Methyl selulose ether kubushyuhe bwicyumba ikiza ultra-high performance beto

Ibisobanuro: Muguhindura ibiri muri hydroxypropyl methylcellulose ether (HPMC) mubushyuhe busanzwe bukiza ultra-high performance beto (UHPC), ingaruka za selile ya ether ya selile kumazi, gushiraho igihe, imbaraga zo kwikuramo, nimbaraga za flexural ya UHPC. , axial tensile imbaraga nigiciro cyanyuma, kandi ibisubizo byasesenguwe. Ibisubizo by'ibizamini byerekana ko: kongeramo bitarenze 1.00% yubukonje buke HPMC ntabwo bigira ingaruka kumazi ya UHPC, ariko bigabanya gutakaza amazi mugihe runaka. , no kongera igihe cyo gushiraho, kunoza cyane imikorere yubwubatsi; iyo ibirimo biri munsi ya 0,50%, ingaruka kumbaraga zo kwikomeretsa, imbaraga za flexural nimbaraga za axial tensile imbaraga ntizihambaye, kandi iyo ibirimo bimaze kuba hejuru ya 0,50%, imashini yacyo Imikorere igabanuka kurenza 1/3. Urebye imikorere itandukanye, dosiye isabwa ya HPMC ni 0,50%.

Amagambo y'ingenzi: ultra-high performance beto; selile ether; ubushyuhe busanzwe; imbaraga zo guhonyora; imbaraga zidasanzwe; imbaraga

0、Ijambo ry'ibanze

Iterambere ryihuse ry’inganda z’ubwubatsi mu Bushinwa, ibisabwa mu mikorere ifatika mu buhanga nyabwo na byo byariyongereye, kandi byakozwe na ultra-high performance beto (UHPC) byakozwe kugira ngo bisubizwe. Ikigereranyo cyiza cyibice bifite ubunini butandukanye bwateguwe muburyo bwa teoritiki, kandi buvanze na fibre fibre hamwe nogukoresha amazi meza cyane, ifite ibintu byiza nka ultra-high compressive power, ubukana bukabije, kwihanganira ihungabana ryinshi no kwikiza gukomeye. ubushobozi bwa micro-crack. Imikorere. Ubushakashatsi bwikoranabuhanga mumahanga kuri UHPC burakuze kandi bwakoreshejwe mubikorwa byinshi bifatika. Ugereranije n’ibihugu by’amahanga, ubushakashatsi bwo mu gihugu ntabwo bwimbitse bihagije. Dong Jianmiao nabandi bize fibre yongeyeho ubwoko butandukanye nubwinshi bwa fibre. Uburyo bwo guhindura amategeko n'amategeko ya beto; Chen Jing n'abandi. yize ku ngaruka za diameter ya fibre fibre kumikorere ya UHPC uhitamo fibre fibre ifite diameter 4. UHPC ifite umubare muto wubwubatsi bukoreshwa mubushinwa, kandi iracyari mubyiciro byubushakashatsi. Imikorere ya UHPC Superiority yabaye imwe mubyerekezo byubushakashatsi bwiterambere rifatika, ariko haracyari ibibazo byinshi byakemuka. Nkibisabwa cyane kubikoresho fatizo, igiciro kinini, inzira igoye yo gutegura, nibindi, bigabanya iterambere ryikoranabuhanga rya UHPC. Muri byo, ukoresheje amavuta yumuvuduko mwinshi Gukiza UHPC mubushyuhe bwinshi birashobora gutuma ibona ibikoresho bya tekinike kandi biramba. Ariko, kubera uburyo butoroshye bwo gukiza amavuta hamwe nibisabwa cyane kubikoresho bikenerwa, ikoreshwa ryibikoresho rishobora kugarukira gusa ku mbuga zabugenewe, kandi kubaka-ntibishobora gukorwa. Kubwibyo, ntibikwiye gukoresha uburyo bwo gukiza ubushyuhe mumishinga ifatika, kandi birakenewe gukora ubushakashatsi bwimbitse kubushyuhe busanzwe bukiza UHPC.

