Cellulose ether on morphology ee ettringite hore

Saamaynta hydroxyethyl methyl cellulose ether iyo methyl cellulose ether ee qaab-dhismeedka ettringite ee dareeraha hore ee sibidhka ayaa lagu bartay iyadoo la baarayo microscopy elektarooniga ah (SEM). Natiijooyinka waxay muujinayaan in saamiga dhererka-dhexroor ee kiristaalo ettringite ee hydroxyethyl methyl cellulose ether ether modified slurry uu ka yar yahay in slurry caadiga ah, iyo qaab-dhismeedka ee crystals ettringite waa ul gaaban u eg. Dhererka-dhexroorka dhexroorka kiristaalo ettringite ee methyl cellulose ether slurry modified waa ka weyn yahay in slurry caadiga ah, iyo qaab-dhismeedka ee crystals ettringite waa irbad-ul. Kiristaalada ettringite ee ku jira dareeraha sibidhka ee caadiga ah waxay leeyihiin saami dhinac meel u dhexeeya. Marka loo eego daraasadda tijaabada ah ee kor ku xusan, waxaa si cad u cad in farqiga miisaanka kelli ee labada nooc ee ether-ka cellulose uu yahay qodobka ugu muhiimsan ee saameeya qaab-dhismeedka ettringite.

Erayada muhiimka ah:etringite; Dhererka dhexroorka dhererka; Methyl cellulose ether; Hydroxyethyl methyl cellulose ether; morphology

Ettringite, sida badeecada fuuq-baxa yar ee la ballaariyay, waxay saameyn weyn ku leedahay waxqabadka shubka sibidhka, waxayna had iyo jeer ahayd goobta cilmi-baarista ee walxaha ku salaysan sibidhka. Ettringite waa nooc ka mid ah trisulfide nooca calcium aluminate hydrate, formula kiimikaad waa [Ca3Al (OH) 6 · 12H2O] 2 · (SO4) 3 · 2H2O, ama waxaa loo qori karaa sida 3CaO · Al2O3 · 3CaSO4 · 32H2O, inta badan loo soo gaabiyo AFt. . Nidaamka sibidhka Portland, ettringite waxaa inta badan ka yimaada falcelinta gypsum ee leh aluminate ama ferric aluminate macdanta, taas oo ka ciyaarta doorka dib u dhigista fuuq-celinta iyo xoogga hore ee sibidhka. Sameynta iyo qaab-dhismeedka ettringite waxaa saameeya arrimo badan sida heerkulka, qiimaha pH iyo xoojinta ion. Horraantii 1976, Metha et al. loo adeegsaday iskaanka elektarooniga ah microscopy si ay u daraaseeyaan sifooyinka morphological ee AFt, oo la ogaaday in qaab-dhismeedka ee alaabta fuuqbaxa yar la ballaariyay uu ahaa wax yar ka duwan marka booska koritaanka uu ahaa mid ku filan iyo marka boosku xaddidan yahay. Midka hore wuxuu u badnaa cirbad-usha caato ah, halka kan dambena uu u badnaa birmad-usha gaagaaban. Cilmi-baarista Yang Wenyan waxay ogaatay in foomamka AFt ay ka duwan yihiin deegaan daaweyneed oo kala duwan. Deegaannada qoyan waxay dib u dhigi doonaan jiilka AFt ee shubka balaadhinta-doped waxayna kordhinayaan suurtagalnimada bararka shubka ah iyo dildilaaca. Deegaannada kala duwani waxay saameeyaan ma aha oo kaliya samaynta iyo qaab-dhismeedka AFt, laakiin sidoo kale xasilloonida mugga. Chen Huxing iyo al. waxay ogaatay in xasiloonida muddada dheer ee AFt ay hoos u dhacday korodhka nuxurka C3A. Clark iyo Monteiro iyo al. Waxaa la ogaaday in korodhka cadaadiska deegaanka, AFt qaab-dhismeedka crystal bedelay nidaam iyo khalkhal. Balonis iyo Glasser waxay dib u eegeen isbeddellada cufnaanta ee AFm iyo AFt. Renaudin iyo al. bartay isbeddellada qaabdhismeedka AFt ka hor iyo ka dib immersion ee xalka iyo xuduudaha qaabdhismeedka AFt ee Raman spectrum. Kunther iyo al. bartay saamaynta isdhexgalka ka dhexeeya CSH gel calcium-silicon ratio iyo sulfate ion on cadaadiska AFt crystallization by NMR. Isla mar ahaantaana, oo ku salaysan codsiga AFt ee alaabta cement-ku salaysan, Wenk et al. bartay AFt crystal orientation ee qaybta la taaban karo iyada oo loo marayo hard synchrotron shucaaca X-ray dhammayn tignoolajiyada diffraction. Samaynta AFt ee sibidhka isku dhafan iyo goobta cilmi-baarista ee ettringite ayaa la sahamiyay. Iyadoo lagu salaynayo falcelinta ettringite ee daahday, culimada qaarkood waxay sameeyeen cilmi-baaris badan oo ku saabsan sababta marxaladda AFt.

