He aha ka cellulose ether e hoʻohana ai?

Cellulose eterae hoʻolōʻihi i ka manawa hoʻonohonoho o ka paʻi sima a i ʻole ka ʻupena mortar, e hoʻopaneʻe i nā kinetics hydration cement, he mea maikaʻi ia e hoʻomaikaʻi i ka manawa hana o nā kumu kumu sima, hoʻomaikaʻi i ke kūpaʻa a me ka hāʻule ʻana o ka lepo ma hope o ka nalowale ʻana, akā hiki ke hoʻopaneʻe i ka holomua o ke kūkulu ʻana, ʻoi aku hoʻi i nā kūlana haʻahaʻa haʻahaʻa no ka hoʻohana ʻana i ka mortar a me ka pā.

ʻO ka maʻamau, ʻoi aku ka kiʻekiʻe o ka cellulose ether, ʻoi aku ka lōʻihi o ka manawa hoʻonohonoho o ka slurry sima a me ka mortar, a ʻoi aku ka maopopo o ka hoʻopaneʻe hydration dynamics. Hiki i ka cellulose ether ke hoʻopaneʻe i ka hydration o nā ʻāpana mineral clinker koʻikoʻi tricalcium aluminate (C3A) a me tricalcium silicate (C3S) i loko o ka sima, akā ʻaʻole like ka hopena i kā lākou hydration kinetics. ʻO ka cellulose ether ka mea e hoʻemi nui i ka hopena o ka C3S i ka pae wikiwiki, ʻoiai no ka ʻōnaehana C3A-Caso4, ʻo ia ka mea e hoʻolōʻihi i ka manawa induction.

ʻO nā hoʻokolohua hou aʻe i hōʻike ʻia e hiki i ka cellulose etera ke kāohi i ka hoʻoheheʻe ʻana o C3A a me C3S, hoʻopaneʻe i ka crystallization o ka hydrated calcium aluminate a me ka calcium hydroxide, a hoʻemi i ka nucleation a me ka ulu ʻana o ka CSH ma luna o ka ʻili o nā ʻāpana C3S, akā ua liʻiliʻi ka hopena ma nā kristal ettringite. Weyer et al. ʻike ʻia ʻo ke degere o ka hoʻololi ʻana iā DS ke kumu nui e pili ana i ka wai sima, a ʻo ka liʻiliʻi o ka DS, ʻoi aku ka maopopo o ka hydration lohi lohi. Ma ke ʻano o ka cellulose ether e hoʻopaneʻe i ka hydration cement.

Sliva et al. Ua manaʻoʻiʻo ua hoʻonui ka cellulose ether i ka viscosity o ka solution pore a keʻakeʻa i ka neʻe ʻana o ka ion, no laila e hoʻopaneʻe i ka hydration cement. Eia naʻe, Pourchez et al. ʻike ʻia ʻaʻole maopopo ka pilina ma waena o ka cellulose ether i ka hoʻokahe ʻana i ka cement hydration a me ka slurry viscosity. ʻO Schmitz et al. ua ʻike ʻia ʻaʻohe hopena o ka viscosity o cellulose ether i nā kinetics hydration o ka sima.

Ua ʻike pū ʻo Pourchez he paʻa loa ka cellulose ether ma lalo o nā kūlana alkaline a ʻaʻole hiki ke hoʻopili ʻia ka hoʻokahe ʻia ʻana o ka cement hydration i ka decomposition o.cellulose etera. ʻO Adsorption paha ke kumu maoli o ka cellulose ether e hoʻopaneʻe ai i ka hydration hydration, e hoʻopili ʻia ka nui o nā mea hoʻohui i nā ʻāpana sima a me nā huahana hydration. Pourchcz et al. ʻike ʻia ʻoi aku ka ikaika o ka adsorption o nā huahana hydration a me cellulose ether, ʻoi aku ka maopopo o ka lohi.

Manaʻo maʻamau ka hoʻopili ʻia ʻana o nā molekole cellulose ether ma nā huahana hydration a ʻaʻole loa e hoʻopili ʻia ma ka pae mineral mua o ka clinker.