Steel fiber reinforced pob zeb (SFRC) yog ib hom tshiab ntawm cov khoom sib xyaw uas tuaj yeem nchuav thiab txau los ntawm kev ntxiv cov nqi luv luv steel fiber ntau rau hauv cov pob zeb zoo tib yam.Nws tau loj hlob sai nyob rau hauv tsev thiab txawv teb chaws nyob rau hauv xyoo tas los no.Nws overcomes lub shortcomings ntawm tsawg tensile zog, me me qhov kawg elongation thiab nkig khoom ntawm pob zeb.Nws muaj cov khoom zoo xws li lub zog tensile, khoov tsis kam, shear resistance, tawg tsis kam, qaug zog thiab siab toughness.Nws tau siv rau hauv hydraulic engineering, txoj kev thiab choj, kev tsim kho thiab lwm yam engineering.
1. Kev loj hlob ntawm steel fiber reinforced pob zeb
Fiber reinforced qhob (FRC) yog lub ntsiab lus ntawm fiber reinforced qhob.Nws feem ntau yog cov cement-based composite uas muaj cov cement paste, mortar lossis pob zeb thiab hlau fiber, inorganic fiber lossis organic fiber reinforced cov ntaub ntawv.Nws yog cov khoom siv hauv tsev tshiab tsim los ntawm uniformly dispersing luv thiab zoo fibers nrog siab tensile lub zog, siab kawg elongation thiab siab alkali tsis kam nyob rau hauv lub pob zeb matrix.Fiber hauv pob zeb tuaj yeem txwv cov cim ntawm cov kab nrib pleb thaum ntxov hauv pob zeb thiab kev nthuav dav ntxiv ntawm cov kab nrib pleb raws li kev ua ntawm sab nraud quab yuam, kov yeej qhov tsis xws luag xws li tsis muaj zog tensile, yooj yim tawg thiab qaug zog tiv thaiv ntawm pob zeb, thiab txhim kho kev ua tau zoo. ntawm impermeability, waterproof, Frost tsis kam thiab kev tiv thaiv kev tiv thaiv ntawm pob zeb.Fiber reinforced qhob, tshwj xeeb tshaj yog steel fiber reinforced pob zeb, tau nyiam ntau thiab ntau xim nyob rau hauv kev kawm thiab engineering voj voog nyob rau hauv lub tswv yim engineering vim nws superior kev kawm.1907 Soviet kws muaj txuj B.P.Hekpocab pib siv hlau fiber reinforced pob zeb;Xyoo 1910, HF Porter tau luam tawm tsab ntawv tshawb fawb txog luv luv fiber ntau reinforced pob zeb, qhia tias luv steel fibers yuav tsum tau sib npaug zos rau hauv pob zeb kom ntxiv dag zog rau cov ntaub ntawv matrix;Xyoo 1911, Graham ntawm Tebchaws Meskas tau ntxiv steel fiber ntau rau hauv cov pob zeb zoo tib yam los txhim kho lub zog thiab ruaj khov ntawm pob zeb;Los ntawm xyoo 1940, Tebchaws Asmeskas, Tebchaws Askiv, Fabkis, Lub Tebchaws Yelemees, Nyij Pooj thiab lwm lub tebchaws tau ua ntau yam kev tshawb fawb txog kev siv cov hlau fiber ntau los txhim kho cov hnav tsis kam thiab tawg ua haujlwm ntawm cov pob zeb, kev tsim cov tshuab steel fiber ntau, thiab kev txhim kho cov khoom siv. cov duab ntawm steel fiber los txhim kho lub zog sib txuas ntawm fiber ntau thiab qhob matrix;Xyoo 1963, JP romualdi thiab GB Batson tau luam tawm ib daim ntawv ntawm kev txhim kho kev tawg ntawm steel fiber ntau confined pob zeb, thiab muab tso rau hauv qhov xaus tias lub zog tawg ntawm steel fiber reinforced qhob yog txiav txim siab los ntawm qhov nruab nrab ntawm cov hlau fibers uas ua lub luag haujlwm zoo. nyob rau hauv tensile stress (fiber spacing theory), yog li pib lub tswv yim txoj kev loj hlob theem ntawm no tshiab composite khoom.Txog tam sim no, nrog rau kev nrov npe thiab kev siv steel fiber reinforced pob zeb, vim qhov sib txawv ntawm cov fibers hauv pob zeb, muaj plaub hom: steel fiber reinforced pob zeb, hybrid fiber reinforced qhob, txheej steel fiber reinforced pob zeb thiab txheej hybrid fiber ntau. reinforced pob zeb.
