Cellulose ether pesvedzero pakuchengetedza mvura

Iyo yezvakatipoteredza simulation nzira yakashandiswa kudzidza mhedzisiro ye cellulose ethers ine madhigirii akasiyana ekutsiva uye molar substitution pane kuchengetwa kwemvura kwedhaka pasi pemamiriro ekupisa. Ongororo yemhedzisiro yebvunzo uchishandisa manhamba maturusi inoratidza kuti hydroxyethyl methyl cellulose ether ine yakaderera substitution dhigirii uye yakakwira molar substitution degree inoratidza kuchengetwa kwemvura kwakanakisa mudhaka.

Mazwi akakosha: cellulose ether: kuchengetedza mvura; mortar; nharaunda simulation nzira; kupisa mamiriro

Nekuda kwemabhenefiti ayo mukutonga kwemhando, kuve nyore kwekushandisa uye chekufambisa, uye kuchengetedza kwezvakatipoteredza, yakaoma-yakasanganiswa dhaka parizvino iri kuwedzera uye zvakanyanya kushandiswa mukuvaka kuvaka. Dry-mixed mortar inoshandiswa mushure mekuwedzera mvura uye kusanganisa panzvimbo yekuvaka. Mvura ine mabasa maviri makuru: rimwe nderekuona mashandiro ekuvaka kwedhaka, uye rimwe ndere kuona hydration yesimende zvinhu kuitira kuti dhaka riwane zvinodikanwa zvemuviri uye zvemichina mushure mekuoma. Kubva pakupedzwa kwekuwedzera mvura mudhaka kusvika pakupedzwa kwekuvaka kusvika pakuwana zvakakwana zvemuviri uye zvemagetsi zvivakwa, mvura yemahara inosimuka inofamba munzira mbiri kunze kwekuisira simende: base layer absorption uye pamusoro evaporation. Mumamiriro ekupisa kana muzuva rakananga, unyoro hunoputika nekukurumidza kubva pamusoro. Mumamiriro ekupisa kana pasi pezuva rakananga, zvakakosha kuti dhaka richengetedze unyoro nekukurumidza kubva pamusoro uye rinoderedza kurasikirwa kwayo kwemahara kwemvura. Kiyi yekuongorora kuchengetwa kwemvura yedhaka kuona nzira yekuyedza yakakodzera. Li Wei et al. akadzidza nzira yekuyedza yekuchengeta mvura yedhaka ndokuona kuti kana ichienzaniswa nevacuum filtration nzira uye yekusefa bepa nzira, iyo yemamiriro ekunze simulation nzira inogona kunyatso ratidza kuchengetwa kwemvura kwedhaka pane dzakasiyana tembiricha.

Cellulose ether ndiyo inonyanya kushandiswa kuchengetedza mvura muzvigadzirwa zvedhaka dzakaoma-musanganiswa. Anonyanya kushandiswa seruseruse ether mudhaka yakaoma-yakasanganiswa ihydroxyethyl methyl cellulose ether (HEMC) uye hydroxypropyl methyl cellulose ether (HPMC). Mapoka anopindirana anotsiva ndiwo hydroxyethyl, methyl uye hydroxypropyl, methyl. Chiyero chekutsiva (DS) che cellulose ether chinoratidza dhigirii iro boka rehydroxyl pane imwe neimwe anhydroglucose unit rinotsiviwa, uye dhigirii remolar substitution (MS) rinoratidza kuti kana boka rinotsiva rine boka re hydroxyl, iyo inotsiva inoenderera ichienderera mberi. ita etherification reaction kubva kuboka remahara rehydroxyl. degree. Chimiro chemakemikari uye dhigirii rekutsiva cellulose ether zvinhu zvakakosha zvinokanganisa kutakurwa kwemwando mudhaka uye microstructure yedhaka. Kuwedzera kwema molecular uremu we cellulose ether kuchawedzera kuchengetwa kwemvura kwedhaka, uye dhigirii rakasiyana rekutsiva richakanganisawo kuchengetwa kwemvura kwedhaka.

