I-Hydroxypropyl methylcellulose iyinhlanganisela ye-polymer encibilikayo emanzini, eyaziwa nangokuthi i-resin encibilikayo emanzini noma i-polymer encibilikayo emanzini. Iqinisa ingxube ngokwandisa i-viscosity yamanzi axubayo. Iyinto ye-polymer ephilizayo emanzini. Ingancibilikiswa emanzini ukuze yakhe isixazululo noma ukuhlakazeka. Ukuhlolwa kubonisa ukuthi lapho inani le-superplasticizer esekelwe ku-naphthalene landa, ukufakwa kwe-superplasticizer kuzonciphisa ukumelana kokuhlakazeka kwe-mortar yesamente exubile esanda kuhlanganiswa. Lokhu kungenxa yokuthi i-superplasticizer ye-naphthalene iyi-surfactant. Lapho i-ejenti yokunciphisa amanzi ifakwa ku-mortar, i-ejenti yokunciphisa amanzi ihlelwe phezu kwezinhlayiya zesamente, ukuze ubuso bezinhlayiya zesamente bube nokushaja okufanayo. Lokhu kuxoshwa kukagesi kuhlukanisa isakhiwo se-flocculation esakhiwe yizinhlayiya zesamente, futhi amanzi ahlanganiswe esakhiweni ayakhishwa, okuholela ekulahlekelweni kwengxenye yesamente. Ngesikhathi esifanayo, kwatholakala ukuthi ngokwanda kokuqukethwe kwe-HPMC, ukumelana kokuhlakazeka kwe-mortar yesamente entsha kwaba ngcono kakhulu.
Izakhiwo zamandla zekhonkrithi:
Ukuhlanganiswa kwekhonkrithi engahlakazeki ngaphansi kwamanzi ye-HPMC kusetshenziswa kubunjiniyela besisekelo sebhuloho elikhulu, kanti izinga lamandla okuklama lingu-C25. Ngokusho kokuhlolwa okuyisisekelo, inani lesimende lingu-400kg, inani le-microsilica lingu-25kg/m3, inani elifanele le-HPMC lingu-0.6% wenani lesimende, isilinganiso samanzi nosimende singu-0.42, isilinganiso sesihlabathi singu-40%, kanti umphumela we-naphthyl superplasticizer ungu-8% wenani lesimende. , Amasampula ekhonkrithi asemoyeni izinsuku ezingu-28 anamandla aphakathi angu-42.6MPa, kanti ikhonkrithi ethelwe ngaphansi kwamanzi izinsuku ezingu-28 eneconsi lamanzi elingu-60mm inamandla aphakathi angu-36.4 MPa.
1. Ukwengezwa kwe-HPMC kunomphumela osobala wokulibazisa engxubeni ye-mortar. Njengoba okuqukethwe kwe-HPMC kwanda, isikhathi sokusetha i-mortar siyanda kancane kancane. Ngaphansi kokuqukethwe okufanayo kwe-HPMC, i-mortar eyakhiwe ngaphansi kwamanzi ingcono kune-mortar eyakhiwe emoyeni. Isikhathi sokuqina sokubumba side kakhulu. Lesi sici senza kube lula ukupompa ukhonkolo ngaphansi kwamanzi.
2. Udaka olusha lwesamente oluxutshwe ne-hydroxypropyl methylcellulose lusebenza kahle ekuhlanganiseni futhi aluphumi kakhulu.
3. Okuqukethwe yi-HPMC kanye nesidingo samanzi se-mortar kwehle kuqala kwabe sekwenyuka kakhulu.
4. Ukufakwa kwe-ejenti yokunciphisa amanzi kuthuthukisa inkinga yokwanda kwesidingo samanzi se-mortar, kodwa kumele ilawulwe ngokufanele, ngaphandle kwalokho ngezinye izikhathi kuzonciphisa ukumelana kokusabalala kwamanzi kwe-mortar ye-samente esanda kuhlanganiswa.
5. Kunomehluko omncane ekwakhiweni kwesampula ye-cement paste exutshwe ne-HPMC kanye nesampula engenalutho, futhi kunomehluko omncane ekwakhiweni nasekubuneni kwesampula ye-cement paste ekutheleni amanzi nomoya. Isampula eyenziwe ngemva kwezinsuku ezingu-28 ngaphansi kwamanzi ikhululekile kancane. Isizathu esiyinhloko ukuthi ukungezwa kwe-HPMC kunciphisa kakhulu ukulahleka nokusabalala kwe-cement ngesikhathi sokuthela amanzi, kodwa futhi kunciphisa ukuqina kwetshe le-cement. Kuphrojekthi, inani le-HPMC kufanele lincishiswe ngangokunokwenzeka ngenkathi kuqinisekiswa umphumela wokungasabalali ngaphansi kwamanzi.
6. Inhlanganisela ye-HPMC engaphansi kwamanzi engasabalali, ukulawulwa kwenani kuyasiza ekuthuthukiseni amandla. Amaphrojekthi okuhlola abonise ukuthi i-concrete eyakhiwe emanzini inesilinganiso samandla esingu-84.8% saleyo eyakhiwe emoyeni, futhi umphumela ubaluleke nakakhulu.
Isikhathi sokuthunyelwe: Juni-16-2023