Ingaruka ya selulose ether kubushyuhe bwa hydration ya sima itandukanye hamwe nubutare bumwe

Ingaruka za selulose ether ku bushyuhe bwa hydrata ya sima ya Portland, sima ya sulfoaluminate, silikate ya tricalcium na tricalcium aluminate muri 72h byagereranijwe nikizamini cya isothermal calorimetry. Ibisubizo byerekana ko ether ya selile ishobora kugabanya cyane umuvuduko wogusohora nubushyuhe bwa Portland sima na tricalcium silikatike, kandi ingaruka zo kugabanuka kumashanyarazi nubushyuhe bwa trikaliyumu silikatike ni ngombwa cyane. Ingaruka ya selulose ether mukugabanya igipimo cyo kurekura ubushyuhe bwa hydrata ya sulfoaluminate sima irakomeye cyane, ariko igira ingaruka nke mukuzamura igipimo cyo kurekura ubushyuhe bwa hydration ya tricalcium aluminate. Ether ya selile izamamazwa nibicuruzwa bimwe na bimwe bitanga amazi, bityo bikadindiza korohereza ibicuruzwa biva mu mazi, hanyuma bikagira ingaruka ku gipimo cy’ubushyuhe bw’amazi ya sima hamwe n’ubutare bumwe.

Amagambo y'ingenzi:selile ether; Isima; Ubutare bumwe; Ubushuhe; adsorption

1. Intangiriro

Cellulose ether nikintu cyingenzi cyo kubyimba hamwe nigikoresho cyo kubika amazi mumashanyarazi avanze yumye, beto yikora-yonyine hamwe nibindi bikoresho bishya bishingiye kuri sima. Nyamara, selulose ether nayo izadindiza hydrata ya sima, ifasha kunoza igihe cyimikorere yibikoresho bishingiye kuri sima, kunoza imiterere ya minisiteri no gutakaza igihe cyo guta igihe, ariko kandi bishobora kudindiza iterambere ryubwubatsi. By'umwihariko, bizagira ingaruka mbi kuri minisiteri na beto ikoreshwa mubihe by'ubushyuhe buke. Kubwibyo, ni ngombwa cyane gusobanukirwa amategeko ya selulose ether kuri sima hydration kinetics.

OU na Pourchez bakoze ubushakashatsi kuri gahunda zingaruka za molekuline nkuburemere bwa molekuline ya selile ya selile, ubwoko bwinsimburangingo cyangwa urwego rwo gusimbuza sima hydration kinetics, maze bafata imyanzuro myinshi yingenzi: Ubushobozi bwa hydroxyethyl selulose ether (HEC) bwo gutinza hydration ya hydration ya sima isanzwe ikomeye kuruta iya methyl selulose ether (HPMC), hydroxymethyl ethyl selulose ether (HEMC) na methyl selulose ether (MC). Muri ether ya selile irimo methyl, munsi ya methyl, niko ubushobozi bwo gutinza hydrata ya sima; Kugabanya uburemere bwa molekuline ya selile ether, nubushobozi bukomeye bwo gutinza hydrata ya sima. Iyi myanzuro itanga ishingiro ryubumenyi bwo guhitamo selulose ether neza.

Kubice bitandukanye bya sima, ingaruka za selulose ether kuri sima hydration kinetics nayo nikibazo gihangayikishije cyane mubikorwa bya injeniyeri. Ariko, nta bushakashatsi kuri iyi ngingo. Muri iyi nyandiko, ingaruka za selile ya selile kuri hydration kinetics ya sima isanzwe ya Portland, C3S (tricalcium silicate), C3A (tricalcium aluminate) na sima ya sulfoaluminate (SAC) yakozwe hakoreshejwe ikizamini cya calorimetrie isothermal, kugirango urusheho gusobanukirwa imikoranire no uburyo bwimbere hagati ya selile ether nibicuruzwa bitanga sima. Itanga ubundi bumenyi bwa siyanse yo gukoresha neza selile ya selile mubikoresho bishingiye kuri sima kandi ikanatanga ishingiro ryubushakashatsi kumikoranire hagati yizindi mvange nibicuruzwa bitanga amazi ya sima.

