Ke kuleana o metakaolin i loko o ka sima

(1) ʻO ka hoʻomaikaʻi ʻana i ka ikaika o ka slurry sima a me ka mortar, ʻo ka ikaika kiʻekiʻe kekahi o nā hōʻailona o ka sima hana kiʻekiʻe. ʻO kekahi o nā kumu nui o ka hoʻohui ʻana i ka metakaolin, ʻo ia ka hoʻomaikaʻi ʻana i ka ikaika o ka mortar sima a me ka sima.

Ua hana ʻo Poon et al. (2001) i nā hoʻāʻo ikaika compressive ma nā slurries sima me ka lakio sima wai o 0.3, i hoʻomākaukau ʻia ma ke pani ʻana i ka sima Portland me 0-20% (hapa nui) kaolin a me ka pauka silica. Ua hōʻike nā hopena ua ʻoi aku ka ikaika compressive o nā slurries sima e loaʻa ana he 5% a 20% kaolin ma mua o ka sima kuhikuhi i nā makahiki āpau, me ka sima e loaʻa ana he 10% kaolin e hōʻike ana i ka piʻi ʻana o 20% i ka ikaika ma 28 a me 90 mau lā i hoʻohālikelike ʻia me ka sima kuhikuhi. Ua hōʻike pū ka sima e loaʻa ana he 5% a 10% pauka silica i ka piʻi ʻana o 20% i ka ikaika ma 28 a me 90 mau lā i hoʻohālikelike ʻia me ka sima kuhikuhi. ʻO kona ikaika ma 28d a me 90d ua like ia me ka sima kaolin, akā ʻoi aku ka haʻahaʻa o kona ikaika mua ma mua o ka sima benchmark. Hōʻike ka loiloi e pili ana paha kēia i ka hoʻopili nui ʻana o ka pauka silicon i hoʻohana ʻia a me ka lawa ʻole o ka hoʻopuehu ʻana i ka slurry sima.

(2) Ua aʻo ʻo Li Keliang et al. (2005) i nā hopena o ka mahana calcination, ka manawa calcination, a me ka nui o SiO2 a me A12O3 i loko o ke kaolin ma ka hana o metakaolin e hoʻomaikaʻi i ka ikaika o ka sima sima. Ua hoʻomākaukau ʻia nā polymers sima ikaika a me ka lepo me ka hoʻohana ʻana i ka metakaolin. Hōʻike nā hopena i ka wā he 15% ka nui o ke kaolin a he 0.4 ka lakio sima wai, ʻo ka ikaika compressive 28 lā he 71.9 MPa. Ke 10% ka nui o ke kaolin a he 0.375 ka lakio sima wai, ʻo ka ikaika compressive 28 lā he 73.9 MPa. Eia kekahi, i ka wā he 10% ka nui o ka metakaolin, hiki i kāna helu hana i 114, ʻo ia hoʻi he 11.8% kiʻekiʻe ma mua o ka nui like o ka pauka silicon. No laila, ua manaʻoʻiʻo ʻia hiki ke hoʻohana ʻia ka metakaolin e hoʻomākaukau i ka sima ikaika kiʻekiʻe.

Ua aʻo ʻo Qian Xiaoqian et al. (2001) i ka pilina axial tensile stress-strain o ka sima me ka nui o ka kaolin o 0, 0.5%, 10%, a me 15%. Ua ʻike lākou me ka hoʻonui ʻia ʻana o ka nui o ka kaolin, ua hoʻonui nui ʻia ke koʻikoʻi o ka ikaika tensile axial o ka sima, a ua noho mau ka modulus elastic tensile i loli ʻole. Eia naʻe, ua hoʻonui nui ʻia ka ikaika compressive o ka sima, a ua emi pū ka lakio ikaika compressive. Ke 15% ka nui o ka kaolin, ʻo ka ikaika tensile a me ka ikaika compressive o ka sima he 128% a me 184% o ka sima kuhikuhi.

Ua ʻike ʻo Cao Zhengliang et al. (2004) i kā lākou noiʻi ʻana i ka hopena hoʻoikaika o ka pauka ultrafine o metakaolin ma ka sima, ma lalo o ka wai like, ua hoʻonui ka mortar i loaʻa ka 10% metakaolin i kona ikaika compressive a me ka ikaika flexural ma 6% a 8% ma hope o 28 mau lā. ʻOi aku ka wikiwiki o ka hoʻomohala ʻana o ka ikaika mua o ka sima i hui pū ʻia me ka metakaolin ma mua o ka sima maʻamau. Ke hoʻohālikelike ʻia me ka sima benchmark, ʻo ka sima i loaʻa ka 15% metakaolin he 84% ka piʻi ʻana o ka ikaika compressive axial 3D a me 80% ka piʻi ʻana o ka ikaika compressive axial 28d, ʻoiai ʻo ka modulus elastic static he 9% ka piʻi ʻana o 3D a me 8% ka piʻi ʻana o 28d.

