Kwiminyaka yakutshanje, kunye nophuhliso oluqhubekayo lweteknoloji yokufakelwa kwodonga lwangaphandle, inkqubela phambili eqhubekayo yobugcisa bokuvelisa i-cellulose, kunye neempawu ezibalaseleyo ze-HPMC ngokwayo, i-HPMC isetyenziswe ngokubanzi kwishishini lokwakha.
Ukuze kuqhutyekwe nokuphonononga indlela yokusebenza phakathi kwe-HPMC kunye nezixhobo ezisekelwe kwi-samente, eli phepha lijolise ekuphuculeni umphumo we-HPMC kwiipropati ezihambelanayo zezinto ezisekelwe kwi-samente.
ixesha lokujika
Ixesha lokumisela ikhonkrithi ikakhulu enxulumene nokubeka ixesha lesamente, kwaye aggregate inempembelelo encinane, ngoko ke ixesha ukusetwa kodaka ingasetyenziswa endaweni ukufunda impembelelo HPMC kwi ixesha ukusetwa umxube concrete non-dispersible ngaphantsi kwamanzi, ngenxa yokuba ixesha lokumisa lomdaka lichaphazeleka ngamanzi Ngoko ke, ukwenzela ukuba kuhlolwe impembelelo ye-HPMC ngexesha lokumisela udaka, kuyimfuneko ukulungisa umlinganiselo wamanzi-samente kunye nomlinganiselo wodaka lodaka.
Ngokutsho kovavanyo, ukongezwa kwe-HPMC kunempembelelo ebalulekileyo yokunciphisa umxube wodaka, kwaye ixesha lokumisela lodaka likhula ngokulandelelana ngokunyuka komxholo we-HPMC. Ngaphantsi komxholo ofanayo we-HPMC, udaka olubunjiweyo lwangaphantsi kwamanzi lukhawuleza kunodaka olwenziwe emoyeni. Ixesha lokumisela lokubumba eliphakathi lide. Xa kulinganiswa emanzini, xa kuthelekiswa nomfanekiso ongenanto, ixesha lokumisela lodaka oluxutywe ne-HPMC lulibaziseke kwiiyure ze-6-18 zokuseta kokuqala kunye neeyure ze-6-22 zokumisela okokugqibela. Ngoko ke, i-HPMC kufuneka isetyenziswe ngokudibeneyo ne-accelerators.
I-HPMC i-polymer ephezulu ye-molecular ene-macromolecular linear structure kunye neqela le-hydroxyl kwiqela elisebenzayo, elinokuthi lenze iibhondi ze-hydrogen kunye neemolekyuli zamanzi ezixutywayo kunye nokwandisa i-viscosity yamanzi okuxuba. Amatyathanga eemolekyuli amade e-HPMC aya kutsala omnye komnye, enze iimolekyuli ze-HPMC zihlangane ukuze zenze isakhiwo sothungelwano, ukusonga isamente kunye nokuxuba amanzi. Ekubeni i-HPMC yenza i-network structure efana nefilimu kwaye isonge i-cement, iya kuthintela ngokufanelekileyo ukuguquguquka kwamanzi kumdaka, kwaye ithintele okanye icothise isantya se-hydration ye-cement.
Ukopha
Imeko yokopha yodaka iyafana naleyo yekhonkrithi, nto leyo eya kubangela ukuhlaliswa okunzulu, okukhokelela ekwandeni komlinganiselo wesamente wamanzi womgangatho ophezulu wodaka, obangela ukushwabana kweplastiki enkulu yodaka oluphezulu ekuqaleni. nqanaba, kunye nokuqhekeka, kunye nokomelela komgangatho womgangatho we-slurry Ubuthathaka ngokulinganayo.
