Umphumela we-Cellulose Ether ku-Mortar Properties

Imiphumela yezinhlobo ezimbili zama-cellulose ether ekusebenzeni kodaka yacwaningwa.Imiphumela yabonisa ukuthi zombili izinhlobo ze-cellulose ethers zingathuthukisa kakhulu ukugcinwa kwamanzi odaka futhi zinciphise ukuhambisana kodaka;Amandla okucindezela ancishiswa ngamadigri ahlukene, kodwa isilinganiso sokugoqa namandla okubopha osimende akhuphuka ngamadigri ahlukene, ngaleyo ndlela athuthukise ukwakhiwa kodaka.

Amagama angukhiye:i-cellulose ether;i-ejenti yokugcina amanzi;amandla okubopha

I-Cellulose ether (MC)iphuma ku-cellulose yezinto zemvelo.I-Cellulose ether ingasetshenziswa njenge-ejenti yokugcina amanzi, i-thickener, i-binder, i-disperant, i-stabilizer, i-ejenti yokumisa okwesikhashana, i-emulsifier kanye nosizo lokwenza ifilimu, njll. Ngenxa yokuthi i-cellulose ether inokugcinwa kwamanzi okuhle kanye nomphumela wokujiya odakeni, ingathuthukisa kakhulu ukusebenza. kodaka, ngakho-ke i-cellulose ether iyi-polymer encibilika emanzini esetshenziswa kakhulu odakeni.

1. Izinto zokuhlola nezindlela zokuhlola

1.1 Izinto ezisetshenziswayo

Usimende: Usimende Ojwayelekile wasePortland okhiqizwe yi-Jiaozuo Jianjian Cement Co., Ltd., enebanga lamandla elingu-42.5.Isihlabathi: Isihlabathi esiphuzi saseNanyang, i-fineness modulus 2.75, isihlabathi esiphakathi.I-Cellulose ether (MC): I-C9101 ekhiqizwe yi-Beijing Luojian Company kanye ne-HPMC ekhiqizwe yi-Shanghai Huiguang Company.

1.2 Indlela yokuhlola

Kulolu cwaningo, isilinganiso se-lime-sand sasingu-1: 2, kanti isilinganiso samanzi-samente sasingu-0.45;i-cellulose ether yaxutshwa nosimende kuqala, bese kunezelwa isihlabathi futhi sinyakaziswa ngokulinganayo.Umthamo we-cellulose ether ubalwa ngokwephesenti lesisindo sikasimende.

Ukuhlolwa kwamandla okucindezelayo nokuhlola ukungaguquguquki kwenziwa ngokubhekiselwe ku-JGJ 70-90 “Izindlela Zokuhlola Zezakhiwo Eziyisisekelo Zodaka Lokwakha”.Ukuhlolwa kwamandla okuguquguqukayo kwenziwa ngokuya nge-GB/T 17671-1999 “Ukuhlolwa Kwamandla Othuli Lwesimende”.

Ukuhlolwa kokugcinwa kwamanzi kwenziwa ngokwendlela yephepha lokuhlunga elisetshenziswa emabhizinisini okukhiqiza ukhonkolo ofakwe umoya waseFrance.Inqubo ethize imi kanje: (1) faka izingqimba ezi-5 zephepha lokuhlunga kancane epuleti eliyindilinga lepulasitiki, bese ukala isisindo salo;(2) faka eyodwa ukuthintana ngqo nodaka Beka iphepha lokuhlunga elinesivinini esiphezulu ephepheni lokuhlunga elinesivinini esincane, bese ucindezela isilinda esinobubanzi bangaphakathi obungu-56 mm nobude obungama-55 mm ephepheni lokuhlunga elisheshayo;(3) Thela udaka kusilinda;(4) Ngemva kodaka kanye nokuxhumana kwephepha lokuhlunga imizuzu engu-15, phinda ukale Ikhwalithi yephepha lokuhlunga kancane kanye nediski yepulasitiki;(5) Bala isisindo samanzi esimuncwa iphepha lokuhlunga elinensayo endaweni yemitha yesikwele, okuyizinga lokumuncwa kwamanzi;(6) Izinga lokumuncwa kwamanzi liyi-arithmetic yemiphumela yokuhlolwa emibili.Uma umehluko phakathi kwamanani wesilinganiso udlula i-10%, ukuhlolwa kufanele kuphindwe;(7) Ukugcinwa kwamanzi kodaka kuvezwa izinga lokumuncwa kwamanzi.

