Ukuqalisa
Izinto zokwenziwa ngosimende zibalulekile ekwakheni, zihlinzeka ngobuqotho obubalulekile bezakhiwo zezakhiwo, amabhuloho, kanye nengqalasizinda. Kodwa-ke, lezi zinto zokwenziwa zithambekele ekuqhekekeni kwezinkinga zokuqhekeka nokuqina ngenxa yezinto ezahlukahlukene zezemvelo nezemishini. Ukuhlanganiswa kwezithasiselo kuma-cementli axubile kuyicebo elicwaningwe kahle lokuthuthukisa izakhiwo zawo. I-Hydroxypropyll methylcellulose (HPMC) ivele njengesengezo esiphawuleka sokwenza ngcono ukusebenza kwezinto zokwenziwa kosimende.
Izindlela zokusebenza
I-HPMC iyi-polmer ether polymer eyaziwa ngokugcinwa kwayo kwamanzi, ukuthuthukiswa kwe-viscosity, kanye nezakhiwo ezakha amafilimu. Uma kungezwe ezintweni ezisetshenziselwa ukhula, i-HPMC ithonya inqubo ye-hydration, isakhiwo se-pore, kanye nokwakheka kwe-matrix ngezindlela eziningi:
Ukugcinwa kwamanzi nokulawulwa kwamanzi: I-HPMC ithuthukisa ukugcinwa kwamanzi ku-Cement Mix, okubaluleke kakhulu ukuthola i-hydration efanelekile yezinhlayiya zensimbi. I-hydration eyanele ibalulekile ekwakhekeni kwe-calcium buliate hydrate (Csh) gel, isisekelo esiyinhloko esinikeza usimende amandla awo. Ngokugcina amanzi, i-HPMC iqinisekisa ukuthi i-hydration iyaqhubeka isikhathi eside, okuholela ekuhlelweni okungathandeki nokuningi.
Ukuguqulwa kweVevisCosity: Ukungezelelwa kwe-HPMC kukhulisa ukubonakala kwesithasiselo sikasimende, okuthuthukisa ukusebenza nokuqina kokuhlanganiswa. Lokhu kuzuzisa ikakhulukazi ekunciphiseni ukwahlukaniswa nokopha, lapho amanzi nezinhlayiya ezinhle zihlukane nengxube eyinhloko. Ukuhlanganiswa okuzinzile kuqinisekisa ukusatshalaliswa okufanayo kwezinhlayiya zokwenza usimende, kufaka isandla kwinto enamandla futhi eqhekeke kakhulu yokuqhekeka.
Ukulungiswa kwefilimu nokuguqulwa kwesakhiwo se-Pore: I-HPMC yakha i-Flexible, Coabive Film phakathi kwe-matrix kasimende. Le filimu ingaguqa ama-microcracks futhi ithuthukise ukulahleka okuphelele kwezinto. Ngokwengeziwe, i-HPMC ithonya isakhiwo se-pore ngokunciphisa i-capillarity popolity kanye nokwehliswa kosayizi we-pore. Isakhiwo se-denser pore sinciphise ukuvumela, ngaleyo ndlela sithuthukise ukumelana nezici zezemvelo ezinjengemijikelezo ye-freeze-thaw, ukuhlasela kwamakhemikhali, kanye ne-carbonation.
Izinzuzo ze-HPMC ezintweni ezenzelwe amasimende
Ukufakwa kwe-HPMC ngezinto zokwenziwa ngokosiko kunikeza izinzuzo eziningana eziphawuleka, ngokuyinhloko zivukela ukuqina okuthuthukile kanye nokuphikiswa kokuqhekeka:
Ukuqina okukhulayo: amandla we-HPMC okugcina amanzi nokulawula i-hydration kuthinta ngokuqinile ukuqina kwesikhathi eside kwezinto zokwenza ukhula. Ngokuqinisekisa i-hydration ephelele kanye nokunciphisa i-pordy, izinto eziphathwa nge-HPMC zibonisa ukumelana okuthuthukile ezinqumweni ezahlukahlukene eziwohlokayo njengokuhlaselwa kwe-sulfate, i-alkali-silica reaction (asr), kanye ne-chloride ion penetation. Lokhu kuqina okunwebekayo kuhunyushwa ngempilo ende yenkonzo futhi kuncishiswe izindleko zokulungisa izakhiwo.
