Mhando dzakasiyana dzeFiber Reinforced Concrete

1. Steel Fiber Yakasimbiswa Concrete

A no yesimbi fiber marudzi anowanikwa sekusimbisa.Round steel fiber rudzi runowanzo shandiswa runogadzirwa nekucheka waya yeround kusvika kuhurefu hupfupi.Iyo yakajairika dhayamita iri muhuwandu hwe0.25 kusvika 0.75mm.Mafiibha esimbi ane rectangular c/s anogadzirwa nekunyungudutsa mapepa anenge 0.25mm gobvu.

Fiber yakagadzirwa nesimbi yakapfava yakadhonzwa waya.Kuenderana neIS:280-1976 nedhayamita yewaya inosiyana kubva pa0.3 kusvika 0.5mm yakashandiswa muIndia.

Round simbi fibers inogadzirwa nekucheka kana kucheka waya, flat sheet fibers ine yakajairwa c / s kubva 0.15 kusvika 0.41mm muhukobvu uye 0.25 kusvika 0.90mm muhupamhi inogadzirwa nekuisa silting flat sheets.

Yakaremara fiber, iyo yakasununguka yakasungwa nemvura-inonyunguduka glue nenzira yebundle inowanikwawo.Sezvo mafiibhi ega ega anowanzo kuungana pamwechete, kugovera kwavo kwakafanana mumatrix kunowanzo kunetsa.Izvi zvinogona kudzivirirwa nekuwedzera fibers bundles, iyo inoparadzanisa panguva yekusanganiswa.

2. Polypropylene Fiber Reinforced (PFR) sement mortar uye kongiri

Polypropylene ndeimwe yeakachipa & anowanikwa akawanda mapolymers polypropylene fibers anoshingirira kumakemikari mazhinji & ingave simende matrix iyo yaizotanga kushata nekurwiswa kwemakemikari ane hukasha.Kunyungudika kwayo kwakakwira (inenge 165 degrees centigrade).Saka kuti kushanda temp.Sezvo (100 degree centigrade) inogona kuchengetedzwa kwenguva pfupi pasina kukanganisa kune fiber zvinhu.

Polypropylene fibers iri hydrophobic inogona kusanganiswa nyore nyore sezvo isingade kubata kwenguva refu panguva yekusanganiswa uye inongoda kushushikana zvakaenzana mumusanganiswa.

Polypropylene mapfupi faibha mudiki vhoriyamu zvikamu pakati pe 0.5 kusvika 15 zvekutengesa zvinoshandiswa mukongiri.

Fig.1: Polypropylene fiber yakasimbisa simenti-dhaka uye kongiri

3. GFRC - Glass Fiber Reinforced Concrete

Girazi faibha inogadzirwa kubva pa200-400 yega mafilaments ayo akasungirirwa zvishoma kuita chigadziko.Izvi zvinomira zvinogona kuchekwa kuita hurefu hwakasiyana-siyana, kana kusanganiswa kugadzira machira emucheka kana tepi.Uchishandisa nzira dzakajairwa dzekusanganisa kongiri yakajairika hazvibviri kusanganisa zvinopfuura 2% (nehuwandu) hwefiber dzehurefu hwe25mm.

Chishandiso chikuru chegirazi fiber chave mukusimbisa simende kana dhaka matrices anoshandiswa mukugadzira zvigadzirwa zvitete-pepa.Iwo anowanzo shandiswa verities egirazi fibers e-girazi rinoshandiswa.Mukusimbiswa kwemapurasitiki & AR girazi E-girazi ine kusakwana kupikisa alkalis aripo muPortland simende uko AR-girazi yakavandudza alkali inodzivirira maitiro.Dzimwe nguva mapolymer anowedzerwawo mumasanganiswa kuti avandudze zvimwe zvinhu zvemuviri zvakaita sekufamba kwemwando.

Fig.2: Girazi-fiber yakasimbiswa kongiri

4. Asbestos Fibers

Iyo inongowanikwa isingadhure mineral fiber, asbestos, yakasanganiswa zvakabudirira nePortland simende paste kugadzira chigadzirwa chinoshandiswa zvakanyanya chinonzi asbestos simende.Asbestos fibers pano thermal mechanical & chemical resistance ichiita kuti ive yakakodzera kune mapepa echigadzirwa pombi, mataira uye denga remba zvinhu.Asbestos simende board inosvika kaviri kana kana iyo yeasina kusimbiswa matrix.Nekudaro, nekuda kwehurefu hupfupi (10mm) iyo fiber ine yakaderera simba simba.

Fig.3: Asbestos fiber

5. Carbon Fibers

Carbon fibers kubva kune ichangoburwa & mukana inoshamisa yekuwedzera kune huwandu hwefiber inowanikwa kushandiswa kwekutengesa.Carbon fiber inouya pasi peiyo yakanyanya kukwira modulus yekunyungudika uye kuchinjika simba.Izvi zvinowedzera.Simba ravo & kuomarara maitiro akawanikwa ari epamusoro kunyangwe kune ayo esimbi.Asi ivo vari panjodzi yekukuvadzwa kupfuura kunyange girazi fiber, uye nekudaro vanowanzobatwa neresign coating.

Fig.4: Carbon fibers

6. Organic Fibers

Organic fiber yakadai sepolypropylene kana faibha yechisikigo inogona kunge iine makemikari inert kupfuura simbi kana girazi fibers.Izvo zvakare zvakachipa, kunyanya kana zvakasikwa.Huwandu hukuru hwefiber yemiriwo inogona kushandiswa kuwana yakawanda yekutsemuka inoumbwa.Dambudziko rekusanganisa uye kupararira kweyunifomu rinogona kugadziriswa nekuwedzera superplasticizer.

Fig.5: Organic fiber