Zvinhu zvikuru zvenzvimbo yakaoma-yakasanganiswa yekuvaka dhaka zvinosanganisira ambient tembiricha, hunyoro hunoenderana, kumhanya kwemhepo uye kunaya kwemvura. Panyaya yemamiriro ekunze anopisa, ACI (American Concrete Institute) Committee 305 inoitsanangura semusanganiswa wezvinhu zvakaita setembiricha yepamusoro yemhepo, hunyoro hushoma, uye kumhanya kwemhepo, izvo zvinokanganisa kunaka kana kuita kwekongiri nyowani kana yakaoma yerudzi urwu rwemamiriro ekunze. Zhizha munyika yangu inowanzova mwaka wepamusoro wekuvaka kwezvirongwa zvakasiyana-siyana zvekuvaka. Kuvaka mumamiriro ekunze anopisa ane tembiricha uye kunyorova kwakadzika, kunyanya chikamu chedhaka kuseri kwemadziro chinogona kuratidzwa kune chiedza chezuva, izvo zvinokanganisa kusanganiswa kutsva uye kuoma kwevhu rakaoma-yakasanganiswa dhaka. Migumisiro inokosha pakushanda yakadai sekuderedza kushanda, kupera simba uye kupera simba. Maitiro ekuona mhando yedhaka yakaoma-yakasanganiswa mukuvaka kwemamiriro ekunze anopisa yakwezva kutarisa uye kutsvagisa kwevashandi veindasitiri yematope uye vashandi vekuvaka.

Mupepa rino, nzira yekuenzanisa yezvakatipoteredza inoshandiswa kuongorora kuchengetwa kwemvura yedhaka yakasanganiswa nehydroxyethyl methyl cellulose ether uye hydroxypropyl methyl cellulose ether ine madhigirii akasiyana ekutsiva uye molar substitution pa45.℃, uye software yenhamba inoshandiswa JMP8.02 inoongorora data rekuyedza kuti ridzidze kurudziro yeeserulosi ether dzakasiyana pakuchengetedza mvura kwedhaka pasi pemamiriro ekupisa.

1. Raw zvinhu uye nzira dzekuyedza

1.1 Raw zvinhu

Conch P. 042.5 Cement, 50-100 mesh quartz jecha, hydroxyethyl methylcellulose ether (HEMC) uye hydroxypropyl methylcellulose ether (HPMC) ine viscosity ye40000mPa·s. Kuti udzivise pesvedzero yezvimwe zvikamu, bvunzo inotora yakapfava dhaka formula, kusanganisira 30% simende, 0.2% cellulose ether, uye 69.8% quartz jecha, uye huwandu hwemvura hwakawedzerwa i19% yehuwandu hwedhaka formula. Ose ari maviri mareshiyo.

1.2 Nzira yekufananidza kwezvakatipoteredza

Iyo yekuyedza mudziyo weyezvakatipoteredza simulation nzira inoshandisa iodine-tungsten mwenje, mafeni, uye makamuri ezvakatipoteredza kutevedzera tembiricha yekunze, hunyoro, uye kumhanya kwemhepo, nezvimwe, kuyedza mutsauko wemhando yedhaka richangobva kusanganiswa pasi pemamiriro akasiyana, uye edza kuchengetwa kwemvura kwedhaka. Mukuedza uku, nzira yekuedza mumabhuku yakagadziridzwa, uye komputa yakabatana nechiyero chekurekodha otomatiki uye kuyedzwa, nekudaro ichidzikisa chikanganiso chekuyedza.

