Nga ahuatanga o te whakapiri ciment i whakarerekehia e te Cellulose Ether

Ma te ine i nga ahuatanga miihini, te reeti pupuri wai, te wa whakarite me te wera o te whakamahana o te cellulose ether me nga rereke rereke i roto i nga inenga rereke o te whakapiri ciment, me te whakamahi i te SEM ki te tātari i nga hua whakamakuku, ko te paanga o te cellulose ether ki te mahi o te whakapiri sima. ako. ture mana. Ko nga hua e whakaatu ana ko te taapiri o te cellulose ether ka taea te whakaroa i te whakamakuku sima, te whakaroa i te whakapakeke me te whakatakotoranga, te whakaiti i te tuku wera o te wai, te whakaroa i te wa ahua o te tihi teitei o te whakamahana, me te pikinga o te paanga ki te piki o te inenga me te pokey. Ka taea e te cellulose ether te whakanui ake i te tere o te pupuri i te wai o te kumete, a ka taea te whakapai ake i te pupuri i te wai o te kumete me te hanganga angiangi-papa, engari ka nui ake te ihirangi i te 0.6%, kaore he mea nui te piki o te paanga o te wai; ko te ihirangi me te pokey nga mea e whakatau ana i te slurry ciment kua whakarereketia te cellulose. I roto i te tono o te cellulose ether moata whakarerekē, ko te inenga me te viscosity me tino whakaaro.

kupu matua:cellulose ether; inenga; whakamuri; pupuri wai

Ko te moata hanga tetahi o nga taonga hanga whare mo nga kaupapa hanga. I nga tau kua pahure ake nei, na te nui o te tono o nga rauemi whakamatao o te pakitara me te whakapai ake i nga whakaritenga anti-crack me te anti-seepage mo nga pakitara o waho, kua tukuna nga whakaritenga teitei ake mo te aukati kapiti, te mahi honohono me te mahi hanga o te kumete. Na nga ngoikoretanga o te nui o te whakamaroketanga o te whakamaroke, te ngoikore o te koretake, me te iti o te kaha here here, he maha nga wa e kore e taea e te kumete tuku iho te whakatutuki i nga whakaritenga hanga, ka raru ranei te takahanga o nga taonga whakapaipai. Pērā i te raima moata, na te mea ka tere te ngaro o te wai o te kumete, ka poto te whakatakotoranga me te wa whakapakeke, ka puta nga raru penei i te pakaruhanga me te pupuhi i te wa o te hanga nui, ka tino pa ki te kounga o te kaupapa. He tere rawa te ngaro o te wai o te kumete tuku iho, a, he iti rawa te whakamakuku sima, na reira he poto te wa whakatuwheratanga o te moata ciment, koinei te mea matua e pa ana ki te mahi o te moata.

Ko te cellulose ether he pai te matotoru me te pupuri i te wai, a kua whakamahia nuitia i roto i te mara o te kumete, a kua waiho hei whakaurunga tino nui hei whakapai ake i te pupuri wai o te kumete me te whakarato i nga mahi hanga, he pai te whakaiti i te hanga me te whakamahi i muri mai o te moata tuku iho. . Ko te raruraru o te mate wai i roto i te reo. Ko te cellulose e whakamahia ana i roto i te kumete ko te methyl cellulose ether (MC), te hydroxypropyl methyl cellulose (HPMC), te hydroxyethyl methyl cellulose ether (HEMC), te hydroxyethyl cellulose ether (HEC), me etahi atu.

Ko tenei pepa e tino rangahau ana i te paanga o te cellulose ether ki runga i te kaha o te mahi (te reiti pupuri wai, te mate wai me te wa whakatuu), nga ahuatanga miihini (te kaha o te kopiri me te kaha here tensile), te ture whakamakuku me te hanganga moroiti o te whakapiri ciment. He tautoko mo nga ahuatanga o te whakapiri sima kua whakarerekehia te cellulose ether me te whakarato tohutoro mo te tono mo te moata kua whakarereketia te cellulose ether.

1. Whakamatau

1.1 Rauemi mata

Sima: Sima Portland noa (PO 42.5) ciment i hangaia e Wuhan Yadong Cement Company, me te waahanga mata motuhake o te 3500 cm²/g.

Cellulose ether: hydroxypropyl methylcellulose ether e wātea ana ki te hokohoko (MC-5, MC-10, MC-20, viscosities o 50,000 Pa·S, 100000 Pa·S, 200000 Pa·S, ia).

1.2 Tikanga

Nga taonga miihini: I roto i te tukanga o te whakarite tauira, ko te inenga o te cellulose ether he 0.0% ~ 1.0% o te papatipu ciment, a ko te 0.4 te tauwehenga wai-ciment. I mua i te taapiri i te wai me te whakakorikori, whakaranuhia te cellulose ether me te ciment kia rite. He whakapiri sima me te rahi tauira 40 x 40 x 40 i whakamahia hei whakamatautau.

Te wa whakarite: Ko te tikanga inenga ka mahia kia rite ki te GB / T 1346-2001 "Cement Standard Consistency Water Consumption, Te Waa Whakaritea, Te Tikanga Whakamatau Whakamau".

Te pupuri i te wai: Ko te whakamatautau mo te pupuri wai o te whakapiri ciment e pa ana ki te paerewa DIN 18555 "Te tikanga whakamatautau mo te moata raima parakore".

