Ithonya le-polymer powder ehlakazekile ngezinto zokwenziwa kosimende

I-PlatexPlerible Latex Powder iyizinto ezivame ukusetshenziswa kwe-organic gelling. Kuyimpuphu etholwe ngokufafaza ukumisa i-polymer emulsion nge-polyvinyl alcohol njenge-colloid evikelayo. Le mpuphu ingahlakazwa kabusha emanzini ngokusobala ngemuva kokubhekana namanzi. , kwakha i-emulsion. Ukungezwa kwe-polymer powder ehlakazekile kungathuthukisa ukusebenza kokugcinwa kwamanzi kodaka olusha lwamanzi, kanye nokusebenza kwebhondi, ukuguquguquka, ukungavikeleki kanye nokuphikiswa kokugqwala kodaka kosimende olukhuni. Lokhu okulandelayo kwethula inqubo ye-polymer powder evuselelayo ku-usimende kasimende kanye nethonya lawo ekusebenzeni kosimende kasimende.

Imiphumela kwinqubo ye-Cement Hydration bese unamathisela isakhiwo

Uma nje impahla esekwe kuthumela ingeziwe ngamanzi okuxhumana nge-latex powder amanzi, ukusabela kwe-hydration kuqala, isixazululo se-calcium hydroxide ngokushesha kwakheka, futhi ngasikhathi sinye, futhi ngasikhathi sinye, futhi ngasikhathi sinye, futhi ngasikhathi sinye, izinhlayiya ze-emulsion. Ngenqubekela phambili ye-hydration reaction, imikhiqizo ye-hydration yanda, futhi izinhlayiya ze-polymer kancane kancane zihlanganiswe ku-capillary pores futhi zakha isendlalelo esiseduze kakhulu ebusweni be-gel kanye ne-informydrated cement. Izihlanzi ezihlanganisiwe ze-polymer kancane kancane zagcwalisa ama-pores capillary, kepha azikwazanga ukugcwalisa ngokuphelele indawo yangaphakathi yama-pores angenasisekelo. Njengoba i-hydration noma ukomisa kunciphisa umswakama ngokuqhubekayo, izinhlayiya ze-polymer zigcwele i-gel nakwi-pores coalesce ibe yifilimu eqhubekayo, yakha ingxube ye-hydrating cement kanye nokwenza ngcono ukubopha kwe-hydrative komkhiqizo ku-aggregate. Ngoba umkhiqizo we-hydration nge-polymer kwakha isendlalelo sesembozo esibonakalayo, kungathinta ukukhula kwamakristalu e-ettringite kanye ne-coarse calcium hydroxide crystals; Futhi ngoba i-polymer ihlangana kwifilimu kuma-pores we-interface defence zone, okwenza i-polymer cement-based Material indawo yokuguqula inguquko. Amaqembu asebenzayo kuma-molecule athile we-polymer azoba nokusabela okuxhumanisa ne-CA2 +, A13 +, njll. Ku-Conment Hydration Product, ethuthukisa ukucindezelwa kwangaphakathi, ukunciphisa ukucindezelwa kwangaphakathi, ukunciphisa ukugcwaliseka kwama-microcracks. Njengoba isakhiwo se-cement gel gemusi sikhula, amanzi ancishisiwe futhi izinhlayiya ze-polymer zivalelwa kancane kancane kuma-capillary pores. Ngokwengeziwe kwe-hydration kasimende, amanzi ase-capillary pores ancipha, futhi izinhlayiya ze-polymer zihlangana ebusweni bomkhiqizo we-gemende hydration gel / ukuhlanganisa inhlanganisela ye-cemery yomkhiqizo we-cel hl / agregate, kwakha izinhlayiya eziqinile ezinama-polymer.

Iqhaza le-polymer powder ehlakazekile ngodaka lulawulwa yizinqubo ezimbili ze-Conment Hydration kanye ne-polymer ifilimu. Ukwakheka kohlelo lwenhlanganisela lwe-Cement Hydration kanye ne-polymer film ukwakheka kwenziwa ngezinyathelo ezi-4:

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(3) Izinhlayiya ze-polymer zakha ungqimba oluqhubekayo noluqinile lokufaka okuqinile;

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I-emulsion yokuhlakazeka ye-polymer powder evuselelayo ingakha i-water-infoluble film (polymer inethiwekhi) ngemuva kokomiswa, futhi leli nethiwekhi eliphansi le-modulus polymer lingathuthukisa ukusebenza kukasimende; Amanye amaqembu ama-polar alolosi simende asabela ngamakhemikhali ngomkhiqizo we-CEMAN PYDRATION Product ukwakha isibopho esikhethekile sebhuloho, ethuthukisa ukwakheka komkhiqizo we-hydration futhi anciphise futhi anciphise isizukulwane semifantu. Ngemuva kokuthi kufakwe i-polymer powtermer powder, izinga lokuqala le-hydration le-cydration lehlisiwe, futhi ifilimu le-polymer lingashintshana ngokwengxenye noma lisonge ngokuphelele izinhlayiya zensimbi, ukuze usimende lungathuthukiswa ngokuphelele futhi izikhala zalo ezahlukahlukene zingathuthukiswa.

