Mhedzisiro ye cellulose ethers pakushanduka kwezvinhu zvemvura uye hydration zvigadzirwa zve sulphoaluminate simenti paste.

Izvo zvikamu zvemvura uye microstructure evolution mu cellulose ether yakagadziridzwa sulphoaluminate simenti (CSA) slurry yakadzidzwa neyepasi-munda nuclear magnetic resonance uye thermal analyzer. Mhedzisiro yacho yakaratidza kuti mushure mekuwedzerwa kwe cellulose ether, yakashambadza mvura pakati pezvimiro zve flocculation, iyo yaionekwa seyechitatu yekuzorodza peak mune yakachinjika yekuzorodza nguva (T2) spectrum, uye huwandu hwemvura yakashambadza hwakanga huchienderana nemuyero. Mukuwedzera, cellulose ether yakafambisa zvakanyanya kuchinjana kwemvura pakati pemukati uye inter-floc zvimiro zveCSA flocs. Kunyangwe kuwedzera kwe cellulose ether hakuna mhedzisiro pamhando dze hydration zvigadzirwa zve sulphoaluminate simenti, zvinokanganisa huwandu hwezvigadzirwa zve hydration zvezera chairo.

Mazwi akakosha:cellulose ether; sulfoaluminate simenti; mvura; hydration zvigadzirwa

0,Nhanganyaya

Cellulose ether, iyo inogadziriswa kubva kune yakasikwa cellulose kuburikidza neakatevedzana maitiro, inovandudzwa uye yakasvibira kemikari musanganiswa. Common cellulose ethers akadai semethylcellulose (MC), ethylcellulose (HEC), uye hydroxyethylmethylcellulose (HEMC) anoshandiswa zvakanyanya mukurapa, kuvaka uye mamwe maindasitiri. Kutora HEMC semuenzaniso, inogona kuvandudza zvakanyanya kuchengetwa kwemvura uye kuenderana kwePortland simenti, asi kunonoka kumisa simende. Padanho remicroscopic, HEMC inewo mhedzisiro yakakosha pane microstructure uye pore chimiro chesimende paste. Semuenzaniso, iyo hydration product ettringite (AFt) inonyanya kuve yakapfupika tsvimbo-yakaita, uye chikamu chayo chikamu chakaderera; panguva imwecheteyo, nhamba huru yevhavha yakavharwa inounzwa mumushonga we simenti, kuderedza nhamba yekutaurirana pores.

Zvizhinji zvezvidzidzo zviripo pamusoro pesimba re cellulose ethers pane simenti-based zvinhu zvinotarisa paPortland simende. Sulphoaluminate simende (CSA) isimende yakaderera-kabhoni yakazvimiririra kugadzirwa munyika yangu muzana ramakore rechi20, ine anhydrous calcium sulphoaluminate seyo huru mineral. Nekuda kwekuti huwandu hukuru hweAFt hunogona kugadzirwa mushure memvura, CSA ine zvakanakira simba rekutanga, kusamira kwepamusoro, uye kusagadzikana kwekuora, uye inoshandiswa zvakanyanya mundima yekongiri ye3D kudhinda, kugadzirwa kweinjiniya yemugungwa, uye kugadzirisa nekukurumidza munzvimbo dzakadzikira tembiricha. . Mumakore achangopfuura, Li Jian et al. akaongorora pesvedzero yeHEMC paCSA dhaka kubva pamaonero esimba rekumanikidza uye kunyorova kwemvura; Wu Kai et al. akadzidza mhedzisiro yeHEMC pane yekutanga hydration process yeCSA simenti, asi mvura mune yakagadziridzwa CSA simenti Mutemo wekushanduka kwezvikamu uye slurry kuumbwa hazvizivikanwe. Zvichienderana neizvi, basa iri rinotarisa pakugoverwa kweiyo transverse yekuzorodza nguva (T2) muCSA simende slurry isati yasvika uye mushure mekuwedzera HEMC nekushandisa yakaderera-munda nuclear magnetic resonance instrument, uyezve kuongorora kutama uye kuchinja mutemo wemvura mu slurry. Shanduko yekuumbwa kwesamende paste yakadzidzwa.

