Mhedzisiro ye cellulose ether pakupisa kwe hydration ye simenti yakasiyana uye imwe ore

zvinokonzerwa ne cellulose ether pa hydration heat yePortland simenti, sulfoaluminate simenti, tricalcium silicate uye tricalcium aluminate mu 72h yakaenzaniswa ne isothermal calorimetry test. Zvigumisiro zvinoratidza kuti cellulose ether inogona kuderedza zvakanyanya hydration uye kupisa kusunungurwa kwehuwandu hwePortland simenti uye tricalcium silicate, uye kuderera kwekuita kwe hydration uye kupisa kusunungurwa kwe tricalcium silicate kunonyanya kukosha. Mhedzisiro ye cellulose ether pakudzikisa kupisa kwekuburitsa kwe hydration ye sulfoaluminate simende haina kusimba, asi ine kushaya simba pakuvandudza kupisa kuburitsa mwero we hydration ye tricalcium aluminate. Cellulose ether ichave adsorbed nezvimwe zvigadzirwa zve hydration, nekudaro kunonoka kukwenenzverwa kwezvinhu zve hydration, uye zvino kukanganisa hydration kupisa kuburitsa mwero we simenti uye imwe ore.

Mazwi akakosha:cellulose ether; Cement; Single ore; Kupisa kwe hydration; adsorption

1. Nhanganyaya

Cellulose ether yakakosha yekukora uye inochengetedza mvura mudhaka yakaoma yakasanganiswa, inozvigadzirisa kongiri uye zvimwe zvitsva zvesimende. Nekudaro, cellulose ether ichaitawo kunonoka simende hydration, iyo inobatsira kuvandudza nguva yekushanda yesimende-yakavakirwa zvinhu, kuvandudza dhaka kusawirirana uye kongiri inodonha nguva yekurasikirwa, asi zvakare inogona kunonoka kufambira mberi kwekuvaka. Kunyanya, ichava nemhedzisiro yakaipa padhaka uye kongiri inoshandiswa mumamiriro ekunze ekupisa. Nokudaro, zvakakosha zvikuru kunzwisisa mutemo we cellulose ether pane simenti hydration kinetics.

OU naPourchez vakanyatsoongorora mhedzisiro yemamolecular paramita senge molecular uremu hwe cellulose ether, rudzi rwekutsiva kana dhigirii rekutsiva pane simende hydration kinetics, uye vakaita mhedziso dzakawanda dzakakosha: Kugona kwehydroxyethyl cellulose ether (HEC) kunonoka kuyerera kwe. simende inowanzosimba kupfuura yemethyl cellulose ether (HPMC), hydroxymethyl ethyl cellulose ether (HEMC) uye methyl cellulose ether (MC). Mu cellulose ether ine methyl, iyo yakaderera iyo methyl yemukati, iyo yakasimba kugona kunonoka hydration ye simenti; Kudzikira kwehuremu hwe cellulose ether, ndiko kusimba kwekugona kunonotsa hydration ye simenti. Mhedziso idzi dzinopa hwaro hwesainzi hwekusarudza cellulose ether nemazvo.

Kune zvikamu zvakasiyana zvesimende, mhedzisiro ye cellulose ether pane simende hydration kinetics zvakare idambudziko rinonyanya kunetseka mumainjiniya maapplication. Zvisinei, hapana tsvakurudzo pamusoro pechinhu ichi. Mupepa rino, pesvedzero ye cellulose ether pane hydration kinetics yeyakajairwa Portland simende, C3S(tricalcium silicate), C3A(tricalcium aluminate) uye sulfoaluminate simende (SAC) yakadzidzwa kuburikidza neisothermal calorimetry bvunzo, kuitira kuti uwedzere kunzwisisa kudyidzana uye mukati memaitiro pakati peselulosi ether uye simende hydration zvigadzirwa. Inopa humwe hwaro hwesainzi hwekushandisa zvine musoro kweselulosi ether mune simende-based zvinhu uye zvakare inopa hwaro hwekutsvagisa hwekudyidzana pakati pezvimwe zvinosanganiswa uye simende hydration zvigadzirwa.

