Te awenga o te cellulose ether ki runga i te wera o te whakamakuku o nga momo ciment me te ore kotahi

ko nga paanga o te cellulose ether i runga i te wera whakamahana o Portland ciment, sulfoaluminate ciment, tricalcium silicate me te tricalcium aluminate i roto i te 72h i whakatauritehia e te whakamatautau calorimetry isothermal. Ko nga hua e whakaatu ana ka taea e te cellulose ether te whakaiti i te whakaheke me te tere o te wera o te Portland ciment me te tricalcium silicate, a ko te whakahekenga o te paanga ki te whakaheke me te tere o te wera o te tricalcium silicate he mea nui ake. Ko te painga o te cellulose ether i runga i te whakaheke i te tere o te wera o te whakamahana o te ciment sulfoaluminate he tino ngoikore, engari he ngoikore te painga ki te whakapai ake i te tere o te wera o te whakamahana o te tricalcium aluminate. Ko te Ether Cellulose ka uruhia e etahi hua whakamakuku, na reira ka whakaroa i te whakamaaramatanga o nga hua whakamaarama, katahi ka pa ki te reiti tuku wera o te hydration o te ciment me te ore kotahi.

kupu matua:cellulose ether; Sima; Kore kotahi; Te wera o te hydration; whakaurunga

1. Kupu Whakataki

Ko te cellulose ether he mea whakakaha nui me te kai pupuri wai i roto i te kumete whakauru maroke, te raima whakakoi-whaiaro me etahi atu mea hanga sima hou. Heoi, ka whakaroa hoki te cellulose ether i te whakamakuku sima, he mea pai ki te whakapai ake i te waa whakahaere o nga rawa e pa ana ki te raima, te whakapai ake i te riterite o te kumete me te ngaro o te wa o te raima, engari ka whakaroa pea te ahunga whakamua. Ina koa, ka pa he kino ki runga i te kumete me te raima e whakamahia ana i roto i nga ahuatanga taiao iti. Na reira, he mea tino nui ki te mohio ki te ture o te cellulose ether i runga i te kinetics hydration ciment.

I rangahau nahanaha a OU raua ko Pourchez i nga paanga o nga tawhā irapoo penei i te taumaha ngota o te cellulose ether, te momo whakakapinga, te tohu whakakapinga ranei i runga i nga kinetika whakamakuku sima, a he maha nga whakatau nui: Ko te kaha o te hydroxyethyl cellulose ether (HEC) ki te whakaroa i te whakamakuku o te wai. He kaha ake te ciment i te methyl cellulose ether (HPMC), hydroxymethyl ethyl cellulose ether (HEMC) me te methyl cellulose ether (MC). I roto i te cellulose ether kei roto te methyl, ko te iti iho o te ihirangi methyl, ko te kaha ake o te kaha ki te whakaroa i te wai o te ciment; Ko te iti o te taumaha ngota o te cellulose ether, ka kaha ake te kaha ki te whakaroa i te whakamakuku o te ciment. Ko enei whakatau he turanga putaiao mo te whiriwhiri tika i te cellulose ether.

Mo nga waahanga rereke o te ciment, ko te paanga o te cellulose ether i runga i te kinetics hydration ciment he raruraru tino raruraru i roto i nga tono miihini. Heoi, karekau he rangahau mo tenei ahuatanga. I roto i tenei pepa, ko te awe o te cellulose ether i runga i nga kinetics hydration o Portland ciment noa, C3S(tricalcium silicate), C3A(tricalcium aluminate) me te sulfoaluminate ciment (SAC) i akohia ma te whakamatautau calorimetry isothermal, kia mohio ake ai te taunekeneke me te tikanga o roto i waenga i te cellulose ether me nga hua hydration ciment. Ka whakarato ano i te putake putaiao mo te whakamahi tika o te cellulose ether i roto i nga rawa hanga-sima, ka whakarato hoki i te kaupapa rangahau mo te taunekeneke i waenga i etahi atu whakaurunga me nga hua hydration ciment.

2. Whakamatau

2.1 Rawa Rawa

(1) Sima Portland noa (P·0). I hangaia e Wuhan Huaxin Cement Co., LTD., Ko te tohu he P · 042.5 (GB 175-2007), ka whakatauhia e te roangaru whakamararatanga-momo X-ray fluorescence spectrometer (AXIOS matatau, PANalytical Co., LTD.). E ai ki te tātaritanga o te rorohiko JADE 5.0, i tua atu i nga kohuke clinker ciment C3S, C2s, C3A, C4AF me te gypsum, ko nga rauemi mata sima he konupūmā pākawa waro.

