ʻO ka cellulose ether e hoʻopaneʻe i ka hydration o ka sima i nā degere like ʻole, i hōʻike ʻia i ka lohi ʻana i ka hoʻokumu ʻana o ka ettringite, CSH gel a me ka calcium hydroxide. I kēia manawa, ʻo ke ʻano o ka cellulose ether e hoʻopaneʻe nei i ka hydration cement ka mea nui i ka manaʻo o ka neʻe ʻana o ka ion, ka degradation alkali a me ka adsorption.
1. Ke kuhiakau o ka nee ana o ka ion
Ua manaʻo ʻia ʻo ka cellulose ethers e hoʻonui i ka viscosity o ka hoʻonā pore, ke keʻakeʻa nei i ka neʻe ʻana o ka ion, a laila e lohi ana i ka hydration cement. Eia naʻe, ma kēia hoʻokolohua, ʻoi aku ka ikaika o ka cellulose ether me ka viscosity haʻahaʻa e hoʻopaneʻe i ka hydration sima, no laila ʻaʻole paʻa kēia kuhiakau. ʻO ka ʻoiaʻiʻo, pōkole loa ka manawa no ka neʻe ʻana o ka ion a i ʻole ka neʻe ʻana, ʻaʻole hiki ke hoʻohālikelike ʻia me ka manawa o ka lohi ʻana o ka wai.
2. Hoʻohaʻahaʻa i ka alkaline
Hoʻohaʻahaʻa pinepine ʻia nā polysaccharides ma lalo o nā kūlana alkaline e hana i nā waikawa hydroxycarboxylic e hoʻopaneʻe i ka hoʻoheheʻe ʻana i ka sima. No laila, ʻo ke kumu o ka cellulose etera e hoʻopaneʻe ai i ka hydration cement, ʻo ia ka mea e hoʻohaʻahaʻa ai i ka slurry sima alkaline e hana ai i nā waikawa hydroxycarboxylic, akā ua ʻike ka haʻawina ʻo Cellulose ether ka paʻa loa ma lalo o nā kūlana alkaline, hoʻohaʻahaʻa wale ʻia, a ʻaʻohe hopena o nā huahana degraded. i ka lohi o ka hoʻoheheʻe ʻana i ka sima.
3. Adsorption
ʻO Adsorption paha ke kumu maoli e hoʻopaneʻe ai ka cellulose ether i ka hydration cement. Nui nā mea hoʻohui kūlohelohe e hoʻopili i nā ʻāpana sima a me nā huahana hydration, e pale ana i ka hoʻoheheʻe ʻana o nā ʻāpana sima a me ka crystallization o nā huahana hydration, a laila e lohi ana i ka hydration a me ka hoʻonohonoho ʻana o ka sima. Ua ʻike ʻia he maʻalahi ka hoʻopili ʻana o ka cellulose ether i ka calcium hydroxide, C. S． ʻO ka ʻili o nā huahana hydration e like me ka H gel a me ka calcium aluminate hydrate, akā ʻaʻole maʻalahi ka adsorbed e ettringite a me ka unhydrated phase. Eia kekahi, e pili ana i ka cellulose ether, ʻoi aku ka ikaika o ka adsorption o HEC ma mua o ka MC, a ʻo ka haʻahaʻa o ka hydroxyethyl ma HEC a i ʻole hydroxypropyl i HPMC, ʻoi aku ka ikaika o ka hiki adsorption: ma ke ʻano o nā huahana hydration, hydrogen. ʻO ka mana adsorption o ka calcium oxide C. S. ʻOi aku ka ikaika o ka hiki adsorption o H. Hōʻike hou ka nānā ʻana i ka hiki ʻana o ka adsorption o nā huahana hydration a me cellulose ether kahi pilina pili me ka lohi o ka hydration cement: ʻoi aku ka ikaika o ka adsorption, ʻoi aku ka maopopo o ka lohi, akā nāwaliwali ka adsorption o ka ettringite i cellulose ether, akā ʻo kona hoʻokumu ʻana. ua lohi loa. Ua hōʻike pū ʻia nā haʻawina ʻo ka cellulose ether kahi adsorption ikaika ma ka tricalcium silicate a me kāna mau huahana hydration, no laila ke hoʻopaneʻe nui nei i ka hydration o ka pae silicate, a he haʻahaʻa adsorption i ka ettringite, akā ua kaupalena ʻia ke kūkulu ʻana o ka ettringite. ʻIke ʻia ka lohi ʻana, ʻo ia ke kumu o ka lohi ʻana o ka ettringite i hoʻopili ʻia e ke koena Ca2+ i ka hopena, ʻo ia ka hoʻomau ʻana o ka hydration silicate lohi o cellulose ether.
Ma nā hopena hoʻāʻo, ʻoi aku ka ikaika o ka hiki ke hoʻopaneʻe o HEC ma mua o ka MC, a ʻoi aku ka ikaika o ka cellulose ether e hoʻopaneʻe i ka hoʻokumu ʻana o ka calcium hydroxide ma mua o ka C. S． He ikaika ka hiki o ka H gel a me ka ettringite, nona ka pilina pili me ka mana adsorption o cellulose ether a me nā huahana hydration cement. Ua hōʻoia hou ʻia ʻo adsorption ke kumu maoli ke kumu e hoʻopaneʻe ai ka cellulose etera i ka hydration cement, a ʻo ka cellulose ether a me nā huahana hydration cement i kahi pilina pili. ʻOi aku ka ikaika o ka adsorption o nā huahana hydration cement, ʻoi aku ka maopopo o ka hoʻokumu ʻana o nā huahana hydration lohi. Hōʻike nā hopena hōʻike mua i nā hopena like ʻole o ka cellulose ethers ma Portland cement hydration delay, a ʻo ka cellulose ether like me nā hopena lohi like ʻole i nā huahana hydration like ʻole, e hōʻike ana he hopena ʻokoʻa nā huahana hydration hydration Portland. ʻO ka adsorption o cellulose ether he mea koho, a ʻo ka adsorption o cellulose ether i nā huahana hydration cement e koho pū kekahi.
Ka manawa hoʻouna: Feb-27-2023