1. Kuedza

1.1 Raw zvinhu

Simendi mbiri dzekutengesa sulphoaluminate dzakashandiswa, dzakaratidzwa seCSA1 uye CSA2, nekurasikirwa kwekupisa (LOI) kwepasi pe0.5% (chikamu chemazana).

Matatu akasiyana hydroxyethyl methylcelluloses anoshandiswa, ayo anotsanangurwa seMC1, MC2 uye MC3 zvakateerana. MC3 inowanikwa nekusanganisa 5% (chikamu chezhinji) polyacrylamide (PAM) muMC2.

1.2 Kusanganisa ratio

Mhando nhatu dze cellulose ether dzakasanganiswa mu sulphoaluminate simenti zvichiteerana, iwo madosi aive 0.1%, 0.2% uye 0.3% (chikamu chezhinji, zvakafanana pazasi). Iyo yakagadziriswa mvura-samende chiyero ndeye 0.6, uye chiyero chemvura-samende cheyero yemvura-simende ine basa rakanaka uye hapana kubuda ropa kuburikidza nekuedzwa kwekushandisa kwemvura kweiyo chiyero kuenderana.

1.3 Nzira

Iyo yakaderera-munda NMR midziyo inoshandiswa mukuyedza ndiyo PQ⁃001 NMR analyzer kubva kuShanghai Numei Analytical Instrument Co., Ltd. Simba remagineti remagineti rinogara riri 0.49T, iyo proton resonance frequency ndeye 21MHz, uye tembiricha yemagineti inoramba iripo pa32.0.°C. Munguva yekuedzwa, bhodhoro duku regirazi rine cylindrical sample rakaiswa mu probe coil yechiridzwa, uye kutevedzana kweCPMG kwakashandiswa kuunganidza chiratidzo chekuzorora chesimenti paste. Mushure mekushandurwa neiyo correlation analysis software, iyo T2 inversion curve yakawanikwa nekushandisa Sirt inversion algorithm. Mvura ine madhigirii akasiyana erusununguko mune slurry ichave inoratidzirwa neakasiyana ekuzorora epamusoro mune yakachinjika yekuzorodza spectrum, uye nzvimbo yenzvimbo yekuzorora inopindirana zvakanaka nehuwandu hwemvura, zvichibva pane iyo mhando uye zvirimo zvemvura mune slurry. inogona kuongororwa. Kuti ugadzire nyukireya magineti resonance, zvinodikanwa kuve nechokwadi kuti iyo yepakati frequency O1 (yuniti: kHz) yeredhiyo frequency inopindirana nehuwandu hwemagineti, uye O1 inogadziriswa zuva rega rega panguva yekuyedzwa.

Mienzaniso iyi yakaongororwa neTG?DSC neSTA 449C yakasanganiswa thermal analyzer kubva kuNETZSCH, Germany. N2 yakashandiswa semhepo inodzivirira, mwero wekupisa waive gumi°C/min, uye tembiricha yekuongorora yaive 30-800°C.

2. Migumisiro uye nhaurirano

2.1 Kushanduka kwezvikamu zvemvura

2.1.1 Yakavhurwa cellulose ether

Nzvimbo mbiri dzekuzorora (dzinotsanangurwa seyekutanga neyechipiri dzekuzorora dzepamusoro) dzinogona kucherechedzwa zvakajeka munguva yakachinjika yekuzorora (T2) spectra yemaviri e sulphoaluminate simende slurries. Peak yekutanga yekuzorora inotangira kubva mukati meiyo flocculation chimiro, iyo ine yakaderera dhigirii yerusununguko uye pfupi yakachinjika yekuzorora nguva; yechipiri zororo peak rinobva pakati flocculation zvimiro, iyo ine hukuru hukuru rusununguko uye refu transverse kuzorora nguva. Kusiyana neizvi, iyo T2 inoenderana neyekutanga kuzorora peak yemasimende maviri inofananidzwa, nepo yechipiri zororo repamusoro reCSA1 rinoonekwa gare gare. Yakasiyana kubva kune sulphoaluminate simende clinker uye inozvigadzira yega simende, iyo miviri yekuzorodza yepamusoro yeCSA1 neCSA2 inopindirana zvishoma kubva kune yekutanga nyika. Nekufambira mberi kwe hydration, peak yekutanga yekuzorora zvishoma nezvishoma inoita yekuzvimiririra, nzvimbo yacho inodzikira zvishoma nezvishoma, uye inonyangarika zvachose pamaminetsi makumi mapfumbamwe. Izvi zvinoratidza kuti pane imwe nhanho yekutsinhana kwemvura pakati peiyo flocculation chimiro uye flocculation chimiro cheaviri simende paste.