Xa i-dosage ingaphezulu kwe-0.5%, akukho nto yokopha ngokusisiseko. Oku kungenxa yokuba xa i-HPMC ixutywe kudaka, i-HPMC ine-film-forming kunye nesakhiwo sothungelwano, kunye ne-adsorption yamaqela e-hydroxyl kwikhonkco elide le-macromolecules yenza i-samente kunye nokuxuba amanzi kwi-mortar yenza i-flocculation, iqinisekisa isakhiwo esizinzileyo. yodaka. Emva kokongeza i-HPMC kudaka, amaqamza omoya amancinci amaninzi azimeleyo aya kwenziwa. La maqamza omoya aya kusasazwa ngokulinganayo kudaka kwaye athintele ukubekwa kweaggregate. Ukusebenza kobugcisa be-HPMC kunempembelelo enkulu kwizinto ezisekelwe kwisamente, kwaye isoloko isetyenziselwa ukulungisa izinto ezintsha ezixutywe ngesamente ezifana nodaka olomileyo lomgubo kunye nodaka lwepolymer, ukwenzela ukuba ibe nokugcinwa kakuhle kwamanzi kunye nokugcinwa kweplastiki.
Imfuno yamanzi ngodaka
Xa isixa se-HPMC sincinci, sinempembelelo enkulu kwimfuno yamanzi yodaka. Kwimeko yokugcina iqondo lokwandiswa kodaka olutsha ngokusisiseko ngokufanayo, umxholo we-HPMC kunye nemfuno yamanzi yokutshintsha kodaka kubudlelwane bomgca ngaphakathi kwexesha elithile, kwaye imfuno yamanzi yodaka iyancipha kuqala kwaye iyanda. ngokucacileyo. Xa isixa se-HPMC singaphantsi kwe-0.025%, kunye nokunyuka kwesixa, imfuno yamanzi yodaka iyancipha phantsi kweqondo elifanayo lokwandisa, ebonisa ukuba xa isixa se-HPMC sincinci, sinesiphumo sokunciphisa amanzi udaka, kunye ne-HPMC inefuthe lokungenisa umoya. Kukho inani elikhulu lamaqamza omoya amancinci azimeleyo kudaka, kwaye la maqamza omoya asebenza njengesithambiso sokuphucula ukumanzi kodaka. Xa idosi ingaphezulu kwe-0.025%, imfuno yamanzi yodaka inyuka ngokunyuka kwedosi. Oku kungenxa yokuba ulwakhiwo womnatha HPMC ngakumbi epheleleyo, kwaye umsantsa phakathi flocs kwitsheyini elide molecular ifinyeziwe, nto leyo enesiphumo umtsalane kunye nomanyano, kwaye kunciphisa fluidity lodaka. Ngoko ke, phantsi kwemeko yokuba iqondo lokwandiswa ngokusisiseko liyafana, i-slurry ibonisa ukwanda kwemfuno yamanzi.
01. Uvavanyo lokuxhathisa ukusasazeka:
I-Anti-dispersion isalathiso esibalulekileyo sobugcisa ukulinganisa umgangatho we-anti-dispersion agent. I-HPMC yikhompawundi yepolymer enyibilikayo emanzini, eyaziwa ngokuba yintlaka enyibilikayo emanzini okanye ipolima enyibilikayo emanzini. Yandisa ukuhambelana komxube ngokunyusa i-viscosity yamanzi okuxuba. Yinto ye-hydrophilic polymer material enokuthi inyibilike emanzini ukwenza isisombululo. okanye ukusasazeka.
Iimvavanyo zibonisa ukuba xa inani le-naphthalene-based-high-efficiency superplasticizer linyuka, ukongezwa kwe-superplasticizer kuya kunciphisa ukuxhathisa ukusasazeka kwe-sand mortar esanda kuxutywa. Oku kungenxa yokuba isinciphisi samanzi esisekwe kwi-naphthalene sisebenza ngokugqithisileyo. Xa umnciphisi wamanzi wongezwa kumdaka, umnciphisi wamanzi uya kujoliswa kumphezulu weengqungquthela zesamente ukwenza umphezulu weengqungquthela zesamente zibe nentlawulo efanayo. Le ngqungquthela yombane yenza iinqununu zesamente Isakhiwo se-flocculation ye-cement sichithwa, kwaye amanzi ahlanganiswe kwisakhiwo akhululwa, okuya kubangela ukulahlekelwa kwenxalenye yesamente. Kwangaxeshanye, kufunyaniswe ukuba ngokunyuka komxholo we-HPMC, ukuxhathisa ukusasazwa kodaka olutsha lwesamente kubangcono kwaye kubengcono.
