Ngokushesha nje lapho izinto ezisekelwe ku-cement zengezwe nge-latex powder zithintana namanzi, ukusabela kwe-hydration kuqala, futhi isisombululo se-calcium hydroxide ngokushesha sifinyelela ukugcwala futhi amakristalu ayancishiswa, futhi ngesikhathi esifanayo, amakristalu e-ettringite nama-gel e-calcium silicate hydrate akhiwa.Izinhlayiya eziqinile zifakwa kujeli kanye nezinhlayiya zikasimende ezingenamanzi.Njengoba ukusabela kwe-hydration kuqhubeka, imikhiqizo ye-hydration iyakhula, futhi izinhlayiya ze-polymer kancane kancane ziqoqana emigodini ye-capillary, zenze ungqimba oluminyene olugcwele ebusweni bejeli kanye nezinhlayiya zikasimende ezingenawo amanzi.
Izinhlayiya ze-polymer ezihlanganisiwe kancane kancane zigcwalisa ama-pores, kodwa hhayi ngokuphelele endaweni engaphakathi ye-pores.Njengoba amanzi encishiswa ngokuqhubekayo nge-hydration noma ukomiswa, izinhlayiya ze-polymer ezipakishwe eduze eduze kwejeli kanye nasezimbotsheni ze-pores zihlangana zibe ifilimu eqhubekayo, zenze ingxube ehlangene ne-hydrated simende unamathisele futhi ithuthukise i-hydration Bonding yemikhiqizo kanye nama-aggregates.Ngenxa yokuthi imikhiqizo ye-hydration enama-polymers yakha isendlalelo sesembozo ku-interface, ingase ithinte ukukhula kwamakristalu e-ettringite nama-coarse calcium hydroxide;futhi ngenxa yokuthi ama-polymers ajiya abe amafilimu ezimbotsheni ze-interface transition zone, izinto ezisekelwe kusimende ze-polymer I-transition zone iminyene.Amaqembu asebenzayo kwamanye ama-molecule e-polymer azophinde akhiqize ukusabela okuxhumanisa okuphambene ne-Ca2+ ne-A13+ emikhiqizweni ye-hydration kasimende ukuze akhe amabhondi akhethekile ebhuloho, athuthukise ukwakheka komzimba kwezinto ezisekelwe kusimende eziqinile, akhulule ingcindezi yangaphakathi, futhi anciphise ukukhiqizwa kwama-microcracks.Njengoba isakhiwo sejeli sikasimende sikhula, amanzi adliwe futhi izinhlayiya ze-polymer ziboshwe kancane kancane kuma-pores.Njengoba usimende uba namanzi ngokwengeziwe, umswakama osezimbotsheni ze-capillary uyancipha, futhi izinhlayiya ze-polymer zinqwabelana phezu komkhiqizo we-cement hydration umkhiqizo wejeli/ingxube yezinhlayiyana ze-unhydrated zikasimende kanye ne-aggregate, ngaleyo ndlela yakhe ungqimba oluvaleleke oluqhubekayo olunezimbotshana ezinkulu Ezigcwalisiwe. ngezinhlayiya ze-polymer ezinamathelayo noma ezizinamathelayo.
Indima ye-latex powder ehlakazeka kabusha odakeni ilawulwa yizinqubo ezimbili ze-cement hydration kanye nokwakheka kwefilimu ye-polymer.Ukwakhiwa kwesistimu eyinhlanganisela ye-cement hydration kanye nokwakheka kwefilimu ye-polymer kuqedwa ngezinyathelo ezi-4:
(1) Ngemva kokuba impushana ye-latex ehlakazeka kabusha ixutshwe nodaka lukasimende, ihlakazwa ngokulinganayo ohlelweni;
(2) Izinhlayiya ze-polymer zifakwe ebusweni bejeli yomkhiqizo we-cement hydration / ingxube yezinhlayiya zikasimende ezingenamanzi;
(3) Izinhlayiya ze-polymer zakha ungqimba olunqwabelene oluqhubekayo noluhlangene;
(4) Ngesikhathi senqubo yokufaka usimende amanzi, izinhlayiya ze-polymer ezipakishwe eduze zihlangana zibe ifilimu eqhubekayo, ihlanganise imikhiqizo ye-hydration ndawonye ukuze yakhe isakhiwo senethiwekhi esiphelele.
I-emulsion ehlakazekile ye-latex powder e-redispersible ingenza ifilimu eqhubekayo engenamanzi (umzimba wenethiwekhi ye-polymer) ngemva kokumisa, futhi lo mzimba wenethiwekhi we-modulus polymer ophansi ungathuthukisa ukusebenza kukasimende;ngesikhathi esifanayo, ku-molecule ye-polymer Amaqembu athile e-polar kusimende asabela ngamakhemikhali nemikhiqizo ye-samente ye-hydration ukuze akhe amabhuloho akhethekile, athuthukise ukwakheka komzimba wemikhiqizo ye-cement hydration, futhi anciphise futhi anciphise ukukhiqizwa kwemifantu.Ngemuva kokuthi i-latex powder ye-redispersible ingeziwe, izinga lokuqala le-hydration likasimende liyancipha, futhi ifilimu ye-polymer ingakwazi ukugoqa kancane noma ngokuphelele izinhlayiya ze-cement, ukuze usimende ungabi namanzi ngokugcwele futhi izakhiwo zayo ezihlukahlukene zingathuthukiswa.
Impushana ye-latex ehlakazeka kabusha idlala indima ebalulekile njengesengezo kudaka lokwakha.Ukwengeza impushana ye-latex ehlakazeka kabusha odakeni kungalungisa imikhiqizo ehlukahlukene yodaka efana nokunamathelisa amathayela, udaka olushisayo olushisayo, udaka oluzilinganisa, i-putty, udaka oluplastayo, udaka lokuhlobisa, i-ejenti ehlanganisayo, udaka lokukhanda kanye nezinto zokuvala ezingangeni manzi, njll. Ububanzi besicelo kanye nokusetshenziswa ukusebenza kodaka lokwakha.Yiqiniso, kunezinkinga zokuguquguquka phakathi kwe-latex powder kanye ne-cement, i-admixtures kanye ne-admixtures, okumele kunikezwe ukunakwa okwanele ezinhlelweni ezithile.
Isikhathi sokuthumela: Mar-14-2023