(2) sima sulfoaluminate (SAC). Ko te sima sulfoaluminate tere tere i hangaia e Zhengzhou Wang Lou Cement Industry Co., Ltd. ko R.Star 42.5 (GB 20472-2006). Ko ona roopu matua ko te konupūmā sulfoaluminate me te dicalcium silicate.

(3) tricalcium silicate (C3S). Pēhia te Ca(OH)2, SiO2, Co2O3 me H2O i te 3:1:0.08: Ko te ōwehenga papatipu o te 10 i konatunatua rite, ka pehia i raro i te pehanga tonu o te 60MPa hei hanga pire matomato porotakaroa. I calcined te pire i te 1400 ℃ mo te 1.5 ~ 2 h i roto i te silicon-molybdenum rod teitei oumu hiko pāmahana, a ka neke ki roto i te oumu ngaruiti mo etahi atu whakamahana ngaruiti mo te 40min. I muri i te tangohanga o te pire, ka whakamatao ohorere, ka pakaru tonu, ka werohia tae noa ki te iti iho i te 1.0% te ihirangi o te CaO koreutu i roto i te hua kua oti.

(4) tricalcium aluminate (c3A). Ko te CaO me te A12O3 i konatunatua kia rite, ka werohia i te 1450 ℃ mo te 4 haora i roto i te oumu hiko silicon-molybdenum rod, ka hurihia ki te paura, me te tote tonu kia iti iho te ihirangi o te CaO kore utu i te 1.0%, a ko nga tihi o C12A7 me CA ko kare i arohia.

(5) ether cellulose. Ko nga mahi o mua i whakatairitehia nga paanga o nga momo ethers cellulose e 16 ki runga i te reiti whakamahana me te tere o te tuku wera o te sima Portland noa, ka kitea he rereke nga rereke rereke o nga momo etera cellulose i runga i te ture whakamahana me te tuku wera o te sima, me te tātari i te tikanga o roto. o tenei rereketanga nui. E ai ki nga hua o nga rangahau o mua, e toru nga momo o te cellulose ether e kitea ana te kaha whakamuri i runga i nga sima Portland noa i tohua. Ko enei ko te hydroxyethyl cellulose ether (HEC), hydroxypropyl methyl cellulose ether (HPMC), me te hydroxyethyl methyl cellulose ether (HEMC). Ko te viscosity o te cellulose ether i inehia e te viscometer hurihuri me te kukume whakamatautau o te 2%, te mahana o te 20 ℃ me te tere hurihuri o te 12 r / min. Ko te viscosity o te cellulose ether i inehia e te viscometer hurihuri me te kukume whakamatautau o te 2%, te mahana o te 20 ℃ me te tere hurihuri o te 12 r / min. Ko te tohu whakakapi molar o te cellulose ether e whakaratohia ana e te kaiwhakanao.

(6) Wai. Whakamahia te wai maturu tuarua.

2.2 Tikanga whakamatautau

Te wera o te wai. Ko te TAM Air 8-channel inethermal calorimeter i hangaia e TA Instrument Company i tangohia. Ko nga rawa mata katoa ka mau tonu te pāmahana ki te whakamatautau i te pāmahana (penei i te (20± 0.5) ℃) i mua i te whakamatautau. Tuatahi, 3 g ciment me te 18 mg cellulose ether paura i tapirihia ki roto i te calorimeter (ko te 0.6%) te ōwehenga papatipu o te cellulose ether ki te mea cemellative. I muri i te whakaranu katoa, ka tapirihia te wai whakauru (te wai maturu tuarua) kia rite ki te owehenga wai-sima kua tohua, ka oho riterite. Na, ka tere te maka ki roto i te calorimeter mo te whakamatautau. Ko te 1.1 te ōwehenga wai-binder o te c3A, a ko te ōwehenga-wai-wai o era atu taonga cimentitious e toru he 0.45.

3. Nga hua me te matapaki

3.1 Nga hua whakamatautau

Ko nga paanga o te HEC, HPMC me te HEMC ki runga i te reiti tuku wera whakamahana me te reiti tuku wera o te raima Portland noa, C3S me C3A i roto i nga haora 72, me nga paanga o te HEC i runga i te tere o te wera whakamahana me te reiti tuku wera o te sulfoaluminate ciment. i roto i nga haora 72, ko HEC te cellulose ether me te kaha whakaroa i te whakamahana o etahi atu ciment me te ore kotahi. Ko te whakakotahi i nga paanga e rua, ka kitea na te whakarereketanga o te hanganga rauemi cimentitious, he rereke nga paanga o te cellulose ether ki te tere o te tuku wera whakamahana me te tukunga wera whakahiato. Ko te etera cellulose kua tohua ka tino whakaitihia te whakaheke me te tere o te tuku wera o te sima Portland noa me te C, S, te nuinga ka roa te wa whakaurunga, ka whakaroa i te ahua o te hydration me te tihi tuku wera, i roto i era te cellulose ether ki te C, S hydration me Ko te roa o te tukunga wera he tino kitea atu i te whakamaarama sima o Portland me te roa o te tuku wera; Ka taea hoki e te cellulose ether te whakaroa i te tere tuku wera o te sulfoaluminate ciment hydration, engari ko te kaha whakaroa he tino ngoikore, me te nuinga o te whakaroa i te hydration i muri i te 2 h; Mo te tere tuku wera o te C3A hydration, he ngoikore te kaha o te cellulose ether.

