, kev faib cov fibers sib xyaws-steel, polypropylene, thiab xyoob- hauv pob zeb ua rau peb-sib nqus fiber ntau. Cov fibers no zoo tiv thaiv qhov pib thiab nthuav tawm ntawm cov kab nrib pleb thaum lub pob zeb raug rau cov khoom ntim. Steel fibers, nrog rau lawv lub zog siab thiab nruj, zoo tiv taus thiab disperse compressive loads, txo cov kev ntxhov siab nyob rau hauv lub pob zeb, thiab tiv thaiv kom txhob tawg sai sai.
Cov ntsiab lus:
Qhob fiber reinforced pob zeb (CFRC) tau maj mam siv rau hauv ntau qhov chaw vim nws cov khoom siv tshwj xeeb thiab ua haujlwm ntev. Hybrid fiber reinforced qhob (HFRC) qhia tau hais tias dav siv nyob rau hauv cov choj, txoj kev, marine structures, thiab siab - qhov kub thiab txias. Hauv kev tsim kho choj, HFRC tuaj yeem txhim kho kev ua haujlwm ntev thiab tawg ua haujlwm ntawm cov qauv, ua kom lawv lub neej ua haujlwm tau zoo. Nyob rau hauv siab - chaw tsheb khiav xws li txoj kev thiab lub tshav dav hlau khiav, HFRC qhov cuam tshuam tsis kam thiab tawg ua rau nws xaiv cov khoom siv zoo tagnrho.
Tsis tas li ntawd, HFRC tseem ceeb tshwj xeeb hauv ultra-siab-kev ua tau zoo (UHPC) thiab tus kheej-compacting pob zeb (SCC). UHPC nthuav tawm cov kav ntev thiab lub zog zoo nyob rau hauv cov xwm txheej hnyav, thaum SCC muaj cov dej ntws zoo heev thiab nws tus kheej- cov khoom sib txuam, ua rau nws tsim nyog rau cov txheej txheem nyuaj. Kev taw qhia ntawm HFRC tau ua kom zoo dua cov khoom siv kho tshuab, ua haujlwm ntev, thiab ua haujlwm tau zoo ntawm ob hom kev ua haujlwm siab - ua vaj tse.
Txawm hais tias HFRC tuaj yeem txhim kho cov khoom siv dag zog thiab ua haujlwm ntev ntawm cov pob zeb, nws daim ntawv thov tseem ntsib ntau yam teeb meem. Ua ntej, kev faib tawm tsis sib xws ntawm HFRC hauv pob zeb tseem yog qhov teeb meem tseem ceeb. Vim qhov sib txawv ntawm hom thiab qhov ntev ntawm hybrid fibers, kev faib cov fibers hauv pob zeb yuav tsis sib npaug, uas yuav ua rau muaj kev sib txawv ntawm qee qhov chaw. Yog li ntawd, yuav ua li cas kom ntseeg tau tias qhov sib txawv ntawm cov hybrid fibers hauv pob zeb tau dhau los ua kev sib tw hauv kev siv engineering.