2. Txhim kho mechanism ntawm steel fiber reinforced pob zeb
(1) Composite mechanics txoj kev xav.Txoj kev xav ntawm kev sib xyaw tshuab yog ua raws li kev xav ntawm kev sib xyaw fiber ntau txuas ntxiv thiab ua ke nrog cov yam ntxwv ntawm cov hlau fibers hauv pob zeb.Nyob rau hauv no txoj kev xav, composites raug suav hais tias yog ob-theem composites nrog fiber ntau ua ib theem thiab matrix li lwm theem.
(2) Fiber spacing txoj kev xav.Fiber spacing txoj kev xav, tseem hu ua crack resistance theory, yog npaj los ntawm linear elastic fracture mechanics.Qhov kev xav no tuav tau tias qhov kev txhawb zog ntawm cov fibers tsuas yog cuam tshuam nrog qhov sib faib fiber ntau sib nrug (qhov tsawg kawg nkaus).
3. Kev soj ntsuam ntawm txoj kev loj hlob ntawm steel fiber reinforced pob zeb
1.Steel fiber reinforced pob zeb.Steel fiber reinforced pob zeb yog ib hom kev sib xws thiab ntau qhov kev taw qhia ntxiv dag zog tsim los ntawm kev ntxiv me me ntawm cov pa roj carbon tsawg, stainless hlau thiab FRP fibers rau hauv cov pob zeb zoo tib yam.Qhov sib xyaw ntawm cov hlau fiber ntau yog feem ntau 1% ~ 2% los ntawm ntim, thaum 70 ~ 100kg steel fiber yog sib xyaw hauv txhua qhov cubic meter ntawm pob zeb los ntawm qhov hnyav.Qhov ntev ntawm cov hlau fiber ntau yuav tsum yog 25 ~ 60mm, txoj kab uas hla yuav tsum yog 0.25 ~ 1.25mm, thiab qhov zoo tshaj plaws piv ntawm qhov ntev mus rau txoj kab uas hla yuav tsum yog 50 ~ 700. Piv nrog rau cov pob zeb zoo tib yam, nws tsis tuaj yeem txhim kho tensile, shear, dabtsi yog khoov. , hnav thiab tawg tsis kam, tab sis kuj zoo heev txhim kho cov pob txha toughness thiab cuam tshuam tsis kam ntawm cov pob zeb, thiab txhim kho qhov qaug zog thiab ua haujlwm ntawm cov qauv, tshwj xeeb tshaj yog cov toughness tuaj yeem nce 10 ~ 20 zaug.Cov khoom siv ntawm steel fiber reinforced pob zeb thiab cov pob zeb zoo tib yam tau muab piv rau hauv Suav teb.Thaum cov ntsiab lus ntawm cov hlau fiber ntau yog 15% ~ 20% thiab dej cement piv yog 0.45, lub zog tensile nce 50% ~ 70%, lub zog flexural nce los ntawm 120% ~ 180%, qhov cuam tshuam lub zog nce los ntawm 10 ~ 20 lub sij hawm, qhov cuam tshuam qaug zog lub zog nce los ntawm 15 ~ 20 lub sij hawm, flexural toughness nce 14 ~ 20 zaug, thiab hnav tsis kam kuj tseem txhim kho.Yog li ntawd, steel fiber reinforced pob zeb muaj lub cev zoo thiab cov cuab yeej cuab tam zoo dua li cov pob zeb dawb.