Balaadhinta mugga ee ay keento samaynta ettringite mararka qaarkood waa mid wanaagsan, waxayna u dhaqmi kartaa sidii "ballaarinta" oo la mid ah wakiilka ballaarinta oxide magnesium si loo ilaaliyo xasilloonida mugga alaabta sibidhka ku salaysan. Ku darida emulsion polymer iyo budada emulsion ee dib loo cusboonaysiin karo waxay bedeshaa sifooyinka macroscopic ee alaabta sibidhka ku salaysan sababtoo ah saameyntooda muhiimka ah ee qaab-dhismeedka yar yar ee walxaha ku salaysan sibidhka. Si kastaba ha ahaatee, si ka duwan budada emulsion ee dib loo cusboonaysiin karo oo inta badan kor u qaada hantida isku-xidhka ee hoobiye adag, ether-ka polymer cellulose ether-ka-milmi kara (CE) waxay siinaysaa hoobiye cusub oo isku qasan biyo haynta wanaagsan iyo saamaynta dhumucdiisuna, si kor loogu qaado waxqabadka shaqada. Aan-ionic CE caadi ahaan loo isticmaalo, oo ay ku jiraan methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC),Hydroxyethyl methyl cellulose (HEMC)iwm, iyo CE waxay door ku leedahay hoobiye cusub oo la isku daray laakiin sidoo kale waxay saameeyaan habka fuuq-celinta ee dareeraha sibidhka. Daraasaduhu waxay muujiyeen in HEMC ay beddesho qaddarka AFt ee la soo saaro sida badeecada fuuq-celinta. Si kastaba ha noqotee, ma jiraan daraasado si nidaamsan u barbardhigay saameynta CE ee qaab-dhismeedka microscopic ee AFt, sidaa darteed warqadani waxay sahamisaa farqiga u dhexeeya saameynta HEMC iyo MC ee qaab-dhismeedka microscopic ee ettringham horaantii (1-maalin) sibidhka sibidhka iyada oo loo marayo falanqaynta sawirka iyo isbarbardhigga.

1. Tijaabi

1.1 Qalabka Ceyriinka ah

P·II 52.5R Portland cement ay soo saartay Anhui Conch Cement Co., LTD waxaa loo doortay sidii sibidhka tijaabada. Labada ethers cellulose waa hydroxyethyl methylcellulose (HEMC) iyo methylcellulose (methylcellulose, Shanghai Sinopath Group) siday u kala horreeyaan. MC); Biyaha isku dhafan waa biyaha qasabadda.

1.2 Hababka tijaabada ah

Saamiga biyaha-sibidhka ee muunadda koollada sibidhka waxa ay ahayd 0.4 (saamiga tirada biyaha iyo sibidhka), waxa ku jira eter-ka cellulose waxa uu ahaa 1% tirada sibidhka. Diyaarinta muunada waxaa la fuliyay si waafaqsan GB1346-2011 "Habka Tijaabinta Isticmaalka Biyaha, Dejinta Waqtiga iyo Dejinta Joogtada Heerka Sibidhka". Samaynta muunada ka dib, filim caag ah ayaa lagu duubay dusha sare ee caaryada si looga hortago uumiga biyaha oogada iyo kaarboonaysiinta ) %. 1 maalin ka bacdi, caaryada ayaa laga soo saaray, shaybaarkiina waa la jabiyay, kadibna waxaa laga soo qaaday muunad yar oo dhexda ah, waxaana lagu qooyay ethanol anhydrous si ay u baabi'iso fuuq-baxa, ka dibna muunadda ayaa la soo saaray oo la qalajiyey ka hor inta aan la tijaabin. Muunada la qalajiyey ayaa lagu dhejiyay miiska saamiga oo leh koollo laba-geesood leh, iyo lakabka filimka dahabka ah ayaa lagu buufiyay dusha sare ee Cressington 108auto auto ion sputtering. Xakamaynta hadda jirta waxay ahayd 20 mA wakhtiga wax-soo-saarka wuxuu ahaa 60 s. FEI QUANTAFEG 650 mikroskoob ee elektarooniga ah ee deegaanka (ESEM) ayaa loo isticmaalay in lagu ilaaliyo astaamaha morphological ee AFt ee qaybta muunada. Habka elektaroonigga sare ee faakuumka sare ayaa loo isticmaalay si loo ilaaliyo AFT. Korantada dardargelintu waxa ay ahayd 15kV, dhexroorka barta barxadu waxa uu ahaa 3.0 nm, masaafada shaqadana waxa la xakameeyay ilaa 10 mm.

