IHydroxypropyl methylcellulose yikhompawundi yepolymer enyibilikayo emanzini, eyaziwa ngokuba yiresin enyibilikayo emanzini okanye ipolima enyibilikayo emanzini. Iqinisa umxube ngokunyusa i-viscosity yamanzi adibeneyo. Yimathiriyeli ye-hydrophilic polymer. Inokunyibilika emanzini ukwenza isisombululo okanye ukusabalalisa. Iimvavanyo zibonisa ukuba xa isixa se-superplasticizer esekwe kwi-naphthalene sinyuka, ukudityaniswa kwe-superplasticizer kuya kunciphisa ukuxhathisa ukusasazwa kodaka oluxutyiweyo lwesamente. Oku kungenxa yokuba i-naphthalene superplasticizer yi-surfactant. Xa i-ejenti yokunciphisa amanzi yongezwa kumdaka, i-agent yokunciphisa amanzi ihlelwe phezu kweengqungquthela ze-samente, ukwenzela ukuba umgangatho weengqungquthela zesamente ube nentlawulo efanayo. Olu gxobhozo lombane luchitha ukwakhiwa kwe-flocculation eyenziwe ngamaqhekeza e-samente, kwaye amanzi ahlanganiswe kwisakhiwo akhululwa, okubangela ukulahlekelwa kwenxalenye yesamente. Kwangaxeshanye, kwafunyaniswa ukuba ngokunyuka komxholo we-HPMC, ukuxhathisa ukusasazwa kodaka olutsha lwesamente kwaba ngcono kwaye kungcono.
Iimpawu zokomelela kwekhonkrithi:
HPMC ngaphantsi kwamanzi non-dispersible ikhonkrithi admixture isetyenziswa kuhola wendlela ibhulorho isiseko ubunjineli, kunye nenqanaba amandla kuyilo C25. Ngokutsho kovavanyo olusisiseko, inani le-samente yi-400kg, inani le-microsilica 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-naphthyl superplasticizer yi-8% yemali yesamente. , Imizekelo yekhonkrithi emoyeni kangangeentsuku ezingama-28 inamandla aphakathi kwe-42.6MPa, kunye nekhonkrithi egalelwe ngaphantsi kwamanzi iintsuku ezingama-28 ngethontsi lamanzi le-60mm inomlinganiselo wamandla angama-36.4 MPa.
1. Ukongezwa kwe-HPMC kunesiphumo esicacileyo sokunciphisa umxube wodaka. Ngokunyuka komxholo we-HPMC, ixesha lokumisela lodaka ngokuthe ngcembe likhula. Ngaphantsi komxholo ofanayo we-HPMC, udaka olwenziwe ngaphantsi kwamanzi lungcono kunodaka olwenziwe emoyeni. Ixesha lokuqina lokubumba lide. Olu phawu luququzelela ukumpompa ikhonkrithi ephantsi kwamanzi.
2. Udaka olutsha lwesamente oluxutywe nehydroxypropyl methylcellulose lusebenza kakuhle kwibhondi kwaye alufane lungophi.
3. Isiqulatho se-HPMC kunye nesidingo samanzi sodaka sehle okokuqala saza sanyuka kakhulu.
4. Ukudityaniswa kwe-arhente yokunciphisa amanzi kuphucula ingxaki yokwanda kwesidingo samanzi sodaka, kodwa kufuneka kulawulwe ngokufanelekileyo, kungenjalo ngamanye amaxesha kuya kunciphisa ukuxhathisa kokusasazeka ngaphantsi kwamanzi kodaka oluxubileyo lwesamente.
5. Kukho umehluko omncinci kwisakhiwo somfanekiso we-cement paste exutywe kunye ne-HPMC kunye ne-specimen engenanto, kwaye kukho umehluko omncinci kwisakhiwo kunye nobuninzi bomfanekiso we-cement paste ekugaleleni amanzi kunye nomoya. Isampulu eyenziwe emva kweentsuku ezingama-28 ngaphantsi kwamanzi ikhululekile kancinane. Isizathu esona sizathu kukuba ukongezwa kwe-HPMC kunciphisa kakhulu ilahleko kunye nokusasazwa kwesamente ngexesha lokugalelwa emanzini, kodwa kunciphisa ukubumbana kwelitye lesamente. Kwiprojekthi, umthamo we-HPMC kufuneka uncitshiswe kangangoko kunokwenzeka ngelixa uqinisekisa umphumo wokungasasazwa phantsi kwamanzi.
6. Indibaniselwano ye-HPMC engaphantsi kwamanzi edibeneyo yekhonkrithi engabonakaliyo, ulawulo lwesixa lulungele ukuphuculwa kwamandla. Iiprojekthi zolingo zibonise ukuba ikhonkrithi eyenziwe emanzini inomlinganiselo wamandla angama-84.8% owenziwe emoyeni, kwaye umphumo ubaluleke ngakumbi.
Ixesha lokuposa: Jun-16-2023