02. Iimpawu zamandla zekhonkrithi:
Kwiprojekthi yokulinga isiseko, i-HPMC engaphantsi kwamanzi exutywayo yekhonkrithi engasasazwanga yasetyenziswa, kwaye ibakala lamandla oyilo laliyi-C25. Ngokutsho kovavanyo olusisiseko, inani le-samente yi-400kg, i-silica fume edibeneyo yi-25kg / m3, inani elifanelekileyo le-HPMC yi-0.6% yesixa se-samente, umlinganiselo wamanzi-samente ngu-0.42, umlinganiselo wesanti ngu-40%. kunye nemveliso ye-naphthalene-based high-efficiency water reducer is Ubungakanani besamente yi-8%, umyinge wama-28d amandla isampuli yekhonkrithi emoyeni yi-42.6MPa, i-28d ye-avareji yamandla ekhonkrithi ephantsi kwamanzi kunye nokuphakama kwe-drop ye-60mm yi-36.4MPa, kunye nomlinganiselo wamandla wekhonkrithi eyenziwe ngamanzi kwi-concrete eyenziwe ngomoya yi-84.8%, umphumo kubaluleke ngakumbi.
03. Iimvavanyo zibonisa:
(1) Ukongezwa kwe-HPMC kunempembelelo ecacileyo yokunciphisa umxube wodaka. Ngokunyuka komxholo we-HPMC, ixesha lokumisela lodaka liyandiswa ngokulandelelana. Ngaphantsi komxholo ofanayo we-HPMC, udaka olwenziwe phantsi kwamanzi lukhawuleza kunolo lwenziwe emoyeni. Ixesha lokumisela lokubumba eliphakathi lide. Olu phawu luluncedo ekumpompeni ikhonkrithi ephantsi kwamanzi.
(2) Udaka lwesamente olusandul’ ukuxutywa oluxutywe nehydroxypropyl methylcellulose luneempawu ezintle ezidityanisiweyo kwaye luphantse lungophi.
(3) Isixa se-HPMC kunye nesidingo samanzi sodaka sehle kuqala kwaye sanyuka ngokucacileyo.
(4) Ukudityaniswa kwe-arhente yokunciphisa amanzi kuphucula ingxaki yokwanda kwesidingo samanzi sodaka, kodwa umthamo walo kufuneka ulawulwe ngokufanelekileyo, kungenjalo ukuxhathisa kokusasazeka ngaphantsi kwamanzi kodaka oluxutyiweyo lwesamente olusanda kuxutywa luya kuncitshiswa ngamanye amaxesha.
(5) Kukho umahluko omncinane kulwakhiwo phakathi kwesamente yokuncamathisela yesamente exutywe ne-HPMC kunye nesampulu engenanto, kwaye kukho umahluko omncinci kwisakhiwo kunye nokuxinana kwesamente yokuncamathisela yesamente egalelwe emanzini nasemoyeni. Umzekelo owenziwe phantsi kwamanzi kangangeentsuku ezingama-28 ukhephuke kancinci. Isizathu esiphambili kukuba ukongezwa kwe-HPMC kunciphisa kakhulu ilahleko kunye nokusasazwa kwesamente xa ugalela emanzini, kodwa kunciphisa ukubumbana kwelitye lesamente. Kwiprojekthi, phantsi komqathango wokuqinisekisa umphumo wokungasasazwa phantsi kwamanzi, i-dosage ye-HPMC kufuneka incitshiswe kangangoko kunokwenzeka.
(6) Ukongeza HPMC ngaphantsi kwamanzi non-dispersible ikhonkrithi admixture, ukulawula idosi kunenzuzo amandla. Iprojekthi yokulinga ibonisa ukuba umlinganiselo wamandla wekhonkrithi eyenziwe ngamanzi kunye nekhonkrithi eyenziwe ngomoya yi-84.8%, kwaye umphumo ubaluleke kakhulu.
Ixesha lokuposa: May-06-2023