2. Muedzo

2.1 Raw Materials

(1) simende yePortland yakajairika (P · 0). Yakagadzirwa naWuhan Huaxin Cement Co., LTD., iyo yakatarwa ndeye P · 042.5 (GB 175-2007), yakatemwa newavelength dispersion-mhando X-ray fluorescence spectrometer (AXIOS advanced, PANalytical Co., LTD.). Zvinoenderana nekuongororwa kweJADE 5.0 software, kuwedzera kune simende clinker zvicherwa C3S, C2s, C3A, C4AF uye gypsum, simende mbishi zvinhu zvinosanganisirawo calcium carbonate.

(2) sulfoaluminate simende (SAC). Iyo inokurumidza yakaoma sulfoaluminate simende inogadzirwa neZhengzhou Wang Lou Cement Industry Co., Ltd. iri R.Star 42.5 (GB 20472-2006). Mapoka ayo makuru ndiwo calcium sulfoaluminate uye dicalcium silicate.

(3) tricalcium silicate (C3S). Dzvanya Ca(OH)2, SiO2, Co2O3 uye H2O pa3:1:0.08: Hureshi yehuwandu hwegumi yakasanganiswa zvakaenzana uye yakatsikirirwa pasi pekumanikidza kwe60MPa kuita cylindrical green billet. Iyo billet yakaverengerwa pa 1400 ℃ kwe 1.5 ~ 2 h musilicon-molybdenum tsvimbo yakakwirira tembiricha yemagetsi muvira, uye yobva yaendeswa muchoto chewa microwave kuti uwedzere kupisa kwe microwave kwe40min. Mushure mekubudisa bhillet, yakangoerekana yatonhodzwa uye yakadzokororwa yakaputsika uye yakaverengerwa kusvika izvo zvemahara CaO muchigadzirwa chakapedzwa zvaive zvisingasviki 1.0%

(4) tricalcium aluminate (c3A). CaO neA12O3 zvakasanganiswa zvakaenzana, zvakaverengerwa pa1450 ℃ kwe4 h musilicon-molybdenum tsvimbo yemagetsi muvira, yakagadzika kuita upfu, uye yakadzokororwa yakaverengerwa kusvika iyo yemahara CaO yaive isingasviki 1.0%, uye mapeaks eC12A7 neCA aive kufuratirwa.

(5) cellulose ether. Basa rekare rakaenzanisa mhedzisiro yemhando gumi nematanhatu dzema cellulose ethers pa hydration uye kupisa kuburitsa mwero weyakajairwa Portland simende, uye yakaona kuti akasiyana ethers cellulose ethers ane misiyano yakakura pane hydration uye kupisa kuburitsa simende mutemo, uye akaongorora iyo yemukati meshini. yemusiyano uyu unokosha. Zvinoenderana nemhedzisiro yeongororo yapfuura, marudzi matatu e-cellulose ether ane pachena kudzoreredza mhedzisiro pane yakajairwa simende yePortland akasarudzwa. Izvi zvinosanganisira hydroxyethyl cellulose ether (HEC), hydroxypropyl methyl cellulose ether (HPMC), uye hydroxyethyl methyl cellulose ether (HEMC). The viscosity ye cellulose ether yakayerwa nerotary viscometer ine test concentration ye2%, tembiricha ye20 ℃ uye kutenderera kumhanya kwe12 r/min. The viscosity ye cellulose ether yakayerwa nerotary viscometer ine test concentration ye2%, tembiricha ye20 ℃ uye kutenderera kumhanya kwe12 r/min. Iyo molar substitution degree ye cellulose ether inopiwa nemugadziri.

(6) Mvura. Shandisa yechipiri distilled mvura.