Te wera o te hydration: Ka tangohia e te whakamatautau te TAM Air microcalorimeter o TA Instrument Company o te United States, a ko te 0.5 te ōwehenga wai-sima.

Te hua whakamaoritanga: Whakakotahitia te wai me te cellulose ether kia rite, katahi ka whakarite i te slurry ciment, timata te wa, tango tauira i nga wa rereke, whakamutua te hydration ki te ewaro tino mo te whakamatautau, a ko te 0.5 te ōwehenga wai-ciment.

2. Nga hua me te matapaki

2.1 Nga taonga miihini

Mai i te awe o te ihirangi cellulose ether i runga i te kaha, ka kitea ko te pikinga o te MC-10 cellulose ether content, ka heke katoa nga kaha o te 3d, 7d me te 28d; ko te cellulose ether ka tino whakaiti i te kaha o te 28d. Mai i te awe o te viscosity cellulose ether ki te kaha, ka kitea ahakoa he cellulose ether me te 50,000, 100,000, 200,000 ranei, ka heke te kaha o te 3d, 7d, me te 28d. Ka taea hoki te kite ko te cellulose ether Viscosity kaore he paanga nui ki te kaha.

2.2 Te wa whakarite

Mai i te painga o te ihirangi o te 100,000 viscosity cellulose ether i runga i te wa tautuhinga, ka kitea me te pikinga o te ihirangi o te MC-10, ko te wa o te waahi tuatahi me te wa tautuhi whakamutunga ka piki ake. A, no te mea he 1% te ihirangi, ko te wa tautuhinga tuatahi I tae ki te 510min, a ko te wa tautuhinga whakamutunga ka tae ki te 850min. Ka whakatauritea ki te watea, ko te wa whakatuu tuatahi i whakaroahia e te 210min, a ko te wa tautuhinga whakamutunga i whakaroahia e te 470min.

Mai i te awe o te viscosity cellulose ether i runga i te wa whakarite, ka kitea ahakoa ko MC-5, MC-10, MC-20 ranei, ka taea te whakaroa i te tuunga o te ciment, engari ka whakatauritea ki nga etera cellulose e toru, te tautuhinga tuatahi. te wa me te tautuhinga whakamutunga Ka roa te wa me te pikinga o te pokey. Ko tenei na te mea ka taea e te cellulose ether te whakauru ki runga i te mata o nga matūriki ciment, na reira ka kore te wai e pa atu ki nga matūriki ciment, na reira ka whakaroa te whakamakuku 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.

2.3 Reiti pupuri wai

Mai i te ture awe o te ihirangi cellulose ether i runga i te reiti pupuri wai, ka taea te kite i te pikinga o te ihirangi, ka piki te reiti pupuri wai o te kumete, a, ka nui ake te ihirangi cellulose ether i te 0.6%, ko te reeti pupuri wai ko te. pūmau i roto i te rohe. Heoi, ki te whakataurite i nga etera cellulose e toru, he rereke te awe o te pokey ki te tere pupuri wai. I raro i te inenga kotahi, ko te hononga i waenga i te reiti pupuri wai ko: MC-5≤MC-10≤MC-20.

2.4 Te wera o te wai

Mai i te paanga o te momo ether cellulose me te ihirangi i runga i te wera o te hydration, ka kitea i te pikinga o te ihirangi MC-10, ka heke haere te wera exothermic o te hydration, me te wa o te hydration pāmahana teitei neke i muri mai; He nui te awe o te wera o te wai. Na te pikinga o te pokey, ka tino heke te wera o te wai, a, ka tino neke te tihi o te pāmahana i muri mai. E whakaatu ana ka taea e te cellulose ether te whakaroa i te hydration ciment, a ko tona paanga whakamuri e pa ana ki te ihirangi me te pokey o te cellulose ether, e rite ana ki te hua tātaritanga o te wa whakarite.

2.5 Te tātaritanga o nga hua whakamakuku

Mai i te tātaritanga SEM o te hua hydration 1d, ka kitea i te wa e whakauruhia ana te 0.2% MC-10 cellulose ether, ka kitea te nui o te clinker unhydrated me te ettringite me te whakamaarama pai ake. %, ka tino whakahekehia nga tioata ettringite, e whakaatu ana ka taea e te cellulose ether te whakaroa i te whakamahana o te ciment me te hanganga o nga hua whakamahana i te wa ano. Ma te whakatairite i nga momo etero cellulose e toru, ka kitea ka taea e te MC-5 te hanga i te whakamaaramatanga o te ettringite i roto i nga hua o te hydration kia rite tonu, a, he rite tonu te whakamaarama o te ettringite. e pa ana ki te matotoru o te paparanga.

3. Whakamutunga

a. Ko te taapiri o te cellulose ether ka whakaroa i te whakamakuku o te ciment, te whakaroa i te whakapakeke me te whakatakotoranga o te ciment, te whakaiti i te tukunga wera o te whakamakuku, me te whakaroa i te wa ahua o te tihi teitei o te whakamahana. Na te pikinga o te inenga me te viscosity, ka piki ake te paanga whakamuri.

b. Ka taea e te cellulose ether te whakanui ake i te reiti pupuri wai o te kumete, a ka taea te whakapai ake i te pupuri wai o te kumete me te hanganga angiangi-papa. Ko tana pupuri wai e pa ana ki te inenga me te viscosity. Ka nui ake te inenga ki te 0.6%, kaore e tino piki ake te paanga o te pupuri wai.