Ithonya emandleni ebhondi ezinto zokwakha usimende

I-Emulsion ne-polymer powder ehlakazekile ingakha amandla aphezulu ashubile namandla e-bond ngezinto ezahlukahlukene ngemuva kokwakhiwa kwamafilimu. Zihlanganiswe nosimende we-Inorganic Binder njenge-binder yesibili ngodaka. Usimende kanye ne-polymer kudla ngokulandelana okukhethekile, ukuze ukusebenza kodaka kungathuthukiswa. Ngokubheka impahla ye-miscmer-cement composite ebonakalayo, kukholelwa ukuthi ukungezwa kwe-polymer powder evuselelayo kungenza i-polymer powder futhi ibe yingxenye yodonga lwe-pore. Amandla ahlanganisiwe, ngaleyo ndlela akhuphule ukuncipha kokucindezelwa kodaka nokwandisa ubunzima bokugcina. Ukusebenza kwesikhathi eside kwe-polymer powder elungiselelwe kabusha ku-jontar wafundwa. Yabonwa nge-SEM ukuthi ngemuva kweminyaka eyi-10, i-microscicture kanye ne-morphology ye-polymer kudaka kuhlala kungashintshiwe, ukulondolozwa kobuhlobo obuzinzile, ukumelana nezimo nokuvimba. amandla kanye ne-hydrophopobicity enhle. Wang ziming et al. . Inqubo, i-polymer nayo inomthelela kwinqubo ye-hydration kanye ne-shrinkage ye-cents ku-binder. Umphumela omuhle kakhulu, wonke ozoba nosizo olungcono lokuthuthukisa amandla webhondi.

Ukungeza i-latex ye-latex evuselelayo ukuze udaka angathuthukisi kakhulu amandla e-bond nezinye izinto zokwakha, ngoba i-hydrophilic latex powder ukumiswa kwesimende kanye ne-capillaries ye-matrix ndawonye, ​​futhi i-latex powder ingena kuma-pores kanye nama-capillaries. Ifilimu langaphakathi yakhiwa futhi i-adsbed eqinile ebusweni be-substrate, ngaleyo ndlela iqinisekise amandla amahle e-bond phakathi kokufakazelwa kohlamvu kanye ne-substrate.

Ukusebenziseka kahle kokusebenza kokusebenza kodaka yi-latex powder ukuthi i-latex powder iyi-polymer ephezulu yamangqamuzana anamaqembu ama-polar. Lapho i-latex ye-latex ixubene nezinhlayiya ze-EPS, izingxenye ezingezona ze-polar ku-polymer main chain ye-latex powder yi-adsorption engokomzimba izokwenzeka nge-EPS engeyona eye-polar ye-EPS. Amaqembu ama-polar e-polymer athambekele ngaphandle ebusweni bezinhlayiya ze-EPS, ukuze izinhlayiya ze-EPS ziguqukele kusuka ku-hydrophobicity ku-hydropholity. Ukuntanta, inkinga yokubekwa kodaka okukhulu. Ngalesi sikhathi, ungeza usimende nokuxuba, amaqembu ama-polar adslorbed ebusweni bezinhlayiya ze-EPS axhumana nezinhlayiya ze-EPS futhi ahlanganise eduze, ukuze ukusebenziseka kodumo kudunyiswa kwe-EPS kwenziwa ngcono. Lokhu kubonakaliswa eqinisweni lokuthi izinhlayiya ze-EPS zimangele kalula yi-slurry kasimende, futhi amandla ahlanganisayo phakathi kwalezi ezimbili athuthukiswa kakhulu.

Ithonya ekuguqukeni kwezinto zokwenziwa kosimende

I-Fleatex Tleatex Latex ingathuthukisa amandla aguqukayo, amandla okunamathela kanye nezinye izakhiwo zodaka ngoba ingakha ifilimu le-polymer ebusweni bezinhlayiya zodaka. Kukhona ama-pores ebusweni befilimu, futhi ingaphezulu lama-pores ligcwele ngodaka, ukuze ukuncipha kwengcindezi kuncishisiwe. Futhi ngaphansi kwesenzo samandla angaphandle kuzoveza ukuphumula ngaphandle komonakalo. Ngaphezu kwalokho, lo wesiloti wakha amathambo aqinile ngemuva kokuthi usimende unama-hydrate, futhi i-polymer emathanjeni inomsebenzi wokuhlangana okuhambisanayo, okufana nezicubu zomzimba womuntu. Ifilimu eyakhiwa yi-polymer ingaqhathaniswa namalunga nama-ligaments, ngaleyo ndlela iqinisekise ukuqina nokuqina.