Ubushyuhe busanzwe bukiza UHPC buri mubyiciro byubushakashatsi mubushinwa, kandi igipimo cyacyo cyo guhuza amazi ni gito cyane, kandi gikunda kubura umwuma mwinshi hejuru mugihe cyo kubaka. Kugirango tunoze neza ikibazo cyo kubura umwuma, ibikoresho bishingiye kuri sima mubisanzwe byongeramo umubyimba ugumana amazi mubikoresho. Imiti ikoreshwa kugirango irinde gutandukanya no kuva amaraso yibikoresho, kongera amazi no guhuriza hamwe, kunoza imikorere yubwubatsi, ndetse no kunoza neza imiterere yubukorikori bwibikoresho bishingiye kuri sima. Hydroxypropyl methyl selulose ether (HPMC) nka polymer Thickener, ishobora gukwirakwiza neza polymer gelled slurry hamwe nibikoresho mubikoresho bishingiye kuri sima neza, kandi amazi yubusa muri slurry azahinduka amazi aboshye, kuburyo bitoroshye kubura kuva guhubuka no kunoza imikorere yo gufata amazi ya beto .Mu rwego rwo kugabanya ingaruka za selulose ether ku mazi ya UHPC, selulose ether-viscosity nkeya yatoranijwe kugirango ikizamini.

Muncamake, murwego rwo kunoza imikorere yubwubatsi hashingiwe ku kwemeza imiterere yubukanishi bwubushyuhe busanzwe bukiza UHPC, iyi mpapuro yiga ku ngaruka ziterwa na selile nkeya ya selireose ether ku gukiza ubushyuhe busanzwe bushingiye ku miti ya selire ya ether. nuburyo bwayo bwibikorwa muri UHPC. Ingaruka zamazi, igihe coagulation, imbaraga zo kwikuramo, imbaraga zidasanzwe, imbaraga za axial tensile imbaraga nigiciro cyanyuma cya UHPC kugirango hamenyekane urugero rukwiye rwa selile.

1. Gahunda yikizamini

1.1 Gerageza ibikoresho fatizo no kuvanga igipimo

Ibikoresho fatizo byiki kizamini ni:

1) Isima: P.·O 52.5 sima isanzwe ya Portland yakozwe muri Liuzhou.

2) Furuka ivu: Furuka ivu ikorerwa muri Liuzhou.

3) Ifu ya Slag: S95 yamenetse itanura rya feri ya slag yakozwe muri Liuzhou.

4) Umwotsi wa Silica: igice cya kodegisi ya silika fume, ifu yumukara, ibirimo SiO2≥92%, ubuso bwihariye 23 m²/ g.

5) Umusenyi wa Quartz: 20 ~ 40 mesh (0.833 ~ 0.350 mm).

6) Kugabanya amazi: kugabanya amazi ya polycarboxylate, ifu yera, igipimo cyo kugabanya amazi≥30%.

7) Ifu ya Latex: ifu ya redxersible.

8) Fibre ether: hydroxypropyl methylcellulose METHOCEL yakozwe muri Amerika, viscosity 400 MPa s.

9) Fibre y'ibyuma: fibre igororotse ya microwire fibre, diameterφ ni 0,22 mm, uburebure ni mm 13, imbaraga zingana ni 2 000 MPa.

Nyuma yubushakashatsi bwinshi bwubushakashatsi mubyiciro byambere, birashobora kwemezwa ko igipimo cyibanze cyo kuvanga ubushyuhe busanzwe bukiza beto ikora cyane ni sima: ivu ryisazi: ifu yubutaka: ifu ya silika: umucanga: kugabanya amazi: ifu ya latex: amazi = 860: 42: 83: 110: 980: 11: 2: 210, ingano ya fibre yibikoresho ni 2%. Ongeraho 0, 0.25%, 0.50%, 0,75%, 1.00% HPMC ya selile ya ether (HPMC) kuriyi mibare shingiro yo kuvanga Shiraho ubushakashatsi bugereranya.

1.2 Uburyo bwo kugerageza

Gupima ifu yumye ibikoresho fatizo ukurikije igipimo cyo kuvanga hanyuma ubishyire muri HJW-60 imwe-itambitse ya shitingi ihatira kuvanga beto. Tangira kuvanga kugeza igihe kimwe, ongeramo amazi hanyuma uvange muminota 3, uzimye mixer, ongeramo fibre ipima ipima hanyuma utangire kuvanga muminota 2. Byakozwe muri UHPC.