2. Ikizamini

2.1 Ibikoresho bito

(1) sima isanzwe ya Portland (P · 0). Yakozwe na Wuhan Huaxin Cement Co, LTD., Ibisobanuro ni P · 042.5 (GB 175-2007), bigenwa nuburebure bwikwirakwizwa ryubwoko bwa X-ray fluorescence spectrometer (AXIOS yateye imbere, PANalytical Co, LTD.). Dukurikije isesengura rya software ya JADE 5.0, usibye amabuye y'agaciro ya sima clinker C3S, C2s, C3A, C4AF na gypsumu, ibikoresho bya sima birimo karubone ya calcium.

(2) sima ya sulfoaluminate (SAC). Isima yihuta ya sulfoaluminate yakozwe na Zhengzhou Wang Lou Cement Industry Co., Ltd. ni R.Star 42.5 (GB 20472-2006). Amatsinda yingenzi ni calcium sulfoaluminate na silicike ya dicalcium.

(3) silikatike ya tricalcium (C3S). Kanda Ca (OH) 2, SiO2, Co2O3 na H2O saa 3: 1: 0.08: Umubare rusange wa 10 wavanze neza hanyuma ukanda munsi yumuvuduko uhoraho wa 60MPa kugirango ukore fagitire yicyatsi kibisi. Inyemezabuguzi yabazwe kuri 1400 ℃ kuri 1.5 ~ 2 h mu nkoni ya silicon-molybdenum itanura ry’ubushyuhe bwo hejuru, hanyuma yimurirwa mu ziko rya microwave kugirango irusheho gushyushya microwave kuri 40min. Nyuma yo gukuramo fagitire, yarakonje mu buryo butunguranye kandi imeneka inshuro nyinshi irabarwa kugeza igihe ibikubiye muri CaO yubusa mubicuruzwa byarangiye bitageze kuri 1.0%

(4) tricalcium aluminate (c3A). CaO na A12O3 byavanze neza, bibarwa kuri 1450 ℃ kuri 4 h mu itanura ry’amashanyarazi ya silicon-molybdenum, hasi mu ifu, hanyuma ubarwa inshuro nyinshi kugeza igihe ibirimo CaO yubusa bitari munsi ya 1.0%, kandi impinga ya C12A7 na CA zari birengagijwe.

(5) ether ya selile. Ibikorwa byabanjirije byagereranije ingaruka zubwoko 16 bwa selile ya selile kumashanyarazi no kugabanya ubushyuhe bwa sima isanzwe ya Portland, ugasanga ubwoko butandukanye bwa ether selile zifite itandukaniro rikomeye kumategeko agenga hydrata nubushyuhe bwa sima, anasesengura uburyo bwimbere. y'iri tandukaniro rikomeye. Ukurikije ibyavuye mu bushakashatsi bwabanje, hatoranijwe ubwoko butatu bwa selile ya selile ifite ingaruka mbi zo kudindiza sima isanzwe ya Portland. Harimo hydroxyethyl selulose ether (HEC), hydroxypropyl methyl selulose ether (HPMC), na hydroxyethyl methyl selulose ether (HEMC). Ubukonje bwa selile ya selile yapimwe na viscometer izunguruka ifite ikizamini cya 2%, ubushyuhe bwa 20 ℃ n'umuvuduko wa 12 r / min. Ubukonje bwa selile ya selile yapimwe na viscometer izunguruka ifite ikizamini cya 2%, ubushyuhe bwa 20 ℃ n'umuvuduko wa 12 r / min. Urwego rwo gusimbuza umubyimba wa selile ether itangwa nuwabikoze.