2. Natiijooyinka iyo doodaha

Sawirada SEM ee ettringite ee ku jira dareeraha sibidhka ee HEMC-la beddelay ayaa muujiyay in kobaca jihada ee lakabka Ca (OH) 2 (CH) uu ahaa mid cad, iyo AFt waxay muujisay ururin aan joogto ahayn ee usha gaaban-sida AFt, iyo qaar gaaban oo u eg AFT ayaa la daboolay. oo leh qaab dhismeedka xuubka HEMC. Zhang Dongfang iyo al. Waxa kale oo la helay ul gaaban oo u eg AFt marka la eegayo isbeddelada qaab-dhismeedka yar yar ee HEMC wax ka beddelka dareeraha sibidhka iyada oo loo marayo ESEM. Waxay rumaysnaayeen in dareeraha sibidhka ee caadiga ah uu si dhakhso ah uga falceliyay ka dib markii ay la kulmeen biyaha, sidaas darteed AFt crystal ayaa ahaa caato, iyo kordhinta da'da fuuqbaxa waxay keentay korodhka joogtada ah ee saamiga dhererka-dhexroorka. Si kastaba ha noqotee, HEMC waxay kordhisay viscosity ee xalka, waxay yaraysay heerka xidhitaanka ions ee xalka waxayna dib u dhigtay imaatinka biyaha dusha sare ee qaybaha clinker, sidaas darteed saamiga dhererka-dhexroorka ee AFt wuxuu kordhay isbeddel daciif ah iyo sifooyinka muuqaalkiisa ayaa muujiyay. ul gaaban oo qaab u eg. Marka la barbar dhigo AFt ee dareeraha sibidhka ee caadiga ah ee isla da'da ah, aragtidan qayb ahaan waa la xaqiijiyay, laakiin ma khusayso in lagu sharaxo isbeddellada qaabdhismeedka AFt ee MC wax ka beddelka dareeraha sibidhka. Sawirada SEM ee ettridite ee 1-maalin qallafsan ee MC ee wax laga beddelay dareeraha sibidhka ayaa sidoo kale muujiyay kobaca jihada ee lakabka Ca (OH) 2, qaar ka mid ah sagxadaha AFt ayaa sidoo kale lagu daboolay qaab dhismeedka filimka MC, iyo AFt waxay muujisay sifooyinka qaab-dhismeedka kobaca kooxda. Si kastaba ha ahaatee, marka la barbardhigo, AFt crystal in MC wax ka beddelka dareeraha sibidhka ayaa leh saamiga dhererka-dhexroorka ka weyn iyo qaab-muuqaal caato ah, oo muujinaya qaab-dhismeed caadi ah.