Muedzo wakaitwa murabhoritari yakajairwa [tembiricha (23±2)°C, hunyoro hunoenderana (50±3)%] uchishandisa chigadziko chisinganyure (ndiro yepurasitiki ine dhayamita yemukati ye88mm) patembiricha yeradiation ye45.°C. Nzira yekuedza ndeyotevera:

(1) Ne fan yakadzimwa, batidza mwenje weiodine-tungsten, uye isa ndiro yepurasitiki munzvimbo yakagadzikana yakadzika pasi peiodine-tungsten mwenje kuti utange kupisa kwe 1 h;

(2) Yeresa ndiro yepurasitiki, woisa dhaka rakakangwa mundiro yepurasitiki, uitsvedze maererano nehupamhi hunodiwa, uye wozoiyera;

(3) Dzorera ndiro yepurasitiki panzvimbo yayo yepakutanga, uye software inodzora chiyero kuti ingoyera kamwe chete maminitsi mashanu, uye muedzo unopera mushure meawa imwe.

2. Migumisiro uye nhaurirano

Kuverengera mhedzisiro yechiyero chekuchengetedza mvura R0 yedhaka yakasanganiswa neyakasiyana cellulose ethers mushure mekuvhenekera pa45.°C kwemaminitsi makumi matatu.

Iri pamusoro bvunzo data rakaongororwa pachishandiswa chigadzirwa JMP8.02 chenhamba software boka SAS Kambani, kuitira kuti iwane yakavimbika ongororo mhinduro. Nzira yekuongorora ndeyotevera.

2.1 Kudzokororwa kuongororwa uye kukodzera

Kuisa modhi kwaiitwa neakaenzana masikweya. Kuenzanisa pakati pemutengo wakayerwa uye kukosha kwakafanotaurwa kunoratidza kuongororwa kweiyo modhi yakakodzera, uye inonyatso kuratidzwa nemifananidzo. Iwo maviri ma dashed curves anomiririra "95% nguva yekuvimba", uye dashed yakachinjika mutsara inomiririra kukosha kweavhareji yedata rese. The dashed curve uye Mharadzano yemitsara yakatsetseka yakatsetseka inoratidza kuti modhi yepseudo-nhanho ndiyo yakajairika.

Hunhu chaihwo hwekukodzera pfupiso uye ANOVA. Muchidimbu chakakodzera, iyo R² yakasvika 97%, uye kukosha kweP mukuongorora kwakasiyana kwaive kwakaderera pane 0.05. Iko kusanganiswa kwemamiriro maviri aya kunoratidza zvakare kuti iyo modhi yakakodzera yakakosha.

2.2 Ongororo yeZvinhu Zvinokurudzira

Mukati mechikamu chekuedza uku, pasi pemamiriro emaminitsi makumi matatu ekuvhenekerwa, maitiro akakodzera ekugadzirisa zvinhu ndeaya anotevera: maererano nechinhu chimwe chete, p values ​​inowanikwa nemhando ye cellulose ether uye molar substitution degree ese ari pasi pe0.05 , iyo inoratidza kuti yechipiri Iyo yekupedzisira ine simba guru pakuchengetwa kwemvura yedhaka. Nezvekudyidzana kuri kuita, kubva pamhedzisiro yekuyedza yeakakodzera kuongororwa mhedzisiro yekukanganisa kwerudzi rwe cellulose ether, dhigirii rekutsiva (Ds) uye dhigirii remolar substitution (MS) pakuchengetedza mvura kwedhaka, rudzi rwe cellulose ether uye dhigirii rekutsinhanisa, Kudyidzana pakati pedhigirii rekutsinhanisa uye dhigirii yemolar yekutsiva ine mhedzisiro yakakosha pakuchengetwa kwemvura kwedhaka, nekuti p-values ​​yezvose zviri pasi pe0.05. Kudyidzana kwezvinhu kunoratidza kuti kupindirana kwezvinhu zviviri kunonyanya kutsanangurwa intuitively. Muchinjikwa unoratidza kuti izvo zviviri zvine hukama hwakasimba, uye kufanana kunoratidza kuti izvo zviviri zvine hukama husina kusimba. Mufactoral interaction diagram, tora nzvimboα apo rudzi rwakamira uye lateral substitution dhigirii zvinopindirana semuenzaniso, zvikamu zviviri zvemitsara zvinopindirana, zvichiratidza kuti kuwirirana pakati pemhando uye dhigirii yekutsiva kwakasimba, uye munzvimbo b apo rudzi rwakamira uye molar lateral substitution degree. interact , zvikamu zviviri zvemitsara zvinowanzoenderana, zvichiratidza kuti kuwirirana pakati pemhando nemolar kutsiva hakuna simba.

