Thepa ea Mechini le Mekhoa e Hloekileng ea Konkreite e Matlafalitsoeng ka Fiber: Tšusumetso ea Mofuta oa Fiber le Likahare.
Konkreite ke eona e sebelisoang ka ho fetisisa Kaho thepa. E fana ka melemo e mengata, ho kenyelletsa ho fumaneha ha eona hohle, ts'ebetso e bonolo ea tlhahiso, litšenyehelo tse tlase, le boiketlo ba ts'ebeliso. E sebelisoa haholo mafapheng a fapaneng joalo ka meaho, litsela, marokho, lithanele le boenjiniere ba hydraulic. Ha palo e kholo ea merero ea boenjiniere e ntse e tsoela pele, litlhoko tsa ts'ebetso ea konkreite le tsona li eketsehile butle-butle. Ka lebaka leo, mefokolo ea konkreite ea setso, joalo ka matla a sa lekaneng a ho tiea, khanyetso e fokolang ea crack, le ho se tsitse ha molumo, li se li totobala. Ka hona, ho ntlafatsa ts'ebetso ea konkreite esale e le e 'ngoe ea litsela tsa bohlokoa tsa lipatlisiso ho boenjiniere ba sechaba.
Ho matlafatsa ts'ebetso ea konkreite, likhoele hangata li eketsoa ho ntlafatsa thepa ea eona ea mochini le ho tiea. Mehlala e kenyeletsa Fiber ea tšepes (SF), likhoele tsa maiketsetso (joaloka likhoele tsa polypropylene), likhoele tsa diminerale (joalo ka likhoele tsa basalt - BF), le likhoele tsa carbon (CF). Mokhoa ona o matlafalitse ts'ebetso ea konkreite ea ts'ebetso e phahameng (HPC) le konkreite e phahameng haholo (UHPC).
Li-fibers, ho isa bohōleng bo itseng, li ka ntlafatsa thepa ea konkreite. Leha ho le joalo, mefuta e fapaneng ea likhoele le likahare li lebisa ho phapano e kholo tšusumetsong ea tsona mekhoeng ea mochini oa konkreite. Hajoale, boleng bo nepahetseng ba fiber, kamano ea bongata lipakeng tsa liparamente tse amehang le thepa ea mochini, le mekhoa ea motheo ea konkreite e matlafalitsoeng ka fiber e ntse e hloka tlhaloso e eketsehileng. Phuputso ena e ile ea etsa lipatlisiso ka carbon fibers (CF), likhoele tsa basalt (BF), le likhoele tsa tšepe (SF) joalo ka lithuto tsa lipatlisiso, ho lokisa mehlala ea konkreite e nang le likahare tse fapaneng tsa fiber. Likhoele tsena li khethiloe ka lebaka la ntlafatso ea ts'ebetso e ngotsoeng hantle ka konkreite le ts'ebeliso e atileng. Ka liteko tse feto-fetohang tse laoloang, litlamorao tsa mofuta oa fiber le likahare ho matla a khatello, modulus ea elastic, le mokhoa oa ho hloleha oa konkreite li ile tsa hlahlojoa ka mokhoa o hlophisehileng. Ho kopanya setšoantšo sa dijithale le mekhoa ea tlhahlobo ea electron microscopy (SEM), ho ile ha hlokomeloa boits'oaro ba phetoho ea crack ea konkreite e matlafalitsoeng nakong ea liteko, e lebisang ho liqeto tse latelang:
1.Ha e bapisoa le konkreite e tloaelehileng (PC), ho kenngoa ha likhoele tsa tšepe (SF), carbon fibers (CF), le likhoele tsa basalt (BF) e ntlafalitse haholo thepa ea mochini oa konkreite e matlafalitsoeng (FRC) mme e fetotse mokhoa oa eona oa ho hloleha. Likhoele tsena li fetotse ho momahana ha konkreite le litšoaneleho tsa pele tsa ho petetsa pore. Ha fiber e ntse e eketseha, mokhoa oa ho hlōleha o ile oa fetoha ho tloha ho brittle ho ea ho ductile. Ntho ea bohlokoa ea phetoho e ne e le 0.5% bakeng sa konkreite ea fiber ea tšepe (SFC) le 1.0% bakeng sa konkreite ea carbon fiber (CFC) le basalt fiber concrete (BFC). Ho eketsa ts'ebetso ea mochini, boleng bo nepahetseng bakeng sa likhoele tsa tšepe e ne e le 2.0%, bakeng sa likhoele tsa carbon 1.0%, le tsa basalt fibers 0.5%.
2.Le hoja lihlahisoa tsa fiber li ka ntlafatsa compactness le ho jara matla a konkreite, lintho tse ngata tse phahameng li ka lebisa ho "saturation" ketsahalo, e bakang fiber "agglomeration." Sena se ama hampe thepa ea 'mele ea konkreite, matla, le litšobotsi tsa deformation. Konkreite ea fiber ea tšepe e fihletse ts'ebetso e nepahetseng ka karolo ea 2.0% ea fiber fiber, athe carbon fiber concrete le basalt fiber concrete li fihletse ts'ebetso ea tsona e nepahetseng ho 1.0% le 0.5%, ka ho latellana. Ntle le litaba tsena tse nepahetseng, ts'ebetso e fokotsehile.
3.Scanning Electron Microscopy (SEM) tlhahlobo e senoletse hore tlamahano ea sefahleho pakeng tsa likhoele le matrix ea cementitious e susumetsa haholo thepa ea macroscopic ea konkreite. Palo e loketseng ea likhoele e theha sebopeho sa marang-rang se nang le mahlakore a mararo ka har'a konkreite, se matlafatsang khokahanyo ea matrix le ts'ebetso ka kakaretso. Leha ho le joalo, fiber e ngata haholo e lebisa khokahanyong ea fiber, ho theha libaka tse fokolang tsa sefahleho le ho fokotsa ho teteana le matla a konkreite. Liphetoho tsa microstructure li ne li lumellana haholo le ho iphetola ha thepa ea macroscopic ea mechine.
4.Ho eketsoa ha likhoele ho fetotse haholo mokhoa oa ho hloleha oa konkreite. Ha ho bapisoa le konkreite e hlakileng, konkreite e matlafalitsoeng ka fiber e bonts'itse botšepehi bo phahameng ka mor'a ho hloleha, ka mapetsong a fokolang le a fokolang, le ho tiea ho matlafalitsoeng. Likhoele tsa tšepe li ne li sebetsa ka ho fetisisa ho thibela crack, li lateloa ke likhoele tsa carbon le tsa basalt. "Phello ea borokho" ea likhoele e phethile karolo ea bohlokoa ho hatelleng ho ata ha crack, athe "tlaase e fokolang ea sebopeho" e bile le phello e mpe ho thepa ea mochini.