2.2 Nzira yekuedza

Kupisa kwe hydration. TAM Air 8-channel isothermal calorimeter yakagadzirwa neTA Instrument Company yakagamuchirwa. Zvese zvigadzirwa zvaichengetwa tembiricha yekuyedza tembiricha (senge (20± 0.5) ℃) isati yaedzwa. Kutanga, 3 g simenti uye 18 mg cellulose ether powder yakawedzerwa mu calorimeter (huwandu hwehuwandu hwe cellulose ether kune cemellative material yaiva 0.6%). Mushure mekusanganiswa kwakazara, mvura yakasanganiswa (yechipiri mvura yakasvibiswa) yakawedzerwa maererano nehuwandu hwemvura-samende uye yakamutswa zvakaenzana. Zvadaro, yakakurumidza kuiswa mu calorimeter yekuongorora. Mvura-binder ratio ye c3A ndeye 1.1, uye mvura-binder reshiyo yezvimwe zvinhu zvitatu zvesimende i0.45.

3. Migumisiro uye nhaurirano

3.1 Miedzo mhinduro

Mhedzisiro yeHEC, HPMC uye HEMC pane hydration kupisa kuburitsa mwero uye kuwedzera kupisa kuburitsa mwero weyakajairwa Portland simende, C3S uye C3A mukati me72 h, uye mhedzisiro yeHEC pane hydration kupisa kuburitsa mwero uye kuwedzera kupisa kuburitsa mwero we sulfoaluminate simende. mukati me72 h, HEC ndiyo cellulose ether ine simba rekunonoka kunokonzera hydration yeimwe simende uye imwe ore. Kubatanidza izvo zviviri zvinokonzeresa, zvinogona kuwanikwa kuti nekuchinja kwecementitious zvinhu kuumbwa, cellulose ether ine akasiyana mhedzisiro pane hydration kupisa kuburitsa mwero uye kuwedzera kupisa kuburitswa. Iyo yakasarudzwa cellulose ether inogona kuderedza zvakanyanya hydration uye kupisa kuburitsa mwero weyakajairika Portland simende uye C, S, inonyanya kurebesa induction nguva, inononoka kutaridzika kwe hydration uye kupisa kuburitsa peak, pakati peiyo cellulose ether kuC, S hydration uye kupisa kuburitsa mwero kunonoka kuri pachena kupfuura zvakajairwa Portland simende hydration uye kupisa kuburitsa mwero kunonoka; Cellulose ether inogonawo kunonoka kusunungurwa kwekupisa kwe sulfoaluminate simenti hydration, asi kukwanisa kunonoka hakuna simba, uye kunyanya kunonoka hydration mushure me2 h; Payeyero yekuburitsa kupisa kweC3A hydration, cellulose ether ine hushoma hwekumhanyisa kugona.

3.2 Ongororo nekukurukurirana

Iyo nzira ye cellulosic ether inonoke simende hydration. Silva et al. kufungidzira kuti cellulosic ether yakawedzera viscosity yepore solution uye ichitadzisa chiyero cheionic kufamba, nokudaro kunonoka simende hydration. Zvisinei, mabhuku akawanda akapokana fungidziro iyi, sezvo kuedza kwavo kwakawana kuti cellulose ethers ine yakaderera viscosity ine simba rakasimba rekunonoka simende hydration. Muchokwadi, nguva yekufamba kweion kana kutama ipfupi zvekuti zviri pachena kuti haina kufananidzwa nenguva yekunonoka kwesamende hydration. Iyo adsorption pakati pe cellulose ether uye simende hydration zvigadzirwa zvinoonekwa sechikonzero chaicho chekunonoka kwe simenti hydration ne cellulose ether. Cellulose ether inokwiridzirwa zviri nyore pamusoro pezvigadzirwa zve hydration zvakadai se calcium hydroxide, CSH gel uye calcium aluminate hydrate, asi hazvisi nyore kushambadzirwa ne ettringite uye unhydrated phase, uye adsorption simba re cellulose ether pa calcium hydroxide yakakwirira kudarika. iyo yeCSH gel. Naizvozvo, kune zvakajairwa Portland simende hydration zvigadzirwa, cellulose ether ine kunonoka kwakasimba pacalcium hydroxide, kunonoka kwakasimba pacalcium, kechipiri kunonoka paCSH gel, uye kunonoka kunonoka pa ettringite.