2.3 Kufanotaura nezvekuchengetedza mvura

Zvichienderana nemuenzaniso wakakodzera, maererano nekupesvedzera kwakazara kweakasiyana cellulose ethers pakuchengetedza mvura kwedhaka, kuchengetwa kwemvura kwedhaka kunofanotaurwa neJMP software, uye musanganiswa weparameter yekuchengetera mvura zvakanaka kwedhaka inowanikwa. Kufanotaura kwekuchengetedza mvura kunoratidza kusanganiswa kwemvura yakanakisa yekuchengetedza mvura uye maitiro ekusimudzira, ndiko kuti, HEMC iri nani pane HPMC mukuenzanisa kwemhando, kutsiva kwepakati nepakati kuri nani pane kutsiviwa kwepamusoro, uye kutsiva kwepakati nepamusoro kuri nani pane kutsiva kwakaderera. mumolar substitution, asi Hapana mutsauko wakakura pakati pezviviri zviri mumubatanidzwa uyu. Muchidimbu, hydroxyethyl methyl cellulose ethers ine yakaderera substitution degree uye yakakwira molar substitution degree yakaratidza yakanakisa dhaka kuchengetedza mvura pa45.℃. Pasi pemusanganiswa uyu, kukosha kwakafanotaurwa kwekuchengetwa kwemvura kwakapihwa nehurongwa ndeye 0.611736±0.014244.

3. Mhedziso

(1) Sechinhu chimwe chete chakakosha, rudzi rwe cellulose ether ine simba guru pakuchengetedza mvura kwedhaka, uye hydroxyethyl methyl cellulose ether (HEMC) iri nani pane hydroxypropyl methyl cellulose ether (HPMC). Zvinoratidza kuti mutsauko murudzi rwekutsiviwa uchatungamirira kumusiyano mukuchengetedza mvura. Panguva imwecheteyo, rudzi rwe cellulose ether inopindiranawo nehuwandu hwekutsiva.

(2) Sechimwe chinhu chakakosha chinokonzera chinhu, iyo molar substitution degree ye cellulose ether inodzikira, uye kuchengetwa kwemvura kwedhaka kunowanzodzikira. Izvi zvinoratidza kuti sezvo cheni yeparutivi ye cellulose ether substituent boka ichiramba ichiitwa etherification reaction neiyo yemahara hydroxyl boka, zvinozotungamira kune mutsauko mukuchengetwa kwemvura kwedhaka.

(3) Chiyero chekutsiviwa kwe cellulose ether yakabatana nemhando uye molar degree yekutsiva. Pakati pedhigirii yekutsinhanisa uye rudzi, munyaya yedhigirii yakaderera yekutsinhanisa, kuchengetwa kwemvura yeHEMC kuri nani pane yeHPMC; muchiitiko chepamusoro chekugadzirisa, musiyano pakati peHEMC neHPMC hausi mukuru. Nekuda kwekudyidzana pakati pedhigirii rekutsinhanisa uye molar kutsiva, mune yakaderera dhigirii yekutsiviwa, kuchengetwa kwemvura kweyakaderera molar degree yekutsiva kuri nani pane iyo yakakwirira molar degree yekutsiva; Musiyano hausi mukuru.

(4) Iyo dhaka yakasanganiswa nehydroxyethyl methyl cellulose ether ine yakaderera substitution degree uye yakakwirira molar substitution degree yakaratidza yakanakisa kuchengetedza mvura pasi pemamiriro ekupisa. Zvisinei, matsanangurirwo akaitwa cellulose ether mhando, dhigirii rekutsiva uye dhigirii remolar rekutsiva pane kuchengetwa kwemvura kwedhaka, iyo mechanistic nyaya mune iyi ichiri kuda kumwe kudzidza.