Ukuhlolwa kwamandla ebhondi kwenziwa mayelana nendlela enconywe yi-Japan Society for Materials Science, futhi amandla ebhondi abonakala ngamandla aguquguqukayo.Ukuhlolwa kusebenzisa isampula yeprism usayizi wayo ongu-160mm×40mm×40mm.Isampula elijwayelekile lodaka elenziwe kusenesikhathi lalapheka laze lafinyelela eminyakeni engama-28 d, lase lisikwa libe izingxenye ezimbili.Ama-halves amabili esampula enziwe amasampula ngodaka olujwayelekile noma udaka lwe-polymer, bese elashwa ngokwemvelo ngaphakathi endlini ukuya eminyakeni ethile, bese ehlolwa ngokuya ngendlela yokuhlola amandla aguquguqukayo odaka lukasimende.

2. Imiphumela yokuhlolwa nokuhlaziya

2.1 Ukungaguquguquki

Kusukela kumphumela we-cellulose ether ekuhambisaneni kodaka, kungabonakala ukuthi ngokwanda kokuqukethwe kwe-cellulose ether, ukuvumelana kodaka ngokuyisisekelo kubonisa ukuthambekela kokwehla, futhi ukwehla kokuvumelana kodaka oluxutshwe ne-HPMC kuyashesha. kunalolo lukadaka oluxutshwe ne-C9101.Lokhu kungenxa yokuthi i-viscosity ye-cellulose ether ivimbela ukugeleza kodaka, futhi i-viscosity ye-HPMC iphakeme kunaleyo ye-C9101.

2.2 Ukugcina amanzi

Odakeni, izinto zikasimende ezifana usimende negypsum zidinga ukufakwa amanzi ngamanzi ukuze zibekwe.Inani elizwakalayo le-cellulose ether lingagcina umswakama kudaka isikhathi eside esanele, ukuze inqubo yokumisa kanye nokuqina iqhubeke.

Kusukela kumphumela wokuqukethwe kwe-cellulose ether ekugcinweni kwamanzi odaka, kungabonakala ukuthi: (1) Ngokukhula kwe-C9101 noma i-HPMC yokuqukethwe kwe-cellulose ether, izinga lokumuncwa kwamanzi odaka lehle kakhulu, okungukuthi, ukugcinwa kwamanzi udaka lwenziwe ngcono kakhulu, ikakhulukazi uma luxutshwa ne-Mortar ye-HPMC.Ukugcinwa kwawo kwamanzi kungathuthukiswa kakhulu;(2) Uma inani le-HPMC lingu-0.05% ukuya ku-0.10%, udaka luhlangabezana ngokugcwele nezidingo zokugcina amanzi ohlelweni lokwakha.

Womabili ama-cellulose ether angama-polymer angewona ama-ionic.Amaqembu e-hydroxyl kuketango lamangqamuzana e-cellulose ether kanye nama-athomu omoya-mpilo kumabhondi e-ether angakha amabhondi e-hydrogen nama-molecule amanzi, enze amanzi amahhala abe amanzi abophekile, ngaleyo ndlela adlale indima enhle ekugcineni amanzi.

