Methyl cellulose ether pane tembiricha yekamuri inorapa Ultra-yakakwirira kuita kongiri

Abstract: Nokushandura zvinyorwa zve hydroxypropyl methylcellulose ether (HPMC) muhutano hwemazuva ose kuporesa ultra-high performance concrete (UHPC), mhedzisiro ye cellulose ether pane fluidity, kuisa nguva, kudzvinyirira simba, uye flexural simba reUHPC rakadzidzwa. , axial tensile simba uye yekupedzisira tensile kukosha, uye zvigumisiro zvakaongororwa. Migumisiro yekuedza inoratidza kuti: kuwedzera kwete kupfuura 1.00% ye-low-viscosity HPMC haikanganisi fluidity yeUHPC, asi inoderedza kurasikirwa kwemvura nekufamba kwenguva. , uye kurebesa nguva yekumisa, kuvandudza zvakanyanya kuita kwekuvaka; apo zvinyorwa zvishoma kudarika 0.50%, kukanganisa kwesimba rekumanikidzika, simba rekushandura uye axial tensile simba harina kukosha, uye kana zvinyorwa zvinopfuura 0.50%, maitiro ayo Kushanda kunoderedzwa neanopfuura 1/3. Tichifunga nezvekuita kwakasiyana, iyo yakakurudzirwa dosage yeHPMC ndeye 0.50%.

Mazwi akakosha: Ultra-yakakwirira kuita kongiri; cellulose ether; normal tembiricha kurapa; compressive simba; flexural simba; tensile simba

0,Nhanganyaya

Nekukurumidza kusimudzira kweindasitiri yekuvaka yeChina, izvo zvinodikanwa zvekuita kongiri muinjiniya chaiyo zvakawedzera, uye Ultra-yakakwirira performance kongiri (UHPC) yakagadzirwa mukupindura kudiwa. Iyo yakakwana chikamu chezvikamu zvine hukuru hwakasiyana hukuru hwakagadzirwa, uye hwakasanganiswa nesimbi faibha uye yakakwirira-inoshanda yekudzikisa mvura mumiriri, ine zvinhu zvakanakisa senge Ultra-yakakwira yekumanikidza simba, kusimba kwepamusoro, kusimba kwekuvhunduka uye kupora kwakasimba. kukwanisa kwe micro-cracks. Performance. Tsvagiridzo yetekinoroji yekune dzimwe nyika paUHPC ine hunyanzvi uye yakashandiswa kune akawanda mapurojekiti anoshanda. Kuenzaniswa nenyika dzekunze, tsvakiridzo yemumba haina kudzika zvakakwana. Dong Jianmiao nevamwe vakadzidza iyo fiber incorporation nekuwedzera mhando dzakasiyana uye huwandu hwefiber. The pesvedzero nzira uye mutemo kongiri; Chen Jing et al. akadzidza pesvedzero yesimbi fiber dhayamita pakuita kweUHPC nekusarudza simbi fiber ine 4 madhayamita. UHPC inongori nenhamba diki yeinjiniya kunyorera muChina, uye ichiri mudanho rekutsvagisa theoretical. Kuita kweUHPC Superiority kwave imwe yenzira dzekutsvagisa dzekuvandudza kongiri, asi kuchine matambudziko mazhinji anofanirwa kugadziriswa. Zvakadai sezvinodiwa zvakakwirira zvezvigadzirwa, mutengo wakakwira, wakaoma kugadzirira maitiro, nezvimwewo, kurambidza kuvandudzwa kweUHPC tekinoroji yekugadzira. Pakati pavo, kushandisa high-pressure steam Kurapa kweUHPC pakupisa kwepamusoro kunogona kuita kuti iwane yakakwirira michina zvivakwa uye kusimba. Nekudaro, nekuda kwekuremerwa kwekuporeswa kweutsi uye zvakakwirira zvinodiwa zvemidziyo yekugadzira, kushandiswa kwezvinhu kunogona kungogumira kumayadhi ekutanga, uye kuvaka-munzvimbo hakugone kuitwa. Naizvozvo, hazvina kukodzera kutora nzira yekurapa kwekupisa mumapurojekiti chaiwo, uye zvinodikanwa kuita tsvakiridzo yakadzama pane yakajairika tembiricha yekurapa UHPC.