4. Hybrid fiber ntau pob zeb
Cov ntaub ntawv tshawb fawb qhia tau tias steel fiber ntau tsis txhawb nqa lub zog compressive ntawm pob zeb, lossis txawm txo nws;Piv nrog cov pob zeb dawb, muaj qhov zoo thiab qhov tsis zoo (nce thiab txo qis) lossis txawm tias qhov kev xav nruab nrab ntawm impermeability, hnav tsis kam, cuam tshuam thiab hnav tsis kam ntawm steel fiber reinforced qhob thiab kev tiv thaiv ntawm cov yas thaum ntxov shrinkage ntawm pob zeb.Tsis tas li ntawd, steel fiber reinforced pob zeb muaj qee qhov teeb meem, xws li kev siv ntau, tus nqi siab, xeb thiab yuav luag tsis muaj kev tiv thaiv tawg los ntawm hluav taws, uas tau cuam tshuam rau nws daim ntawv thov mus rau qhov sib txawv.Nyob rau hauv xyoo tas los no, qee cov kws tshawb fawb hauv tsev thiab txawv teb chaws tau pib mob siab rau hybrid fiber ntau pob zeb (HFRC), sim sib xyaw fibers nrog cov khoom sib txawv thiab qhov zoo, kawm los ntawm ib leeg, thiab muab kev ua si rau "zoo hybrid effect" ntawm ntau qib thiab loading theem los txhim kho ntau yam khoom ntawm pob zeb, thiaj li ua tau raws li qhov xav tau ntawm cov haujlwm sib txawv.Txawm li cas los xij, hais txog nws cov khoom siv ntau yam, tshwj xeeb tshaj yog nws qaug zog deformation thiab qaug zog kev puas tsuaj, deformation txoj kev loj hlob thiab kev puas tsuaj cov yam ntxwv nyob rau hauv zoo li qub thiab dynamic loads thiab tsis tu ncua amplitude los yog kuj sib txawv amplitude cyclic loads, qhov zoo sib tov npaum li cas thiab sib tov feem ntawm fiber, kev sib raug zoo. nruab nrab ntawm cov khoom siv sib xyaw, kev ua kom muaj zog thiab ua kom muaj zog mechanism, tiv thaiv kev qaug zog kev ua haujlwm, kev ua haujlwm tsis ua haujlwm thiab kev siv thev naus laus zis, cov teeb meem ntawm kev sib xyaw tsim qauv yuav tsum tau kawm ntxiv.
5. Txheej steel fiber reinforced pob zeb
Monolithic fiber reinforced qhob tsis yooj yim rau kev sib xyaw ua ke, cov fiber ntau yog yooj yim rau agglomerate, cov fiber ntau yog loj, thiab tus nqi kuj siab, uas cuam tshuam rau nws daim ntawv thov dav.Los ntawm ib tug loj tus naj npawb ntawm engineering xyaum thiab theoretical kev tshawb fawb, ib tug tshiab hom steel fiber ntau qauv, txheej steel fiber reinforced pob zeb (LSFRC), yog npaj.Ib qho me me ntawm cov hlau fiber ntau yog sib npaug ntawm qhov chaw sab sauv thiab sab qis ntawm txoj kev slab, thiab qhov nruab nrab tseem yog ib txheej pob zeb.Cov hlau fiber ntau hauv LSFRC feem ntau muab faib ua manually lossis mechanically.Cov hlau fiber ntau yog ntev, thiab qhov ntev ntawm txoj kab uas hla feem ntau yog nyob nruab nrab ntawm 70 ~ 120, uas qhia txog kev faib ob sab.Tsis muaj kev cuam tshuam rau cov khoom siv kho tshuab, cov khoom siv no tsis tsuas yog txo