Mechanical Properties uye Kukundikana Mechanisms yeFiber-Yakasimbiswa Kongiri: Kupesvedzera kweFiber Type uye Zvirimo.

Concrete ndiyo inonyanya kushandiswa Kuvaka zvinhu. Inopa akawanda mabhenefiti, kusanganisira kuwanikwa kwayo kwakawanda, nyore kugadzira maitiro, mutengo wakaderera, uye nyore kushandisa. Inoshandiswa zvakanyanya munzvimbo dzakasiyana siyana sezvivakwa, migwagwa, mabhiriji, tunnel, uye hydraulic engineering. Sezvo huwandu hukuru hwemapurojekiti einjiniya akagadzirwa, izvo zvinodikanwa pakuita kwekongiri zvakawedzerawo zvishoma nezvishoma. Nekuda kweizvozvo, kuperevedza kwekongiri yechinyakare, senge kusakwana kwekusimba kwesimba, kushomeka kwekushomeka kwecrack, uye kusagadzikana kwevhoriyamu, zvave pachena. Naizvozvo, kuvandudza mashandiro ekongiri kwagara kuri imwe yeakakosha nzira dzekutsvagisa muhurumende engineering.

Kuti uwedzere kuita kwekongiri, mafiibhi anowanzo wedzerwa kuti avandudze maitiro ayo emuchina uye kuoma. Mienzaniso inosanganisira Simbi Fibers (SF), michina yekugadzira (senge polypropylene fibers), mineral fibers (yakadai sebasalt fibers - BF), uye carbon fibers (CF). Iyi nzira yakawedzera kuwedzera kushanda kwekongiri yepamusoro (HPC) uye yekupedzisira-yepamusoro-soro kongiri (UHPC).

Fibers dzinogona, kusvika pamwero wakati, kuvandudza ma mechanic properties yekongiri. Nekudaro, akasiyana faibha mhando uye zviri mukati zvinotungamira mukusiyana kwakakura mukukanganisa kwavo pane kongiri yemichina. Parizvino, iyo yakakwana fiber yemukati, hukama hwehuwandu pakati peakakodzera paramita uye michina zvivakwa, uye ari pasi pematanho efiber-reinforced kongiri achiri kuda kumwe kujekeswa. Ichi chidzidzo chakaongorora carbon fibers (CF), basalt fibers (BF), uye simbi fibers (SF) sezvidzidzo zvekutsvagisa, kugadzirira kongiri zvienzaniso zvine zvakasiyana-siyana fiber zviri mukati. Aya mafiber akasarudzwa nekuda kweawo akanyorwa-akanyatso kukwidziridzwa kwekuita mukongiri uye kushandiswa kwakapararira. Kuburikidza nemiedzo inodzorwa yakasiyana-siyana, mhedzisiro yemhando yefiber uye zvirimo pasimba rekumanikidza, elastic modulus, uye kutadza maitiro ekongiri zvakaongororwa zvakarongeka. Kubatanidza mufananidzo wedhijitari uye scanning electron microscopy (SEM) maitiro ekuongorora, maitiro ekushanduka-shanduka kwefiber-yakasimbiswa kongiri panguva yekuyedza yakaonekwa, zvichitungamira kune zvinotevera mhedziso:

1.Kuenzaniswa nekongiri yakajairika (PC), kubatanidzwa kwesimbi fibers (SF), carbon fibers (CF), uye basalt fibers (BF) yakawedzera zvakanyanya mashandiro emagetsi efiber-reinforced kongiri (FRC) uye yakachinja maitiro ayo ekutadza. Aya mafiber akachinja kongiri kusimba uye kwekutanga pore compression maitiro. Sezvo fiber yemukati yakawedzera, iyo yekukundikana modhi yakashanduka kubva kune brittle kuenda kune ductile. Iyo yakakosha shanduko nzvimbo yaive 0.5% yesimbi fiber kongiri (SFC) uye 1.0% kune ese kabhoni fiber kongiri (CFC) uye basalt fiber kongiri (BFC). Kuti uwedzere kuita kwemechanical, iyo yakakwana yezvinyorwa zvesimbi fibers yaive 2.0%, yekabhoni fibers 1.0%, uye yebasalt fibers 0.5%.

2.Kunyange zvazvo fiber inogadzirisa inogona kuvandudza kuwirirana uye kutakura simba rekrete, zvakanyanyisa zvinyorwa zvepamusoro zvinogona kutungamirira ku "saturation" chiitiko, zvichiita kuti fiber "agglomeration." Izvi zvinokanganisa zvimiro zvekongiri, simba, uye deformation maitiro. Simbi faibha kongiri yakawana kushanda kwakaringana pachidimbu chefiber volume chikamu che2.0%, ukuwo kabhoni faibha kongiri uye basalt faibha kongiri zvakasvika pakuita kwavo kwakaringana pa1.0% ne0.5%, zvichiteerana. Kupfuura izvi zvemukati zvemukati, kuita kwakadzikira.

3.Scanning Electron Microscopy (SEM) kuongororwa kwakaratidza kuti kuwirirana kwepakati pakati pefibers uye cementitious matrix inokanganisa zvakanyanya macroscopic mechanical properties yekrete. Huwandu hwakakodzera hwefiber hunoumba yakaonda matatu-dimensional network chimiro mukati mekongiri, inosimudzira kubatana kwematrix uye kuita kwese. Nekudaro, yakawandisa yakakwira fiber yemukati inotungamira kune fiber agglomeration, ichigadzira isina kusimba nzvimbo dzemukati uye kuderedza density uye simba rekongiri. Shanduko dze microstructure dzaienderana zvakanyanya nekushanduka kwe macroscopic mechanical properties.

4.Kuwedzerwa kwefibers zvakanyanya kuchinja nzira yekukundikana kwekrete. Kana ichienzaniswa nekongiri isina kujeka, kongiri yakasimbiswa-fiber yakaratidza kutendeseka kwepamusoro mushure mekutadza, nekutsemuka kushoma uye kudiki, uye kusimba kwakawedzera. Simbi fibers yainyanya kushanda mucrack inhibition, ichiteverwa necarbon fibers uye basalt fibers. Iyo "bridging effect" yemafayibha yakaita basa rakakosha mukudzvanya kupararira kwekuputika, nepo "weak interface effect" yakakanganisa zvinhu zvemuchina.