Zvidzidzo zvakapfuura zvakaratidza kuti adsorption pakati isiri-ionic polysaccharide uye mineral phase inonyanya kusanganisira hydrogen bonding uye kemikari yakaoma, uye izvi zviviri zvinokonzeresa zvinoitika pakati peboka rehydroxyl repolysaccharide nesimbi hydroxide pane mineral surface. Liu et al. yakawedzera kuisa adsorption pakati pepolysaccharides uye simbi hydroxides se acid-base kupindirana, ine polysaccharides seasidhi uye simbi hydroxides sezvigadziko. Kune yakapihwa polysaccharide, iyo alkalinity yemamineral surface inotarisa kusimba kwekudyidzana pakati pepolysaccharides nemamineral. Pakati pezvikamu zvina zvegelling zvakadzidzwa mupepa rino, simbi huru kana isiri-simbi inosanganisira Ca, Al uye Si. Zvinoenderana nehurongwa hwekuita kwesimbi, alkalinity yema hydroxides avo iCa(OH)2>Al(OH3>Si(OH)4.Chaizvoizvo,Si(OH)4 solution ine acidic uye haibatise cellulose ether. zvinyorwa zveCa (OH) 2 pamusoro pezvigadzirwa zve simenti zvinogadzirisa zvinogadzirisa adsorption yezvigadzirwa zve hydration uye cellulose ether Nokuti calcium hydroxide, CSH gel (3CaO · 2SiO2 · 3H20), ettringite (3CaO · Al2O3 · 3CaSO4 · 32H2O) uye calcium aluminate hydrate (3CaO · Al2O3 · 6H2O) muhuwandu hweinorganic oxides yeCaO ndeye 100%, 58.33%, 49.56% uye 62 .2%. aluminate> CSH gel> ettringite, iyo inoenderana nemhedzisiro mumabhuku.

Iyo hydration zvigadzirwa zve c3S zvinonyanya zvinosanganisira Ca(OH) uye csH gel, uye cellulose ether ine yakanaka kunonoka mhedzisiro pavari. Naizvozvo, cellulose ether ine kunonoka kuri pachena paC3s hydration. Kunze kweC3S, yakajairika Portland simende inosanganisirawo C2s hydration iyo inononoka, izvo zvinoita kuti kunonoka mhedzisiro ye cellulose ether kusave pachena mukutanga. Iyo hydration zvigadzirwa zveyakajairwa silicate zvakare zvinosanganisira ettringite, uye kunonoka mhedzisiro ye cellulose ether haina kunaka. Naizvozvo, kunonoka kugona kwe cellulose ether kune c3s kwakasimba kupfuura iyo yakajairwa Portland simende yakaonekwa muyedzo.

C3A ichanyunguduka uye hydrate nekukurumidza kana ikasangana nemvura, uye zvigadzirwa zve hydration zvinowanzoita C2AH8 uye c4AH13, uye kupisa kwe hydration kuchaburitswa. Apo mhinduro yeC2AH8 uye c4AH13 inosvika pakuzara, crystallization yeC2AH8 uye C4AH13 hexagonal sheet hydrate ichaumbwa, uye maitiro ekuita uye kupisa kwe hydration kuchaderedzwa panguva imwe chete. Nekuda kwekuiswa kwe cellulose ether kumusoro kwe calcium aluminate hydrate (CxAHy), kuvapo kwe cellulose ether kunonotsa kupenya kweC2AH8 uye C4AH13 hexagonal-plate hydrate, zvichikonzera kudzikira kwekuita kwekuita uye hydration kupisa kuburitsa mwero kupfuura izvozvo. yeC3A yakachena, iyo inoratidza kuti cellulose ether ine kushaya simba kwekukurumidza kuC3A hydration. Izvo zvakakosha kucherechedza kuti muyedzo iyi, cellulose ether ine isina kusimba yekumhanyisa kugona kune hydration ye c3A yakachena. Nekudaro, mune yakajairwa Portland simende, nekuti c3A ichaita negypsum kuti iite ettringite, nekuda kwesimba reca2 + chiyero mune slurry solution, cellulose ether inononoka kuumbwa kwe ettringite, nokudaro kunonoka hydration ye c3A.

