Cellulose ether kuri morphologie ya ettringite kare

Ingaruka za hydroxyethyl methyl selulose ether na methyl selulose ether kuri morphologie ya ettringite mugitereko cya sima hakiri kare byakozwe na scanning electron microscopie (SEM). Ibisubizo byerekana ko uburebure bwa diametre ya kirisiti ya ettringite muri hydroxyethyl methyl selulose ether yahinduwe slurry ni ntoya kuruta iyisanzwe, kandi morphologie ya kristu ya ettringite ni ngufi-isa. Ikigereranyo cy'uburebure bwa diametre ya kristu ya ettringite muri methyl selulose ether yahinduwe slurry nini kuruta iyo mubisanzwe, kandi morphologie ya kristu ya ettringite ni inshinge-inkoni. Crystal ya ettringite mubisanzwe sima ya sima ifite igipimo cya aspect ahantu hagati. Binyuze mu bushakashatsi bwakozwe hejuru, biragaragara neza ko itandukaniro ryuburemere bwa molekuline yubwoko bubiri bwa selile ether aricyo kintu cyingenzi kigira ingaruka kuri morphologie ya ettringite.

Amagambo y'ingenzi:ettringite; Ikigereranyo cy'uburebure-diameter; Methyl selulose ether; Hydroxyethyl methyl selulose ether; morphologie

Ettringite, nkibicuruzwa byagutse byoroheje, bigira ingaruka zikomeye kumikorere ya beto ya sima, kandi yamye ari ahantu h'ubushakashatsi bwibikoresho bishingiye kuri sima. Ettringite ni ubwoko bwa trisulfide ya calcium aluminate hydrate, formulaire yimiti ni [Ca3Al (OH) 6 · 12H2O] 2 · (SO4) 3 · 2H2O, cyangwa irashobora kwandikwa nka 3CaO · Al2O3 · 3CaSO4 · 32H2O, bikunze kuvugwa muri AFt . Muri sisitemu ya sima ya Portland, ettringite ikorwa ahanini nigikorwa cya gypsumu hamwe namabuye ya alumine cyangwa ferric aluminate, bigira uruhare mukudindiza hydrata nimbaraga za sima hakiri kare. Imiterere na morphologie ya ettringite bigira ingaruka kubintu byinshi nkubushyuhe, agaciro ka pH hamwe nubunini bwa ion. Nko mu 1976, Metha n'abandi. yakoresheje scanning electron microscopi kugirango yige imiterere ya morfologiya ya AFt, asanga morphologie yibyo bicuruzwa byagutse byoroheje byari bitandukanye gato mugihe umwanya wo gukura wari munini bihagije kandi mugihe umwanya wari muto. Iyambere yari igizwe ninshinge zoroheje zifata inshinge, mugihe iyanyuma yari prism ngufi. Ubushakashatsi bwa Yang Wenyan bwerekanye ko imiterere ya AFt itandukanye n’ibidukikije bitandukanye byo gukiza. Ibidukikije bitose byadindiza ibisekuruza bya AFt mugukwirakwiza beto kandi bikongerera amahirwe yo kubyimba no guturika. Ibidukikije bitandukanye ntabwo bigira ingaruka kumiterere na microstructure ya AFt gusa, ahubwo binagira ingaruka kumajwi. Chen Huxing n'abandi. wasanze ituze rirambye rya AFt ryagabanutse hamwe no kwiyongera kwa C3A. Clark na Monteiro n'abandi. yasanze hamwe no kwiyongera k'umuvuduko w'ibidukikije, AFt kristaliste yahindutse kuva kuri gahunda ihinduka akajagari. Balonis na Glasser basuzumye impinduka zubucucike bwa AFm na AFt. Renaudin n'abandi. yize impinduka zimiterere ya AFt mbere na nyuma yo kwibizwa mubisubizo hamwe nuburyo bwa AFt muburyo bwa Raman. Kunther n'abandi. yize ku ngaruka zimikoranire hagati ya CSH gel calcium-silicon igereranya na sulfate ion kumuvuduko wa kristu ya AFt na NMR. Muri icyo gihe, ushingiye ku ikoreshwa rya AFt mu bikoresho bishingiye kuri sima, Wenk n'abandi. yize AFt kristal yerekanwe igice gifatika binyuze mumirasire ikomeye ya synchrotron X-ray itandukanya tekinoroji. Hakozwe ubushakashatsi bwa AFt muri sima ivanze hamwe nubushakashatsi bwa ettringite. Ukurikije reaction yatinze ya ettringite, intiti zimwe zakoze ubushakashatsi bwinshi kubitera icyiciro cya AFt.