Ibintu byikizamini birimo gutembera, gushiraho igihe, imbaraga zo kwikuramo, imbaraga zidasanzwe, imbaraga za axial tensile imbaraga nagaciro keza cyane. Ikizamini cya fluidity cyagenwe ukurikije JC / T986-2018 “Ibikoresho bya sima bishingiye kuri sima”. Ikizamini cyo kugena igihe ukurikije GB / T 1346-2011 “Isima isanzwe ikoreshwa neza no gukoresha uburyo bwo gupima igihe”. Ikizamini cyingufu za flexural cyagenwe hakurikijwe GB / T50081-2002 “Igipimo cyuburyo bwikizamini cyuburyo bwa mashini ya beto isanzwe”. Ikizamini cyingufu zo gukomeretsa, imbaraga za axial tensile nimbaraga zanyuma zipima agaciro zagenwe hakurikijwe DLT5150-2001 "Amabwiriza yikizamini cya Hydraulic".

2. Ibisubizo by'ibizamini

2.1 Amazi

Ibisubizo by'ibizamini bya fluidity byerekana ingaruka zibirimo HPMC mugutakaza amazi ya UHPC mugihe. Byagaragaye uhereye ku kizamini cyo gupima ko nyuma yo gutembera nta selile ya selile yatewe neza, ubuso bukunda kubura umwuma no gukonjesha, kandi amazi yatakaye vuba. , kandi akazi karangiritse. Nyuma yo kongeramo selile ya selile, nta ruhu rwigeze ruba hejuru, gutakaza amazi mugihe byari bike, kandi gukora byakomeje kuba byiza. Mubipimo byikizamini, gutakaza byibuze kwamazi byari mm 5 muminota 60. Isesengura ryamakuru yikizamini ryerekana ko, Ingano ya selile-viscosity selulose ether ntacyo ihindura kumazi ya mbere ya UHPC, ariko igira uruhare runini mukubura amazi mugihe runaka. Iyo nta selulose ether yongeyeho, gutakaza amazi ya UHPC ni mm 15; Ubwiyongere bwa HPMC, gutakaza amazi ya minisiteri bigabanuka; iyo dosiye ari 0,75%, gutakaza amazi ya UHPC niyo ntoya hamwe nigihe, ni 5mm; nyuma yibyo, hamwe no kwiyongera kwa HPMC, gutakaza amazi ya UHPC hamwe nigihe hafi idahindutse.

NyumaHPMCivanze na UHPC, bigira ingaruka kumiterere ya rheologiya ya UHPC mubice bibiri: kimwe nuko micro-bubles yigenga izanwa mubikorwa bitera imbaraga, bigatuma igiteranyo hamwe nisazi ivu nibindi bikoresho bigira "umupira wumupira", byongera Uwiteka gukora Muri icyo gihe, umubare munini wibikoresho bya sima birashobora gupfunyika igiteranyo, kugirango igiteranyo gishobora "guhagarikwa" kuringaniza muburyo bworoshye, kandi gishobora kugenda mubwisanzure, ubushyamirane buri hagati buragabanuka, kandi amazi ariyongera; icya kabiri nukwongera UHPC Imbaraga zifatika zigabanya amazi. Kubera ko ikizamini gikoresha ubukonje buke HPMC, igice cya mbere gihwanye nigice cya kabiri, kandi amazi yambere ntabwo ahinduka cyane, ariko gutakaza amazi mugihe birashobora kugabanuka. Ukurikije isesengura ryibisubizo byikizamini, birashobora kumenyekana ko kongera umubare ukwiye wa HPMC muri UHPC bishobora guteza imbere cyane imikorere yubwubatsi bwa UHPC.

2.2 Gushiraho igihe

Uhereye kumihindagurikire yigihe cyo gushiraho UHPC yibasiwe nubunini bwa HPMC, birashobora kugaragara ko HPMC igira uruhare runini muri UHPC. Umubare munini niwo, biragaragara ko ingaruka zo kudindiza ari. Iyo amafaranga ari 0,50%, igihe cyo gushiraho minisiteri ni 55min. Ugereranije nitsinda rishinzwe kugenzura (min 40), ryiyongereyeho 37.5%, kandi kwiyongera ntibyari bigaragara. Iyo dosiye yari 1.00%, igihe cyo gushiraho minisiteri cyari min 100, cyari hejuru ya 150% ugereranije nitsinda rishinzwe kugenzura (40 min).

