Hunhu hweMichina uye Nzira Dzekukundikana dzeKonkriti Yakasimbiswa neFiber: Simba reRudzi rweFiber uye Zviri Mukati

Konkriti ndiyo inonyanya kushandiswa Kuvaka zvinhu. Inopa mabhenefiti akawanda, anosanganisira kuwanikwa kwayo kwose kwose, nzira iri nyore yekugadzira, mutengo wakaderera, uye nyore kushandisa. Inoshandiswa zvakanyanya munzvimbo dzakasiyana-siyana dzakadai sezvivakwa, migwagwa, mabhiriji, matunnel, uye hydraulic engineering. Sezvo mapurojekiti akawanda einjiniya akawedzera, kudiwa kwekushanda kwekongiri kwakawedzerawo zvishoma nezvishoma. Nekuda kweizvozvo, zvikanganiso zvekongiri yechinyakare, zvakaita sekushaya simba rekusimba, kusagona kupwanyika zvakanaka, uye kusagadzikana kwehuwandu, zvave pachena. Naizvozvo, kuvandudza mashandiro ekongiri kwagara kuri imwe yenzira huru dzekutsvaga muinjiniya yezvekuvaka.

Kuti kongiri ishande zvakanaka, fibers dzinowanzo wedzerwa kuti dzivandudze hunhu hwayo hwemakanika uye kusimba kwayo. Mienzaniso inosanganisira: Fiber yeSimbis (SF), mafiber ekugadzira (akaita semafiber epolypropylene), mafiber emineral (akadai semafiber ebasalt - BF), uye mafiber ecarbon (CF). Maitiro aya akawedzera kushanda kwekongiri yepamusoro (HPC) uye kongiri yepamusoro-soro (UHPC).

Mafiber anogona, kusvika pamwero wakati, kuvandudza hunhu hwemakemikoro ekongiri. Zvisinei, mhando dzakasiyana dzefiber nezviri mukati zvinotungamira mukusiyana kukuru mukukanganisa kwadzo pahunhu hwemakemikoro ekongiri. Parizvino, huwandu hwefiber hwakakodzera, hukama hwehuwandu pakati pemaparameter akakodzera uye hunhu hwemakemikoro, uye mashandiro ari pasi pekongiri yakasimbiswa nefiber zvichiri kuda kujekeswa zvakanyanya. Chidzidzo ichi chakaongorora mafiber ecarbon (CF), shinda dzebasalt (BF), uye fiber dzesimbi (SF) sevanhu vari kutsvagurudza, vachigadzira sampuli dzekongiri dzine fiber dzakasiyana-siyana. Fiber idzi dzakasarudzwa nekuda kwekuvandudzwa kwadzo mukushanda kwekongiri uye kushandiswa kwakapararira. Kuburikidza nekuyedza kwakadzorwa, mhedzisiro yemhando yefiber uye zviri mukati pasimba rekumanikidza, elastic modulus, uye fail mode yekongiri zvakaongororwa zvakarongeka. Kubatanidza matekiniki ekuongorora edhijitari uye scanning electron microscopy (SEM), maitiro ekushanduka kwekongiri yakasimbiswa nefiber panguva yekuyedza akaonekwa, zvichitungamira kumhedzisiro inotevera:

1. Zvichienzaniswa nekongiri yakajairika (PC), kubatanidzwa kwesimbi (SF), kabhoni (CF), uye shinda dzebasalt (BF) yakawedzera zvakanyanya hunhu hwekongiri yakasimbisirwa fiber (FRC) uye yakachinja maitiro ayo ekukundikana. Mafayibha aya akachinja kusimba kwekongiri uye hunhu hwekutanga hwekumanikidzwa kwepore. Sezvo huwandu hwefayibha hwakawedzera, maitiro ekukundikana akachinja kubva pakuoma kuenda ku ductile. Nzvimbo yakakosha yekuchinja yaive 0.5% yekongiri yesimbi fiber (SFC) uye 1.0% yekongiri yecarbon fiber (CFC) uye kongiri yebasalt fiber (BFC). Kuti zviwedzere kushanda kwekongiri, huwandu hwakanakisa hwefayibha dzesimbi hwaive 2.0%, hwefayibha dzekabhoni 1.0%, uye hwefayibha dzebasalt 0.5%.

2.Kunyangwe huwandu hwefaibha huchigona kuvandudza kusimba kwekongiri uye kugona kwayo kuberekera, huwandu hwakawandisa hunogona kukonzera "kuguta", zvichikonzera "kuungana" kwefaibha. Izvi zvinokanganisa zvakanyanya hunhu hwekongiri, simba rayo, uye hunhu hwayo hwekushanduka. Kongiri yefaibha yesimbi yakawana kushanda kwakanakisa pachikamu chefaibha che2.0%, nepo kongiri yefaibha yecarbon nekongiri yebasalt yakasvika pakushanda kwadzo kwakanakisa pa1.0% ne0.5%, zvichiteerana. Pamusoro pehuwandu hwayo hwakanakisa, kushanda kwakaderera.

3. Kuongorora kweElectron Microscopy (SEM) kwakaratidza kuti kubatana kwepakati pemafibers ne cementitious matrix kunokanganisa zvakanyanya hunhu hwema macroscopic mechanical hwekongiri. Huwandu hwakakodzera hwemafibers hunogadzira chimiro che network chakasimba chemativi matatu mukati mekongiri, zvichiwedzera kubatana kwe matrix uye kushanda kwayo kwese. Zvisinei, huwandu hwakawanda hwefiber hunotungamira ku fiber agglomeration, zvichigadzira nzvimbo dzisina kusimba dze interfacial uye kuderedza density uye simba rekongiri. Shanduko mu microstructure dzaienderana zvakanyanya nekushanduka kwehunhu hwema macroscopic mechanical.

4. Kuwedzerwa kwemafaibha kwakachinja zvakanyanya maitiro ekukundikana kwekongiri. Kana ichienzaniswa nekongiri isina chinhu, kongiri yakasimbiswa nefaibha yakaratidza kusimba kwakanyanya mushure mekukundikana, ine mitswe mishoma uye yakamanikana, uye kusimba kwakawedzerwa. Faibha dzesimbi dzaive dzakanyanya kushanda mukudzivirira mitswe, dzichiteverwa nemafaibha ekabhoni nemafaibha ebasalt. "Bridgeging effect" yemafaibha yakaita basa rakakosha mukudzivisa kupararira kwemitswe, nepo "weak interface effect" yaive nemhedzisiro yakaipa pahunhu hwemakanika.