Ukumelana nokuqhekeka okuthuthukile: Ukuqhekeka ezintweni ezisetshenziswayo kasimende kungenziwa ngenxa ye-shrinkage yepulasitiki, ukomisa i-shrinkage, izingcindezi ezishisayo, nemithwalo yemishini. I-HPMC isiza ukunciphisa lezinkinga ngokugcinwa kwayo kwamanzi kanye nezakhiwo ezenziwe ngefilimu. Ngokugcina okuqukethwe umswakama okwanele ngesikhathi senqubo yokulapha, i-HPMC inciphisa ubungozi bokuqhekeka kwepulasitiki. Umthelela wayo ngosayizi we-pore kanye nokuthuthukisa i-matrix couctility kusho ukuthi lokho okuqukethwe kungasidonsa kangcono futhi kusabalalise izingcindezi, kunciphisa amathuba okusakazeka kokuqhekeka.
Ukusebenza okwenziwe ngcono kanye nezindawo zokusebenzisa: Ukuguqulwa kokubumbana kokuxubana yi-HPMC kusiza ukuphatha kangcono kanye nokusetshenziswa kwezinto zokwenziwa komoya. Lokhu kubaluleke kakhulu emisebenzini yokwakha lapho ukuthekelela kalula kanye nesivinini sohlelo lokusebenza kubalulekile. Amandla we-HPMC okuvimbela ukuhlukaniswa nokopha okuqinisekisa ukuthi ukuxuba kuhlala kuhlala kungaguquguquki futhi kugcwele, okubalulekile ekufezeni izinkinga ezisezingeni eliphakeme kanye nobuqotho bezinhlekelele.
Izicelo Ezisebenzayo
I-HPMC isetshenziswa emikhiqizweni ehlukahlukene esekwe kumasipala kanye nezinhlelo zokusebenza, ngamunye uzuza ezinhlakeni zakhe ezihlukile:
UDinga kanye nama-Plasters: ekwakhekeni kodaka nodaka, i-HPMC ithuthukisa umsebenzi, ukunamathela, kanye nokumelana nokuqhekeka. Lezi zakhiwo zibalulekile ekufezekiseni indawo ebushelelezi, ehlala isikhathi eside kuzo zombili izinhlelo zokusebenza zangaphakathi nezangaphandle.
Amakhompiyutha okuzimela: I-HPMC ithuthukisa izakhiwo zokugeleza kanye nokuqina kwamakhompiyutha okuzenzela, kuqinisekisa umfaniswano, indawo engenasisekelo. Lokhu kuzuzisa ikakhulukazi izinhlelo zokusebenza eziphansi lapho kutholakale khona izinga nokuqedwa okuqinile.
Ama-tile anamathela: I-HPMC ithuthukisa ukunamathela kanye nesikhathi esivulekile sokunamathela kwe-tile, okunikeza isikhathi esanele sokusebenza kanye nezindawo zokubopha eziqinile. Lokhu kuholela ekunciphiseni okuthuthukile kanye nokumelana nokuxineka kwe-Shear, okungadala amathayili ukuba aqhekeze noma akhishwe.
Izinto zokulungisa: Emalongeni kodaka kanye nama-grouts, i-hpmc inomthelela ekusebenzikeni okungcono futhi inciphise ukulungiswa, ukuqiniseka ukuthi ukulungiswa kuhlala isikhathi eside futhi kungaqhekeka. Lokhu kubalulekile ukuze ubuyisele ubuqotho bezakhiwo ezilimele.
Ukhonkolo we-shotrete nowafafazwe: I-HPMC ithuthukisa ukubumbana nokunamathela kwe-shotcrete, ukunciphisa ukuphindeka futhi kuqinisekiswe isibopho esiqinile nesixhasi se-substrate. Lokhu kubaluleke kakhulu ekwakheni komhubhe naphansi lapho ukuqina nokumelana nokuqhekeka kubalulekile.
Ukufakwa kwe-hydroxypropyllyllose (HPMC) ezintweni ezisetshenziswayo zikasimende kukhulisa kakhulu ukuqina kwazo nokumelana nokuqhekeka. Ngokwenza ngcono ukugcinwa kwamanzi, ukulungisa ukubonwa kwamanzi, nokwakha amafilimu aguqukayo ngaphakathi kwe-matrix kasimende, amakheli we-HPMC aphathelene nezinkinga ezibalulekile ezihlobene ne-hydration, epuration kanye nokusatshalaliswa kwengcindezi. Lokhu kuthuthuka kuholela ezintweni ezihlala isikhathi eside, ezingamelananga nokuqhekeka, futhi kulula ukuzisebenzisa, okuhunyushwa ngezinhlaka ezihlala njalo nasezethembeke kakhulu. Njengoba imboni yezokwakha iyaqhubeka nokufuna izindlela zokwenza ngcono ukusebenza nokuphila isikhathi eside kwezinto zokwenziwa kokonga, i-HPMC ibeka njengesengezo esibalulekile ngezinzuzo ezibanzi nezinhlelo zokusebenza.
Isikhathi sePosi: Feb-18-2025