HEMC iyo MC labaduba waxay daahiyeen geeddi-socodkii hore ee fuuq-celinta sibidhka waxayna kordhiyeen viscosity ee xalka, laakiin kala duwanaanshaha astaamaha AFt morphological ee ay sababeen wali waa muhiim. Dhacdooyinka kor ku xusan waxaa lagu sii faahfaahin karaa aragtida qaabdhismeedka molecular ee ether cellulose iyo qaabdhismeedka crystal AFt. Renaudin iyo al. Ku qooyay AFt-ka isku-dhafan ee xalalka alkali ah ee la diyaariyey si uu u helo "AFt qoyan", qayb ahaanna ka saaray oo ku engejiyey dusha sare ee CaCl2 oo buuxa (35% qoyaan qaraabo ah) si loo helo "AFt engegan". Ka dib markii daraasadda dib-u-habaynta qaab-dhismeedka ee Raman spectroscopy iyo raajada budada raajada, waxaa la ogaaday in aysan jirin wax farqi ah oo u dhexeeya labada qaab-dhismeed, kaliya jihada samaynta crystal ee unugyada ayaa isbeddelay habka qalajinta, taas oo ah, habka deegaanka. isbeddelka "qoyan" ilaa "qallalan", AFt crystals waxay sameeyeen unugyo u socda jihada caadiga ah ee si tartiib tartiib ah u kordhay. Kiristaalo AFt ee ku teedsan jihada caadiga ah c waxay noqdeen kuwo sii yaraanaya. Unugga ugu aasaasiga ah ee booska saddex-geesoodka ah wuxuu ka kooban yahay xariiq caadi ah, b khad caadi ah iyo xariiq caadi ah oo midba midka kale ku taagan yahay. Xaaladda b caadiga ah ayaa go'an, AFt crystals ayaa isku urursaday si caadi ah, taasoo keentay in qaybta unugyada oo weyn ee diyaaradda ab caadiga ah. Sidaa darteed, haddii HEMC ay "kaydiso" biyo ka badan MC, jawi "qalalan" ayaa ku dhici kara aag degaanka ah, dhiirigelinta isugeynta lateral iyo koritaanka kiristaalo AFt. Patural iyo al. Waxaa la ogaaday in CE lafteeda, ay sare u kacdo heerka polymerization (ama ka weyn yahay miisaanka kelli), uu weynaanayo viscosity ee CE iyo ka wanaagsan yahay waxqabadka xajinta biyaha. Qaab dhismeedka molecular ee HEMCs iyo MCS waxay taageertaa mala-awaalkan, iyadoo kooxda hydroxyethyl ay leeyihiin miisaan unugyo ah oo aad uga weyn kooxda hydrogen.

Guud ahaan, kiristaalo AFt ayaa samaysan doona oo soo da'i doona kaliya marka ion ay khusayso ay gaadhaan saturation gaar ah nidaamka xalka. Sidaa darteed, arrimo ay ka mid yihiin xoojinta ion, heerkulka, qiimaha pH iyo booska formation ee xalka falcelinta waxay si weyn u saameyn kartaa qaab-dhismeedka AFt crystals, iyo isbeddelada xaaladaha isku-dhafka macmalka ah waxay bedeli karaan qaab-dhismeedka AFt crystals. Sidaa darteed, saamiga kiristaalo AFt ee slurry sibidhka caadiga ah ee u dhexeeya labada waxaa laga yaabaa inay sababto hal arrin ee isticmaalka biyaha ee fuuq-celinta hore ee sibidhka. Si kastaba ha ahaatee, farqiga u dhexeeya AFt crystal morphology ee ay sababaan HEMC iyo MC waa in ay inta badan sabab u tahay habka ilaalinta gaarka ah ee biyaha. Hemcs iyo MCS waxay abuuraan "loop xiran" oo gaadiidka biyaha gudahooda microzone ee qulqulka sibidhka cusub, taasoo u oggolaanaysa "muddo gaaban" kaas oo biyuhu "fudud tahay in la galo oo ay adagtahay in laga baxo." Si kastaba ha ahaatee, inta lagu jiro muddadan, deegaanka wajiga dareeraha ah ee ku yaal iyo meel u dhow microzone sidoo kale waa la bedelay. Waxyaabaha ay ka midka yihiin xoojinta ion, pH, iwm., Isbeddelka jawiga koritaanka ayaa si dheeraad ah uga muuqda sifooyinka morphological ee kiristaalo AFt. Tani "loop xiran" ee gaadiidka biyuhu waxay la mid tahay habka ficilka ee lagu qeexay Pourchez et al. HPMC oo door ka qaadanaysa haynta biyaha.

3. Gabagabo

(1) Ku darida hydroxyethyl methyl cellulose ether (HEMC) iyo methyl cellulose ether (MC) waxay si weyn u bedeli karaan qaab-dhismeedka ettringite horaantii (1 maalin) dareeraha sibidhka caadiga ah.

(2) Dhererka iyo dhexroorka kristal ettringite ee HEMC ee dareeraha sibidhka ee wax laga beddelay waa qaab ul yar iyo gaaban; Dhererka iyo dhexroorka saamiga kiristaalo ettringite ee ku jira slurry sibidhka wax laga beddelay waa weyn yahay, kaas oo ah qaab irbad-ul Kiristaalada ettringite ee ku jira dareeraha sibidhka ee caadiga ah waxay leeyihiin saamiga u dhexeeya labadan.

(3) Saamaynta kala duwan ee laba ethers cellulose ah oo ku saabsan morphology of ettringite asal ahaan waxaa sabab u ah kala duwanaanshaha miisaanka kelli.