Nā ʻano o ka ʻili sima i hoʻololi ʻia e ka Cellulose Etera

Ma ke ana ʻana i nā waiwai mechanical, ka hoʻopaʻa ʻana o ka wai, ka hoʻonohonoho ʻana i ka manawa a me ka wela o ka hydration o ka cellulose ether me nā viscosities like ʻole i nā ʻano like ʻole o ka paʻi sima, a me ka hoʻohana ʻana iā SEM e kālai i nā huahana hydration, ʻo ka hopena o ka cellulose ether i ka hana o ka paʻi sima. aʻo ʻia. kanawai o ka mana. Hōʻike nā hopena i ka hoʻohui ʻana o ka cellulose ether hiki ke hoʻopaneʻe i ka hydration cement, hoʻopaneʻe i ka paʻakikī sima a me ka hoʻonohonoho ʻana, hoʻemi i ka hoʻokuʻu ʻana i ka wela hydration, hoʻolōʻihi i ka manawa ʻike ʻia o ke kiʻekiʻe wela o ka hydration, a piʻi ka hopena retarding me ka piʻi ʻana o ka dosage a me ka viscosity. Hiki i ka cellulose ether ke hoʻonui i ka nui o ka paʻa ʻana o ka wai o ka mortar, a hiki ke hoʻomaikaʻi i ka paʻa ʻana o ka wai o ka mortar me kahi ʻano lahilahi, akā inā ʻoi aku ka nui o ka ʻike ma mua o 0.6%, ʻaʻole nui ka piʻi ʻana o ka hopena paʻa wai; ʻO ka maʻiʻo a me ka viscosity nā mea e hoʻoholo ai i ka cellulose modified cement slurry. I ka hoʻohana ʻana i ka mortar cellulose ether i hoʻololi ʻia, pono e noʻonoʻo nui ʻia ka dosage a me ka viscosity.

Hua'ōlelo nui:cellulose ether; kaʻina hana; hoʻopaneʻe; paʻa wai

ʻO ka mortar kūkulu hale kekahi o nā mea kūkulu hale e pono ai no nā hana kūkulu. I kēia mau makahiki i hala iho nei, me ka hoʻohana nui ʻana i nā mea hoʻonaninani pā a me ka hoʻomaikaʻi ʻana i nā koi anti-crack a me nā anti-seepage no nā paia o waho, ua kau ʻia nā koi kiʻekiʻe no ka pale ʻana i ka māwae, ka hana hoʻopaʻa ʻana a me ka hana ʻana o ka mortar. Ma muli o nā hemahema o ka shrinkage maloʻo nui, ka impermeability maikaʻi ʻole, a me ka ikaika tensile haʻahaʻa haʻahaʻa, ʻaʻole hiki i ka mortar kuʻuna ke hoʻokō i nā koi kūkulu, a i ʻole nā ​​​​pilikia e like me ka hāʻule ʻana o nā mea hoʻonaninani. E like me ke kāpili ʻana i ka mortar, no ka mea, e emi koke ana ka wai o ka mortar, ua pōkole ka hoʻonohonoho ʻana a me ka manawa paʻakikī, a ʻo nā pilikia e like me ka haki ʻana a me ka hollowing e hiki mai ana i ka wā o ke kūkulu nui ʻana, e hoʻopilikia nui i ka maikaʻi o ka papahana. ʻO ka mortar maʻamau e nalowale ka wai me ka wikiwiki a ʻaʻole lawa ka hydration sima, ka hopena i kahi manawa wehe pōkole o ka mortar sima, ʻo ia ke kī e pili ana i ka hana o ka mortar.

ʻO ka cellulose ether ka maikaʻi o ka mānoanoa a me ka paʻa ʻana o ka wai, a ua hoʻohana nui ʻia i ke kahua o ka mortar, a ua lilo ia i mea hoʻohui pono e hoʻomaikaʻi ai i ka paʻa ʻana o ka wai o ka mortar a hāʻawi i ka hana kūkulu ʻana, e hōʻoluʻolu maikaʻi i ke kūkulu ʻana a ma hope o ka hoʻohana ʻana i ka mortar kuʻuna. . ʻO ka pilikia o ka lilo ʻana o ka wai ma ka waena. ʻO ka cellulose i hoʻohana ʻia i ka mortar maʻamau ka methyl cellulose ether (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose ether (HEMC), hydroxyethyl cellulose ether (HEC), etc. Ma waena o lākou, ʻo HPMC a me HEMC ka mea i hoʻohana nui ʻia.