Kwiyongera kwijwi ryatewe no gushiraho ettringite rimwe na rimwe biba byiza, kandi birashobora gukora nka "kwaguka" bisa na magnesium oxyde yo kwagura kugirango igumane ubwinshi bwibikoresho bishingiye kuri sima. Kwiyongera kwa polymer emuliyoni hamwe nifu ya emulsion yisubiramo ihindura imiterere ya macroscopique yibikoresho bishingiye kuri sima kubera ingaruka zikomeye kuri microstructure yibikoresho bishingiye kuri sima. Ariko, bitandukanye nifu ya emulsion isubirwamo cyane cyane izamura imitungo ya minisiteri ikomye, amazi ya elegitoronike ya polymer selulose ether (CE) itanga amavuta mashya avanze neza kandi akagira umubyimba, bityo bigatuma imikorere ikora. CE itari iyoni ikoreshwa cyane, harimo methyl selulose (MC), hydroxyethyl selulose (HEC), hydroxypropyl methyl selulose (HPMC),hydroxyethyl methyl selulose (HEMC), nibindi, na CE igira uruhare mumashanyarazi mashya avanze ariko ikanagira ingaruka kumikorere ya sima ya sima. Ubushakashatsi bwerekanye ko HEMC ihindura ingano ya AFt yakozwe nkibicuruzwa bitanga amazi. Nyamara, nta bushakashatsi bwigeze bugereranya ingaruka za CE kuri microscopique morphologie ya AFt, iyi nyandiko rero iragaragaza itandukaniro ryingaruka za HEMC na MC kuri microscopique morphologie ya ettringham mugitangira (umunsi wumunsi 1) ukoresheje isesengura ryamashusho kandi kugereranya.

1. Ubushakashatsi

1.1 Ibikoresho bito

P · II 52.5R Isima ya Portland yakozwe na Anhui Conch Cement Co, LTD yatoranijwe nka sima mubushakashatsi. Ethers ebyiri za selile ni hydroxyethyl methylcellulose (HEMC) na methylcellulose (methylcellulose, Shanghai Sinopath Group). MC); Amazi avanze ni amazi ya robine.

1.2 Uburyo bw'igerageza

Ikigereranyo cy’amazi-sima yikigereranyo cya sima cyari 0.4 (igipimo cyinshi cyamazi na sima), naho eterulose ya selile yari 1% yuburemere bwa sima. Gutegura ingero byakozwe hakurikijwe GB1346-2011 “Uburyo bwo Kugerageza Gukoresha Amazi, Gushiraho Igihe no Guhagarara kwa Cement Standard Consistency”. Nyuma yo gukora icyitegererezo, firime ya pulasitike yashyizwe hejuru yububumbyi kugirango hirindwe ko amazi y’amazi aturuka hamwe na karuboni, hanyuma urugero rushyirwa mu cyumba gikiza gifite ubushyuhe bwa (20 ± 2) ℃ n’ubushuhe bugereranije bwa (60 ± 5) )%. Nyuma yumunsi 1, ifu yakuweho, hanyuma ingero ziravunika, hanyuma hafatwa urugero ruto hagati hanyuma rushyirwa muri etanol ya anhydrous kugirango irangize amazi, hanyuma icyitegererezo kirasohoka kiruma mbere yo kwipimisha. Ingero zumye zometse ku meza y'icyitegererezo hamwe n'amashanyarazi yometse ku mpande ebyiri, kandi igice cya firime ya zahabu cyatewe hejuru ku gikoresho cya Cressington 108auto cyikora. Umuyaga wo gusohora wari mA 20 naho igihe cyo gusohora cyari 60 s. FEI QUANTAFEG 650 Ibidukikije Scanning electron Microscope (ESEM) yakoreshejwe kugirango harebwe imiterere ya morfologiya ya AFt ku gice cyicyitegererezo. Uburyo bwa vacuum bwa kabiri bwa electron bwakoreshejwe mukureba AFT. Umuvuduko wihuta wari 15 kV, umurambararo wumurambararo wa 3.0 nm, naho intera yakazi yagenzuwe kuri mm 10.

2. Ibisubizo n'ibiganiro

SEM amashusho ya ettringite muburyo bukomeye bwa HEMC yahinduwe na sima yerekanaga ko gukura kwicyerekezo cya Ca (OH) 2 (CH) byagaragaye, kandi AFt yerekanaga kwirundanya bidasanzwe byinkoni ngufi nka AFt, kandi hari AFT yari ifite inkoni ngufi. hamwe na HEMC membrane imiterere. Zhang Dongfang n'abandi. wasanze kandi inkoni ngufi isa na AFt mugihe witegereje impinduka za microstructure ya HEMC yahinduye sima ibinyujije muri ESEM. Bizeraga ko isima isanzwe ya sima yakiriye vuba nyuma yo guhura n’amazi, bityo kristu ya AFt yari yoroshye, kandi kwagura imyaka y’amazi byatumye kwiyongera kwinshi kwa diameter. Nyamara, HEMC yongereye ubwiza bwigisubizo, igabanya igipimo cyo guhuza ion mu gisubizo kandi itinda kugera ku mazi hejuru y’ibice bya clinker, bityo igipimo cy’uburebure bwa diameter ya AFt cyiyongereye mu ntege nke kandi imiterere yacyo ya morfologiya yerekanaga imiterere ngufi imeze. Ugereranije na AFt muburyo busanzwe bwa sima yo mu kigero kimwe, iyi nyigisho yagenzuwe igice, ariko ntabwo ikoreshwa mugusobanura impinduka zijyanye na morfologiya ya AFt muri MC yahinduwe na sima. SEM amashusho ya ettridite muminsi 1 ikomye MC yahinduwe ya sima ya sima nayo yerekanaga imikurire yerekanwe kuri Ca (OH) 2, hejuru ya AFt imwe nayo yari yuzuyeho imiterere ya firime ya MC, naho AFt yerekanaga imiterere ya morfologiya yo gukura kwama cluster. Ariko, ugereranije, AFt kristal muri MC yahinduwe ya sima ya sima ifite igipimo kinini kinini cya diameter na morphologie yoroheje, yerekana morphologie isanzwe.