Shanduko yenzvimbo yepamusoro yechipiri yekuzorodza peak uye shanduko yeT2 kukosha inoenderana nepamusoro peiyo peak zvichiteerana inoratidza shanduko yemvura yakasununguka uye yemuviri yakasungwa yemukati yemvura uye shanduko yedhigirii yerusununguko rwemvura mune slurry. . Iko kusanganiswa kwezviviri kunogona kunyatsoratidza iyo Iyo hydration maitiro eiyo slurry. Nekufambira mberi kwe hydration, nzvimbo yepamusoro inoderera zvishoma nezvishoma, uye kuchinja kweT2 kukosha kune kuruboshwe kunowedzera zvishoma nezvishoma, uye kune humwe hukama hunoenderana pakati pavo.

2.1.2 Yakawedzerwa cellulose ether

Kutora CSA2 yakasanganiswa ne 0.3% MC2 semuenzaniso, iyo T2 yekuzorodza spectrum ye sulphoaluminate simenti mushure mekuwedzera cellulose ether inogona kuonekwa. Mushure mekuwedzera cellulose ether, peak yechitatu yekuzorodza inomiririra kushambadza kwemvura ne cellulose ether yakaonekwa panzvimbo iyo yakachinjika yekuzorodza nguva yaive yakakura kupfuura 100ms, uye nzvimbo yepamusoro yakawedzera zvishoma nezvishoma nekuwedzera kwe cellulose ether content.

Huwandu hwemvura pakati pezvimiro zve flocculation hunokanganiswa nekutama kwemvura mukati meiyo flocculation chimiro uye mvura adsorption ye cellulose ether. Naizvozvo, huwandu hwemvura pakati pezvimiro zve flocculation zvinoenderana nemukati pore chimiro che slurry uye mvura adsorption kugona kwe cellulose ether. Nzvimbo yechipiri yekuzorodza peak inosiyana neZvinyorwa zve cellulose ether zvinosiyana nemhando dzakasiyana dzesimende. Nzvimbo yechipiri yekuzorodza peak yeCSA1 slurry yakadzikira zvichienderera nekuwedzera kwe cellulose ether content, uye yaive diki pane 0.3% yemukati. Kusiyana neizvi, nzvimbo yechipiri yekuzorora yepamusoro yeCSA2 slurry inowedzera nguva nenguva nekuwedzera kweselulosi ether yemukati.

Nyora shanduko yenzvimbo yechitatu yekuzorodza peak nekuwedzera kwemukati we cellulose ether. Sezvo nzvimbo yepamusoro inobatwa nehutano hwemuenzaniso, zvakaoma kuona kuti hutano hwemuenzaniso wakawedzerwa hwakafanana kana uchitakura sampuli. Naizvozvo, chiyero chenzvimbo chinoshandiswa kuratidza huwandu hwechiratidzo chechitatu chekuzorora kwepamusoro mumasampuri akasiyana. Kubva pakuchinja kwenzvimbo yetatu yekuzorodza peak nekuwedzera kwemukati we cellulose ether, zvinogona kuoneka kuti nekuwedzera kwemukati we cellulose ether, iyo nzvimbo yechitatu yekuzorodza peak yakaratidza kuwedzera maitiro (mu. CSA1, apo zvinyorwa zveMC1 zvaive 0.3%, zvaive zvakawanda Nzvimbo yechitatu yekuzorora inoderera zvishoma pa 0.2%), zvichiratidza kuti nekuwedzera kwehuwandu hwe cellulose ether, mvura yakashambadza inowedzerawo zvishoma nezvishoma. Pakati peCSA1 slurries, MC1 yakanga ine mvura iri nani kupfuura MC2 neMC3; nepo pakati peCSA2 slurries, MC2 yaive neyakanakisa kunyudza mvura.