Ke aʻo nui nei kēia pepa i ka hopena o ka cellulose ether ma ka hana (ka paʻa ʻana o ka wai, ka nalowale o ka wai a me ka manawa hoʻonohonoho), nā waiwai mechanical (ikaika compressive a me ka ikaika tensile bond), kānāwai hydration a me ka microstructure o ka paʻi sima. Hāʻawi ia i ke kākoʻo no nā waiwai o cellulose ether i hoʻololi ʻia i ka cement paste a hāʻawi i ka kuhikuhi no ka noi ʻana o ka cellulose ether modified mortar.

1. Hoao

1.1 Mea maka

Sima: Sima Portland maʻamau (PO 42.5) ka sima i hana ʻia e Wuhan Yadong Cement Company, me kahi ʻāpana kiko o 3500 cm²/g.

Cellulose ether: hydroxypropyl methylcellulose ether i kūʻai pāʻoihana (MC-5, MC-10, MC-20, viscosities o 50,000 Pa·S, 100000 Pa·S, 200000 Pa·S, kēlā me kēia).

1.2 Hana

Mechanical waiwai: I ke kaʻina hana o ka laʻana hoʻomākaukau, ka dosage o ka cellulose etera he 0.0% ~ 1.0% o ka sima nuipa, a me ka wai-kima laki mea 0.4. Ma mua o ka hoʻohui ʻana i ka wai a me ka hoʻoulu ʻana, e hui pū me ka cellulose ether a me ka sima. Ua hoʻohana ʻia kahi pāpaʻi sima me kahi laʻana o 40 x 40 x 40 no ka hoʻāʻo ʻana.

Ka manawa hoʻonohonoho: Hoʻokō ʻia ke ʻano ana e like me GB / T 1346-2001 "Cement Standard Consistency Water Consumption, Setting Time, Stability Test Method".

Ka mālama ʻana i ka wai: ʻO ka hoʻāʻo ʻana o ka mālama ʻana i ka wai o ka paʻi cement e pili ana i ka DIN 18555 maʻamau "Ke ala hoʻāʻo no ka mortar material cementitious inorganic".

Heat of hydration: Hoʻohana ka hoʻokolohua i ka TAM Air microcalorimeter o TA Instrument Company o ʻAmelika Hui Pū ʻIa, a ʻo ka ratio wai-cement he 0.5.

Hydration huahana: E hoʻoulu i ka wai a me ka cellulose etera me ka like, a laila hoʻomākaukau i ka slurry sima, hoʻomaka i ka manawa, lawe i nā laʻana i nā manawa manawa like ʻole, hoʻōki i ka hydration me ka ethanol piha no ka hoʻāʻo ʻana, a ʻo ka ratio wai-cement he 0.5.

2. Nā hopena a me ke kūkākūkā

2.1 Nā waiwai mīkini

Mai ka hopena o ka maʻiʻo cellulose ether i ka ikaika, hiki ke ʻike ʻia me ka hoʻonui ʻana o ka MC-10 cellulose ether content, nā ikaika o 3d, 7d a me 28d i emi iho; ʻO ka cellulose ether e hoʻemi nui i ka ikaika o 28d. Mai ka hopena o ka viscosity cellulose etera i ka ikaika, hiki ke ʻike ʻia inā he cellulose ether me ka viscosity o 50,000 a i ʻole 100,000 a i ʻole 200,000, e emi ana ka ikaika o 3d, 7d, a me 28d. Hiki ke ʻike ʻia ʻaʻohe hopena koʻikoʻi o ka cellulose ether Viscosity i ka ikaika.

2.2 Hoʻonohonoho manawa

Mai ka hopena o ka maʻiʻo o 100,000 viscosity cellulose ether i ka manawa hoʻonohonoho, hiki ke ʻike ʻia me ka hoʻonui ʻana o ka ʻike o MC-10, ʻo ka hoʻonohonoho mua ʻana a me ka hoʻonui ʻana i ka manawa hoʻonohonoho hope. Ke 1% ka maʻiʻo, ka manawa hoʻonohonoho mua Ua hiki i 510min, a hiki i ka manawa hoʻonohonoho hope i 850min. Ke hoʻohālikelike ʻia me ka blank, ua hoʻolōʻihi ʻia ka manawa hoʻonohonoho mua e 210min, a ua hoʻolōʻihi ʻia ka manawa hoʻonohonoho hope e 470min.