Tembiricha yakajairwa inorapa UHPC iri munhanho yekutsvagisa muChina, uye chiyero chemvura-kune-binder yakadzikira zvakanyanya, uye inokonzeresa kupera simba kwemvura pamusoro panguva yekuvakwa kwesaiti. Kuti uvandudze zvinobudirira chiitiko chekudzikisa mvura, simenti-yakavakirwa zvinhu zvinowanzowedzera mamwe mvura-inochengetedza thickeners kune zvinyorwa. Kemikari mumiririri kudzivirira kupatsanurwa uye kubuda ropa kwezvinhu, kuwedzera kuchengetwa kwemvura uye kubatana, kunatsiridza mashandiro ekuvaka, uye zvakare zvinobudirira kuvandudza ma mechanic zvivakwa zvesimende-yakavakirwa zvinhu. Hydroxypropyl methyl cellulose ether (HPMC) sepolymer Thickener, iyo inogona kunyatso kugovera iyo polymer gelled slurry uye zvinhu mune simende-based zvinhu zvakaenzana, uye mvura yemahara mune slurry ichava yakasungwa mvura, kuitira kuti hazvisi nyore kurasikirwa kubva. iyo slurry uye inovandudza kushandiswa kwekuchengetedza mvura kwekrete .Kuitira kuderedza kukanganiswa kwe cellulose ether pamvura yeUHPC, low-viscosity cellulose ether yakasarudzwa kuti iedzwe.

Muchidimbu, kuitira kuti uvandudze mashandiro ekuvaka pahwaro hwekuona ma mechanics eyakajairwa-tembiricha yekurapa UHPC, bepa rino rinoongorora mhedzisiro ye low-viscosity cellulose ether yemukati pane yakajairika-tembiricha kurapwa kunoenderana nemakemikari emu cellulose ether. uye maitiro ayo ekuita muUHPC slurry. Kupesvedzera kwemvura, nguva yekubatanidza, simba rekumanikidza, simba rekushanduka-shanduka, axial tensile simba uye yekupedzisira tensile kukosha kweUHPC kuona chiyero chakakodzera cheselulosi ether.

1. Chirongwa chekuedza

1.1 Edzai zvigadzirwa uye musanganiswa ratio

Mabinduru ebvunzo iyi ndeaya:

1) Simende: P·O 52.5 yakajairika Portland simende inogadzirwa muLiuzhou.

2) Fly ash: Fly ash inogadzirwa muLiuzhou.

3) Slag poda: S95 granulated blast furnace slag poda inogadzirwa muLiuzhou.

4) Silika fume: semi-encrypted silica fume, grey poda, SiO2 zvirimo≥92%, nzvimbo chaiyo 23 m²/g.

5) Jecha requartz: 20 ~ 40 mesh (0.833 ~ 0.350 mm).

6) Mvura inoderedza: polycarboxylate mvura inoderedza, chena poda, mvura inoderedza mwero≥30%.

7) Latex poda: redispersible latex poda.

8) Fiber ether: hydroxypropyl methylcellulose METHOCEL yakagadzirwa muUnited States, viscosity 400 MPa s.

9) Simbi fiber: yakatwasuka mhangura-yakapfatwa microwire simbi fiber, dhayamitaφ i 0.22 mm, kureba i13 mm, simba rekuita 2 000 MPa.

Mushure mekutsvagisa kwakawanda kwekuyedza munhanho yekutanga, zvinogona kutariswa kuti iyo yekutanga musanganiswa reshiyo yeyakajairwa tembiricha inorapa yekupedzisira-yakanyanya kuita kongiri simende: dota rekubhururuka: mamineral poda: silica fume: jecha: mvura inoderedza mumiririri: latex poda: mvura = 860: 42: 83: 110:980:11:2:210, iyo simbi fiber volume inokwana 2%. Wedzera 0, 0.25%, 0.50%, 0.75%, 1.00% HPMC ye cellulose ether (HPMC) zvirimo pane iyi basic mix reshiyo Gadzira maedzo ekufananidza zvichiteerana.

1.2 Nzira yekuedza

Weresa hupfu hwakaomeswa zviwanikwa zvinoenderana nechiyero chekusanganisa uye uzviise muHJW-60 imwe-yakatwasuka shaft yakamanikidzwa kongiri musanganisi. Tanga musanganisi kusvika yunifomu, wedzera mvura uye sanganisa kwemaminetsi matatu, bvisa musanganisi, wedzera yakayerwa simbi fiber uye tangazve musanganisi kwemaminitsi maviri. Yakagadzirwa kuita UHPC slurry.