(6) Amazi. Koresha amazi ya kabiri yatoboye.

2.2 Uburyo bwo kugerageza

Ubushuhe. TAM Air 8-umuyoboro wa isothermal calorimeter yakozwe na TA Instrument Company yemejwe. Ibikoresho byose bibisi byagumishijwe ubushyuhe burigihe kugirango bipime ubushyuhe (nka (20 ± 0.5) ℃) mbere yubushakashatsi. Ubwa mbere, sima 3 g na 18 mg ya selulose ether yifu yongewemo muri kalorimetero (igipimo rusange cya selile ya selile nibikoresho bya cemellative byari 0,6%). Nyuma yo kuvanga byuzuye, amazi avanze (amazi ya kabiri yatoboye) yongewemo ukurikije igipimo cy’amazi-sima yagenwe hanyuma akabyutsa neza. Hanyuma, yahise ishyirwa muri calorimeter kugirango igerageze. Ikigereranyo cy’amazi ya c3A ni 1.1, naho igipimo cy’amazi cy’ibindi bikoresho bitatu bya sima ni 0.45.

3. Ibisubizo n'ibiganiro

3.1 Ibisubizo by'ibizamini

Ingaruka za HEC, HPMC na HEMC ku gipimo cyo kurekura ubushyuhe bw’amazi n’igipimo cy’ubushyuhe bwo gukwirakwiza ubushyuhe bwa sima isanzwe ya Portland, C3S na C3A mu masaha ya 72 h, n’ingaruka za HEC ku gipimo cy’ubushyuhe bw’amazi n’igipimo cy’ubushyuhe bwa sulfoaluminate. muri 72 h, HEC ni selile ya selile ifite ingaruka zikomeye zo gutinda kumazi yandi sima hamwe nubutare bumwe. Ufatanije n'ingaruka zombi, urashobora gusanga hamwe no guhindura ibintu bya simaitima, selile ya ether igira ingaruka zitandukanye kubipimo byo gusohora ubushyuhe bwamazi no kurekura ubushyuhe. Ether yatoranijwe ya selile irashobora kugabanya cyane umuvuduko wogusohora nubushyuhe bwa sima isanzwe ya Portland na C, S, byongerera igihe cyigihe cyo kwinjiza, bidindiza isura ya hydration hamwe nubushyuhe bwo kurekura ubushyuhe, muribwo selile ya selulose kuri C, S hydration na gutinda kurekura ubushyuhe biragaragara cyane kuruta Portland ya sima isanzwe ya Portland no gutinda kurekura ubushyuhe; Ether ya selile irashobora kandi gutinza igipimo cyo kurekura ubushyuhe bwa sulfoaluminate ya sima, ariko ubushobozi bwo gutinda burakomeye cyane, kandi ahanini butinda hydrasiyo nyuma ya 2 h; Ku gipimo cyo gusohora ubushyuhe bwa C3A hydration, selile ether ifite ubushobozi bwo kwihuta.

3.2 Isesengura n'ibiganiro

Uburyo bwa selulosike ether itinda sima hydration. Silva n'abandi. yemeje ko ether ya selile yongereye ubwiza bwumuti wa pore kandi ikabuza umuvuduko wimikorere ya ionic, bityo gutinda kwa sima. Nyamara, ubuvanganzo bwinshi bwashidikanyaga kuri iki gitekerezo, kubera ko ubushakashatsi bwabo bwerekanye ko ethers ya selile ifite ububobere buke ifite ubushobozi bukomeye bwo gutinza amazi ya sima. Mubyukuri, igihe cyo kugenda kwa ion cyangwa kwimuka ni kigufi cyane kuburyo bigaragara ko kitagereranywa nigihe cyo gutinda kwa sima. Adorption hagati ya selulose ether nibicuruzwa bitanga amazi ya sima bifatwa nkimpamvu nyayo yo gutinda kwa sima na selile ya ether. Ether ya Cellulose yoroha cyane hejuru yibicuruzwa biva mu mazi nka calcium hydroxide ya calcium, CSH gel na calcium aluminate hydrate, ariko ntabwo byoroshye kumenyeshwa na ettringite na fondi idafite amazi, kandi ubushobozi bwa adsorption ya selile ya selile kuri hydroxide ya calcium irarenze irya CSH gel. Kubwibyo, kubicuruzwa bisanzwe bya Portland sima ya hydrata, ether ya selile ifite gutinda cyane kuri hydroxide ya calcium, gutinda cyane kuri calcium, gutinda kwa kabiri kuri gel ya CSH, no gutinda cyane kuri ettringite.

