Udaka oluxutshwe ngamanzi luyi-samente, i-fine aggregate, i-addition, amanzi kanye nezingxenye ezahlukahlukene ezinqunywa ngokusebenza. Ngokwesilinganiso esithile, ngemva kokulinganiswa nokuhlanganiswa esiteshini sokuxuba, luthuthwa luye endaweni olusetshenziswa yiloli yokuxuba, bese lufakwa endaweni ekhethekile. Ingxube emanzi igcinwa esitsheni futhi isetshenziswe ngaphakathi kwesikhathi esibekiwe.
I-Hydroxypropyl methylcellulose isetshenziswa njenge-ejenti yokugcina amanzi kanye ne-retarder ye-cement mortar ukuze i-mortar ikwazi ukupompa. Isetshenziswa njenge-binder ku-plaster yokuplaster, ithuthukisa ukusabalala futhi yandise isikhathi sokusebenza. Ukusebenza kokugcinwa kwamanzi kwe-hydroxypropyl methylcellulose HPMC kuvimbela i-slurry ukuthi ingaqhekeki ngenxa yokoma ngokushesha kakhulu ngemva kokusetshenziswa, futhi kuthuthukisa amandla ngemva kokuqina. Ukugcinwa kwamanzi kuyindlela ebalulekile yokusebenza kwe-hydroxypropyl methylcellulose HPMC, futhi futhi kuyindlela abakhiqizi abaningi be-wet-mix mortar basekhaya abayinakayo. Izici ezithinta umphumela wokugcinwa kwamanzi we-wet-mix mortar zihlanganisa inani le-HPMC elingeziwe, i-viscosity ye-HPMC, ubuncane bezinhlayiya, kanye nokushisa kwendawo yokusetshenziswa.
Indima ebalulekile ye-hydroxypropyl methylcellulose HPMC ku-wet-mix mortar inezici ezintathu, enye ikhono elihle kakhulu lokugcina amanzi, enye ithonya ekuhambisaneni kanye ne-thixotropy yo-wet-mix mortar, kanti eyesithathu ukusebenzisana nesamente. Umphumela wokugcina amanzi we-cellulose ether uncike ekumuncweni kwamanzi kwesendlalelo esiyisisekelo, ukwakheka ko-mortar, ukujiya kongqimba lo-mortar, isidingo samanzi so-mortar, kanye nesikhathi sokusetha kwezinto zokusetha. Uma ukucaca kwe-hydroxypropyl methylcellulose kuphakeme, kulapho ukugcinwa kwamanzi kuba ngcono khona.
Izici ezithinta ukugcinwa kwamanzi kwe-wet-mix mortar zifaka phakathi i-cellulose ether viscosity, inani lokwengeza, ubuncane bezinhlayiya kanye nokushisa kokusetshenziswa. Uma i-cellulose ether i-viscosity inkulu, kulapho ukusebenza kokugcinwa kwamanzi kuba ngcono khona. I-Viscosity iyipharamitha ebalulekile yokusebenza kwe-HPMC. Kumkhiqizo ofanayo, imiphumela ye-viscosity elinganiswa ngezindlela ezahlukene ihlukile kakhulu, futhi eminye ize ibe nomehluko ophindwe kabili. Ngakho-ke, uma kuqhathaniswa i-viscosity, kumele kwenziwe phakathi kwezindlela zokuhlola ezifanayo, kufaka phakathi izinga lokushisa, i-rotor, njll.
Ngokuvamile, uma i-viscosity iphakeme, umphumela wokugcina amanzi uba ngcono. Kodwa-ke, uma i-viscosity iphakeme futhi isisindo sama-molecule se-HPMC siphakeme, ukwehla okuhambisanayo kokuncibilika kwayo kuzoba nomthelela omubi emandleni nasekusebenzeni kokwakhiwa kwe-mortar. Uma i-viscosity iphakeme, umphumela wokujiya ubonakala kakhulu ku-mortar, kodwa awulingani ngokuqondile. Uma i-viscosity iphakeme, kulapho i-mortar emanzi izoba yinkimbinkimbi khona, okungukuthi, ngesikhathi sokwakhiwa, ibonakala njengokunamathela ku-scraper kanye nokunamathela okuphezulu ku-substrate. Kodwa akusizi ukwandisa amandla esakhiwo se-mortar emanzi uqobo. Ngesikhathi sokwakhiwa, ukusebenza okulwa nokuwa akubonakali. Ngokuphambene nalokho, i-hydroxypropyl methylcellulose ethile eguquliwe ene-viscosity ephakathi nephansi inokusebenza okuhle kakhulu ekuthuthukiseni amandla esakhiwo se-mortar emanzi.
Uma inani elikhulu le-cellulose ether HPMC lingeziwe ku-mortar exutshwe ngamanzi, ukusebenza kokugcinwa kwamanzi kuba ngcono, futhi uma i-viscosity iphakeme, ukusebenza kokugcinwa kwamanzi kuba ngcono. Ubunono futhi buyinkomba yokusebenza ebalulekile ye-hydroxypropyl methylcellulose.
Ubuncane be-hydroxypropyl methylcellulose bunomthelela othile ekugcinweni kwamanzi kwayo. Ngokuvamile, nge-hydroxypropyl methylcellulose ene-viscosity efanayo kodwa ubuncane obuhlukile, uma incane kakhulu, iba ncane kakhulu. Umphumela wokugcina amanzi ungcono.
Ku-mortar exutshwe ngamanzi, inani lokwengeza le-cellulose ether HPMC liphansi kakhulu, kodwa lingathuthukisa kakhulu ukusebenza kokwakhiwa kwe-mortar exutshwe ngamanzi, futhi liyisithasiselo esiyinhloko esithinta ukusebenza kokwakhiwa kwe-mortar. Ukukhetha okunengqondo kwe-hydroxypropyl methylcellulose efanele kunethonya elikhulu ekuthuthukisweni kokusebenza kwe-mortar exutshwe ngamanzi.
Isikhathi sokuthunyelwe: Mashi-31-2023