Zvinogona kuonekwa kubva pakuchinja kwenzvimbo yechitatu yekuzorodza peak pa unit mass ye CSA2 slurry nenguva pane zviri mukati me 0.3% cellulose ether kuti nzvimbo yechitatu yekuzorodza peak pa unit mass inoderera nekuenderera mberi ne hydration, zvichiratidza. kuti Sezvo hydration rate yeCSA2 ichikurumidza kupfuura iyo ye clinker uye yega-yakagadzirwa simende, cellulose ether haina nguva yekuwedzera mvura adsorption, uye inobudisa mvura yakashambadza nekuda kwekuwedzera kwekukurumidza kwechikamu chemvura mu slurry. Pamusoro pezvo, kushambadza kwemvura kweMC2 kwakasimba kupfuura iyo yeMC1 uye MC3, inofambirana nemhedzisiro yapfuura. Zvinogona kuonekwa kubva mukushandurwa kwenzvimbo yepamusoro pachikamu chechikamu chetatu chekuzorodza cheCSA1 nenguva yakasiyana 0.3% madhasi e cellulose ethers kuti mutemo wekuchinja wechitatu wekuzorora wepamusoro weCSA1 wakasiyana neCSA2, uye nzvimbo yeCSA1 inowedzera muchidimbu mukutanga kwe hydration. Mushure mekuwedzera nekukurumidza, yakadzikira kunyangarika, izvo zvingave zvichikonzerwa nekureba kwenguva yekugwamba kweCSA1. Mukuwedzera, CSA2 ine gypsum yakawanda, hydration iri nyore kuumba yakawanda AFt (3CaO Al2O3 3CaSO4 32H2O), inoshandisa mvura yakawanda yemahara, uye chiyero chekushandiswa kwemvura chinodarika mwero wemvura adsorption ne cellulose ether, iyo inogona kutungamirira kuThe nzvimbo yechitatu yekuzorora yepamusoro yeCSA2 slurry yakaramba ichidzikira.

Mushure mekubatanidzwa kwe cellulose ether, yekutanga neyechipiri zororo repamusoro rakachinja zvakare kune imwe nhanho. Zvinogona kuonekwa kubva pahupamhi hwepamusoro pepamusoro pechipiri chekuzorora chemhando mbiri dzesimende slurry uye itsva slurry mushure mekuwedzera cellulose ether kuti peak upamhi hwechipiri chekuzorora chepamusoro cheslurry chitsva chakasiyana mushure mekuwedzera cellulose ether. kuwedzera, chimiro chepamusoro chinowanzove chakapararira. Izvi zvinoratidza kuti kubatanidzwa kwe cellulose ether kunodzivirira kusanganiswa kwesimende zvimedu kune imwe nhanho, kunoita kuti chimiro che flocculation chive chakasununguka, chinoderedza dhigirii remvura, uye inowedzera chiyero chekusununguka kwemvura pakati pezvimiro zveflocculation. Nekudaro, nekuwedzera kweyero, kuwedzera kwehupamhi hwepamusoro hakusi pachena, uye hupamhi hwepamusoro hwemamwe masampuli hunoderera. Zvingave kuti kuwedzera kweiyo dosage kunowedzera viscosity yechikamu chemvura che slurry, uye panguva imwe chete, adsorption ye cellulose ether kune masimende masimende inokwidziridzwa kuti ikonzere kutenderera. Chiyero chekusununguka kwehunyoro pakati pezvivakwa zvinoderedzwa.

