Te tūranga o te metakaolin i roto i te raima

(1) Te whakapai ake i te kaha o te paru sima me te moata, ko te kaha teitei tētahi o ngā tohu o te raima mahi teitei. Ko tētahi o ngā kaupapa matua o te tāpiri i te metakaolin ko te whakapai ake i te kaha o te moata sima me te raima.

I whakahaerehia e Poon et al. (2001) ngā whakamātautau kaha pēhi i runga i ngā paru sima me te ōwehenga sima wai o te 0.3, i whakaritea mā te whakakapi i te sima Portland ki te 0-20% (wāhanga papatipu) kaolin me te paura silica. I whakaatuhia e ngā hua he teitei ake te kaha pēhi o ngā paru sima kei roto te 5% ki te 20% kaolin i tērā o te sima tohutoro i ngā reanga katoa, me te sima kei roto te 10% kaolin e whakaatu ana i te pikinga 20% o te kaha i te 28 me te 90 rā ki te whakarite ki te sima tohutoro. Ko te sima kei roto te 5% ki te 10% paura silica i whakaatu hoki i te pikinga 20% o te kaha i te 28 me te 90 rā ki te whakarite ki te sima tohutoro. Ko tōna kaha i te 28d me te 90d he rite ki te sima kaolin, engari he iti iho tōna kaha tōmua i te sima paerewa. E kī ana ngā tātaritanga he hononga pea tēnei ki te nui o te kohikohinga o te paura silicon i whakamahia me te koretake o te mararatanga i roto i te paru sima.

(2) I rangahau a Li Keliang et al. (2005) i ngā pānga o te pāmahana whakapūkara, te wā whakapūkara, me te ihirangi SiO2 me te A12O3 i roto i te kaolin ki te mahi a te metakaolin hei whakapai ake i te kaha o te raima sima. I whakaritea ngā poraka raima me te oneone kaha teitei mā te whakamahi i te metakaolin. E whakaatu ana ngā hua ina 15% te ihirangi o te kaolin, ā, ko te ōwehenga sima wai he 0.4, ko te kaha pēhi mō ngā rā 28 he 71.9 MPa. Ina 10% te ihirangi o te kaolin, ā, ko te ōwehenga sima wai he 0.375, ko te kaha pēhi mō ngā rā 28 he 73.9 MPa. Heoi anō, ina 10% te ihirangi o te metakaolin, ka eke tōna taupū mahi ki te 114, arā, he 11.8% teitei ake i te nui o te paura silicon. Nō reira, e whakaponohia ana ka taea te whakamahi i te metakaolin hei whakarite i te raima kaha teitei.

I rangahau a Qian Xiaoqian me ētahi atu (2001) i te whanaungatanga o te ahotea kume-taumahatanga tuaka o te raima me te nui o te kaolin o te 0, 0.5%, 10%, me te 15%. I kitea e rātou, i te pikinga ake o te nui o te kaolin, ka tino piki ake te taumahatanga tihi o te kaha kume tuaka o te raima, ā, kāore i rerekē te modulus tensile elastic. Heoi, ka tino piki ake te kaha pēhi o te raima, ā, ka heke te ōwehenga kaha pēhi. Ina 15% te nui o te kaolin, ko te kaha kume me te kaha pēhi o te raima he 128% me te 184% o te raima tohutoro.

I kitea e Cao Zhengliang et al. (2004) i roto i tā rātou rangahau mō te pānga whakapakari o te paura tino pai o te metakaolin ki te raima, i raro i te rere kotahi, ka piki ake te kaha pēhi me te kaha piko o te moata kei roto te 10% metakaolin mā te 6% ki te 8% i muri i ngā rā 28. Ko te whanaketanga kaha tōmua o te raima i konatunatua ki te metakaolin he tere ake i te raima paerewa. Ki te whakatauritea ki te raima paerewa, ko te raima kei roto te 15% metakaolin he pikinga 84% i roto i te kaha pēhi tuaka 3D me te pikinga 80% i roto i te kaha pēhi tuaka 28d, ko te modulus elastic e pikinga 9% i roto i te 3D me te pikinga 8% i roto i te 28d.

