I-samente yenye yezona zinto zisetyenziswa ngokuqhelekileyo kwintsimi yokwakha, kwaye ukusebenza kwe-samente yinto ebalulekileyo echaphazela umphumo wokwakha, inkqubo kunye nokusebenza kokugqibela kwesakhiwo. Ukuze kuphuculwe ukusebenza kakuhle kwesamente, imixube eyahlukeneyo idla ngokudityaniswa kwisamente. Phakathi kwabo,ihydroxypropyl methylcellulose (HPMC), njengomxube wesamente osetyenziswa ngokuqhelekileyo, udlala indima ebalulekileyo.
(1) Iipropati ezisisiseko ze-HPMC
I-HPMC (Hydroxypropyl Methylcellulose)yikhompawundi yepolymer enyibilikayo emanzini esetyenziswa kakhulu kulwakhiwo, iingubo, amayeza, ukutya kunye namanye amashishini. Kwisamente, i-HPMC idla ngokusetyenziswa njenge-thickener, i-agent egcina amanzi kunye ne-rheology modifier ukuze kuphuculwe i-fluidity ye-sement slurry, ukulibazisa ukusetwa kokuqala kwesamente kunye nokuphucula ukusebenza kwesamente. Ngesakhiwo sayo esiyingqayizivele se-molecular, i-HPMC inokusebenzisana nama-molecule amanzi kunye neengqungquthela eziqinileyo kwi-sement slurry, ngaloo ndlela iphucula ukusebenza kwe-samente.
(2) Impembelelo ye-HPMC ekusebenzeni kwesamente
Ukusebenza kwesamente kubandakanya iinkalo ezininzi, eyona nto ibaluleke kakhulu kukumanzi, ukuxhamla kunye nokusebenza kwe-samente slurry ngexesha lokwakha. I-HPMC inokuphucula kakhulu ukusebenza kwesamente kwiinkalo ezininzi.
1. Ukuphucula ubumanzi bodaka lwesamente
Ubumanzi besamente bubhekiselele ekukwazini kwentlama yesamente ukuhamba ngokukhululekileyo ngexesha lolwakhiwo. I-Cement slurry ene-fluidity embi iya kubangela iingxaki ezinjengobunzima bokuxuba kunye nesicelo esingalinganiyo ngexesha lokwakha, okuya kuchaphazela ukusebenza kakuhle kunye nesiphumo. I-HPMC ineempawu ezigqwesileyo zokujiya kwaye inokunyusa ngokufanelekileyo i-viscosity yodaka lwesamente. Isakhiwo sayo se-molecular chain chain sisebenzisana nama-molecule amanzi kunye neengqungquthela ze-samente ukuze zenze i-viscous network structure, ngaloo ndlela iphucula i-fluidity ye-slurry.
Ngokulungelelanisa inani le-HPMC eyongeziweyo, i-fluidity ye-sement slurry inokulawulwa ngokuguquguqukayo, engakwazi nje ukuphucula i-fluidity, kodwa iphinde igweme ukuhlukana kwe-slurry kunye nokuhlaliswa okubangelwa ukuhamba ngokugqithiseleyo. Ngoko ke, ukusetyenziswa kwe-HPMC kunokunceda ukufumana i-slurry ezinzileyo kunye nefanayo ngexesha lokwakhiwa kwesamente, ngaloo ndlela iqinisekisa umgangatho wokwakha.
2. Libazise ixesha lokuqala lokumisela isamente
Ixesha lokuqala lokumisela isamente libhekisela kwixesha apho isamente iqala ukuqina. Ukuba ixesha lokuqala lokumisela lifutshane kakhulu, liya kwenza ukuba i-samente ibe nzima ukusebenza ngexesha lenkqubo yokwakha kwaye ichaphazele umgangatho wokwakha; ukuba ixesha lokuqala lokumisela lide kakhulu, linokubangela ukulahleka kwamanzi kunye nokunciphisa amandla odaka lwesamente. Njenge-ejenti ejiyileyo kunye nokugcina amanzi, i-HPMC inokulibazisa inkqubo ye-hydration yesamente ngokudibanisa nokufuma kwi-slurry ye-samente, ngaloo ndlela yandisa ngokufanelekileyo ixesha lokuqala lokumisela. Ngokulawula inani le-HPMC elongeziweyo, ixesha lokuqala lokumisela i-sement slurry lingalungiswa ngokuchanekileyo ukuze kuqinisekiswe ukusebenza okwaneleyo kwesamente ngexesha lenkqubo yokwakha.