3.2 Te tātari me te matapaki

Ko te tikanga o te cellulosic ether e whakaroa ana i te whakamakuku sima. Silva et al. i whakapaehia ko te cellulosic ether te whakanui ake i te viscosity o te otinga pore me te aukati i te tere o te nekehanga katote, na reira ka whakaroa te whakamakuku ciment. Heoi ano, he maha nga tuhinga kua ruarua tenei whakapae, i te mea kua kitea e o raatau whakamatautau he kaha ake te kaha o nga etera cellulose me te iti o te pokey ki te whakaroa i te whakamakuku sima. Inaa, he poto rawa te wa o te nekehanga katote, te heke ranei, kaore e rite ki te wa o te whakaroa o te whakamakuku sima. Ko te adsorption i waenga i te cellulose ether me nga hua hydration ciment e kiia ana ko te tino take mo te whakaroa o te hydration ciment e te cellulose ether. Ko te Ether Cellulose he ngawari ki te whakauru ki te mata o nga hua whakamakuku penei i te konupūmā waihā, te CSH gel me te konupūmā aluminate hydrate, engari ehara i te mea ngawari ki te whakauru e te ettringite me te waahi kore, me te kaha o te whakauru o te cellulose ether i runga i te konupūmā waihā he teitei ake i te ko te CSH gel. Na reira, mo nga hua whakamaarama ciment noa o Portland, ko te cellulose ether te kaha o te whakaroa i runga i te konupūmā waihā, te kaha o te whakaroa i runga i te konupūmā, te tuarua o te whakaroa i runga i te CSH gel, me te ngoikore rawa o te ettringite.

Ko nga rangahau o mua kua whakaatuhia ko te whakauru i waenga i te polysaccharide kore-ionic me te waahanga kohuke ko te nuinga o te hononga hauwai me te matatini matū, a ko enei paanga e rua ka puta i waenga i te roopu hydroxyl o te polysaccharide me te waikawa whakarewa i runga i te mata kohuke. Liu et al. ka whakarōpūtia ano te whakaurunga i waenga i te polysaccharides me te whakarewa waiwai hei tauwhitinga waikawa-papa, me te polysaccharides hei waikawa me te waiwai whakarewa hei turanga. Mo te polysaccharide kua hoatu, ko te alkalinity o te mata kohuke e whakatau ana i te kaha o te taunekeneke i waenga i nga polysaccharides me nga kohuke. I roto i nga wahanga reera e wha i akohia i tenei pepa, ko nga mea whakarewa matua, ko nga mea whakarewa-kore ko Ca, Al me Si. E ai ki te raupapa o te mahi whakarewa, ko te kawakoretanga o o ratou hauwai ko Ca(OH)2>Al(OH3>Si(OH)4. Inaa, he waikawa te otinga o Si(OH)4, kaore e uru ki te cellulose ether. ko te ihirangi o Ca(OH)2 i runga i te mata o nga hua whakamakuku ciment e whakatau ana i te kaha adsorption o nga hua hydration me te cellulose ether No te mea te konupūmā waihā, CSH gel (3CaO·2SiO2·3H20), ettringite (3CaO·Al2O3·3CaSO4·32H2O). me te konupūmā aluminate hydrate (3CaO·Al2O3·6H2O) i roto i te ihirangi o te waikura parakore o CaO he 100%, 58.33%, 49.56% me te 62 .2%. aluminate>CSH gel> ettringite, e rite ana ki nga hua i roto i nga tuhinga.

Ko nga hua whakamakuku o c3S ko te Ca(OH) me te csH gel, me te cellulose ether he pai te whakaroa ki a raatau. No reira, ko te etera cellulose he tino whakaroa i runga i te hydration C3s. I tua atu i te c3S, kei roto ano hoki i te ciment Portland noa te whakamakuku C2s he puhoi ake, na reira ka kore e kitea te hua whakaroa o te cellulose ether i te timatanga. Ko nga hua whakamahana o te silicate noa kei roto ano te ettringite, a he kino te paanga o te whakaroa o te cellulose ether. Na reira, ko te kaha whakaroa o te cellulose ether ki nga c3s he kaha ake i tera o te raima Portland noa i kitea i te whakamatautau.

