Fiber -} reinfor reinfor reinfor reinfor reinfor reinfor reinfor FAIS (FRC) yog cov khoom siv sib xyaw ua ke, dej khov, thiab sib sau ua kom zoo thiab tsis sib xws thiab tsis sib xws. Cov fibers tuaj yeem yog cov fibers steel, iav fibers, carbon fiber, polymer fibers, nroj tsuag muaj sib txawv los ntawm 34 hli tuaj yeem sib txawv ntawm ob peb lub micron rau 1mm. Tus ntoo khaub lig- seem ntawm cov fiber ntau tuaj yeem yog cov duab hluav taws, voos, lossis square, uas yog nyob ntawm cov khoom siv raw thiab kev ua haujlwm thiab tsim khoom. Cov Fibers yog muab faib ua ob pawg: coarse thiab zoo fibers. Lub taub lossis sib npaug ntawm cov cheeb tsam ntawm cov fiber ntau feem ntau yog tsawg dua 0.3mm, thaum lub taub ntawm coarse cov hmoov ntau dua los yog sib npaug rau 0.3mm. Qhov thiaj li-} hu ua txoj kab sib npaug yog cov cross inch uper hloov dua siab tshiab li ntawm cov kab ncig, uas yog, (4a / π) 0.5.
Qhov feem pua feem pua ntawm cov fiber ntau hauv cov pob zeb yog feem ntau 0.1% rau 5%. Qhov loj ntawm cov feem pua no nyob ntawm feem ntau yog ntawm kev yooj yim ntawm kev sib xyaw ntawm cov sib tov thiab daim ntawv thov kev sib xyaw ntawm txoj haujlwm. Piv txwv li, cov kev ntxhov siab theem nrab tshwm sim los ntawm shrinkage thiab qhov ntsuas kub hloov pauv yog tswj tau los ntawm kev daws teeb meem tsawg (0.1% rau 0.3% los ntawm ntim). Thaum cov ntsiab lus fiber ntau dua 0.3%, cov tshuab ua haujlwm ntawm cov pob zeb ua haujlwm ntau yam tsis muaj fiber ntau, feem ntau- bearing. Lub peev xwm ntawm fiber ntau pob zeb ua kom nqus lub zog tom qab tawg yog hu ua "Toughness". Thaum ntau dua cov roj fiber ntau ntxiv rau cov pob zeb ua vaj tse, ntxiv rau cov khoom tawg, cov pob zeb ua kom pom ntau dua {{}} extingleathing tej yam ntxwv. Hauv lwm lo lus, cov khoom siv no tuaj yeem tiv thaiv cov kev nyuaj siab ntau uas tshaj li cov neeg ua haujlwm tsis zoo. Nyob rau hauv cov pseudo no - dals composites, ntau qhov tawg thiab txiav txim siab nqus cov yam ntxwv feem ntau pom.
Cov hom fiber ntau txhawb kev ua vaj tse
Tus Txheej Txheem Asmeskas ATM C116 / C116M muab plaub hom Fiber Ntau Zog (SFRC), uas yog cov hlau fiber ntau, thiab cov roj carbon hlau; Qhov thib ob yog iav fiber ntau qhob (GFRC), uas yog tsim ntawm alkali- Resistant iav ntxaij; Qhov thib peb yog hluavtaws fiber ntau pob zeb ua (synfrc), thiab plaub yog natural fiber ntau yam (nfrc).
Raws li tuaj yeem pom los ntawm lub rooj saum toj no, lub zog thiab Elastic Modulus ntawm cov hlau fiber ntau yog qhov yooj yim, thiab nws tsis yooj yim rau xeb vim tias nws yog nyob rau hauv ib puag ncig alkaline. Txoj kev sib raug zoo ntawm nws thiab cov sib tov tuaj yeem ua tiav ntau dua kev siv tshuab tog los ntawm kev txhim kho saum npoo av thiab deformation.
Cov hluavtaws hluavtaws tsuas yog tsis - nws yog xim hlau fibers tsim los ntawm kev txhim kho ntawm cov petrochemical thiab textile Industries, suav nrog ntau hom polymers. Cov hauv qab no yog qee cov hluavtaws hluavtaws nquag siv nyob rau hauv precast pob zeb ua:
Carbon Fiber
Piv nrog steel fiber ntau, iav fiber ntau, polypropylene fiber ntau, kev ua kom zoo dua qub, tshuaj lom neeg ruaj khov nyob rau hauv alkalive ib puag ncig; Tsis tas li ntawd, nws muaj tus yam ntxwv ntawm kev txhim kho ntau yam khoom siv.