Izvo zvinhu zvekuyedzwa zvinosanganisira fluidity, kuseta nguva, kumanikidza simba, flexural simba, axial tensile simba uye yekupedzisira tensile kukosha. The fluidity test inotarirwa maererano neJC/T986-2018 "Cement-based Grouting Materials". Iyo yekumisikidza nguva bvunzo inoenderana neGB / T 1346-2011 "Cement Standard Consistency Water Consumption uye Setting Time Test Method". Iyo flexural simba bvunzo inotemerwa zvinoenderana neGB/T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete". Compressive simba bvunzo, axial tensile simba uye Yekupedzisira tensile kukosha bvunzo inotemwa zvinoenderana neDLT5150-2001 "Hydraulic Concrete Test Regulations".

2. Miedzo mhinduro

2.1 Liquidity

Iyo fluidity bvunzo mhinduro inoratidza pesvedzero yeHPMC yemukati pakurasikirwa kweUHPC fluidity nekufamba kwenguva. Inoonekwa kubva pane chiitiko chekuyedza kuti mushure meiyo slurry isina cellulose ether inomutswa zvakaenzana, iyo nzvimbo inotapukirwa nekupera mvura uye crusting, uye fluidity inokurumidza kurasika. , uye kushanda kwakadzikama. Mushure mekuwedzera cellulose ether, pakanga pasina ganda pamusoro, kurasikirwa kwemvura nekufamba kwenguva kwaive kudiki, uye kushanda kwakaramba kwakanaka. Mukati meyedzo renji, iyo shoma yekurasikirwa kwemvura yaive 5 mm mumaminetsi makumi matanhatu. Kuongororwa kwedata rekuongorora kunoratidza kuti, Kuwanda kwe-low-viscosity cellulose ether haina zvishoma pamvura yekutanga yeUHPC, asi ine simba guru pakurasikirwa kwemvura nekufamba kwenguva. Kana pasina cellulose ether inowedzerwa, kurasikirwa kwemvura kweUHPC ndeye 15 mm; Nekuwedzera kweHPMC, iyo fluidity kurasikirwa kwedhaka inoderera; kana iyo dosi iri 0.75%, iyo fluidity kurasikirwa kweUHPC ndiyo idiki nekufamba kwenguva, inova 5mm; mushure meizvozvo, nekuwedzera kweHPMC, iyo fluidity kurasikirwa kweUHPC nenguva Inenge isingachinji.

MushureHPMCinosanganiswa neUHPC, inokanganisa rheological properties yeUHPC kubva pamativi maviri: imwe ndeyokuti yakasununguka mabhururu-mabhuru anounzwa mukukurudzira, izvo zvinoita kuti aggregate uye kubhururuka madota uye zvimwe zvinhu zvive "bhora rekuita", izvo zvinowedzera Kushanda kwekushanda Panguva imwecheteyo, huwandu hwakawanda hwemasimende hunogona kuputira chidimbu, kuitira kuti chidimbu chigone "kumisa" zvakaenzana mu slurry, uye chinogona kufamba zvakasununguka, kukakavara pakati pezvibatanidzwa kunoderedzwa, uye fluidity inowedzera; yechipiri ndeyekuwedzera UHPC Simba rakabatana rinoderedza fluidity. Sezvo bvunzo inoshandisa yakaderera-viscosity HPMC, yekutanga chikamu chakaenzana neyechipiri chikamu, uye yekutanga fluidity haina kuchinja zvakanyanya, asi kurasikirwa kwemvura nekufamba kwenguva kunogona kuderedzwa. Zvinoenderana nekuongororwa kwemhedzisiro yebvunzo, zvinogona kuzivikanwa kuti kuwedzera huwandu hwakakodzera hweHPMC kune UHPC kunogona kuvandudza zvakanyanya mashandiro ekuvaka kweUHPC.

2.2 Kuisa nguva

Kubva pane shanduko yenguva yekumisikidzwa kweHPC yakakanganiswa nehuwandu hweHPMC, zvinogona kuonekwa kuti HPMC inoita basa rekudzoreredza muHPC. Iyo yakakura iyo mari, iyo inonyanya kuoneka iyo inononoka mhedzisiro iri. Kana iyo yakawanda iri 0.50%, nguva yekugadzika yedhaka ndeye 55min. Kuenzaniswa neboka rekutonga (40 min), yakawedzera ne 37,5%, uye kuwedzera kwakanga kusati kuri pachena. Kana iyo dosi yaive 1.00%, nguva yekumisikidza yedhaka yaive 100 min, yaive 150% yakakwira kupfuura iyo yeboka rekutonga (40 min).