Ubushakashatsi bwibanze bwerekanye ko adsorption hagati ya polysaccharide itari iyoni na minerval ikubiyemo ahanini guhuza hydrogène no guhuza imiti, kandi izi ngaruka zombi zibaho hagati yitsinda rya hydroxyl ya polysaccharide na hydroxide yicyuma hejuru yubutaka. Liu n'abandi. byongeye gushyira adsorption hagati ya polysaccharide na hydroxide yicyuma nkibikorwa bya aside-fatizo, hamwe na polysaccharide nka acide na hydroxide yicyuma nkibishingiro. Kuri polysaccharide yatanzwe, alkaline yubuso bwamabuye y'agaciro igena imbaraga zimikoranire hagati ya polysaccharide namabuye y'agaciro. Mubice bine bya gelling byizwe muriyi mpapuro, ibyuma nyamukuru cyangwa bitari ibyuma birimo Ca, Al na Si. Ukurikije gahunda yibikorwa byibyuma, alkalinity ya hydroxide yabo ni Ca (OH) 2> Al (OH3> Si (OH) 4. Mubyukuri, igisubizo cya Si (OH) 4 ni acide kandi ntabwo itanga adsor selile. ibikubiye muri Ca (OH) 2 hejuru yibicuruzwa bya hydrata ya sima bigena ubushobozi bwa adsorption yibicuruzwa biva mu mazi hamwe na selile ya selile. na calcium aluminate hydrate (3CaO · Al2O3 · 6H2O) mubirimo okiside ya organique ya CaO ni 100%, 58.33%, 49.56% na 62 .2%. Kubwibyo, gahunda yubushobozi bwabo bwa adsorption hamwe na selile hydroxide> calcium aluminate> CSH gel> ettringite, ijyanye nibisubizo mubitabo.

Ibicuruzwa biva muri c3S birimo Ca (OH) na csH gel, kandi ether ya selile ifite ingaruka nziza yo gutinda kuri bo. Kubwibyo, selile ya ether ifite gutinda kugaragara kuri hydrasi ya C3s. Usibye c3S, sima isanzwe ya Portland nayo irimo C2s hydration itinda, bigatuma ingaruka zo gutinda kwa selile ether zitagaragara mugihe cyambere. Ibicuruzwa biva muri silikate isanzwe nabyo birimo ettringite, kandi ingaruka zo gutinda kwa selile ether ni mbi. Kubwibyo, ubushobozi bwo gutinda kwa selile ether kuri c3s birakomeye kuruta ibya sima isanzwe ya Portland yagaragaye mubizamini.