Ukugcinwa kwamanzi kwe-cellulose ether ikakhulukazi kuncike ekubukekeni kwayo, usayizi wezinhlayiyana, izinga lokuqedwa kanye nenani elingeziwe.Ngokuvamile, inani elikhulu elingeziwe elingeziwe, i-viscosity ephezulu, futhi inhle kakhulu, kuyanda ukugcinwa kwamanzi.Kokubili i-C9101 kanye ne-HPMC cellulose ether inamaqembu e-methoxy ne-hydroxypropoxy ochungechungeni lwemolekyuli, kodwa okuqukethwe kwe-methoxy ku-HPMC cellulose ether kungaphezulu kwalokho kwe-C9101, futhi i-viscosity ye-HPMC iphakeme kunaleyo ye-C9101, ngakho-ke ukugcinwa kwamanzi odaka. exutshwe ne-HPMC iphakeme kunaleyo yodaka oluxutshwe nodaka olukhulu lwe-HPMC C9101.Kodwa-ke, uma i-viscosity nesisindo samangqamuzana e-cellulose ether siphezulu kakhulu, ukuncibilika kwayo kuzokwehla ngokufanele, okuzoba nomthelela omubi emandleni nasekusebenzeni kodaka.Amandla esakhiwo ukuze kuzuzwe umphumela omuhle kakhulu wokubopha.

2.3 Amandla e-Flexural namandla acindezelayo

Kusukela kumphumela we-cellulose ether emandleni aguquguqukayo kanye nokucindezela odaka, kungabonakala ukuthi ngokwanda kokuqukethwe kwe-cellulose ether, amandla aguquguqukayo kanye nokucindezela odaka ngezinsuku ezingu-7 kanye ne-28 abonise umkhuba ophansi.Lokhu kungenxa yokuthi: (1) Lapho i-cellulose ether yengezwa odakeni, ama-polymer aguquguqukayo ezimbotsheni zodaka ayakhula, futhi lawa ma-polymers aguquguqukayo awakwazi ukunikeza ukusekela okuqinile lapho i-matrix eyinhlanganisela icindezelwa.Ngenxa yalokho, amandla aguquguqukayo nokucindezela kodaka ayancipha;(2) Ngokukhula kokuqukethwe kwe-cellulose ether, umphumela wawo wokugcina amanzi uba ngcono futhi ube ngcono, ukuze emva kokwakhiwa kwebhulokhi yokuhlola udaka, i-porosity ku-block test block block, amandla okuguquguquka kanye nokucindezela azoncishiswa. ;(3) lapho udaka oluxutshwe okomile luxutshwa namanzi, izinhlayiya ze-cellulose ether latex ziqale zikhangiswe ebusweni bezinhlayiya zikasimende ukuze zenze ifilimu ye-latex, enciphisa ukugeleza kukasimende, ngaleyo ndlela kunciphise amandla kasimende. udaka.

2.4 Ukugoqa isilinganiso

Ukuguquguquka kodaka kunikeza udaka ngokukhubazeka okuhle, okulwenza lukwazi ukuzivumelanisa nokucindezeleka okukhiqizwa ukuncipha nokuguqulwa kwe-substrate, ngaleyo ndlela kuthuthukisa kakhulu amandla esibopho nokuqina kodaka.

Kusukela kumphumela wokuqukethwe kwe-cellulose ether esilinganisweni sokugoqa udaka (ff/fo), kungabonakala ukuthi ngokwanda kwe-cellulose ether C9101 kanye nokuqukethwe kwe-HPMC, isilinganiso sokugoqa udaka ngokuyisisekelo sibonise ukuthambekela okwandayo, okubonisa ukuthi ukuguquguquka kodaka kwakuyizimo ezicindezelayo. ngcono.

Lapho i-cellulose ether incibilika odakeni, ngoba i-methoxyl ne-hydroxypropoxyl ochungechungeni lwe-molecular izosabela nge-Ca2+ ne-Al3+ ku-slurry, ijeli ye-viscous iyakhiwa futhi igcwaliswe igebe lodaka lukasimende, ngaleyo ndlela Idlala indima yokugcwalisa okuguquguqukayo. kanye nokuqiniswa okuguquguqukayo, ukuthuthukisa ukubumbana kodaka, futhi kubonisa ukuthi ukuguquguquka kodaka oluguquliwe kuthuthukiswa kakhulu.