HEMC na MC byombi byadindije gahunda yo gutangiza hakiri kare ya sima kandi byongera ubwiza bwigisubizo, ariko itandukaniro ryimiterere ya AFt morphologie yatewe na bo ryari rikiri ingirakamaro. Ibintu byavuzwe haruguru birashobora gusobanurwa neza ukurikije imiterere ya molekulire ya selile ether na AFt kristaliste. Renaudin n'abandi. yashizemo AFt ikomatanya mugisubizo cyateguwe na alkali kugirango ubone "AFT itose", hanyuma uyikuramo igice hanyuma uyumisha hejuru yumuti wuzuye wa CaCl2 wuzuye (35% ugereranije nubushuhe) kugirango ubone "AFt yumye". Nyuma y’ubushakashatsi bunononsoye bwakozwe na Raman spectroscopy na X-ray ifu itandukanya, byagaragaye ko nta tandukaniro riri hagati yizo nzego zombi, gusa icyerekezo cyo gukora kristaliste ya selile cyahindutse mugukama, ni ukuvuga mugikorwa cyibidukikije guhinduka kuva "gutose" ukajya "byumye", kristu ya AFt yakoze selile kumurongo usanzwe wiyongera buhoro buhoro. Kirisitu ya AFt ikurikira c icyerekezo gisanzwe cyabaye gito. Igice cyibanze cyibice bitatu-bigizwe numurongo usanzwe, b umurongo usanzwe na c umurongo usanzwe utandukanijwe. Mugihe b bisanzwe byakosowe, kristu ya AFt yegeranye hamwe nibisanzwe, bikavamo igice kinini cyambukiranya selile mu ndege ya ab bisanzwe. Rero, niba HEMC "ibitse" amazi menshi kurenza MC, ibidukikije "byumye" birashobora kugaragara mugace kegereye, bigateranya gukusanya hamwe no gukura kwa kristu ya AFt. Patural n'abandi. yasanze kuri CE ubwayo, urwego rwo hejuru rwa polymerisation (cyangwa uburemere bwa molekile nini), niko ubukonje bwa CE bugenda neza ndetse nuburyo bwiza bwo gufata amazi. Imiterere ya molekulire ya HEMCs na MCS ishyigikira iyi hypothesis, hamwe nitsinda rya hydroxyethyl rifite uburemere bunini cyane kuruta hydrogene.

Mubisanzwe, kristu ya AFt izashiraho kandi igwe gusa mugihe ion zingirakamaro zigeze kwiyuzuzamo muri sisitemu yo gukemura. Kubwibyo, ibintu nkibisobanuro bya ion, ubushyuhe, agaciro ka pH hamwe nuburinganire bwumwanya mubisubizo bya reaction birashobora kugira ingaruka zikomeye kuri morphologie ya kristu ya AFt, kandi ihinduka ryimiterere ya synthèse artificiel irashobora guhindura morphologie ya kristu ya AFt. Kubwibyo, igipimo cya kristu ya AFt muburyo busanzwe bwa sima hagati yibi byombi bishobora guterwa nikintu kimwe cyo gukoresha amazi mugihe cyo gutangira sima hakiri kare. Ariko, itandukaniro muri morphologie ya AFT iterwa na HEMC na MC igomba guterwa ahanini nuburyo bwihariye bwo gufata amazi. Hemcs na MCS birema "umugozi ufunze" wo gutwara amazi muri microzone ya sima nshya, bigatuma "igihe gito" aho amazi "yoroshye kwinjira kandi bigoye gusohoka." Ariko, muriki gihe, ibidukikije byamazi muri microzone no hafi yayo nabyo birahinduka. Ibintu nka ion kwibanda, pH, nibindi, Guhindura ibidukikije bikura bigaragarira no mubiranga morphologique biranga kristu ya AFt. Iyi "funga loop" yo gutwara amazi isa nuburyo bwibikorwa byasobanuwe na Pourchez nabandi. HPMC igira uruhare mukubungabunga amazi.

3. Umwanzuro

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. Uburebure na diameter igereranya ya ettringite kristal muri MC yahinduwe sima slurry nini, ni inshinge-nkoni. Crystal ya ettringite mubisanzwe sima ya sima ifite igereranyo kiri hagati yibi byombi.

(3) Ingaruka zitandukanye za selile ebyiri za selile kuri morphologie ya ettringite ahanini biterwa no gutandukanya uburemere bwa molekile.