Imiterere ya molekulire iranga selile ether igira ingaruka ku ngaruka zayo. Imiterere yibanze ya molekulire muri selile ya selile, ni ukuvuga imiterere yimpeta ya anhydroglucose, irashobora kwitwara hamwe na calcium ion kugirango ikore isukari-calcium ya molekile ivanze, igabanye igihe cyo kwinjiza ciment clinker hydration reaction Ubushuhe bwa ioni calcium ni buke, bikarinda gukomeza kugwa kwimvura Ca (OH) 2, kugabanya umuvuduko wa hydrata reaction ya sima, bityo bigatinda gushiraho sima.

2.3 Imbaraga zo guhonyora

Uhereye ku isano iri hagati yimbaraga zo kwikuramo ingero za UHPC muminsi 7 niminsi 28 nibiri muri HMPC, birashobora kugaragara neza ko kwiyongera kwa HPMC byongera buhoro buhoro kugabanuka kwimbaraga zo kwikuramo UHPC. 0,25% HPMC, imbaraga zo kwikuramo UHPC zigabanukaho gato, naho igipimo cyo gukomera ni 96%. Ongeraho 0,50% HPMC nta ngaruka zigaragara ku kigero cyo gukomeretsa imbaraga za UHPC. Komeza wongere HPMC murwego rwo gukoresha, UHPC's Imbaraga zo kwikuramo zagabanutse cyane. Iyo ibikubiye muri HPMC byiyongereye kugera kuri 1.00%, igipimo cyo gukomeretsa cyagabanutse kugera kuri 66%, kandi gutakaza imbaraga byari bikomeye. Ukurikije isesengura ryamakuru, birakwiye ko wongera 0,50% HPMC, kandi gutakaza imbaraga zo kwikuramo ni bito

HPMC ifite ingaruka zimwe zo kwinjiza ikirere. Kwiyongera kwa HPMC bizatera umubare munini wa mikorobe muri UHPC, bizagabanya ubwinshi bwubwinshi bwa UHPC buvanze. Nyuma yo gukomera, gukomera bizagenda byiyongera buhoro buhoro kandi compactness nayo izagabanuka, cyane cyane ibirimo HPMC. Hejuru. Byongeye kandi, hamwe no kwiyongera kwinshi kwa HPMC yatangijwe, haracyari polymers nyinshi zihindagurika mumyenge ya UHPC, zidashobora kugira uruhare runini mugukomera kwiza no gushyigikirwa mugihe matrix ya compte ya cimentité ihagaritswe. .Nuko rero, kwiyongera kwa HPMC bigabanya cyane imbaraga zo kwikuramo UHPC.

2.4 Imbaraga zoroshye

Uhereye ku isano iri hagati yimbaraga za flexural ya UHPC ingero kuminsi 7 niminsi 28 nibiri muri HMPC, birashobora kugaragara ko impinduka zimpinduka zimbaraga zingufu nimbaraga zo guhonyora zisa, hamwe no guhindura imbaraga zingirakamaro hagati ya 0 na 0.50% ya HMPC ntabwo ari imwe. Nkuko kwiyongera kwa HPMC byakomeje, imbaraga za flexural za UHPC zagabanutse cyane.

Ingaruka za HPMC ku mbaraga zoroshye za UHPC ziri mubice bitatu: selile ether ya selile ifite ingaruka mbi kandi zangiza ikirere, bigabanya imbaraga zoroshye za UHPC; naho igice cya gatatu ni polymer yoroheje ikorwa na selile ether, Kugabanya ubukana bwikigereranyo bidindiza kugabanuka kwingufu zingirakamaro zicyitegererezo gato. Kubaho icyarimwe muribi bintu bitatu bigabanya imbaraga zo kwikuramo urugero rwa UHPC kandi bikanagabanya imbaraga zihindagurika.

