Nā Pono Mechanical a me nā Mechanism Failure o ka Fiber-Reinforced Concrete: Ka Hoʻoikaika o ke ʻano Fiber a me ka ʻike.

ʻO ka paʻakai ka mea i hoʻohana nui ʻia Kūkulu mea waiwai. Hāʻawi ia i nā pōmaikaʻi he nui, me ka loaʻa ākea, ka hana maʻalahi, ke kumu kūʻai haʻahaʻa, a me ka maʻalahi o ka noi. Hoʻohana nui ʻia ia i nā kula like ʻole e like me nā hale, nā alanui, nā alahaka, nā tunnels, a me ka ʻenekinia hydraulic. I ka ulu ʻana o ka nui o nā papahana ʻenekinia, ua piʻi mālie nā koi i ka hana ʻana o ke kaʻa. No laila, ua ʻike ʻia nā hemahema o ke kaʻa kuʻuna, e like me ka lawa ʻole o ka ikaika tensile, ka pale ʻana i ka māwae, a me ka paʻa ʻole o ka leo. No laila, ʻo ka hoʻomaikaʻi ʻana i ka hana o ke kaʻa ka mea mau kekahi o nā kuhikuhi noiʻi koʻikoʻi i ka ʻenekinia kīwila.

No ka hoʻomaikaʻi ʻana i ka hana o ke kaʻa, hoʻohui pinepine ʻia nā fibers e hoʻomaikaʻi i kona ʻano mekini a me ka paʻakikī. Aia nā laʻana Kino kilas (SF), synthetic fibers (like polypropylene fibers), mineral fibers (e like me basalt fibers - BF), a me carbon fibers (CF). Ua hoʻoikaika hou kēia ala i ka hana o ke koʻo hana kiʻekiʻe (HPC) a me ka hana kiʻekiʻe kiʻekiʻe (UHPC).

Hiki i nā fiber ke hoʻomaikaʻi i nā ʻano mechanical o ke kaʻa. Eia nō naʻe, ʻo nā ʻano fiber like ʻole a me nā mea i ʻike ʻia e alakaʻi i nā ʻano like ʻole i ko lākou hopena i nā waiwai mechanical o ke kaʻa. I kēia manawa, ʻoi aku ka maikaʻi o ka maʻiʻo fiber, ka pilina nui ma waena o nā ʻāpana kūpono a me nā waiwai mechanical, a me nā ʻano kumu o ka fiber-reinforced concrete ke koi hou aku i ka wehewehe. Ua noiʻi kēia haʻawina i nā fiber carbon (CF), nā pulu basalt (BF), a me nā ʻili kila (SF) ma ke ʻano he noiʻi kumuhana, e hoʻomākaukau ana i nā ʻano kikoʻī me nā ʻano fiber like ʻole. Ua koho ʻia kēia mau fiber ma muli o kā lākou hoʻomaikaʻi ʻana i ka hana i kākau ʻia i loko o ka hoʻohana ʻana a me ka laha. Ma o nā hoʻokolohua hoʻololi i hoʻopaʻa ʻia, ua hoʻopaʻa ʻia nā hopena o ke ʻano fiber a me ka ʻike ma ka ikaika compressive, elastic modulus, a me ke ʻano hāʻule ʻole o ke kaʻa. ʻO ka hoʻohui ʻana i ke kiʻi kikohoʻe a me ka scanning electron microscopy (SEM), ʻike ʻia ke ʻano o ka hoʻomohala ʻana o ka ʻili i hoʻoikaika ʻia i ka fiber i ka wā o nā hoʻokolohua, e alakaʻi ana i kēia mau hopena:

1. Hoʻohālikelikeʻia me ka'āpana maʻamau (PC), ka hoʻokomoʻiaʻana o nā mea kila (SF), nā kalapona kalapona (CF), a nā pulu basalt (BF) i hoʻonui nui i nā waiwai mechanical o ka fiber-reinforced concrete (FRC) a hoʻololi i kona ʻano hana ʻole. Ua hoʻololi kēia mau fiber i ka paʻa o ke koneki a me nā hiʻohiʻona hoʻoemi pore mua. I ka hoʻonui ʻia ʻana o ka fiber, ua hoʻololi ke ʻano hāʻule mai ka brittle a ductile. ʻO ka helu hoʻololi koʻikoʻi he 0.5% no ke kila fiber concrete (SFC) a me 1.0% no nā ʻāpana kalapona ʻelua (CFC) a me ka basalt fiber concrete (BFC). No ka hoʻonui ʻana i ka hana mechanical, ʻo ka maʻiʻo maikaʻi loa no nā fibers kila he 2.0%, no nā fiber carbon 1.0%, a no nā fiber basalt 0.5%.

2.Although fiber maʻiʻo hiki ke hoʻomaikaʻi i ka compactness a me ka hali ana o ke kaʻa, excessively kiʻekiʻe maʻiʻo hiki ke alakai i ka "saturation" hanana, kumu fiber "agglomeration." Hoʻopilikia maikaʻi kēia i nā ʻano kino o ke koki, ikaika, a me nā ʻano deformation. Loaʻa i ka hana maikaʻi loa ma ka hapa nui o ka fiber o 2.0%, ʻoiai ʻo ka pulupulu kalapona a me ka basalt fiber i hōʻea i kā lākou hana maikaʻi loa ma 1.0% a me 0.5%, kēlā me kēia. Ma waho aʻe o kēia mau mea maikaʻi loa, ua hōʻole ka hana.

3. Hōʻike ka nānā ʻana i ka Electron Microscopy (SEM) i ka hoʻopaʻa ʻana o ka pilina ma waena o nā fibers a me ka matrix cementitious e hoʻoikaika nui i nā waiwai mechanical macroscopic o ke kaʻa. ʻO ka nui kūpono o nā fiber e hoʻokumu i kahi ʻano pūnaewele ʻekolu-dimensional i loko o ka pahu, e hoʻonui ai i ka pilina o ka matrix a me ka hana holoʻokoʻa. Eia naʻe, ke alakaʻi nei ka nui o ka fiber kiʻekiʻe i ka fiber agglomeration, ka hana ʻana i nā ʻāpana interfacial nāwaliwali a hōʻemi i ka paʻa a me ka ikaika o ke kaʻa. Ua kūlike nā loli i ka microstructure me ka hoʻomohala ʻana o nā waiwai mechanical macroscopic.

4. ʻO ka hoʻohui ʻana o nā fibers i hoʻololi nui i ke ʻano hana ʻole o ke kaʻa. I ka hoʻohālikelike ʻia me ka pāpaʻa paʻa, ua hōʻike ʻia ka ʻoi aku ka maikaʻi ma hope o ka hāʻule ʻana, me ka liʻiliʻi a me ka liʻiliʻi o nā māwae, a me ka ʻoi aku ka paʻakikī. ʻOi aku ka maikaʻi o nā pulu kila i ka pale ʻana i ka māwae, a ukali ʻia e nā fiber carbon a me nā fiber basalt. He koʻikoʻi ko ka "pilikia pili" o nā fibers i ke kāohi ʻana i ka hoʻolaha ʻana o ka māwae, aʻo ka "hopena interface nāwaliwali" he hopena maikaʻi ʻole i nā waiwai mechanical.