1. Steel Fiber Reinforced Concrete
Tsis muaj steel fiber ntau yog muaj raws li kev txhawb nqa.Round steel fiber ntau hom siv yog tsim los ntawm kev txiav cov hlau nyob rau hauv kom luv luv.Txoj kab uas hla yog nyob rau hauv thaj tsam ntawm 0.25 txog 0.75mm.Cov hlau fibers uas muaj cov duab plaub c/s yog tsim los ntawm silting cov nplooj ntawv txog 0.25mm tuab.
Fiber ua los ntawm me me hlau kos hlau.Ua raws li IS: 280-1976 nrog txoj kab uas hla ntawm cov xaim sib txawv ntawm 0.3 txog 0.5mm tau siv hauv Is Nrias teb.
Round steel fibers yog tsim los ntawm kev txiav los yog chopping cov hlau, tiaj daim ntawv fibers muaj ib tug raug c / s xws li los ntawm 0.15 mus rau 0.41mm nyob rau hauv thickness thiab 0.25 mus rau 0.90mm nyob rau hauv dav yog tsim los ntawm silting ca nplooj ntawv.
Deformed fiber, uas yog xoob bounded nrog dej-soluble kua nplaum nyob rau hauv daim ntawv ntawm ib pob kuj muaj.Txij li thaum ib tus neeg fibers zoo li pawg ua ke, lawv cov kev faib tawm tsis sib xws hauv matrix feem ntau nyuaj.Qhov no tej zaum yuav zam tau los ntawm kev ntxiv fibers bundles, uas cais thaum lub sij hawm sib tov.
2. Polypropylene Fiber Reinforced (PFR) cement mortar thiab pob zeb
Polypropylene yog ib qho ntawm cov pheej yig tshaj & abundantly muaj polymers polypropylene fibers yog resistant rau feem ntau cov tshuaj & nws yuav yog cementitious matrix uas yuav deteriorate thawj zaug nyob rau hauv aggressive tshuaj tua.Nws melting point yog siab (kwv yees li 165 degrees centigrade).Yog li ua haujlwm temp.Raws li (100 degree centigrade) tuaj yeem txhawb nqa rau lub sijhawm luv luv yam tsis muaj kev cuam tshuam rau cov khoom fiber ntau.
Polypropylene fibers ua hydrophobic tuaj yeem sib xyaw tau yooj yim vim lawv tsis xav tau kev sib cuag ntev thaum sib xyaw thiab tsuas yog yuav tsum tau sib npaug sib npaug hauv kev sib xyaw.
Polypropylene luv fibers nyob rau hauv me me ntim feem ntawm 0.5 mus rau 15 coj mus muag siv nyob rau hauv pob zeb.
Fig.1: Polypropylene fiber reinforced cement-mortar thiab pob zeb
3. GFRC – iav Fiber Reinforced Concrete
Cov iav fiber ntau yog tsim los ntawm 200-400 tus neeg filaments uas sib sib zog nqus ua kom sawv ntsug.Cov chaw no tuaj yeem raug txiav mus rau ntau qhov ntev, los yog ua ke los ua daim ntaub lev lossis daim kab xev.Siv cov txheej txheem sib xyaw ua ke rau ib txwm ua vaj tse nws tsis tuaj yeem sib tov ntau tshaj li 2% (los ntawm ntim) ntawm fibers ntawm qhov ntev ntawm 25mm.
Cov khoom siv tseem ceeb ntawm cov iav fiber ntau tau ntxiv dag zog rau cov cement lossis mortar matrices siv los ua cov khoom nyias nyias.Feem ntau siv cov iav fibers yog e-iav siv.Nyob rau hauv lub zog ntawm cov yas & AR iav E-iav muaj qhov tsis txaus tiv thaiv alkalis tam sim no hauv Portland MAAs qhov twg AR-iav tau txhim kho alkali resistant yam ntxwv.Qee lub sij hawm cov polymers kuj tau ntxiv rau hauv cov khoom sib tov los txhim kho qee lub cev xws li kev txav mus los.
Fig.2: iav-fiber reinforced pob zeb
4. Asbestos Fibers
Cov khoom muaj nqis pheej yig, asbestos, tau ua tiav nrog Portland cement paste los tsim cov khoom siv dav hu ua asbestos cement.Asbestos fibers ntawm no thermal mechanical & tshuaj tiv thaiv ua rau lawv haum rau cov ntawv cov khoom kav, vuas thiab corrugated ru tsev ntsiab.Asbestos cement board yog kwv yees li ob los yog plaub npaug ntawm cov khoom siv tsis muaj zog.Txawm li cas los xij, vim qhov luv luv (10mm) fiber ntau muaj qhov cuam tshuam tsis zoo.
Fig.3: Asbestos fiber ntau
5. Cov pa roj carbon fibers
Cov pa roj carbon fiber ntau los ntawm qhov tsis ntev los no & qhov tshwm sim qhov zoo tshaj plaws ntxiv rau qhov ntau ntawm fiber ntau muaj rau kev lag luam siv.Carbon fiber los nyob rau hauv lub siab heev modulus ntawm elasticity thiab flexural zog.Cov no yog nthuav.Lawv lub zog & nruj cov yam ntxwv tau pom tias zoo dua txawm tias cov hlau.Tab sis lawv muaj kev pheej hmoo ntau dua rau kev puas tsuaj ntau dua li cov iav fiber ntau, thiab yog li feem ntau raug kho nrog cov txheej txheem tawm haujlwm.
Fig.4: Carbon fibers
6. Organic Fibers
Organic fiber xws li polypropylene los yog ntuj fiber ntau tej zaum yuav chemically inert ntau dua li cov hlau los yog iav fibers.Lawv kuj pheej yig dua, tshwj xeeb tshaj yog yog ntuj.Ib lub ntim loj ntawm cov zaub fiber ntau yuav siv tau kom tau txais ntau qhov sib xyaw ua ke.Qhov teeb meem ntawm kev sib xyaw thiab kev tsis sib haum xeeb tuaj yeem daws tau los ntawm kev ntxiv ib qho superplasticizer.
Fig.5: Organic fiberr
Post lub sij hawm: Lub Xya hli ntuj-23-2022