Resolution inogona kushandiswa kutsanangura dhigirii rekuparadzanisa pakati pekutanga neyechipiri zororo repamusoro. Dhigirii rekuparadzanisa rinogona kuverengerwa zvinoenderana nedhigirii rekugadzirisa = (Afirst component-Asaddle)/Afirst component, apo Afirst component neAsaddle inomiririra iyo yakanyanya amplitude yekutanga yekuzorodza peak uye amplitude yenzvimbo yakaderera pakati pezvikomo zviviri, zvichiteerana. Iyo dhigirii yekuparadzanisa inogona kushandiswa kuratidza dhigirii rekuchinjana kwemvura pakati peiyo slurry flocculation chimiro uye flocculation chimiro, uye kukosha kunowanzo 0-1. Kukosha kwepamusoro kweKuparadzana kunoratidza kuti zvikamu zviviri zvemvura zvakanyanya kuoma kuchinjanisa, uye kukosha kwakaenzana ne1 kunoratidza kuti zvikamu zviviri zvemvura hazvigoni kuchinjana zvachose.

Inogona kuonekwa kubva pamigumisiro yekuverenga yedhigirii yekuparadzanisa iyo dhigirii yekuparadzanisa yemasimende maviri pasina kuwedzera cellulose ether yakaenzana, zvose zvinenge 0.64, uye dhigirii yekuparadzanisa inoderedzwa zvakanyanya mushure mekuwedzera cellulose ether. Kune rimwe divi, sarudzo inodzikira zvakanyanya nekuwedzera kwedosi, uye kugadziriswa kwezvikomo zviviri zvinotodonha kusvika ku0 muCSA2 yakasanganiswa ne0.3% MC3, zvichiratidza kuti cellulose ether inosimudzira zvakanyanya kuchinjana kwemvura mukati nepakati flocculation structures . Zvichienderana nenyaya yekuti kubatanidzwa kwe cellulose ether hakuna zvakunoita pane chinzvimbo uye nzvimbo yekutanga yekuzorodza peak, zvinogona kufungidzirwa kuti kuderera kwekugadziriswa kunokonzerwa nekuwedzera kwehupamhi hwechipiri chekuzorodza peak, uye iyo yakasununguka flocculation chimiro inoita kuti kuchinjana kwemvura pakati pemukati nekunze kuve nyore. Uye zvakare, kupindirana kwe cellulose ether mune slurry chimiro kunowedzera kuvandudza dhigirii rekuchinjana kwemvura pakati pemukati nekunze kweiyo flocculation chimiro. Nekune rimwe divi, kugadzirisa kudzikisa mhedzisiro ye cellulose ether paCSA2 yakasimba kupfuura yeCSA1, inogona kunge iri nekuda kwenzvimbo diki chaiyo uye yakakura particle size yeCSA2, iyo inonyanya kunzwisiswa nekupararira mhedzisiro ye cellulose ether mushure. kubatanidzwa.

2.2 Shanduko mukuumbwa kwe slurry

Kubva kuTG-DTG spectra yeCSA1 uye CSA2 slurries hydrated ye 90 min, 150 min uye 1 zuva, zvinogona kuonekwa kuti marudzi ezvigadzirwa zve hydration hazvina kuchinja zvisati zvaitika uye mushure mekuwedzera cellulose ether, uye AFt, AFm uye AH3 zvose. akaumbwa. Zvinyorwa zvinoratidza kuti kuparara kweAFt ndeye 50-120°C; iyo decomposition range yeAFm ndeye 160-220°C; iyo decomposition range yeAH3 ndeye 220-300°C. Nekufambira mberi kwe hydration, kuora kurasikirwa kwemuenzaniso kwakawedzera zvishoma nezvishoma, uye chimiro cheDTG peaks yeAFt, AFm uye AH3 zvishoma nezvishoma zvakava pachena, zvichiratidza kuti kuumbwa kwezvinhu zvitatu zve hydration zvishoma nezvishoma zvakawedzera.

