IiPropati zoomatshini kunye neeNdlela zokuSilela zeFiber-Eyomelezwe ngeConcrete: impembelelo yoHlobo lweFayibha kunye noMxholo.
Ikhonkrithi yeyona isetyenziswa kakhulu Ukwakhiwa impahla. Ibonelela ngeenzuzo ezininzi, kubandakanywa ukufumaneka kwayo ngokubanzi, inkqubo elula yokuvelisa, ixabiso eliphantsi, kunye nokulula kwesicelo. Isetyenziswa kakhulu kwiinkalo ezahlukeneyo ezifana nezakhiwo, iindlela, iibhulorho, iitonela, kunye nobunjineli behydraulic. Njengoko inani elikhulu leeprojekthi zobunjineli ziye zaphuhliswa, iimfuno zokusebenza kwekhonkrithi ziye zanda kancinci kancinci. Ngenxa yoko, iziphene zekhonkrithi yesiqhelo, ezifana nokungonelanga kokuqina, ukunganyangeki kakuhle kwee-crack, kunye nokungazinzi komthamo, kuye kwabonakala. Ke ngoko, ukuphuculwa kokusebenza kwekhonkrithi kuye kwaba lelona khokelo lophando luphambili kubunjineli boluntu.
Ukomeleza ukusebenza kwekhonkrithi, iintsinga ziye zongezwa ukuphucula iipropathi zayo zomatshini kunye nokuqina. Imizekelo ibandakanya IFayibha yentsimbis (SF), iifayili zokwenziwa (njengee-polypropylene fibers), iifiber zamaminerali (ezifana ne-basalt fibers - BF), kunye ne-carbon fibers (CF). Le ndlela iye yomeleza ngakumbi ukusebenza kwekhonkrithi ephezulu (HPC) kunye ne-ultra-high performance concrete (UHPC).
Iifayibha zinokuthi, kwinqanaba elithile, ziphucule iimpawu zomatshini zekhonkrithi. Nangona kunjalo, iintlobo zefayibha ezahlukeneyo kunye nemixholo ngokungathintelekiyo zikhokelela kutshintsho olubalulekileyo kwimpembelelo yazo kwiipropathi zomatshini zekhonkrithi. Okwangoku, owona mxholo wefiber ogqwesileyo, ubudlelwane bobungakanani phakathi kweeparamitha ezifanelekileyo kunye neempawu zomatshini, kunye neendlela ezisisiseko zekhonkrithi eyomeleziweyo zisafuna ukucaciswa ngakumbi. Olu phononongo luphande ngemicu yekhabhoni (CF), imicu yebasalt (BF), kunye neentambo zetsimbi (SF) njengezifundo zophando, ukulungiselela imizekelo yekhonkrithi enemixholo yefiber eyahluka-hlukeneyo. Ezi ntsinga zikhethwe ngenxa yokuphuculwa kwazo okubhalwe kakuhle kwikhonkrithi kunye nosetyenziso olubanzi. Ngokusebenzisa imifuniselo eguquguqukayo elawulwayo, iimpembelelo zohlobo lwefayibha kunye nomxholo kumandla oxinzelelo, imodulus elastic, kunye nemowudi yokungaphumeleli kwekhonkrithi yahlalutywa ngokucwangcisiweyo. Ukudibanisa umfanekiso wedijithali kunye nokuskena i-electron microscopy (SEM) ubuchule bokuhlalutya, indlela yokuziphatha kwe-crack evolution yekhonkrithi eyomeleziweyo ngexesha lovavanyo yabonwa, ekhokelela kwezi zigqibo zilandelayo:
1.Xa kuthelekiswa nekhonkrithi eqhelekileyo (i-PC), ukufakwa kweefayili zetsimbi (SF), i-carbon fibers (CF), kunye imicu yebasalt (BF) iphucule kakhulu iipropathi zemishini ye-fiber-reinforced concrete (FRC) kwaye yatshintsha indlela yokungaphumeleli kwayo. Ezi ntsinga zitshintshe ukubumbana kwekhonkrithi kunye neempawu zokuqala zokucinezelwa kwepore. Njengoko umxholo wefayibha usanda, indlela yokungaphumeleli yatshintsha ukusuka kwi-brittle ukuya kwi-ductile. Indawo ebalulekileyo yokutshintsha yayiyi-0.5% yekhonkrithi yentsimbi yentsimbi (SFC) kunye ne-1.0% yekhonkrithi ye-carbon fiber (CFC) kunye ne-basalt fiber concrete (BFC). Ukwandisa ukusebenza komatshini, umxholo ofanelekileyo weefayili zetsimbi wawuyi-2.0%, i-carbon fibers 1.0%, kunye ne-basalt fibers 0.5%.
I-2.Nangona umxholo wefiber unokuphucula ukudibanisa kunye nokuthwala umthamo wekhonkrithi, umxholo ophezulu ngokugqithiseleyo unokukhokelela kwinto ethi "saturation", ebangela i-fiber "agglomeration." Oku kunefuthe elibi kwiimpawu zomzimba zekhonkrithi, amandla, kunye neempawu zokuguquka. Ikhonkrithi ye-fiber yensimbi iphumelele ukusebenza ngokufanelekileyo kwi-fiber volume fraction ye-2.0%, ngelixa ikhonkrithi ye-carbon fiber kunye ne-basalt fiber concrete ifikelele ekusebenzeni kwayo okulungileyo kwi-1.0% kunye ne-0.5%, ngokulandelanayo. Ngaphandle kwale mixholo ilungileyo, ukusebenza kwehlile.
3.Uhlalutyo lwe-Electron Microscopy (SEM) lubonise ukuba i-interfacial bond phakathi kwee-fibers kunye ne-cementitious matrix ichaphazela kakhulu iimpawu ze-macroscopic mechanical zekhonkrithi. Isixa esifanelekileyo seentsinga senza ulwakhiwo oluxineneyo lothungelwano olunamacala amathathu ngaphakathi kwekhonkrithi, luphucula uqhagamshelwano lwematrix kunye nokusebenza ngokubanzi. Nangona kunjalo, umxholo wefiber ephezulu ngokugqithisileyo ukhokelela kwi-fiber agglomeration, ukudala imimandla ebuthathaka yobuso kunye nokunciphisa ukuxinana kunye namandla ekhonkrithi. Utshintsho kwi-microstructure lwaluhambelana kakhulu kunye nokuvela kweempawu ze-macroscopic mechanical.
4.Ukongezwa kweefibers kwatshintsha kakhulu indlela yokungaphumeleli kwekhonkrithi. Xa kuthelekiswa nekhonkrithi engenanto, ikhonkrithi eyomelezwe ngefayibha ibonise imfezeko ephezulu emva kokungaphumeleli, kunye nokuqhekeka okumbalwa kunye nokucuthayo, kunye nokuqina okuphuculweyo. Iifiber zetsimbi zazisebenza kakhulu kwi-crack inhibition, elandelwa yi-carbon fibers kunye ne-basalt fibers. "Impembelelo yokuqhawula" yeentsinga idlale indima ebalulekileyo ekucinezeleni ukwanda kokuqhekeka, ngelixa "impembelelo yojongano olubuthathaka" ibe neempembelelo ezimbi kwiimpawu zoomatshini.