Nylon fiber ntau / polyamide fiber
Hom fiber ntau no muaj cov zog tensile muaj zog, muaj kev kub ntxhov, rov qab zoo nkauj, thiab zoo nkauj hauv cov cement alkaline ib puag ncig.
Polyprropylene
Cov fiber no muaj qhov tsawg me me elastic thiab tsis tsim nyog rau precast qhob cov khoom nyob rau hauv high {}} kub autoclaving. Txawm li cas los xij, vim nws qhov qis melting point, nws tuaj yeem siv los tsim cov ntaub ntawv regractory lossis cov khoom lag luam uas muaj hluav taws kub. Muaj ob hom polypropylene fibers siv rau cov pob zeb qhov cuab lub zog: monourilaments thiab fibrillated fibers (ncab cov nplais). Cov fibers yog hydrophobic thiab muaj lub kaum ntse ntse loj nrog dej. Yog li ntawd, lawv muaj tus neeg ua haujlwm tsis zoo nrog cov qhob dua hydrophilic fibers.
Polyvinyl Cawv Fibic
Qhov fiber no yog ua los ntawm PVA cob los ntawm ntau cov txheej txheem ntawm kev ncab siab thiab muaj siab tawv thiab dej tsis kam. Lub xeev faib hluav taws xob fiber ntau hauv cov qhob ua ke tau hloov los ntawm kev kho tshwj xeeb. Hmoov tsis zoo, pva fiber muaj qhov loj me thermal coeffage, thiab nws txoj kev shrinkage yog li 4% ntawm 200 degree. Nws tau zoo tsis kam rau alkaline ib puag ncig thiab cov kuab tshuaj organic, thiab muaj lub zog me me ploj hauv qab ntev- Term ultraviolet hluav taws xob.
Iav Fiber
Cov iav fiber siv hauv cov pob zeb yuav tsum muaj tsawg kawg 16% zironium dioxide rau cov alkali tsis kam; Lwm hom iav fiber, xws li alkali - fiber ntau, tsis pom zoo rau kev siv hauv kev ua vaj tse. Iav Fiber muaj cov modulus siab thiab lub zog siab, thiab muaj qhov sib khi zoo nrog cov pob zeb. Qhov sib txawv ntawm cov iav fiber proleks prolequined pob zeb thiab lwm yam fiber ntau txhawb kev ua yog cov ntsiab lus fiber; Cov lej qub muaj cov fiber ntau feem pua ntawm 4% rau 6%, thaum lub tom kawg, lossis lwm yam fiber ntau cov feem pua yog hais txog 0.1% rau 1%. Yuav kom ua tiav cov ntsiab lus siab ntawm cov ntsiab lus iav, cov pob zeb sib xyaw xav tau cov ntsiab lus siab ntawm cov cement, thiab yuav luag tsis muaj co coarse aggregate.
Lub luag haujlwm ntawm fiber ntau hauv pob zeb
Qasi - zoo li qub chaw thau khoom thiab cuam tshuam teb
Fibers tuaj yeem txhim kho cov khoom siv neeg kho tshuab. Kev Cuam Tshuam Tso Hluav Taws Xob Qhia Tias Muaj Zog Ntawm Polypropylene Fiber Ntau dua li ntawm cov theem pib sib tsoo thiab theem kawg nkaus pob txha lov. Tam sim no tsis muaj txoj kev sib koom tes ua ke los txiav txim siab lub zog compressive ntawm fiber ntau pob zeb ua yog 85% kom 100% siab dua li ntawm cov pob zeb ua kom zoo nkauj; Cov kev tshawb fawb ntxiv tau qhia tias nyob rau hauv kev cuam tshuam loads, fiber ntau pob zeb ua tsis muaj qhov tseeb peak condility, uas feem ntau vim tias cov pob zeb ua haujlwm tsis sib raug zoo rau cov fibers. Txawm hais tias cov txiaj ntsig kev sim ua qhia tau tias qhov cuam tshuam coefficient ntawm steel fiber ntau yog tsis txawv ntawm cov pob zeb ua ke, nrog kev cuam tshuam coefficient ntawm txog 1.5. Tsis tas li ntawd, cov txiaj ntsig qhia tau tias peb - qhov seem ntawm stormiciing stormied cuam tshuam ntau tshaj li ob {{} qhov seem tsis muaj zog steel fibers; Txawm li cas los xij, lub zog tensile nyob rau hauv cov khoom siv tsis sib haum thiab cov ntawv uas yog khoov rau lub zog tom qab tawg tau txhim kho.
