1) Ukuthuthukisa amandla esimende kanye nodaka kungenye yezimpawu zokusebenza kahle kwekhonkrithi. Enye yezinhloso eziyinhloko zokwengeza i-metakaolin ukuthuthukisa amandla esimende kanye nodaka lwekhonkrithi.

UPoon nabanye, Amandla ayo ku-28d kanye no-90d alingana nalawo esimende se-metakaolin, kodwa amandla ayo okuqala aphansi kunesimende esilinganiselwe. Ukuhlaziywa kusikisela ukuthi lokhu kungase kuhlobane nokuhlanganiswa okukhulu kwempuphu ye-silicon esetshenzisiwe kanye nokuhlakazeka okunganele ku-slurry yesimende.

(2) ULi Keliang nabanye (2005) bafunde imiphumela yokushisa kwe-calcination, isikhathi se-calcination, kanye nokuqukethwe kwe-SiO2 kanye ne-A12O3 ku-kaolin emsebenzini we-metakaolin ukuthuthukisa amandla ekhonkrithi yesamente. Ama-polymer ekhonkrithi anamandla aphezulu kanye nenhlabathi alungiselelwe kusetshenziswa i-metakaolin. Imiphumela ikhombisa ukuthi lapho okuqukethwe kwe-metakaolin kungu-15% kanye nesilinganiso sekhonkrithi yamanzi kungu-0.4, amandla okucindezela ezinsukwini ezingu-28 angu-71.9 MPa. Uma okuqukethwe kwe-metakaolin kungu-10% kanye nesilinganiso sekhonkrithi yamanzi kungu-0.375, amandla okucindezela ezinsukwini ezingu-28 angu-73.9 MPa. Ngaphezu kwalokho, uma okuqukethwe kwe-metakaolin kungu-10%, inkomba yomsebenzi wayo ifinyelela ku-114, okuphakeme ngo-11.8% kunenani elifanayo lempuphu ye-silicon. Ngakho-ke, kukholelwa ukuthi i-metakaolin ingasetshenziswa ukulungiselela ikhonkrithi enamandla aphezulu.

Kufundwe ubudlelwano bokucindezeleka kokudonsa kwe-axial kokhonkolo nokuqukethwe kwe-metakaolin okungu-0, 0.5%, 10%, kanye no-15%. Kutholakale ukuthi ngokwanda kokuqukethwe kwe-metakaolin, ukucindezeleka okuphezulu kwamandla okudonsa kwe-axial kokhonkolo kwanda kakhulu, kanti i-modulus ye-tensile elastic yahlala ingashintshile. Kodwa-ke, amandla okucindezela ekhonkolo anda kakhulu, kuyilapho isilinganiso samandla okucindezela sehla ngokufanayo. Amandla okudonsa kanye namandla okucindezela ekhonkolo anokuqukethwe kwe-kaolin okungu-15% kungama-128% kanye no-184% wekhonkolo ebhekiselayo, ngokulandelana.
Lapho kufundwa umphumela wokuqinisa wempuphu ye-ultrafine ye-metakaolin kukhonkrithi, kwatholakala ukuthi ngaphansi kokuguquguquka okufanayo, amandla okucindezela kanye namandla okuguquguquka kokhonkolo oqukethe i-10% ye-metakaolin kwanda ngo-6% kuya ku-8% ngemva kwezinsuku ezingu-28. Ukuthuthukiswa kwamandla okuqala kukhonkrithi exutshwe ne-metakaolin kwakushesha kakhulu kunokhonkolo ojwayelekile. Uma kuqhathaniswa nekhonkrithi esezingeni elifanele, ikhonkrithi equkethe i-15% ye-metakaolin inokwenyuka okungu-84% kwamandla okucindezela kwe-3D axial kanye nokwenyuka okungu-80% kwamandla okucindezela kwe-28d axial, kuyilapho i-static elastic modulus inokwenyuka okungu-9% ku-3D kanye nokwenyuka okungu-8% ku-28d.

Kufundwe ithonya lesilinganiso esixubile senhlabathi ye-metakaolin kanye ne-slag emandleni nasekuqineni kwekhonkrithi. Imiphumela ikhombisa ukuthi ukufaka i-metakaolin kukhonkrithi ye-slag kuthuthukisa amandla nokuqina kwekhonkrithi, kanti isilinganiso esifanele se-slag nekhonkrithi singu-3:7, okuholela emandleni ekhonkrithi afanele. Umehluko we-arch wekhonkrithi ehlanganisiwe uphakeme kancane kunowekhonkrithi ye-slag eyodwa ngenxa yomphumela womlotha wentaba-mlilo we-metakaolin. Amandla ayo okuqhekeka aphakeme kunowekhonkrithi esezingeni elifanele.

