Polymer Reinforcement

GFRP Rebar

I-Glass Fiber Reinforced Polymer (GFRP) rebar iyimathiselwano engavela phakathikazulu eyakhiwe ngama-fiber e-glass aqhubekayo afakwe ku-epoxy noma ku-polyester resin matrix. Ngokuphambene nezinsimbi ezijwayelekile, i-GFRP rebar inikeza ukuvikelwa okungcono kokrust, okwenza kube iyinhloko ebalulekile kwezokwakha izisekelo ezijulile kanye nezobunjiniyela bekhonkco lapho ukusebenza nokwakhiwa okwempilo kuhlobene kakhulu. Ubukhulu bokukhanya bomkhiqizo—cishe ingxenye eyodwa ye-densiti yesitimela—buvumela izinzuzo ezinkulu zokuqhuba izimpahla lapho kugcinwa amandla afanayo wokuqina ezinhlelweni eziningi. Emsebenzini wezisekelo ezijulile, i-GFRP rebar ibalulekile ekuqineni ama-pile caps, ama-caissons, nezakhiwo zamawalladi e-diaphragm ezingexhumene nomhlaba onobungozi nasemanzini. Lo mkhiqizo ubonakala kakhulu ezindaweni zokungena kwamanzi amsalela, ezimweni zamathafa anokwakhiwa okungavamile, nasezindaweni ezithinteka kakhulu kumachloride lapho umkhiqizo wensimbi ojwayelekile uhlangabezana nokrust okukhandwa phambili. I-GFRP reinforcement iphinde icaciswe ezihlanganweni zokuthuthukiswa komhlaba, kuhlanganisa izinhlaka zokuzinza komhlabathi, okwenziwayo, nezinhlelo zokukhuthaza ezihlanganisayo ezimweni zomhlaba ezithambile noma eziphakeme. Ekwakhiweni kwemidwebo yokugcina—nokwenza okwesikhashana nokwenze okwakho okwenziwa njalo—i-GFRP rebar inikeza ukuqina okwandisiwe ezindaweni ezingaphansi komhlaba, emathafeni okuphuma kwamanzi, nakwezinye izakhiwo ezizungezile ekusetshenzisweni kwemikhono yokuhlanza. I-GFRP rebar ivamise ukunikezwa ngezolimi noma ngamabhakede aqondile aphakathi kuka-10 kuya ku-15 meters, ngama-diameter ajwayelekile aphakathi kuka-6mm kuya ku-50mm (noma izimfuneko ezikhethekile ziyatholakala). Igcinwa ezimeni ezivikelwe ukuvikela ukugugulwa kwe-UV futhi ifuna ukuphathwa kahle ukuze kuvinjwe uk damage ebusweni okungase kube nomphumela omubi kumatrix resin. Ukufakwa endaweni kulandela izinqubo ezifanayo nezinjiyela zensimbi, nakuba izimfanelo ze-GFRP ezingenawo umphumela wokuxhumana kwe-elekthronikhi zikhulula ukukhathazeka kwamakamelo kagesi nokunciphisa ubungozi bokuphepha ngesikhathi sokubekwa eduze kwemigqa kagesi eyandisiwe. Lo mkhiqizo awudingi ukugqokwa kwe-epoxy noma izinyathelo zokuvikeleka zokuvikela ukuzenzakalelayo kokrust, kunciphisa ubunzima bezichasiso kanye nezindleko zomkhiqizo. Izincazelo ezivamile zama-GFRP rebar zihlanganisa izinhlobo ezisindiwe (ezithuthukisa ubudlelwane nokhonkco) kanye nezinhlobo eziphezulu, ngamasigaba ezimpawu ezintsha ezivamile zohlelo lwe-ASTM. Izinhlobo eziyinhloko zihluke kubunjiniyela bama-fiber, ngezinhlaka ezihamba phambili, ezivundlile, nezakhiwo zomkhakha omningi ezitholakalayo kuye ngama zidingo ezithwalo. Ochwepheshe kufanele bacabangele i-modulus encane ye-GFRP uma kuqhathaniswa nensimbi—cishe u-40–50% wombuso wensimbi—okudinga ama-diameter abanjwe esikhathini esithile noma ukwehlelwa eduze ukuze kuzuze ukufana kokuncintisana kwezinye izinhlelo. Izimfanelo zokuqhuba ze-GFRP zifaka amandla okusebenzisa (imvamisa u-600–1,200 MPa), amandla okwehlisa, ukusebenza kokubophela okhonkco, ukuhlola imvelaphi yokuhlala ngendlela, kanye nokuziphatha kwesikhathi eside okukhanyisa ngaphansi kwezithwalo ezibekiwe. Ukuklama kufanele kuwuphakamise futhi umkhiqizo kufanele uhlole ukusebenza okungokwenkqubo yokuhamba, ngaphandle komkhawulo wokuphepha wokuguquguquka kokwakhiwa okukhona kulayini, okuhlanganisa ukuzikhandla kakhulu kwezimali zokukhetha. Izinhlelo ze-GFRP zithonywa izindinganiso zomhlaba jikelele okuhlanganisa i-ASTM D7957 (Isimiso Esijwayelekile se-Solid Glass Fiber Reinforced Polymer Rebar), iziqondiso ze-ACI 440.1R ngokuqinisa kwe-FRP, uchungechunge lwe-EN 13121 lwezikhala ze-FRP rebar, kanye nezindinganiso ze-ISO 12474. Izinhlaka eziningi zikhombisa lezi ziqondiso phakathi kwemithetho yokwakha nezimo zobunjiniyela, ukuqinisekisa ikhwalithi yomkhiqizo esezingeni eliphezulu nokusebenza okwenziwe kahle emisebenzini yokwakha izisekelo ezijulile emhlabeni jikelele. Ochwepheshe abathuthukisa nge-GFRP kumele baqinisekise izitifiketi zomkhiqizo, bahlale befaka uhla lwabaphakeli ezindabeni ezisemthethweni, futhi baqinisekise ukuvumelana nezidingo zemvelo nezokwakha ezithile zamaphrojekthi.