C3A izashonga kandi ihindure vuba iyo ihuye namazi, kandi ibicuruzwa biva mumazi mubisanzwe ni C2AH8 na c4AH13, kandi ubushyuhe bwamazi buzasohoka. Iyo igisubizo cya C2AH8 na c4AH13 kigeze ku kwiyuzuzamo, kristalisiti ya C2AH8 na C4AH13 ya hydrata yamashanyarazi azashyirwaho, kandi igipimo cyibisubizo hamwe nubushyuhe bwa hydration bizagabanuka icyarimwe. Bitewe na adsorption ya selile ya selile hejuru ya calcium aluminate hydrate (CxAHy), kuba ether ya selile yadindiza kristalisiti ya C2AH8 na C4AH13 ya hydrata-plaque hydrata, bigatuma igabanuka ryikigereranyo nigipimo cyo gusohora ubushyuhe burenze ubwo ya C3A yera, yerekana ko selile ya ether ifite ubushobozi bwihuta bwo kwihuta kuri C3A. Birakwiye ko tumenya ko muri iki kizamini, selile ya selile ifite ubushobozi bwihuta bwihuta bwo kuyobora hydrasi ya c3A. Nyamara, muri sima isanzwe ya Portland, kubera ko c3A izakorana na gypsumu kugirango ikore ettringite, bitewe ningaruka ya ca2 + iringaniza mugisubizo cyihuse, selile ether izadindiza ishingwa rya ettringite, bityo bidindiza hydrasi ya c3A.

Uhereye ku ngaruka za HEC, HPMC na HEMC ku gipimo cyo gutanga amazi no gusohora ubushyuhe hamwe no gukwirakwiza ubushyuhe bwa sima isanzwe ya Portland, C3S na C3A mu masaha ya 72 h, hamwe n'ingaruka za HEC ku gipimo cy’amazi n’ubushyuhe hamwe n’ubushyuhe bukabije bwa sulfoaluminate sima muri 72 h, birashobora kugaragara ko muri ethers eshatu za selulose zatoranijwe, Ubushobozi bwo gutinda kwamazi ya c3s na sima ya Portland bwari bukomeye muri HEC, bukurikirwa na HEMC, nintege nke muri HPMC. Ku bijyanye na C3A, ubushobozi bwa selile eshatu za selile zo kwihutisha hydrasi nazo ziri murwego rumwe, ni ukuvuga, HEC niyo ikomeye, HEMC ni iya kabiri, HPMC nintege nke kandi ikomeye. Ibi byemeje ko selulose ether yatinze gushiraho ibicuruzwa biva mu bikoresho bya gell.

Ibicuruzwa byingenzi byamazi ya sulfoaluminate sima ni ettringite na Al (OH) 3 gel. C2S muri sima ya sulfoaluminate nayo izahindura ukundi kugirango ikore Ca (OH) 2 na cSH gel. Kuberako adsorption ya selulose ether na ettringite irashobora kwirengagizwa, kandi hydrated ya sulfoaluminate irihuta cyane, kubwibyo rero, mugihe cyambere cya hydrasiyo, selile ya ether ntacyo igira ku gipimo cyo gusohora ubushyuhe bwa sima ya sulfoaluminate. Ariko mugihe runaka cya hydrata, kubera ko c2s izahindura hydrata kugirango itange Ca (OH) 2 na CSH gel, ibyo bicuruzwa byombi byamazi bizatinda na selile ya ether. Kubwibyo, byagaragaye ko ether ya selulose yatinze hydrata ya sima ya sulfoaluminate nyuma ya 2 h.

4. Umwanzuro

Muri iyi nyandiko, binyuze mu kizamini cya isothermal calorimetry, amategeko agenga uburyo hamwe nuburyo bwo gushyiraho selile ya selile yubushyuhe bwamazi ya sima isanzwe ya Portland, c3s, c3A, sima ya sulfoaluminate nibindi bice bitandukanye hamwe nubutare bumwe muri 72 h byagereranijwe. Imyanzuro nyamukuru niyi ikurikira:

. Ingaruka ya selulose ether mukugabanya ubushyuhe bwo kurekura ubushyuhe bwa sima ya sulfoaluminate ni ntege nke, ariko igira ingaruka nke mukuzamura igipimo cyo kurekura ubushyuhe bwa tricalcium aluminate.

. Ubwoko nubwinshi bwibicuruzwa biva mu mazi biratandukanye kubice bitandukanye bigize fagitire ya sima, bityo rero ingaruka za selulose ether ku bushyuhe bwa hydratiya ntabwo ari imwe.