Ko te C3A ka memeha me te whakaheke tere ina tutaki ki te wai, a ko nga hua whakamakuku ko te C2AH8 me te c4AH13, ka tukuna te wera o te wai. Ka tae te otinga o te C2AH8 me te c4AH13 ki te waikura, ka hangaia te whakamaaramatanga o te C2AH8 me te C4AH13 hexagonal sheet hydrate, a ka heke te tere o te tauhohenga me te wera o te wai i te wa ano. Na te whakauru o te cellulose ether ki te mata o te calcium aluminate hydrate (CxAHy), ko te aroaro o te cellulose ether ka whakaroa i te whakamaaramatanga o te C2AH8 me te C4AH13 hexagonal-plate hydrate, ka mutu te heke o te tere o te tauhohenga me te tere o te tuku wera o te wai. o C3A parakore, e whakaatu ana ko te cellulose ether he ngoikore te kaha whakatere ki te C3A hydration. He mea tika kia mohio kei roto i tenei whakamatautau, he ngoikore te kaha o te cellulose ether ki te whakahekenga o te c3A parakore. Heoi, i roto i te sima Portland noa, na te mea ka tauhohe te c3A me te gypsum ki te hanga ettringite, na te awe o te toenga o te ca2+ i roto i te otinga slurry, ka whakaroa te cellulose ether i te hanganga o te ettringite, na reira ka whakaroa i te whakamakuku o c3A.

Mai i nga paanga o te HEC, HPMC me te HEMC i runga i te whakaheke me te tere o te tuku wera me te whakawhitinga o te wera o te sima Portland noa, C3S me C3A i roto i te 72 haora, me nga paanga o te HEC ki te whakaheke me te tere o te wera me te whakawhitinga wera o te sulfoaluminate. ciment i roto i te 72 h, ka kitea i roto i nga ethers cellulose e toru kua tohua, Ko te kaha o te whakaroa i te wai o c3s me te Portland ciment i kaha rawa atu i te HEC, i muri mai i te HEMC, me te ngoikore i roto i te HPMC. Mo te taha ki te C3A, ko te kaha o te toru o nga cellulose ethers ki te whakatere i te whakamakuku he rite ano te raupapa, ara, ko te HEC te kaha, ko te HEMC te tuarua, ko te HPMC te ngoikore me te kaha. Na tenei i whakapumautia e te cellulose ether kua whakaroa te hanganga o nga hua whakamakuku o nga rauemi whakaraera.

Ko nga hua whakamakuku matua o te ciment sulfoaluminate ko te ettringite me te Al(OH)3 gel. Ko te C2S i roto i te sima sulfoaluminate ka whakamakuku motuhake kia hanga Ca(OH)2 me te cSH gel. No te mea ka taea te warewarehia te adsorption o te cellulose ether me te ettringite, a he tere rawa te hydration o te sulfoaluminate, no reira, i te timatanga o te hydration, he iti te paanga o te cellulose ether ki te reiti tuku wera o te sulfoaluminate ciment. Engari ki tetahi wa o te whakamakuku, na te mea ka wehe wehe nga c2s ki te whakaputa Ca(OH)2 me te CSH gel, ka whakaroa enei hua whakamakuku e rua e te cellulose ether. No reira, i kitea ko te cellulose ether i whakaroa i te whakamakuku o te ciment sulfoaluminate i muri i te 2 haora.

4. Whakamutunga

I roto i tenei pepa, na roto i te whakamatautau calorimetry inehethermal, ka whakatauritehia te ture awe me te hanga o te cellulose ether ki runga i te wera whakamahana o te sima Portland noa, c3s, c3A, sulfoaluminate ciment me etahi atu waahanga rereke me te ore kotahi i roto i te 72 h. Ko nga whakatau matua e whai ake nei:

(1) Ka taea e te Cellulose ether te whakaiti i te tere o te wera o te wera o te Portland ciment me te tricalcium silicate, me te painga o te whakaiti i te tere o te tuku wera o te tricalcium silicate he nui ake; Ko te painga o te cellulose ether ki te whakaheke i te wera o te wera o te sulfoaluminate ciment he tino ngoikore, engari he ngoikore te painga ki te whakapai ake i te tere o te wera o te tricalcium aluminate.

(2) ko te cellulose ether ka uruhia e etahi hua whakamakuku, na reira ka whakaroa i te whakamaaramatanga o nga hua hydration, e pa ana ki te tere o te tuku wera o te hydration sima. He rereke te momo me te nui o nga hua whakamakuku mo nga waahanga rereke o te pire ciment ore, na reira kaore i te rite te paanga o te cellulose ether ki o raatau wera whakamahana.