Ngokukhawuleza ukuba izinto ezisekelwe kwi-cement 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.
Iinqununu ze-polymer ezidibeneyo zizalise ngokuthe ngcembe ii-pores, kodwa kungekhona ngokupheleleyo kwindawo yangaphakathi ye-pores.Njengoko amanzi ancitshiswa ngakumbi nge-hydration okanye ukomiswa, iinqununu ze-polymer ezifakwe ngokusondeleyo kwi-gel kunye ne-pores coalesce kwifilimu eqhubekayo, eyenza umxube odibeneyo kunye ne-hydrated cement paste kunye nokuphucula i-hydration Bonding yeemveliso kunye ne-aggregates.Ngenxa yokuba iimveliso ze-hydration ezine-polymers zenza umaleko wokugubungela kwi-interface, inokuchaphazela ukukhula kwe-ettringite kunye ne-coarse calcium hydroxide crystals;kwaye ngenxa yokuba iipolymers zidibanisa kwiifilimu kwii-pores ze-interface transition zone, izinto ezisekelwe kwi-samente ye-polymer Indawo yokutshintsha i-denser.Amaqela asebenzayo kwezinye iimolekyuli ze-polymer nazo ziya kuvelisa ukuphendula okuxhamlayo kunye ne-Ca2 + kunye ne-A13 + kwiimveliso ze-samente ze-samente ukuze zenze iibhondi ezikhethekileyo zebhuloho, ukuphucula isakhiwo somzimba wezinto eziqiniweyo ezisekelwe kwi-samente, ukunciphisa uxinzelelo lwangaphakathi, kunye nokunciphisa isizukulwana se-microcracks.Njengoko i-gel ye-cement ikhula, amanzi asetyenziswa kwaye iinqununu ze-polymer zigcinwe ngokuthe ngcembe kwiipores.Njengoko i-samente i-hydrated ngakumbi, ukufuma kwi-capillary pores kuncipha, kwaye i-polymer particles aggregate phezu komgangatho we-cement hydration product gel / unhydrated sement particle umxube kunye ne-aggregate, ngaloo ndlela yenze i-close-packed layer kunye ne-pores enkulu ezaliswe. ngamasuntswana epolymer ancamathelayo okanye azincamatheleyo.
Indima ye-latex powder ehlaziywayo kwi-mortar ilawulwa ziinkqubo ezimbini ze-cement hydration kunye nokwakheka kwefilimu ye-polymer.Ukuqulunqwa kwenkqubo edibeneyo ye-cement hydration kunye nokwakheka kwefilimu ye-polymer kugqitywe ngamanyathelo ama-4:
(1) Emva kokuba i-latex powder ehlaziywayo ixutywe kunye nodaka lwesamente, ihlakazwe ngokulinganayo kwinkqubo;
(2) Iinqununu ze-polymer zifakwe kumphezulu we-cement hydration product gel / unhydrated particle particle mix;
(3) Amasuntswana e-polymer enza umaleko oqhubekayo kunye nocwecwe;
(4) Ngethuba lenkqubo ye-cement hydration, i-polymer particles ehlanganiswe ngokusondeleyo idibanisa kwifilimu eqhubekayo, idibanisa iimveliso ze-hydration kunye zenze isakhiwo sothungelwano esipheleleyo.
I-emulsion ehlakaziweyo ye-latex powder edibeneyo inokwenza ifilimu eqhubekayo engenamanzi (i-polymer network body) emva kokumisa, kwaye lo mzimba ophantsi we-elastic modulus polymer network unokuphucula ukusebenza kwe-samente;kwangaxeshanye, kwimolekyuli yepolymer Amaqela athile e-polar kwisamente asabela ngokwekhemikhali kunye neemveliso ze-samente ze-hydration ukwenza iibhulorho ezikhethekileyo, ukuphucula isakhiwo somzimba weemveliso ze-samente hydration, kunye nokunciphisa kunye nokunciphisa ukuveliswa kweentanda.Emva kokuba i-latex powder yongezwa kwakhona, umlinganiselo wokuqala we-hydration we-cement uyancipha, kwaye ifilimu ye-polymer ingakwazi ukugoqa ngokuyinxenye okanye ngokupheleleyo i-sement particles, ukwenzela ukuba i-samente ifakwe ngokupheleleyo kunye neempawu zayo ezahlukeneyo zinokuphuculwa.
I-latex powder ephinda ikwazi ukuchithwa idlala indima ebalulekileyo njengesongezelelo sodaka lokwakha.Ukongeza umgubo welatex ophinda uhlakazeke eludaka kunokulungisa iimveliso ezahlukeneyo zodaka ezifana nokuncamathelisa kwethayile, udaka lokufakelwa kwe-thermal, udaka oluzilinganisayo, iputty, udaka lokutyabeka, udaka lokuhombisa, i-arhente yokudibanisa, udaka lokulungisa kunye nezinto zokutywina ezingangeni manzi, njl njl. ukusebenza kodaka lokwakha.Ewe kunjalo, kukho iingxaki zokuguquguquka phakathi kwe-latex powder kunye nesamente, i-admixtures kunye ne-admixtures, ekufuneka inikwe ingqwalasela eyaneleyo kwizicelo ezithile.
Ixesha lokuposa: Mar-14-2023