Kubva pachikamu chehuwandu hwechigadzirwa chega chega che hydration mumuenzaniso pamazera akasiyana e hydration, zvinogona kuonekwa kuti AFt chizvarwa chemuenzaniso usina chinhu pazera re 1d inodarika iyo yemuenzaniso yakasanganiswa ne cellulose ether, zvichiratidza kuti cellulose ether ine simba guru pa. iyo hydration ye slurry mushure mekusangana. Pane kumwe kunonoka kuita. Pamaminetsi makumi mapfumbamwe, kugadzirwa kweAFm kwemasampuli matatu kwakaramba kwakafanana; pa90-150 maminetsi, kugadzirwa kweAFm mumuenzaniso usina chinhu kwakanyanyisa kunonoka kupfuura kune mamwe mapoka maviri emasampuli; mushure mezuva re1, zvinyorwa zveAFm mumuenzaniso usina chinhu zvakanga zvakafanana neyomuenzaniso wakavhenganiswa neMC1, uye zvinyorwa zveAFm zveMC2 zvakadzika zvakanyanya mune mamwe masampuli. Kana iri hydration chigadzirwa AH3, chiyero chechizvarwa cheCSA1 blank sample mushure me hydration ye 90 maminetsi yainyanya kunonoka kupfuura iyo ye cellulose ether, asi chiyero chechizvarwa chakanyanya kukurumidza mushure memaminitsi makumi mapfumbamwe, uye AH3 yekugadzirwa kwehuwandu hwemasampuli matatu. zvakaenzana nezuva 1.

Mushure mekunge CSA2 slurry yakanyoroveswa kwe90min uye 150min, huwandu hweAFT hwakagadzirwa mumuenzaniso wakavhenganiswa ne cellulose ether yakanga yakanyanya kuderera pane iyo yemuenzaniso usina chinhu, zvichiratidza kuti cellulose ether yaivawo neimwe nzira yekudzivisa paCSA2 slurry. Mune sampuli pazera re 1d, zvakaonekwa kuti AFt zvinyorwa zvemuenzaniso usina chinhu zvakanga zvichiri pamusoro peiyo yemuenzaniso wakavhenganiswa ne cellulose ether, zvichiratidza kuti cellulose ether ichiri neine imwe mhedzisiro yekudzoreredza pamvura yeCSA2 mushure mekugadzirisa kwekupedzisira, uye dhigirii rekunonoka paMC2 raive rakakura kupfuura iro remuenzaniso wakawedzerwa ne cellulose ether. MC1. Pamaminetsi e90, huwandu hweAH3 hwakagadzirwa nemuenzaniso usina chinhu hwakanga huri zvishoma kudarika iyo yemuenzaniso yakasanganiswa ne cellulose ether; pamaminitsi e150, AH3 yakagadzirwa nemuenzaniso usina chinhu yakapfuura iyo yemuenzaniso yakasanganiswa ne cellulose ether; pazuva re1, iyo AH3 yakagadzirwa nemasamples matatu yaive yakaenzana.

3. Mhedziso

(1) Cellulose ether inogona kukurudzira zvakanyanya kuchinjana kwemvura pakati peiyo flocculation chimiro uye flocculation chimiro. Mushure mekuiswa kwe cellulose ether, cellulose ether inoshambadza mvura muslurry, iyo inotaridzwa seyechitatu yekuzorodza yepamusoro mu transverse yekuzorora nguva (T2) spectrum. Nekuwedzera kwemukati we cellulose ether, kunyura kwemvura ye cellulose ether kunowedzera, uye nzvimbo yechitatu yekuzorodza peak inowedzera. Mvura inotorwa ne cellulose ether inoburitswa zvishoma nezvishoma muchimiro che flocculation ne hydration ye slurry.

(2) Kubatanidzwa kwe cellulose ether kunodzivirira kusanganiswa kwezvikamu zvesimenti kune imwe nhanho, zvichiita kuti chimiro che flocculation chive chakasununguka; uye nekuwedzera kwezviri mukati, iyo liquid phase viscosity ye slurry inowedzera, uye cellulose ether ine simba guru pane simenti particles. Iyo yakakwidziridzwa adsorption mhedzisiro inoderedza chiyero cherusununguko rwemvura pakati pezvimiro zvakatenderedzwa.

(3) Pamberi uye mushure mekuwedzerwa kwe cellulose ether, mhando dze hydration zvigadzirwa mu sulphoaluminate simenti slurry haina kuchinja, uye AFt, AFm uye aluminium glue yakaumbwa; asi cellulose ether yakanonoka zvishoma kuumbwa kwe hydration zvigadzirwa mhedzisiro.