1. Te wera o te wai
E ai ki te anau tuku o te wera o te hydration i roto i te wā, te tukanga hydration o ciment te nuinga o wehewehea ki e rima nga wahanga, ara, te wā hydration tuatahi (0~15min), te wā whakauru (15min ~ 4h), te wā whakatere me te tautuhinga (4h ~ 8h ), whakapōrearea me te wā pakeke (8h ~ 24h), me te whakaora ~ 28d.
Ko nga hua whakamatautau e whakaatu ana i te wa tuatahi o te whakauru (arā, te wa whakamahana tuatahi), ka 0.1% te nui o te HEMC ki te slurry sima patea, ka piki ake te tihi o te slurry, ka tino piki ake te tihi. Ina te nui oHEMCka piki ki te I runga ake i te 0.3%, ka whakaroa te tihi o waho tuatahi o te slurry, a ka heke haere te uara teitei ki te pikinga o te ihirangi HEMC; Ka tino whakaroa te HEMC i te wa whakauru me te wa whakatere o te slurry ciment, me te nui o te ihirangi, te roa o te wa whakauru, te whakamuri i te waa whakatere, me te iti ake o te tihi o waho; ko te huringa o te ihirangi cellulose ether karekau he paanga ki te roa o te wa whakapoipoi me te wa pumau o te slurry ciment, penei i te Whakaaturanga 3(a) E whakaatu ana ka taea hoki e te cellulose ether te whakaiti i te wera o te whakamahana o te whakapiri ciment i roto i te 72 haora, engari ka roa ake te wera o te whakamahana i te 36 haora, ka iti ake te huringa o te whakamahana o te huka ki runga i te 36 haora, ka iti ake te huringa o te whakamaarama o te huka ki te 36 haora. whakapiri, penei i te Whakaahua 3(b).
Fig.3 Te ia rereke o te reiti tuku wera whakamahana o te whakapiri ciment me nga momo ihirangi o te cellulose ether (HEMC)
2. Māhuatanga echanical：
Na roto i te ako i nga momo etera cellulose e rua me te 60000Pa·s me te 100000Pa·s, i kitea ko te kaha kōpeke o te kumete whakarerekētanga i konatunatua ki te methyl cellulose ether ka heke haere i te pikinga o ona ihirangi. Ko te kaha compressive o te kumete whakarerekē i konatunatua ki te 100000Pa·s viscosity hydroxypropyl methyl cellulose ether i te tuatahi ka piki ake ka heke i te pikinga o ona ihirangi (penei i te Whakaahua 4). E whakaatu ana ko te whakaurunga o te methyl cellulose ether ka tino whakaiti i te kaha o te pupuhi o te kumete ciment. Ka nui ake te nui, ka iti ake te kaha; te iti ake o te pokey, ka nui ake te paanga ki te ngaro o te kaha o te kumete moata; hydroxypropyl methyl cellulose ether Ina iti iho te inenga i te 0.1%, ka taea te whakanui ake i te kaha o te kumete o te kumete. Ka nui ake te inenga i te 0.1%, ka heke te kaha o te kumete o te kumete i te pikinga o te inenga, no reira me whakahaere te inenga ki te 0.1%.
Fig.4 3d, 7d me te 28d te kaha compressive o MC1, MC2 me MC3 moata ciment whakarereke
(Methyl cellulose ether, viscosity 60000Pa·S, i muri nei ka kiia ko MC1; methyl cellulose ether, viscosity 100000Pa·S, i kiia ko MC2; hydroxypropyl methylcellulose ether, viscosity 100000Pa·S, i kiia ko MC3).
3. Cwa rota：
Na roto i te ine i te wa whakarite o te hydroxypropyl methylcellulose ether me te viscosity o 100000Pa·s i roto i nga inenga rereke o te whakapiri ciment, i kitea i te pikinga o te inenga HPMC, ka roa te wa whakatuu tuatahi me te wa whakatuu whakamutunga mo te moata ciment. Ina 1% te kukū, ka tae te wa tautuhinga tuatahi ki te 510 meneti, ka tae te wa tautuhinga whakamutunga ki te 850 meneti. Ka whakatauritea ki te tauira patea, ka whakaroahia te wa whakatuu tuatahi ma te 210 meneti, ka roa te wa whakatuu whakamutunga ma te 470 meneti (penei i te Whakaaturanga 5). Ahakoa he HPMC me te 50000Pa s, 100000Pa s, 200000Pa s ranei, ka taea e ia te whakaroa i te tuunga o te ciment, engari ka whakatauritea ki nga etera cellulose e toru, ka roa te wa whakatuu tuatahi me te wa whakatuu whakamutunga me te pikinga o te viscosity, e whakaatuhia ana i te Whakaahua 6. Ko te mea tenei na te mea ka uruhia te cellulose ether ki runga i te mata o nga matūriki ciment, e aukati ana i te wai kia pa atu ki nga matūriki ciment, na reira ka whakaroa i te whakamakuku o te ciment. Ko te nui ake o te viscosity o te cellulose ether, ka nui ake te matotoru o te paparanga adsorption i runga i te mata o nga matūriki ciment, me te nui ake o te paanga whakaroa.
Fig.5 Te paanga o te ihirangi cellulose ether ki te whakatakoto i te wa o te kumete
Fig.6 Te awenga o nga rereke rereke o te HPMC ki te wa whakatuu o te whakapiri ciment
(MC-5(50000Pa·s), MC-10(100000Pa·s) me MC-20(200000Pa·s))
Methyl cellulose ether me te hydroxypropyl methyl cellulose etera ka nui te roa o te wa whakatuu o te slurry ciment, ka taea te whakarite kia nui te wa me te wai o te slurry ciment mo te tauhohenga wai, me te whakaoti i te raru o te iti o te kaha me te mutunga o te waahi o te slurry ciment i muri i te pakeke. raruraru pakaru.
4. Te pupuri wai:
I akohia te paanga o te ihirangi cellulose ether ki te pupuri wai. Ka kitea ko te piki ake o te ihirangi o te cellulose ether, ka piki ake te tere o te pupuri wai o te kumete, a, ka nui ake te ihirangi o te cellulose ether i te 0.6%, ka mau tonu te reeti pupuri wai. Heoi, i te whakatairite i nga momo etero cellulose e toru (HPMC me te 50000Pa s (MC-5), 100000Pa s (MC-10) me te 200000Pa s (MC-20) he rereke te awe o te viscosity ki te pupuri wai. Ko te hononga i waenga i te reiti pupuri wai ko: MC-5.
Te wa tuku: Apr-28-2024