Iimpawu zoomatshini kunye neendlela zokungaphumeleli kwekhonkrithi eqiniswe yiFiber: Impembelelo yohlobo lweFiber kunye nomxholo
Ikhonkrithi yeyona isetyenziswa kakhulu Ulwakhiwo izinto zokwakha. Inika iingenelo ezininzi, kuquka ukufumaneka kwayo ngokubanzi, inkqubo elula yokuvelisa, iindleko eziphantsi, kunye nokulula kokusetyenziswa. Isetyenziswa kakhulu kwiindawo ezahlukeneyo ezifana nezakhiwo, iindlela, iibhulorho, iitonela, kunye nobunjineli be-hydraulic. Njengoko inani elikhulu leeprojekthi zobunjineli liye laphuhliswa, iimfuno zokusebenza kwekhonkrithi nazo ziye zanda kancinci kancinci. Ngenxa yoko, ukusilela kwekhonkrithi yendabuko, njengokungoneli kwamandla okutsalwa, ukumelana nokuqhekeka okungalunganga, kunye nokungazinzi komthamo, kuye kwabonakala. Ke ngoko, ukuphucula ukusebenza kwekhonkrithi kuye kwaba yenye yeendlela eziphambili zophando kubunjineli bokwakha.
Ukuphucula ukusebenza kwekhonkrithi, imicu idla ngokongeza ukuphucula iimpawu zayo zoomatshini kunye nokuqina kwayo. Imizekelo ibandakanya Ifayibha yentsimbis (SF), iifayibha zokwenziwa (ezifana neefayibha zepolypropylene), iifayibha zeminerali (ezifana neefayibha zebasalt - BF), kunye neefayibha zekhabhoni (CF). Le ndlela iphucule ngakumbi ukusebenza kwekhonkrithi esebenza kakhulu (HPC) kunye nekhonkrithi esebenza kakhulu (UHPC).
Iifayibha, ngandlela ithile, zinokuphucula iipropati zekhonkrithi. Nangona kunjalo, iintlobo ezahlukeneyo zefayibha kunye nomxholo ngokungenakuphepheka zikhokelela kwiinguqu ezibalulekileyo kwimpembelelo yazo kwiimpawu zekhonkrithi. Okwangoku, umxholo wefayibha ofanelekileyo, ubudlelwane obuphakathi kweeparameter ezifanelekileyo kunye neepropati zekhonkrithi, kunye neendlela ezisisiseko zekhonkrithi eqinisiweyo yefayibha zisafuna ukucaciswa ngakumbi. Olu phononongo luphande iifayibha zekhabhoni (CF), imicu ye-basalt (BF), kunye neefayibha zentsimbi (SF) njengezifundo zophando, zilungiselela iisampulu zekhonkrithi ezineefayibha ezahlukeneyo. Ezi fayibha zikhethwe ngenxa yokuphuculwa kokusebenza kwazo okubhalwe kakuhle kwikhonkrithi kunye nokusetyenziswa okubanzi. Ngokusebenzisa iimvavanyo eziguquguqukayo ezilawulwayo, iziphumo zohlobo lwefayibha kunye nomxholo kumandla okuxinzelela, i-elastic modulus, kunye nendlela yokusilela kwekhonkrithi zihlalutywe ngokucwangcisiweyo. Ukudibanisa iindlela zohlalutyo lwedijithali kunye ne-scanning electron microscopy (SEM), ukuziphatha kokuguquka kwekhonkrithi eqiniswe yifayibha ngexesha lovavanyo kubonwe, okukhokelela kwizigqibo ezilandelayo:
1. Xa kuthelekiswa nekhonkrithi eqhelekileyo (PC), ukufakwa kweefayibha zentsimbi (SF), iifayibha zekhabhoni (CF), kunye imicu ye-basalt (BF) yaphucula kakhulu iipropati zoomatshini zekhonkrithi eqinisiweyo yefayibha (FRC) yaza yatshintsha indlela yayo yokusilela. Ezi fayibha zatshintsha ubuncinci bekhonkrithi kunye neempawu zokuqala zokucinezelwa kwepore. Njengoko umxholo wefayibha wawusanda, indlela yokusilela yatshintsha ukusuka ekubeni buthathaka ukuya kwi-ductile. Indawo ebalulekileyo yokutshintsha yayiyi-0.5% kwikhonkrithi yefayibha yentsimbi (SFC) kunye ne-1.0% kwikhonkrithi yefayibha yecarbon (CFC) kunye nekhonkrithi yefayibha yebasalt (BFC). Ukuze kuphuculwe ukusebenza koomatshini, umxholo ofanelekileyo kwifayibha yentsimbi yayiyi-2.0%, kwifayibha yecarbon yi-1.0%, nakwifayibha yebasalt yi-0.5%.
2. Nangona umxholo wefayibha unokuphucula ubuncinci kunye nomthamo wokuthwala wekhonkrithi, umxholo ophezulu kakhulu unokukhokelela kwisiganeko "sokugcwala", okubangela "ukuhlanganiswa kwefayibha." Oku kuchaphazela kakubi iipropati zomzimba zekhonkrithi, amandla, kunye neempawu zokuguquka. Ikhonkrithi yefayibha yentsimbi ifumene ukusebenza okuphezulu kwinxalenye yomthamo wefayibha ye-2.0%, ngelixa ikhonkrithi yefayibha yekhabhoni kunye nekhonkrithi yefayibha yebasalt ifikelele ekusebenzeni kwayo okuphezulu kwi-1.0% kunye ne-0.5%, ngokulandelelana. Ngaphaya kwezi zinto zilungileyo, ukusebenza kwehla.
3. Uhlalutyo lwe-Scanning Electron Microscopy (SEM) lubonise ukuba unxibelelwano oluphakathi kweefayibha kunye ne-cementitious matrix luchaphazela kakhulu iipropati ze-macroscopic mechanical zekhonkrithi. Ubungakanani obufanelekileyo beefayibha benza isakhiwo senethiwekhi esixineneyo esinemilinganiselo emithathu ngaphakathi kwekhonkrithi, nto leyo ephucula uqhagamshelo lwe-matrix kunye nokusebenza kwayo iyonke. Nangona kunjalo, umxholo wefayibha ophezulu kakhulu ukhokelela kwi-fiber agglomeration, nto leyo edala iindawo ezibuthathaka ze-interfacial kwaye inciphisa uxinano kunye namandla ekhonkrithi. Utshintsho kwi-microstructure beluhambelana kakhulu nokuguquka kweempawu ze-macroscopic mechanical.
4. Ukongezwa kweefayibha kuyitshintshe kakhulu indlela yokusilela kwekhonkrithi. Xa kuthelekiswa nekhonkrithi ecacileyo, ikhonkrithi eqiniswe ngefayibha ibonakalise ukuthembeka okuphezulu emva kokusilela, ineemifantu ezimbalwa nezincinci, kunye nokuqina okuphuculweyo. Iifayibha zentsimbi bezisebenza kakhulu ekuthinteleni iimfantu, zilandelwa ziifayibha zekhabhoni kunye neefayibha zebasalt. "Isiphumo sokubhida" seefayibha sidlale indima ebalulekileyo ekuthinteleni ukwanda kweemfantu, ngelixa "isiphumo sokusebenzisana esibuthathaka" sinempembelelo embi kwiimpawu zoomatshini.