Hunhu hwemamorekuru hwe cellulose ether hunokanganisa kudzoreredza kwayo. Iyo yakakosha molecular structure mu cellulose ether, ndiko kuti, anhydroglucose ring structure, inogona kuita ne calcium ions kuti igadzire shuga-calcium molecular compounds, kuderedza nguva yekugadzirwa kwe simenti clinker hydration reaction. Ca (OH) 2, kuderedza kumhanya kwe simenti hydration reaction, nekudaro kunonotsa kuseta simende.

2.3 Kudzvinyirira simba

Kubva pahukama huri pakati pesimba rekumanikidza reUHPC sampuli pamazuva e7 nemazuva 28 uye zvinyorwa zveHMPC, zvinogona kuonekwa zvakajeka kuti kuwedzerwa kweHPMC zvishoma nezvishoma kunowedzera kuderera kwesimba rekumanikidza reUHPC. 0.25% HPMC, simba rekumanikidza reUHPC rinodzikira zvishoma, uye iyo yekumanikidza simba reshiyo i96%. Kuwedzera 0.50% HPMC haina mhedzisiro iri pachena pane yekumanikidza simba reshiyo yeUHPC. Ramba uchiwedzera HPMC mukati mechikamu chekushandisa, UHPC's Simba rekumanikidza rakadzikira zvakanyanya. Apo zvirimo zveHPMC zvakawedzera kusvika 1.00%, iyo compressive simba reshiyo yakadonha kusvika 66%, uye kurasikirwa kwesimba kwaive kwakakomba. Zvinoenderana nekuongorora kwedata, zvakanyanya kukodzera kuwedzera 0.50% HPMC, uye kurasikirwa kwesimba rekumanikidza kudiki.

HPMC ine imwe mhepo-entraining maitiro. Kuwedzerwa kweHPMC kunokonzeresa humwe huwandu hwema microbubbles muUHPC, izvo zvinoderedza kuwanda kwehuwandu hwehuchangobva kusanganiswa UHPC. Mushure mekunge slurry yaomeswa, iyo porosity ichawedzera zvishoma nezvishoma uye compactness ichadererawo, kunyanya iyo HPMC yemukati. Higher. Pamusoro pezvo, nekuwedzera kwehuwandu hweHPMC yakaunzwa, kuchine akawanda anochinjika mapolymer mumapores eUHPC, ayo asingakwanisi kuita basa rakakosha mukusimba kwakanaka uye kutsigirwa kwekumanikidza kana matrix yecementitious composite yakamanikidzwa. .Saka, kuwedzerwa kweHPMC kunoderedza zvikuru simba rekumanikidza reUHPC.

2.4 Flexural simba

Kubva paukama huri pakati pesimba rekushanduka kweHPC sampuli pamazuva e7 nemazuva 28 uye zvinyorwa zveHMPC, zvinogona kuonekwa kuti kuchinja kwemasimba emagetsi uye simba rekumanikidzika zvakafanana, uye kuchinja kwesimba remagetsi pakati pe0 ne0.50% yeHMPC haina kufanana. Sezvo kuwedzerwa kweHPMC kuchienderera mberi, simba rekushandura reUHPC samples rakadzikira zvakanyanya.

Mhedzisiro yeHPMC pane simba rekushanduka-shanduka reHPC rinonyanya muzvikamu zvitatu: cellulose ether ine retarding uye air-entraining effects, iyo inoderedza flexural simba reHPC; uye chikamu chechitatu ipolymer inoshanduka inogadzirwa ne cellulose ether, Kuderedza kuoma kwemuenzaniso kunonotsa kuderera kwesimba rekushanduka kwemuenzaniso zvishoma. Kuvapo panguva imwe chete yezvikamu zvitatu izvi kunoderedza simba rekumanikidza remuenzaniso weUHPC uye zvakare kunoderedza simba rekushanduka-shanduka.