Ku-polymer-modimed moderswater system, ifilimu eqhubekayo nephelele ye-polymer ihlanganiswe ne-casse paste kanye nezinhlayiya zesihlabathi, okwenza lonke imfucumfucu ligcwalise lonke, futhi ngasikhathi sinye ukugcwalisa lonke inethiwekhi. Ngakho-ke, ifilimu le-polymer lingadlulisela ngempumelelo ingcindezi nokungezwani okunwebekile. Ifilimu le-polymer lingavala imifantu ye-shrinkage e-polymer-dutar interface, yenza ukuqhekeka okuqhekekile kuphulukisa, futhi kuthuthukise ukubekeka konke kanye nokubumbana kodaka. Ukuba khona kwezizinda ze-polymer eziguquguqukayo kakhulu futhi eziphakeme kakhulu kuthuthukisa ukuguquguquka nokuqina kodaka, ukuhlinzeka ngokuziphatha okuhlangene futhi okunamandla ku-skeleton eqinile. Lapho kusetshenziswa amandla angaphandle, inqubo yokusakazwa kwe-microcrack iyabambezeleka ngenxa yokuthuthuka ekuguqukeni nasekuthuthukisweni kuze kube yilapho izingcindezi eziphakeme zifinyelelwa. Izizinda ze-Pelmer ezihlanganisiwe nazo zidlala indima ekuvinjelweni ukuhlanganiswa kwama-microcracks kuma-past-fay-fars. Ngakho-ke, i-polymer powder ehlakazekile inyusa ukucindezela nokwehluleka kwezinto ezibonakalayo.

Ithonya ekuqukeni kwezinto zokwenza usimende esekwe

Ukwakheka kwamafilimu aqhubekayo we-polymer kubaluleke kakhulu kwizakhiwo ze-polymer-mon woman. Ngesikhathi sokusetha kanye nenqubo eqinile yokunamathisela kosenti, imithambo eminingi izokhiqizwa ngaphakathi, okuba yizingxenye ezibuthakathaka zokunamathisela kosenzi. Ngemuva kokuthi i-polymer polymer powder yengezwa, i-polymer powder ihlakazeka ngokushesha ibe yi-emulsion ukuxhumana namanzi, futhi iqongelela endaweni enothile (ie, emgodini). Njengoba unamathisela usimende futhi uthuthuka, ukunyakaza kwezinhlayiya ze-polymer kuba kukhawulelwe ngokwengeziwe, futhi ukungezwani okuthe xaxa phakathi kwamanzi nomoya kubangela ukuba kuhambisane kancane kancane. Lapho izinhlayiya ze-polymer ziqala ukuxhumana nazo, amanzi kunethiwekhi avele aqhamuke ngama-capillaries, futhi i-polymer yakha ifilimu eqhubekayo ezungeze umgodi, iqinisa lezi zindawo ezibuthakathaka. Ngalesi sikhathi, ifilimu le-polymer alikwazi ukudlala nje ngendima ye-hydrophobic kuphela, kodwa futhi ngeke ivimbele i-capillary, ukuze impahla ine-hydrophopobicity enhle kanye nokuvunyelwa komoya.

Usimende usimende ngaphandle kokungeza i-polymer uxhumeke kakhulu. Ngokuphambene nalokho, udaka olusimende oluguquliwe lwe-polymer lwenza lonke udaka luxhumeke kakhulu ngenxa yokuba khona kwefilimu ye-polymer, ngaleyo ndlela kutholwe izakhiwo ezingcono zokwelapha kanye nokumelana nesimo sezulu. ucansi. Ku-latex eguqulwa usimende oguquliwe, ufulawa we-latex uzokwandisa i-pososion kasimende, kepha wehlise ukuguquguquka kwesimo sokuguqulwa kwesilo phakathi kwesikejana sokunamathisela kosimende kanye ne-aggregate, ukuze kuguqulwe ngokuphelele, ukuze kuguqulwe ngokuphelele ngodaka. Ngemuva kokuthi i-latex powder yakhiwa kwifilimu, ama-pores ku-gundar angavinjelwa kangcono, ukuze ukwakheka kwe-allmeability indawo eguquguqukayo, kanye nekhono lokumelana nodaka lwe-latex olushintshiwe, kanye nekhono lokumelana nokuguguleka kwabezindaba eziyingozi kuyathuthukiswa. Inomphumela omuhle ekuthuthukisweni kokuqina kodaka.

Njengamanje, i-polymer powder ehlakazekile idlala indima ebalulekile njengesengezo sodaka lokwakha. Ukungeza i-latex ye-latex evuselelayo ku-turnar ingalungiselela imikhiqizo ehlukahlukene yodumbu efana nokunamathela okunama-tile, udaka oluzimele, udaka olubuyiselwe, udaka lokuhlobisa, ukulungiswa kodaka nokulungiswa kwamanzi amanzi. Ukusebenza kwesicelo kanye nokwenza kohlelo lokwakha udaka. Vele, kunezinkinga zokuvumelana nezimo phakathi kwe-polymer powder ehlakazekile kanye nosimende, ama-admixture kanye nama-admixtures, okufanele anikezwe ukunakwa ngokwanele kwizicelo ezithile.