cov nqi ntawm cov hlau fiber ntau, tab sis kuj zam qhov tshwm sim ntawm fiber ntau agglomeration hauv kev sib xyaw ntawm cov khoom siv fiber ntau.Tsis tas li ntawd, txoj haujlwm ntawm steel fiber ntau txheej hauv pob zeb muaj kev cuam tshuam zoo rau lub zog flexural ntawm pob zeb.Qhov kev txhawb zog ntawm steel fiber ntau txheej hauv qab ntawm pob zeb yog qhov zoo tshaj plaws.Nrog txoj hauj lwm ntawm steel fiber txheej txav mus, cov nyhuv reinforcement txo qis.Lub zog flexural ntawm LSFRC yog ntau dua 35% siab dua li ntawm cov pob zeb dawb nrog tib qhov sib xyaw ua ke, uas yog me ntsis qis dua li ntawm ib qho steel fiber reinforced pob zeb.Txawm li cas los xij, LSFRC tuaj yeem txuag tau nyiaj ntau ntawm cov khoom siv, thiab tsis muaj teeb meem ntawm kev sib xyaw nyuaj.Yog li ntawd, LSFRC yog cov khoom siv tshiab nrog cov txiaj ntsig zoo ntawm kev sib raug zoo thiab kev lag luam thiab cov kev siv dav dav, uas tsim nyog rau kev nyiam thiab kev siv hauv kev tsim kho pavement.
6. Txheej hybrid fiber ntau pob zeb
Txheej hybrid fiber reinforced pob zeb (LHFRC) yog cov khoom siv sib xyaw tsim los ntawm kev ntxiv 0.1% polypropylene fiber ntau los ntawm LSFRC thiab sib npaug faib ntau cov nplua thiab luv polypropylene fibers nrog lub zog tensile siab thiab siab kawg elongation nyob rau hauv sab sauv thiab qis steel. fiber ntau pob zeb thiab cov pob zeb dawb hauv nruab nrab txheej.Nws tuaj yeem kov yeej qhov tsis muaj zog ntawm LSFRC nruab nrab cov pob zeb ua vaj huam sib luag thiab tiv thaiv qhov muaj peev xwm muaj kev nyab xeeb tom qab cov hlau fiber ntau tau hnav tawm.LHFRC tuaj yeem txhim kho lub zog flexural ntawm pob zeb.Piv nrog rau cov pob zeb dawb, nws lub zog flexural ntawm cov pob zeb dawb yog nce li ntawm 20%, thiab piv nrog LSFRC, nws lub zog flexural yog nce los ntawm 2.6%, tab sis nws muaj me ntsis cuam tshuam rau flexural elastic modulus ntawm pob zeb.Lub flexural elastic modulus ntawm LHFRC yog 1.3% siab dua li cov pob zeb dawb thiab 0.3% qis dua li ntawm LSFRC.LHFRC tseem tuaj yeem txhim kho qhov flexural toughness ntawm pob zeb, thiab nws qhov flexural toughness Performance index yog li 8 npaug ntawm cov pob zeb dawb thiab 1.3 npaug ntawm LSFRC.Ntxiv mus, vim muaj qhov sib txawv ntawm ob lossis ntau dua fibers hauv LHFRC hauv pob zeb, raws li kev xav tau ntawm engineering, qhov zoo hybrid nyhuv ntawm hluavtaws fiber ntau thiab steel fiber ntau hauv pob zeb yuav siv tau los txhim kho cov ductility, durability, toughness, tawg lub zog. , flexural lub zog thiab tensile lub zog ntawm cov khoom, txhim kho cov khoom zoo thiab ntev lub neej kev pab cuam ntawm cov khoom.
—— Abstract (Shanxi architecture, Vol. 38, No. 11, Chen Huiqing)
Post lub sij hawm: Aug-24-2022