3. Ukuphucula ukugcinwa kwamanzi kwisamente
I-samente kufuneka igcine iqondo elithile lokufuma ngexesha lenkqubo yokwakha ukuqinisekisa inkqubela egudileyo yokusabela kwayo kwi-hydration. Xa ukugcinwa kwamanzi kwi-samente kubi, amanzi aya kuphuma ngumphunga ngokukhawuleza, okukhokelela kwiingxaki ezifana nokuqhekeka kunye nokunciphisa amandla e-cement paste. Njenge-polymer compound, i-HPMC inokwenza i-"hydrogel"-efana nesakhiwo sothungelwano kwi-sement slurry ukulungisa ngokuqinileyo amanzi kwi-slurry, ngaloo ndlela iphucula ngokufanelekileyo ukugcinwa kwamanzi kwi-samente. Ngelixa ukugcinwa kwamanzi kuphuculwe, i-sement slurry izinzile ngakumbi ngexesha lokwakha, ukunciphisa ukwenzeka kwe-sement shrinkage, ii-cracks kunye nezinye iingxaki.
4. Ukuphucula i-rheology ye-cement paste
I-Rheology ibhekisela kwiimpawu zezinto eziphazamisayo phantsi koxinzelelo, ngokuqhelekileyo zibandakanya i-viscosity, i-fluidity, njl. Kwi-samente slurries, iimpawu ezintle ze-rheological zinceda ukuphucula ukusebenza kakuhle kokwakhiwa kwee-slurries ze-samente.HPMCitshintsha iimpawu ze-rheological ze-sement slurry ukwenzela ukuba i-slurry ibe ne-fluidity engcono kunye nokumelana nokuhamba okuphantsi. Oku akuncedi nje ukuphucula ukusebenza kunye nesiphumo sokugquma kwesamente, kodwa kunceda ukunciphisa ilahleko yezixhobo ezibangelwa yi-viscosity egqithisileyo ye-slurry ngexesha lenkqubo yokwakha.
5. Ukuphucula ukuxhathisa kokuqhekeka kwesamente
Ukongezwa kwe-HPMC kunokuphucula amandla okudibanisa kunye nokumelana nokuqhekeka kwesamente. Emva kokuba udaka lwesamente luqina, isakhiwo se-fibrous esakhiwe yi-HPMC sinokunciphisa iintanda ezibangelwa yimiba enjengokomisa i-shrinkage kunye nokutshintsha kobushushu kwi-samente ukuya kwinqanaba elithile, ngaloo ndlela kuphuculwe ukuxhathisa ukuqhekeka kwesamente. Ngokukodwa xa kwakhiwa kwiindawo ezinzima ezifana nokushisa okuphezulu kunye nomswakama ophezulu, ukusetyenziswa kwe-HPMC kunokunciphisa kakhulu ukuvela kweentanda, ngaloo ndlela kuphuculwe umgangatho opheleleyo wesakhiwo.
(3) Imizekelo yokusetyenziswa kwe-HPMC kwisamente
Udaka olomileyo: I-HPMC isetyenziswa kakhulu kudaka olomileyo. Inokuphucula kakhulu ukusebenza kodaka, ukwandisa ukugcinwa kwamanzi kunye nokulibazisa ixesha lokuqala lokumisela. Kwizinto zokwakha ezifana neengubo zodonga lwangaphandle, i-adhesives ye-tile, kunye ne-plastering mortars, isixa se-HPMC esongeziweyo sihlala siphakathi kwe-0.1% kunye ne-0.3%. Inokuqinisekisa ukuba udaka alulula ukuwomisa ngexesha lokwakha kwaye luqinisekisa ukwakhiwa kakuhle.
I-Self-leveling Cement: I-Self-leveling cement yinto ye-samente ene-fluidity egqwesileyo kunye neempawu zokuzalisa. Ihlala isetyenziselwa ukulinganisa umhlaba, ukulungiswa kunye nezinye iiprojekthi. Njenge-ejenti yokuqinisa kunye nokugcina amanzi, i-HPMC inokuphucula i-rheology ye-samente yokulinganisa, okwenza kube lula ukusebenza kunye nokufana okufanayo ngexesha lokwakha.
Ukulungisa i-samente: Phakathi kwezinto zokulungisa i-samente, i-HPMC inokuphucula ukubambelela kunye nokuzinza kwezinto eziphathekayo, ukuthintela izinto ukuba zome ngokukhawuleza kwaye zandise ukusebenza kwezinto zokulungisa.
Njengomxube obalulekileyo wesamente, i-HPMC iphucula kakhulu ukusebenza kwesamente kwaye iphucula ukusebenza kakuhle kolwakhiwo kunye nomgangatho weprojekthi ngemisebenzi emininzi efana nokujiya, ukugcinwa kwamanzi, kunye nokuncipha kokuseta. Ukusetyenziswa kwayo kwintlama yesamente ayiphuculi nje kuphela ulwelo kunye nokwandisa ixesha lokumisela okokuqala, kodwa kwandisa ukugcinwa kwamanzi, ukuchasana nokuqhekeka kunye neempawu ze-rheological. Njengoko ishishini lokwakha liqhubeka nokuphucula iimfuno zalo kumgangatho wokwakha kunye nokusebenza kakuhle, i-HPMC, njengesongezo sezoqoqosho kunye nokusingqongileyo, iya kusetyenziswa ngokubanzi kwi-samente kunye nezinye izinto zokwakha.
Ixesha lokuposa: Nov-08-2024