Mai ka mana o ka cellulose ether viscosity i ka hoʻonohonoho ʻana i ka manawa, hiki ke ʻike ʻia inā ʻo MC-5, MC-10 a i ʻole MC-20, hiki ke hoʻopaneʻe i ka hoʻonohonoho ʻana o ka sima, akā hoʻohālikelike ʻia me nā cellulose ethers ʻekolu, ka hoʻonohonoho mua. ka manawa a me ka hoʻonohonoho hope Hoʻolōʻihi ka manawa me ka piʻi ʻana o ka viscosity. ʻO kēia no ka mea hiki ke hoʻopili ʻia ka cellulose ether ma ka ʻili o nā ʻāpana sima, a laila e pale ai i ka wai mai ka hoʻopili ʻana me nā ʻāpana sima, a laila e hoʻopaneʻe ana i ka hydration sima. ʻO ka ʻoi aku ka nui o ka viscosity o cellulose ether, ʻoi aku ka mānoanoa o ka papa adsorption ma ka ʻili o nā ʻāpana sima, a ʻoi aku ka nui o ka hopena lohi.

2.3 Ka nui o ka mālama ʻana i ka wai

Mai ke kānāwai mana o ka cellulose ether maʻiʻo ma ka paʻa ʻana o ka wai, hiki ke ʻike ʻia me ka piʻi ʻana o ka maʻiʻo, piʻi ka nui o ka paʻa ʻana o ka wai o ka mortar, a ke ʻoi aku ka nui o ka cellulose ether ma mua o 0.6%, ʻoi aku ka nui o ka paʻa wai. paʻa i ka ʻāina. Eia naʻe, i ka hoʻohālikelike ʻana i nā eter cellulose ʻekolu, aia nā ʻokoʻa i ka mana o ka viscosity i ka pae paʻa wai. Ma lalo o ka like like, ʻo ka pilina ma waena o ka pae paʻa wai: MC-5≤MC-10≤MC-20.

2.4 Ka wela o ka hydration

Mai ka hopena o ka cellulose ether type a me ka maʻiʻo i ka wela o ka hydration, hiki ke ʻike ʻia me ka piʻi ʻana o ka maʻiʻo MC-10, e emi mālie ka wela exothermic o ka hydration, a ʻo ka manawa o ka hydration wela ke hoʻololi ʻia ma hope; He mana nui no hoi ka wela o ka wai. Me ka piʻi ʻana o ka viscosity, ua emi nui ka wela o ka hydration, a ua neʻe nui ka piko o ka mahana hydration ma hope. Hōʻike ia e hiki i ka cellulose ether ke hoʻopaneʻe i ka hydration cement, a ʻo kona hopena retarding e pili ana i ka ʻike a me ka viscosity o cellulose ether, i kūlike me ka hopena o ka hoʻonohonoho ʻana i ka manawa.

2.5 ʻIkepili o nā huahana hydration

Mai ka hōʻike SEM o ka huahana hydration 1d, hiki ke ʻike ʻia i ka wā i hoʻohui ʻia ai ka 0.2% MC-10 cellulose ether, hiki ke ʻike ʻia ka nui o ka clinker unhydrated a me ka ettringite me ka crystallization maikaʻi aʻe. %, ua emi loa ka ettringite crystals, e hōʻike ana i ka cellulose ether hiki ke hoʻopaneʻe i ka hydration o ka cement a me ka hoʻokumu ʻana o nā huahana hydration i ka manawa like. Ma ka hoʻohālikelike ʻana i nā ʻano cellulose ethers ʻekolu, hiki ke ʻike ʻia e hiki i ka MC-5 ke hana i ka crystallization o ka ettringite i loko o nā huahana hydration i ʻoi aku ka maʻamau, a ʻoi aku ka maʻamau o ka crystallization o ka ettringite. pili i ka mānoanoa o ka papa.

3. Ka hopena

a. ʻO ka hoʻohui ʻana i ka cellulose ether e hoʻopaneʻe i ka hydration o ka sima, e hoʻopaneʻe i ka paʻakikī a me ka hoʻonohonoho ʻana o ka sima, e hoʻemi i ka hoʻokuʻu ʻana o ka wela o ka hydration, a hoʻolōʻihi i ka manawa ʻike ʻia o ka wela wela. Me ka hoʻonui ʻana o ka dosage a me ka viscosity, e hoʻonui ka hopena retarding.

b. Hiki i ka cellulose ether ke hoʻonui i ka nui o ka paʻa ʻana o ka wai o ka mortar, a hiki ke hoʻomaikaʻi i ka paʻa ʻana o ka wai o ka mortar me ke ʻano ʻāpana lahilahi. ʻO kona paʻa wai e pili ana i ka dosage a me ka viscosity. Ke ʻoi aku ka nui o ka dosage ma mua o 0.6%, ʻaʻole piʻi nui ka hopena paʻa wai.