Kev ua yeeb yam ntawm cov pob zeb nyob rau hauv kev cuam tshuam hauv kev cuam tshuam nyob ntawm cov fibers thiab cov qhob hauv qab kev txhim kho tus nqi. Cov kev tshawb fawb tau pom tias muaj cov nqi thauj khoom, siv hlau ua kom loj dua rau kev loj hlob ua kom tawg, tab sis tom kawg tau ntes nrog cov qub; Nws yog speculated hais tias qhov no feem ntau yog vim muaj polypropylene fibers lawv tus kheej yog kev tiv thaiv ntau dua cov nqi hlau.
Tswj ntawm shrinkage cracks
Nws yog qhov paub zoo tias cov fibers tuaj yeem cuam tshuam qhov dawb nyab thiab lwm yam uas muaj hnub nyoog ntawm Maas-} raws li composites. Cov kev tshawb fawb tau pom tias kev siv cov polyethylene fibers nrog feem pua feem pua ntawm li 1% tuaj yeem txo cov yas dawb ntsws ntawm cov qhob li 30%. Ntxiv rau qhov kev hloov pauv dawb, ntau cov tswv yim kuj tau siv los kawm txog kev cuam tshuam ntawm cov fibers ntawm kev txiav txim siab. Qhov sib ntxiv ntawm cov fibers yog tsuas yog siv los hloov qhov dav thiab ntev ntawm shrinkage tawg nyob rau hauv cov pob zeb tawg hauv av. Cov kev tshawb fawb txog cov lus xaus yog kwv yees li nram qab no.
1. Cov ntaub ntawv fiber ntau thiab hom muaj kev cuam tshuam zoo ntawm shrinkage tawg. Rau tib lub ntim ntawm cov ntsiab lus fiber ntau, cov fiber ntau yog qhov ua tau zoo tshaj plaws inhibiting kev loj hlob, ua raws los ntawm cov khoom hluavtaws fiber.
2. Rau qhov muab cov fiber ntau ntim feem thiab cov hom fiber ntau, me dua- txoj kab uas hla tau zoo dua li luv dua, thicker fibers; Fibers nrog ntau dua ntawm cov duab geometric deformation ntawm cov npoo muaj txiaj ntsig zoo dua li cov pej xeem undeformed.
3. Raws li rau cov nroj tsuag fibers, coated los yog uncoated fibers tsuas yog ua tau zoo thaum feem pua feem pua yog siab dua 0.3%.
Waterproof thiab ruaj khov
Precast qhob cheebtsam yog tus mob vim tias sulfuric acid nres, alkali kev sib cav, thiab corrosion sillica kev tawm tsam, thiab corrosion ntawm cov hlau tuav. Hauv tag nrho cov xwm txheej no, nkag mus rau qhov chaw nres tsheb loj me me. Lub zog ntawm precast cov khoom lag luam nyob ntawm tus nqi ntawm cov dej ntawm cov dej intrusion / nkag mus. Cov txiaj ntsig qhia tau tias dej permeability, nyob rau hauv lem, nyob ntawm cov kab nrib pleb hauv cov pob zeb ua kom tawg yuav ua rau muaj kev sib tsoo siab dua. Kev Siv Fuab Fiber dua txhim kho cov pob zeb tawg ua, nce tawg pleb Raws li rau kev ntxhov siab thiab kev ntxhov siab {- indicter ua kom tawg ua kom muaj fiber ntau dua yog qhov qis dua li ntawm cov pob zeb ua kom qis dua. Raws li rau yuav ua li cas cov fibers txhim kho dej tsis kam, kev tshawb fawb tau pom tias cov micropores hauv cov pob zeb ua tau hloov pauv mus rau qhov sib ntxiv ntawm cov fibers.
Rebar corrosion nyob rau hauv precast pob zeb ua yog teeb meem tseem ceeb. Cov tshuaj chloride hauv av yog qhov tseem ceeb tshaj plaws, thiab cov txheej txheem thiab cov txheej txheem uas nws corrodes cov hlau tau to taub zoo. Hmoov tsis zoo, kab nrib pleb hauv cov qhob tso cai rau chloride ions thiab lwm yam tshuaj muaj tshuaj kom tau nkag mus tau yooj yim dua, yog li txhawb kev corrosion ntxiv. Chloride ions diffuse feem ntau los ntawm cov dej hauv kev nkag mus, thaum cov tshuaj chloride diffusion feem ntau yog nyob ntawm dej permeability.
