Katundu Wamakina ndi Njira Zolephera za Konkire Yolimbitsa Ulusi: Mphamvu ya Mtundu wa Fiber ndi Zomwe zili.

Konkire ndi yomwe imagwiritsidwa ntchito kwambiri Zomangamanga zakuthupi. Imakhala ndi maubwino ambiri, kuphatikiza kupezeka kwake, njira yosavuta yopangira, mtengo wotsika, komanso kugwiritsa ntchito mosavuta. Amagwiritsidwa ntchito kwambiri m'magawo osiyanasiyana monga nyumba, misewu, milatho, tunnel, ndi uinjiniya wama hydraulic. Pamene kuchuluka kwa ntchito zauinjiniya zakula, zofunikila pakugwira ntchito kwa konkriti zawonjezekanso pang'onopang'ono. Chifukwa chake, zofooka za konkire yachikhalidwe, monga kusakwanira kwamphamvu kwamphamvu, kusagwira bwino kwa ming'alu, ndi kusakhazikika kwamphamvu, zawonekera. Chifukwa chake, kuwongolera magwiridwe antchito a konkriti nthawi zonse kwakhala imodzi mwamaupangiri ofunikira mu engineering ya Civil engineering.

Kuti konkriti igwire bwino ntchito, ulusi umawonjezedwa kuti uwongolere makina ake komanso kulimba kwake. Zitsanzo zikuphatikizapo Fiber yachitsulos (SF), ulusi wopangidwa (monga ulusi wa polypropylene), ulusi wa mchere (monga ulusi wa basalt - BF), ndi ulusi wa kaboni (CF). Njirayi yawonjezeranso ntchito ya konkire yapamwamba kwambiri (HPC) ndi konkriti yapamwamba kwambiri (UHPC).

Ulusi ukhoza, pamlingo wina, kusintha mawonekedwe a konkire. Komabe, mitundu yosiyanasiyana ya ulusi ndi zomwe zili mkati zimabweretsa kusintha kwakukulu pamakina a konkriti. Pakadali pano, kuchuluka kwa ulusi wa fiber, ubale wochulukira pakati pa magawo ofunikira ndi zida zamakina, ndi njira zoyambira za konkriti zolimbitsa ulusi zimafunikirabe kumveka bwino. Kafukufukuyu adafufuza za carbon fibers (CF), ulusi wa basalt (BF), ndi zitsulo zachitsulo (SF) monga maphunziro ofufuza, kukonzekera zitsanzo za konkire zomwe zimakhala ndi ulusi wosiyanasiyana. Ulusiwu udasankhidwa chifukwa cha zolembedwa bwino zomwe zimagwira ntchito mu konkriti komanso kugwiritsa ntchito kofala. Kupyolera mu kuyesa kosinthika kosinthika, zotsatira za mtundu wa fiber ndi zomwe zili pa mphamvu yopondereza, zotanuka modulus, ndi kulephera kwa konkire kunayesedwa mwadongosolo. Kuphatikiza chithunzi cha digito ndi kusanthula njira zowunikira ma electron microscopy (SEM), kusinthika kwa ming'alu ya konkire yolimbitsa ulusi panthawi yoyeserera kudawonedwa, zomwe zidapangitsa zotsatirazi:

1.Poyerekeza ndi konkire wamba (PC), kuphatikiza zitsulo zachitsulo (SF), mpweya wa carbon (CF), ndi ulusi wa basalt (BF) idakulitsa kwambiri makina a fiber-reinforced konkriti (FRC) ndikusinthira kulephera kwake. Ulusiwu udasintha kuphatikizika kwa konkire komanso mawonekedwe apachiyambi a pore. Pamene fiber ikuchulukirachulukira, njira yolephera idasintha kuchoka ku brittle kupita ku ductile. Kusintha kofunikira kunali 0.5% kwa konkire yachitsulo (SFC) ndi 1.0% ya konkire ya carbon fiber (CFC) ndi basalt fiber konkire (BFC). Kuti muwonjezere magwiridwe antchito amakina, ulusi wabwino kwambiri wazitsulo unali 2.0%, ulusi wa kaboni 1.0%, ndi ulusi wa basalt 0.5%.

2.Ngakhale kuti fiber ikhoza kupititsa patsogolo kugwirizanitsa ndi kunyamula mphamvu ya konkire, zowonjezereka kwambiri zingayambitse "machulukidwe" chodabwitsa, kuchititsa fiber "agglomeration." Izi zimasokoneza kwambiri mawonekedwe a konkriti, mphamvu zake, ndi mawonekedwe ake. Chitsulo CHIKWANGWANI konkire anapindula ntchito mulingo woyenera kwambiri CHIKWANGWANI voliyumu kagawo ka 2.0%, pamene mpweya CHIKWANGWANI konkire ndi basalt CHIKWANGWANI konkire anafika ntchito mulingo woyenera kwambiri pa 1.0% ndi 0.5%, motero. Kupitilira zomwe zili mulingo woyenera izi, magwiridwe antchito adatsika.

3.Kusanthula kwa Electron Microscopy (SEM) kunawonetsa kuti mgwirizano wapakati pakati pa ulusi ndi cementitious matrix zimakhudza kwambiri makina a macroscopic a konkire. Unyinji woyenerera wa ulusi umapanga mawonekedwe olimba amitundu itatu mkati mwa konkriti, kupititsa patsogolo kulumikizana kwa matrix ndi magwiridwe antchito onse. Komabe, kuchuluka kwa ulusi wochuluka kwambiri kumapangitsa kuti ulusiwo ugwirizane, kupangitsa madera ocheperako komanso kumachepetsa kachulukidwe ndi mphamvu ya konkriti. Kusintha kwa microstructure kunali kogwirizana kwambiri ndi kusinthika kwa macroscopic mechanical properties.

4.Kuwonjezera kwa ulusi kunasintha kwambiri kulephera kwa konkire. Poyerekeza ndi konkriti wamba, konkire yolimbitsa ulusi imawonetsa kukhulupirika pambuyo pa kulephera, yokhala ndi ming'alu yocheperako komanso yocheperako, komanso kulimba kokulirapo. Ulusi wachitsulo unali wothandiza kwambiri poletsa crack, kutsatiridwa ndi ulusi wa kaboni ndi ulusi wa basalt. "Kusokoneza" kwa ulusi kunathandiza kwambiri kupondereza kufalikira kwa ming'alu, pomwe "mawonekedwe ofooka" adasokoneza machitidwe amakina.