I rangahau a Huang Zhan me ētahi atu (2008) i te pānga o ngā ōwehenga whakaranu rerekē o te metakaolin me te para ki te kaha me te roa o te raima. E whakaatu ana ngā hua ko te tāpiri o te metakaolin ki te para raima ka whakapai ake i te kaha me te roa o te raima. Ko te ōwehenga tino pai o te para ki te sima he tata ki te 3:7, ka hua ake he kaha raima tino pai. He paku teitei ake te rerekētanga o te āwhata o te raima hiato i te raima para kotahi, nā te pānga pungarehu puia o te metakaolin. He teitei ake tōna kaha kume wehewehe i te raima paerewa.

I whakamahia e Yang Fengling et al. (2011) ngā rahinga ōrite o te metakaolin, te pungarehu rere, me te para hei whakakapi i te sima, ā, i whakaranua motuhaketia te metakaolin ki te pungarehu rere me te para hei whakarite i te raima. I rangahauhia te kaha mahi, te kaha pēhi, me te roa o te raima. I whakaatuhia e ngā hua i te whakamahinga o te kaolin hei whakakapi i te 5% ki te 25% o te sima i ngā rahinga ōrite, i pai ake te kaha pēhi o te raima i ngā reanga katoa; Ina whakamahia te kaolin i ngā rahinga ōrite hei whakakapi i te sima mā te 20%, ko te kaha pēhi i ia reanga te mea tino pai. Ko te kaha i te 3d, 7d, me te 28d he 26.0%, 14.3%, me te 8.9% teitei ake i te raima kāore he kaolin i tāpirihia. E tohu ana tēnei mō te sima Portland Momo II, ka taea e te tāpiri o te metakaolin te whakapai ake i te kaha o te raima kua whakaritea.

I whakamahia e Zhang Chengbo me ētahi atu (2012) te para maitai, te metakaolin, me ētahi atu rauemi hei rauemi mata matua hei whakarite i te sima geopolymer hei whakakapi i te sima Portland tuku iho, kia tutuki ai te whāinga o te tiaki pūngao, te whakaiti i te kai, me te huri i te para hei taonga. I whakaatuhia e ngā hua i te wā i eke ai te ihirangi maitai me te ihirangi pungarehu rere ki te 20%, ka eke te kaha o te poraka whakamātautau i te 28 rā ki te taumata tino teitei (95.5MPa). I te pikinga ake o te nui o te para maitai i tāpirihia, ka taea hoki e ia te whai wāhi ki te whakaiti i te whakahekenga o te sima geopolymer.

I tangohia e Chen Guocan (2010) te ara hangarau o te "sima Portland+ranunga kohuke hohe+kaihoko whakaiti wai tino whai hua", te hangarau raima wai aukume me te tukanga whakarite tikanga, ā, i whakahaerehia ngā whakamātautau whakarite i runga i te raima para kohatu tino kaha-teitei waro-iti mā te whakamahi i ngā rauemi mata o te rohe pēnei i ngā kohatu me te para. E whakaatu ana ngā hua ko te horopeta tika o te metakaolin he 10%. Ko te ōwehenga papatipu ki te kaha o te takoha sima mō ia wae taumaha o te raima para kohatu tino kaha-teitei he tata ki te 4.17 ngā wā o te raima noa, 2.49 ngā wā o te raima kaha-teitei (HSC), me te 2.02 ngā wā o te raima paura tauhohe (RPC). Nō reira, ko te raima para kohatu tino kaha-teitei i whakaritea ki te sima iti te horopeta te huarahi whanaketanga raima i roto i te wā ōhanga iti-waro.

(3) Whai muri i te tāpiri i te kaolin me te ātete huka ki te raima, ka tino whakaitihia te rahi o ngā pūwero o te raima, ka pai ake te huringa tio-rewa o te raima. I kitea e Feng Naiqian (2002) i raro i tētahi maha o ngā huringa tio-rewa, ko te modulus elastic o te tauira raima me te ihirangi kaolin 15% i te 28 rā te pakeke he nui ake i te raima tohutoro i te 28 rā te pakeke. Mā te whakamahinga whakakotahi o te metakaolin me ētahi atu paura tino pai o te kohuke ki te raima ka tino whakapai ake i te mahi pakari o te raima.