2.5 Amandla ebhondi

Kusukela kumthelela wokuqukethwe kwe-cellulose ether kumandla ebhondi yodaka, kungabonakala ukuthi amandla ebhondi yodaka ayanda ngokwanda kokuqukethwe kwe-cellulose ether.

Ukwengezwa kwe-cellulose ether kungenza ungqimba oluncane lwefilimu ye-polymer engangeni manzi phakathi kwe-cellulose ether kanye nezinhlayiya zikasimende ezinama-hydrated.Le filimu inomphumela wokuvala futhi ithuthukisa "ubuso obomile" bodaka.Ngenxa yokugcinwa kwamanzi okuhle kwe-cellulose ether, amanzi anele agcinwa ngaphakathi kodaka, ngaleyo ndlela kuqinisekiswe ukuqina kwe-hydration kasimende kanye nokuthuthukiswa okugcwele kwamandla awo, nokuthuthukisa amandla esibopho sokunamathisela usimende.Ngaphezu kwalokho, ukungezwa kwe-cellulose ether kuthuthukisa ukuhlangana kodaka, futhi kwenza udaka lube nepulasitiki enhle nokuguquguquka, okwenza udaka lukwazi ukuzivumelanisa nokuguqulwa kwe-shrinkage ye-substrate, ngaleyo ndlela kuthuthukise amandla esibopho sodaka. .

2.6 Ukuncipha

Ingabonakala emphumeleni wokuqukethwe kwe-cellulose ether ekuncipheni kodaka: (1) Inani lokushwabana lodaka lwe-cellulose ether liphansi kakhulu kunelo lodaka olungenalutho.(2) Ngokukhula kokuqukethwe kwe-C9101, inani lokuncipha kodaka lehla kancane kancane, kodwa lapho okuqukethwe kufinyelela ku-0.30%, inani lokuncipha kodaka lenyuka.Lokhu kungenxa yokuthi inani elikhulu le-cellulose ether, i-viscosity yayo enkulu, ebangela ukwanda kwesidingo samanzi.(3) Ngokukhula kokuqukethwe kwe-HPMC, inani lokuncipha kodaka lehla kancane kancane, kodwa lapho okuqukethwe kwalo kufinyelela ku-0.20%, inani lokuncipha kodaka lenyuka labe selincipha.Lokhu kungenxa yokuthi i-viscosity ye-HPMC inkulu kunaleyo ye-C9101.Ukuphakama kwe-viscosity ye-cellulose ether.Ukugcinwa kwamanzi kangcono, okuqukethwe komoya okwengeziwe, lapho okuqukethwe komoya kufinyelela ezingeni elithile, inani lokuncipha kodaka lizokhula.Ngakho-ke, ngokwenani le-shrinkage, umthamo ophelele we-C9101 ngu-0.05% ~ 0.20%.Umthamo omkhulu we-HPMC ngu-0.05%~0.10%.

3. Isiphetho

1. I-Cellulose ether ingathuthukisa ukugcinwa kwamanzi kodaka futhi inciphise ukuhambisana kodaka.Ukulungisa inani le-cellulose ether kungahlangabezana nezidingo zodaka olusetshenziswa kumaphrojekthi ahlukene.

2. Ukwengezwa kwe-cellulose ether kunciphisa amandla okuguquguquka namandla okucindezela odaka, kodwa kwandisa isilinganiso sokugoqa namandla okubopha ngezinga elithile, ngaleyo ndlela kuthuthukisa ukuqina kodaka.

3. Ukwengezwa kwe-cellulose ether kungathuthukisa ukusebenza kwe-shrinkage ye-mortar, futhi ngokwanda kokuqukethwe kwayo, inani lokunciphisa lodaka liba lincane futhi libe lincane.Kodwa lapho inani le-cellulose ether lifinyelela izinga elithile, inani lokuncipha kodaka likhuphuka ngezinga elithile ngenxa yokwanda kwenani lokungenisa umoya.