Ukusebenza kahle, amandla okucindezela, kanye nokuqina kwekhonkrithi kwafundwa ngokusebenzisa i-metakaolin, umlotha ophumayo, kanye ne-slag njengezinto ezithatha indawo yesimende, kanye nokuxuba i-metakaolin nomlotha ophumayo kanye ne-slag ngokwehlukana ukuze kulungiswe ikhonkrithi. Imiphumela ikhombisa ukuthi uma i-metakaolin ithatha indawo yesimende esingu-5% kuya ku-25% ngamanani alinganayo, amandla okucindezela ekhonkrithi kubo bonke ubudala ayathuthuka; Uma i-metakaolin isetshenziswa ukufaka esikhundleni sekhonkrithi ngama-20% ngamanani alinganayo, amandla okucindezela kuyo yonke iminyaka afaneleka, futhi amandla ayo ku-3d, 7d, kanye no-28d angama-26.0%, 14.3%, kanye no-8.9% aphezulu kunalawo ekhonkrithi ngaphandle kokufakwa kwe-metakaolin, ngokulandelana. Lokhu kubonisa ukuthi ngekhonkrithi yohlobo lwesibili lwasePortland, ukufaka i-metakaolin kungathuthukisa amandla ekhonkrithi elungisiwe.

Ukusebenzisa i-slag yensimbi, i-metakaolin, nezinye izinto njengezinto zokusetshenziswa eziyinhloko ukulungiselela usimende we-geopolymer esikhundleni sikasimende wendabuko wasePortland, ukuze kufezwe umgomo wokonga amandla, ukunciphisa ukusetshenziswa, nokuguqula imfucuza ibe yingcebo. Imiphumela ikhombisa ukuthi lapho okuqukethwe yinsimbi nomlotha wempukane kungu-20%, amandla ebhulokhi yokuhlola ezinsukwini ezingama-28 afinyelela phezulu kakhulu (95.5MPa). Njengoba inani le-slag yensimbi engeziwe landa, lingadlala indima ethile ekunciphiseni ukuncishiswa kwesimende se-geopolymer.

Kusetshenziswa indlela yobuchwepheshe ethi “i-Portland cement+active mineral admixture+high-efficiency water reducing agent”, ubuchwepheshe bekhonkrithi yamanzi enemagnethi, kanye nezinqubo zokulungiselela ezivamile, kwenziwa izivivinyo ekulungiseleleni ikhonkrithi ye-slag yamatshe enekhabhoni ephansi kanye ne-ultra-high kusetshenziswa izinto zokusetshenziswa ezifana namatshe kanye ne-slag ezivela emithonjeni eminingi yendawo. Imiphumela ikhombisa ukuthi isilinganiso esifanele se-metakaolin siyi-10%. Isilinganiso sesisindo namandla somnikelo wekhonkrithi ngeyunithi ngayinye yekhonkrithi ye-slag yamatshe enekhabhoni eqine kakhulu cishe siphindwe izikhathi ezingu-4.17 kunekhonkrithi evamile, izikhathi ezingu-2.49 kunekhonkrithi enamandla aphezulu (HSC), kanye nezikhathi ezingu-2.02 kunekhonkrithi ye-reactive powder (RPC). Ngakho-ke, ikhonkrithi ye-slag yamatshe enekhabhoni ephansi elungiselelwe nge-low dosage cement iyisiqondiso sentuthuko yekhonkrithi esikhathini somnotho we-low-carbon.

(3) Ngemva kokufaka i-kaolin enokumelana neqhwa kukhonkolo, usayizi wembobo yekhonkolo uyancipha kakhulu, okuthuthukisa umjikelezo wokuqandisa kwekhonkolo. Ngaphansi kwenani elithile lemijikelezo yokuqandisa, i-modulus enwebekayo yesampula yekhonkolo enokuqukethwe okungu-15% kwe-kaolin ezinsukwini ezingu-28 ubudala iphakeme kakhulu kunekhonkolo ebhekisele kuyo ezinsukwini ezingu-28 ubudala. Ukusetshenziswa okuhlanganisiwe kwe-metakaolin kanye nezinye izimpushana ze-mineral ultrafine kukhonkolo nakho kungathuthukisa kakhulu ukuqina kwekhonkolo.