Hei momo rauemi pungarehu puia, he tino pai te metakaolin hei whakakapi mō te sima nā te mea he iti te whakamahinga pūngao me te iti o te parahanga taiao i te wā o te tukanga whakapūkara, me tōna kaha ki te whakapai ake i ētahi āhuatanga o te sima Portland, pērā i te kaha me te roa, ina hangaia hei sima whakaranu. I ngā tau tata nei, he maha ngā tohunga kua aro nui ki te ako i te mahi pungarehu puia o te kaolin. E whakamārama ana tēnei tuhinga i te pāmahana me te wā whakapūkara pai rawa atu o te kaolin, ngā āhuatanga e pā ana ki tana mahi, me ngā tikanga mō te kimi i ngā āhuatanga me te mahi a te kaolin. Kua whakaatuhia e ngā rangahau o mua ko te pāmahana me te wā whakapūkara pai rawa atu mō te kaolin ka pāngia e ngā āhuatanga pērā i te hanganga kohuke, te tioata, me te ihirangi kaolin, i roto i ēnei ko te tioata o te hanganga kaolin te mea nui rawa atu te pānga ki tana mahi i muri i te whakapūkara. I whakamahia te XRD, TG-DTA, IR me ētahi atu tikanga hei tātari i ngā āhuatanga o te konganuku mata. I whakatauhia te mahi a te kaolin mā roto i ngā tikanga pērā i te whakamātautau Frantini, te whakamātautau kawe hiko, me te taupū mahi kaha. Ko ngā tikanga tino tika ko te whakamātautau Frantini me te whakamātautau taupū mahi kaha.
Ko te Metakaolin (whakarāpopototanga ko MK) he silicate konumohe kore wai (Al2O3 • 2SiO2, AS2) i hangaia mā te whakamaroke i te kaolin (Al2O3 • 2SiO2 • 2 H2O, AS2H2) i te pāmahana tika (600-900 ℃). Kei roto te Kaolin i te hanganga silicate paparanga, ā, e honoa ana ngā paparanga e ngā hononga van der Waals, me ngā iona OH – e herea pūmau ana ki roto. Ina whakamahanatia te kaolin i te hau, ka pāngia e ētahi huringa hanganga. Ina whakamahanatia ki te 600 ℃, ka whakangaromia te hanganga paparanga o te kaolin nā te whakamaroke, ka hanga he wāhanga whakawhiti me te iti o te tioata – metakaolin.
Nā te āhua koretake o te whakaritenga ngota ngota o te metakaolin, he āhua pumau te pāmahana, ā, he āhuatanga sima tōna i raro i te whakaoho tika. He rauemi pungarehu puia horihori kaha rawa te metakaolin, ka taea te tauhohe ki te Ca (OH) 2 (CH) me te wai hei whakaputa hua whakamakuku rite ki te sima. Mā te whakamahi i tēnei āhuatanga, ina whakamahia hei ranunga mō te sima, ka taea te tauhohe ki te CH i hangaia i te wā o te tukanga whakamakuku sima, ka taea te whakapai ake i ētahi āhuatanga o te sima.
Ko te Metakaolin (MK) he hua i hangaia mā te whakamaroke i te kaolin i ngā pāmahana tiketike, ā, ka pā te pāmahana whakapūkara ki te mahi a te hua.
Ina piki te pāmahana ki runga ake i te 950 ℃, ka tīmata te hua ki te whakatio, ka huri hei mullite me te cristobalite,
Ka ngaro tōna kaha ki te whakamakuku.
Ko te kaolin kua whakapūkaratia he mea whakakī kore-waro e whakamahia whānuitia ana i roto i te umanga hanga rauemi polymer pēnei i te rapa, te kirihou, me ngā paninga. Ka taea e ia te whakaiti i te utu o ēnei hua, inā koa te whakapai ake i ngā āhuatanga ā-tinana me te matū o ngā rauemi.