2.5 Axial tensile imbaraga nigiciro cyanyuma

Isano iri hagati yimbaraga zingutu za UHPC kuri 7 d na 28 d nibiri muri HMPC. Hamwe no kwiyongera kwibirimo muri HPMC, imbaraga zingana zingero za UHPC zabanje guhinduka gake hanyuma zigabanuka vuba. Imbaraga zingana zingana zerekana ko iyo ibikubiye muri HPMC murugero bigeze kuri 0,50%, imbaraga za axial tensile imbaraga zurugero rwa UHPC ni 12.2MPa, naho igipimo cyingufu zingana ni 103%. Hamwe no kwiyongera kwinshi kwa HPMC yikigereranyo, axial Hagati ya tensile imbaraga imbaraga zatangiye kugabanuka cyane. Iyo HPMC yibigize urugero yari 0,75% na 1.00%, igipimo cyingufu zingana cyari 94% na 78%, ibyo bikaba byari munsi yimbaraga za axial tensile ya UHPC idafite HPMC.

Uhereye ku isano iri hagati yindangagaciro za UHPC ntangarugero muminsi 7 niminsi 28 nibiri muri HMPC, birashobora kugaragara ko indangagaciro za tensile ntizihinduka hamwe no kwiyongera kwa selile ether mugitangira, nigihe ibikubiye muri selulose ether igera kuri 0,50% hanyuma itangira kugabanuka vuba.

Ingaruka yinyongera ya HPMC kumbaraga za axial tensile imbaraga nigiciro cyanyuma cyurugero rwa UHPC yerekana inzira yo kuguma hafi idahindutse hanyuma ikagabanuka. Impamvu nyamukuru nuko HPMC ishobora gukorwa muburyo butaziguye hagati ya sima ya hydrata ya hydrata Igice cya firime idafite amazi ya polymer ifunga amazi bigira uruhare mugushiraho ikimenyetso, kuburyo amazi runaka abikwa muri UHPC, atanga amazi akenewe kugirango iterambere rikomeze ryiyongere. ya sima, bityo bikazamura imbaraga za sima. Kwiyongera kwa HPMC bitezimbere ubufatanye bwa UHPC butanga ubunebwe nubworoherane, bigatuma UHPC ihuza rwose no kugabanuka no guhindura ibintu shingiro, kandi igahindura gato imbaraga zingutu za UHPC. Ariko, iyo ibiri muri HPMC birenze agaciro gakomeye, umwuka winjiye ugira ingaruka kumbaraga. Ingaruka mbi zagiye zigira uruhare runini, kandi imbaraga za axial tensile imbaraga nigiciro cyanyuma cyikigereranyo cyatangiye kugabanuka.

3. Umwanzuro

1) HPMC irashobora kunoza imikorere yimikorere yubushyuhe busanzwe bukiza UHPC, ikongerera igihe coagulation kandi ikagabanya igihombo cyamazi ya UHPC ivanze vuba mugihe.

2) Kwiyongera kwa HPMC bizana umubare munini wibibyimba bito mugihe cyo gukurura ibishishwa. Niba umubare ari munini cyane, ibituba bizateranya cyane kandi bibe binini. Igicucu kirahuza cyane, kandi ibituba ntibishobora kurengerwa no guturika. Imyenge ya UHPC ikomye iragabanuka; mubyongeyeho, polymer yoroheje yakozwe na HPMC ntishobora gutanga inkunga ikaze mugihe iri mukibazo, kandi imbaraga zo guhonyora no guhindagurika ziragabanuka cyane.

3) Kwiyongera kwa HPMC bituma UHPC plastike kandi ihinduka. Imbaraga zingirakamaro hamwe nigiciro cyanyuma cya UHPC ntagishobora guhinduka cyane hamwe no kwiyongera kwa HPMC, ariko iyo HPMC irenze agaciro runaka, Imbaraga za axial tensile nimbaraga zanyuma zaragabanutse cyane.

4) Mugihe utegura ubushyuhe busanzwe bukiza UHPC, dosiye ya HPMC igomba kugenzurwa cyane. Iyo igipimo ari 0,50%, isano iri hagati yimikorere nubukanishi bwubushyuhe busanzwe bukiza UHPC burashobora guhuzwa neza.