I-admixture inefuthe elihle ekuphuculeni ukusebenza kodaka oluxubileyo lokwakha. I-latex powder ehlaziywayo yenziwe nge-emulsion ekhethekileyo ye-polymer emva kokumisa isitshizi. Umgubo welatex owomileyo ngamasuntswana angqukuva angama-80 ~ 100mm aqokelelwe ndawonye. Ezi ngqungquthela zinyibilika emanzini kwaye zenze i-dispersion ezinzileyo inkulu kancinane kuneengqungquthela ze-emulsion zangaphambili, ezenza ifilimu emva kokuphelelwa ngamanzi kunye nokomisa.
Amanyathelo okuguqula ahlukeneyo enza ukuba i-latex powder ephindwe kwakhona ibe neepropati ezahlukeneyo ezifana nokuxhathisa kwamanzi, ukuxhathisa kwe-alkali, ukumelana nemozulu kunye nokuguquguquka. I-latex powder esetyenziselwa udaka inokuphucula ukuxhathisa impembelelo, ukuhlala ixesha elide, ukuxhathisa ukunxiba, ukukhululeka kokwakhiwa, ukomelela kokubambisana kunye nokubambisana, ukumelana nemozulu, ukuchasana nomkhenkce, ukugxotha amanzi, amandla okugoba kunye namandla okuguquguquka kodaka. Ngokukhawuleza ukuba izinto ezisekelwe kwi-samente zongezwa nge-latex powder zidibanisa namanzi, i-hydration reaction iqala, kwaye isisombululo se-calcium hydroxide ngokukhawuleza sifikelela kwi-saturation kunye ne-crystals iyancipha, kwaye ngexesha elifanayo, i-crystals ettringite kunye ne-calcium silicate hydrate gels zenziwa. Iingqungquthela eziqinileyo zifakwe kwi-gel kunye neengqungquthela ze-samente ezingenamanzi. Njengoko i-hydration reaction iqhubeka, iimveliso ze-hydration zanda, kwaye iinqununu ze-polymer ziqokelela ngokuthe ngcembe kwi-capillary pores, zenza i-densely packed layer on the surface of the jel and on unhydrated particles cement particles. Amasuntswana e-polymer ahlanganisiweyo ngokuthe ngcembe azalise i-pores.
I-powder ye-latex ye-redispersible inokuphucula iipropati zodaka ezifana namandla okuguquguquka kunye namandla okunamathela, kuba inokwenza ifilimu ye-polymer ebusweni bamaqhekeza omdaka. Kukho ama-pores ebusweni befilimu, kwaye ubuso be-pores buzaliswe ngodaka, okunciphisa uxinzelelo loxinzelelo. Kwaye phantsi kwesenzo samandla angaphandle, kuya kuvelisa ukuphumla ngaphandle kokuphuka. Ukongezelela, udaka lwenza i-skeleton eqinile emva kokuba i-samente ifakwe emanzini, kwaye i-polymer kwi-skeleton inomsebenzi wokudibanisa okuhambayo, okufana nezicubu zomzimba womntu. I-membrane eyenziwe yi-polymer inokuthelekiswa namalungu kunye nemigqa, ukwenzela ukuba kuqinisekiswe ukuqina kunye nokuguquguquka kwe-skeleton eqinile. ubunzima.
Kwi-polymer-modified cement mortar system, ifilimu ye-polymer eqhubekayo kwaye epheleleyo idibeneyo kunye ne-samente ye-samente kunye neengqungquthela zesanti, okwenza udaka lonke lube lukhuni kunye ne-denser, kwaye ngexesha elifanayo lenza yonke inethiwekhi ye-elastic ngokuzalisa i-capillaries kunye ne-cavities. Ke ngoko, ifilimu yepolymer inokuhambisa ngokufanelekileyo uxinzelelo kunye noxinzelelo lwe-elastic. Ifilimu ye-polymer ingakwazi ukuvala i-shrinkage cracks kwi-interface ye-polymer-mortar, iphilise i-shrinkage cracks, kwaye iphucule ukutywinwa kunye namandla adibeneyo odaka. Ubukho beendawo eziguquguqukayo kakhulu kunye nezinwebekayo zepolymer ziphucula ukuguquguquka kunye nokuqina kodaka, ukubonelela ngokuhambelana kunye nokuziphatha okuguquguqukayo kwi-skeleton eqinile. Xa kusetyenziswe amandla angaphandle, inkqubo yokusabalalisa i-microcrack ilibazisekile ngenxa yokuguquguquka okuphuculweyo kunye no-elasticity de kufike uxinzelelo oluphezulu. Imimandla ye-polymer edibeneyo iphinda isebenze njengesithintelo kwi-coalescence ye-microcracks kwi-cracks engena. Ngoko ke, i-polymer powder ehlaziywayo iphucula uxinzelelo lokungaphumeleli kunye nokungaphumeleli kwezinto eziphathekayo.
Ixesha lokuposa: Mar-10-2023