Kubva pamhedzisiro yeHEC, HPMC uye HEMC pane iyo hydration uye kupisa kuburitsa mwero uye kuwedzera kupisa kuburitswa kweyakajairwa Portland simende, C3S uye C3A mukati me72 h, uye mhedzisiro yeHEC pane hydration uye kupisa kuburitsa mwero uye kuwedzera kupisa kuburitswa kwe sulfoaluminate. simenti mukati me72 h, zvinogona kuonekwa kuti pakati pematatu e-cellulose ethers akasarudzwa, Kukwanisa kunonoka hydration ye c3s uye Portland simenti yakanga yakasimba muHEC, inoteverwa neHEMC, uye isina simba muHPMC. Nekuda kweC3A, iyo matatu cellulose ethers 'kukwanisa kukurumidzira hydration iriwo muhurongwa hwakafanana, ndiko kuti, HEC ndiyo yakasimba, HEMC yechipiri, HPMC ndiyo isina simba uye yakasimba. Izvi zvakatsigirana kuti cellulose ether yakanonoka kuumbwa kwe hydration zvigadzirwa zve gelling zvinhu.

Iwo makuru hydration zvigadzirwa zve sulfoaluminate simende ndeye ettringite uye Al(OH) 3 gel. Iyo C2S mu sulfoaluminate simenti inozonyurawo zvakasiyana kuita Ca(OH)2 uye cSH gel. Nekuti adsorption ye cellulose ether uye ettringite inogona kufuratirwa, uye hydration ye sulfoaluminate inokurumidza, saka, padanho rekutanga re hydration, cellulose ether haina mhedzisiro pa hydration kupisa kuburitsa mwero we sulfoaluminate simenti. Asi kune imwe nguva ye hydration, nekuti c2s ichaita zvakasiyana hydrate kugadzira Ca (OH) 2 uye CSH gel, izvi zviviri zvigadzirwa zve hydration zvichanonoka ne cellulose ether. Nokudaro, zvakaonekwa kuti cellulose ether yakanonoka hydration ye sulfoaluminate simenti mushure me2 h.

4. Mhedziso

Mune pepa iri, kuburikidza neisothermal calorimetry bvunzo, iyo pesvedzero mutemo uye kugadzira nzira ye cellulose ether pane hydration kupisa kweyakajairwa Portland simende, c3s, c3A, sulfoaluminate simende uye zvimwe zvakasiyana zvikamu uye imwe ore mu72 h yakaenzaniswa. Mhedziso huru ndeiyi:

(1) Cellulose ether inogona kuderedza zvakanyanya hydration kupisa kuburitsa mwero weyakajairika Portland simende uye tricalcium silicate, uye mhedzisiro yekudzikisa hydration kupisa kuburitsa mwero we tricalcium silicate inonyanya kukosha; Mhedzisiro ye cellulose ether pakuderedza kupisa kweyero ye sulfoaluminate simenti haina kusimba, asi ine simba risina simba pakuvandudza kupisa kusunungurwa kwe tricalcium aluminate.

(2) cellulose ether ichave yakashambadzirwa nezvimwe zvigadzirwa zve hydration, nekudaro kunonoka kukwenenzverwa kwezvinhu zve hydration, zvichikanganisa kuburitswa kwekushisa kwe simenti hydration. Mhando uye huwandu hwezvigadzirwa zve hydration zvakasiyana kune zvikamu zvakasiyana zvesimende bill ore, saka mhedzisiro ye cellulose ether pakupisa kwavo kwe hydration haina kufanana.