Ua aʻo ʻo Huang Zhan et al. (2008) i ka hopena o nā lakio hui like ʻole o ka metakaolin a me ka slag ma ka ikaika a me ke kūpaʻa o ka sima. Hōʻike nā hopena i ka hoʻohui ʻana o ka metakaolin i ka sima slag e hoʻomaikaʻi i ka ikaika a me ke kūpaʻa o ka sima. ʻO ka lakio kūpono o ka slag i ka sima ma kahi o 3:7, e hopena ana i ka ikaika sima kūpono. ʻOi aku ka ʻokoʻa o ke kua o ka sima hui ma mua o ka sima slag hoʻokahi, ma muli o ka hopena lehu pele o ka metakaolin. ʻOi aku ka kiʻekiʻe o kona ikaika tensile mahele ma mua o ka sima benchmark.

Ua hoʻohana ʻo Yang Fengling et al. (2011) i nā nui like o ka metakaolin, ka lehu lele, a me ka slag e pani i ka sima, a ua hoʻohui ʻokoʻa ʻia ka metakaolin me ka lehu lele a me ka slag e hoʻomākaukau i ka sima. Ua aʻo ʻia ka hana, ka ikaika compressive, a me ke kūpaʻa o ka sima. Ua hōʻike ʻia nā hopena i ka wā i hoʻohana ʻia ai ke kaolin e pani i ka 5% a i 25% o ka sima ma nā nui like, ua hoʻomaikaʻi ʻia ka ikaika compressive o ka sima i nā makahiki āpau; Ke hoʻohana ʻia ke kaolin ma nā nui like e pani i ka sima ma 20%, kūpono ka ikaika compressive i kēlā me kēia makahiki. ʻO ka ikaika ma 3d, 7d, a me 28d he 26.0%, 14.3%, a me 8.9% kiʻekiʻe ma mua o ka sima me ka ʻole o kaolin i hoʻohui ʻia. Hōʻike kēia no ka sima Portland Type II, hiki i ka hoʻohui ʻana o ka metakaolin ke hoʻomaikaʻi i ka ikaika o ka sima i hoʻomākaukau ʻia.

Ua hoʻohana ʻo Zhang Chengbo et al. (2012) i ka slag kila, metakaolin, a me nā mea ʻē aʻe ma ke ʻano he mau mea maka nui e hoʻomākaukau ai i ka sima geopolymer e pani i ka sima Portland kuʻuna, e hoʻokō ana i ka pahuhopu o ka mālama ʻana i ka ikehu, ka hoʻemi ʻana i ka hoʻohana ʻana, a me ka hoʻolilo ʻana i ka ʻōpala i waiwai. Ua hōʻike nā hopena i ka wā i 20% ka nui o ke kila a me ka nui o ka lehu lele, ua hiki ka ikaika o ka poloka hoʻāʻo ma 28 mau lā i kahi pae kiʻekiʻe loa (95.5MPa). I ka piʻi ʻana o ka nui o ka slag kila i hoʻohui ʻia, hiki iā ia ke pāʻani i kahi kuleana i ka hōʻemi ʻana i ka emi ʻana o ka sima geopolymer.

Ua lawe ʻo Chen Guocan (2010) i ke ala loea o "Portland cement + active mineral admixture + high-efficiency water reducing agent", ʻenehana sima wai magnetized a me ke kaʻina hana hoʻomākaukau maʻamau, a ua hana i nā hoʻokolohua hoʻomākaukau ma ka sima pōhaku ikaika ultra-kiʻekiʻe haʻahaʻa kalapona me ka hoʻohana ʻana i nā mea maka i loaʻa mai kahi kūloko e like me nā pōhaku a me ka slag. Hōʻike nā hopena he 10% ka nui kūpono o ka metakaolin. ʻO ka lakio nuipa i ka ikaika o ka hāʻawi ʻana o ka sima no kēlā me kēia anakahi nuipa o ka sima pōhaku ikaika ultra-kiʻekiʻe ma kahi o 4.17 mau manawa o ka sima maʻamau, 2.49 mau manawa o ka sima ikaika kiʻekiʻe (HSC), a me 2.02 mau manawa o ka sima pauka reactive (RPC). No laila, ʻo ka sima pōhaku ikaika ultra-kiʻekiʻe i hoʻomākaukau ʻia me ka sima haʻahaʻa haʻahaʻa ke kuhikuhi o ka hoʻomohala ʻana o ka sima i ka wā hoʻokele waiwai haʻahaʻa kalapona.

(3) Ma hope o ka hoʻohui ʻana i ke kaolin me ke kū'ē ʻana i ka hau i ka sima, ua hoʻemi nui ʻia ka nui o ka pore o ka sima, e hoʻomaikaʻi ana i ke kaʻapuni hau-hoʻoheheʻe o ka sima. Ua ʻike ʻo Feng Naiqian (2002) ma lalo o kekahi helu o nā kaʻapuni hau-hoʻoheheʻe, ʻoi aku ka kiʻekiʻe o ka modulus elastic o ka hāpana sima me ka ʻike kaolin 15% i 28 mau lā o ka makahiki ma mua o ka sima kuhikuhi i 28 mau lā o ka makahiki. ʻO ka hoʻopili hui ʻana o ka metakaolin a me nā pauka mineral ultrafine ʻē aʻe i loko o ka sima hiki ke hoʻomaikaʻi nui i ka hana paʻa o ka sima.