2.5 Axial tensile simba uye yekupedzisira tensile kukosha

Hukama huri pakati pekusimba kwesimba reUHPC sampuli pa7 d uye 28 d uye zvirimo zveHMPC. Nekuwedzera kwezviri mukati meHPMC, simba rekusimba reUHPC sampuli rakatanga rachinja zvishoma ndokuzodzikira nekukurumidza. Iyo tensile simba curve inoratidza kuti kana zvirimo zveHPMC mumuenzaniso zvasvika 0.50%, iyo axial tensile simba kukosha kweiyo UHPC specimen i12.2MPa, uye tensile simba reshiyo i103%. Nekuwedzera kwekuwedzera kweiyo HPMC yezvinyorwa zvemuenzaniso, iyo axial Iyo yepakati tensile simba kukosha yakatanga kudonha zvakanyanya. Kana iyo HPMC yemukati yemuenzaniso yaive 0.75% uye 1.00%, iyo tensile simba reshiyo yaive 94% uye 78%, zvichiteerana, iyo yaive yakaderera pane axial tensile simba reUHPC isina HPMC.

Kubva pahukama huri pakati pekupedzisira tensile kukosha kweUHPC samples pamazuva manomwe nemazuva makumi maviri nemasere uye zvirimo muHMPC, zvinogona kuoneka kuti yekupedzisira tensile tsika dzinenge dzisina kuchinjika nekuwedzera kwe cellulose ether pakutanga, uye kana zvirimo. cellulose ether inosvika 0.50 % uye yakabva yatanga kudonha nekukurumidza.

Mhedzisiro yehuwandu hwekuwedzera hweHPMC pane axial tensile simba uye yekupedzisira tensile kukosha kweUHPC zvienzaniso zvinoratidza maitiro ekuchengeta anenge asina kushanduka obva adzikira. Chikonzero chikuru ndechekuti HPMC inogona kuumbwa zvakananga pakati pe hydrated simende zvimedu Chikamu chemvura chisimbiso chepolymer sealing firimu chinotamba basa rekuisa chisimbiso, kuitira kuti imwe mvura inochengetwa muUHPC, iyo inopa mvura inodiwa kuti irambe ichikura yekuwedzera hydration. yesimende, nokudaro kuvandudza simba resimende. Kuwedzerwa kweHPMC kunovandudza Kubatana kweUHPC kunopa slurry nekushanduka-shanduka, izvo zvinoita kuti UHPC igadzirise zvizere kune shrinkage uye deformation yezvinhu zvehwaro, uye inovandudza zvishoma simba rekusimba reHPC. Nekudaro, kana zvirimo zveHPMC zvichidarika kukosha kwakakosha, mweya wakapinda unobata kusimba kwemuenzaniso. Migumisiro yakaipa zvishoma nezvishoma yakaita basa rinotungamirira, uye axial tensile simba uye yekupedzisira tensile kukosha kwemuenzaniso yakatanga kuderera.

3. Mhedziso

1) HPMC inogona kuvandudza zvakanyanya kushanda kweyakajairika tembiricha kurapa UHPC, kurebesa iyo coagulation nguva uye kuderedza fluidity kurasikirwa kweichangobva kusanganiswa UHPC nekufamba kwenguva.

2) Kuwedzerwa kweHPMC kunounza humwe huwandu hwemabhuru madiki panguva yekukurudzira maitiro ekutsvedza. Kana huwandu hwacho hwakanyanya, mabhuru anounganidza akawandisa uye oita mabhuru akakura. Iyo slurry yakabatana zvakanyanya, uye mabhubhu haagone kufashukira uye kuputika. Iyo pores yeiyo yakaoma UHPC inoderera; uyezve, iyo inochinjika polymer inogadzirwa neHPMC haigone kupa tsigiro yakasimba kana iri pasi pekumanikidzwa, uye iyo yekumanikidza uye inoshanduka simba inoderedzwa zvakanyanya.

3) Kuwedzerwa kweHPMC kunoita UHPC plastiki uye inoshanduka. Iyo axial tensile simba uye yekupedzisira tensile kukosha kweUHPC zvienzaniso hazvitombo chinja nekuwedzera kweHPMC zvemukati, asi kana iyo HPMC yemukati ikadarika imwe kukosha, Iyo axial tensile simba uye yekupedzisira tensile hunhu zvinodzikiswa zvakanyanya.

4) Paunenge uchigadzira yakajairika tembiricha kurapa UHPC, iyo dosage yeHPMC inofanira kunyatsodzorwa. Kana iyo dosi iri 0.50%, hukama huri pakati pekushanda kwekushanda uye michina zvimiro zveyakajairwa tembiricha yekurapa UHPC inogona kurongeka zvakanaka.