ʻO nā pilina kemika ma waena o HPMC a me nā mea sima

ʻO ka Hydroxypropyl methylcellulose (HPMC) he cellulose ether i hoʻohana nui ʻia i nā mea hana ma muli o kāna mau waiwai kūʻokoʻa e like me ka paʻa ʻana o ka wai, ka hiki ke mānoanoa, a me ka adhesion. Ma nā ʻōnaehana cementitious, lawelawe ʻo HPMC i nā kumu like ʻole, me ka hoʻomaikaʻi ʻana i ka hana, hoʻomaikaʻi i ka adhesion, a me ka mālama ʻana i ke kaʻina hana hydration.

He kuleana koʻikoʻi nā mea sima i ke kūkulu ʻana, e hāʻawi ana i ka iwi kuamoʻo no nā ʻano hana like ʻole. I nā makahiki i hala iho nei, ua ulu nui ka hoihoi i ka hoʻololi ʻana i nā ʻōnaehana cementitious e hoʻokō i nā koi o ka hana kikoʻī, e like me ka hoʻonui ʻana i ka hana, hoʻomaikaʻi i ka lōʻihi, a me ka hōʻemi ʻana i ka hopena o ke kaiapuni. ʻO ka Hydroxypropyl methylcellulose (HPMC) kekahi o nā mea hoʻohui maʻamau i hoʻohana ʻia i nā hoʻoheheʻe cementitious ma muli o kāna mau waiwai versatile a me ka launa pū me ka sima.

1. Nā Waiwai o Hydroxypropyl Methylcellulose (HPMC)

ʻO ka HPMC he cellulose ether i loaʻa mai ka cellulose kūlohelohe ma o ka hoʻololi kemika. Loaʻa iā ia nā waiwai i makemake ʻia no nā noi kūkulu, e like me:

Paʻa wai: Hiki i ka HPMC ke komo a mālama i ka nui o ka wai, e kōkua i ka pale ʻana i ka evaporation wikiwiki a mālama i nā kūlana hydration kūpono i nā ʻōnaehana cementitious.

Hiki ke mānoanoa: Hāʻawi ʻo HPMC i ka viscosity i nā hui cementitious, hoʻomaikaʻi i kā lākou hana a hōʻemi i ka hoʻokaʻawale ʻana a me ke koko.
Hoʻopili: Hoʻonui ka HPMC i ka hoʻopili ʻana o nā mea cementitious i nā substrate like ʻole, e alakaʻi ana i ka ikaika paʻa a me ka lōʻihi.
Paʻa kemika: He kūpaʻa ka HPMC i ka hoʻohaʻahaʻa kemika ma nā wahi alkaline, kūpono ia no ka hoʻohana ʻana i nā ʻōnaehana sima.

2. Nā Hana Kemika ma waena o ka HPMC a me nā mea hana sima

Loaʻa nā pilina ma waena o HPMC a me nā mea cementitious ma nā pae he nui, me ka adsorption kino, nā hopena kemika, a me nā hoʻololi microstructural. Hoʻopili kēia mau pilina i nā kinetics hydration, microstructure development, mechanical properties, a me ka lōʻihi o ka hopena cementitious composites.

3.Physical Adsorption

Hiki i nā molekala HPMC ke hoʻopili kino i ka ʻili o nā ʻāpana sima ma o ka hoʻopaʻa ʻana i ka hydrogen a me nā ikaika Van der Waals. Hoʻopili ʻia kēia kaʻina hana adsorption e nā mea e like me ka ʻili a me ka hoʻopiʻi ʻana o nā ʻāpana sima, a me ke kaumaha molekala a me ka neʻe ʻana o ka HPMC i ka hopena. ʻO ka adsorption kino o HPMC e kōkua i ka hoʻomaikaʻi ʻana i ka hoʻopuehu ʻana o nā ʻāpana sima i loko o ka wai, e alakaʻi ana i ka hoʻonui ʻana i ka hana a me ka hoʻemi ʻana i ka koi wai i nā hui cementitious.

4. Nā Hana Kemika

Hiki i ka HPMC ke hana i nā hopena kemika me nā ʻāpana o nā mea sima, ʻo ia hoʻi me nā ion calcium i hoʻokuʻu ʻia i ka wā o ka hydration o ka sima. Hiki i nā pūʻulu hydroxyl (-OH) i loaʻa i loko o nā molekala HPMC ke hana me nā ion calcium (Ca2+) e hana i nā paʻakikī calcium, hiki ke kōkua i ka hoʻonohonoho ʻana a me ka paʻakikī o nā ʻōnaehana cementitious. Eia hou, hiki i ka HPMC ke launa pū me nā huahana hoʻomaʻemaʻe sima ʻē aʻe, e like me ka calcium silicate hydrates (CSH), ma o ka hoʻopaʻa ʻana i ka hydrogen a me nā kaʻina hoʻololi ion, e hoʻohuli i ka microstructure a me nā waiwai mechanical o ka paʻi sima paʻa.

5.Microstructural Hoʻololi

Hiki i ka hele ʻana o HPMC i nā ʻōnaehana cementitious ke hoʻohuli i nā hoʻololi microstructural, me ka hoʻololi ʻana i ka hoʻolālā pore, ka hāʻawi ʻana i ka nui o ka pore, a me ka morphology huahana hydration. Hana nā molekala HPMC ma ke ʻano he pore fillers a me nā kahua nucleation no nā huahana hydration, e alakaʻi ana i nā microstructures denser me nā pores ʻoi aku ka maikaʻi a me ka hāʻawi like ʻana o nā huahana hydration. Hāʻawi kēia mau hoʻololi microstructural i ka hoʻomaikaʻi ʻana i nā waiwai mechanical, e like me ka ikaika compressive, ka ikaika flexural, a me ka lōʻihi, o nā mea cementitious hoʻololi HPMC.

6.Effects ma nā waiwai a me ka hana

He hopena koʻikoʻi ka pilina kemika ma waena o HPMC a me nā mea sima i nā waiwai a me ka hana o nā huahana sima. Aia kēia mau hopena:

7. Hoʻonui i ka hana

Hoʻomaikaʻi ʻo HPMC i ka hana ʻana o nā huila sima e

e ho'ēmi i ka koi wai, e hoʻonui i ka pilina, a me ka mālama ʻana i ke koko a me ka hoʻokaʻawale ʻana. ʻO ka mānoanoa a me ka paʻa wai o ka HPMC e ʻae ai i ka hiki ke kahe a me ka pumpability o ka hui ʻana o ke kaʻa, hoʻomaʻamaʻa i nā hana hana a hoʻokō i ka hoʻopau ʻana o ka ʻili.

8. Mana o Hydration Kinetics

Hoʻopili ka HPMC i nā kinetics hydration o nā ʻōnaehana cementitious ma ka hoʻoponopono ʻana i ka loaʻa o ka wai a me nā ion, a me ka nucleation a me ka ulu ʻana o nā huahana hydration. Hiki i ka hele ʻana o HPMC ke hoʻopaneʻe a hoʻolōʻihi paha i ke kaʻina hana hydration ma muli o nā kumu e like me ke ʻano, ka ʻike, a me ke kaumaha molekala o HPMC, a me nā kūlana hoʻōla.

9. Hoʻomaikaʻi i nā ʻano Mechanical

Hōʻike ʻia nā mea ʻenehana i hoʻololi ʻia e HPMC i nā waiwai mekini i hoʻohālikelike ʻia me nā ʻōnaehana sima maʻamau. ʻO nā hoʻololi microstructural i hoʻokomo ʻia e HPMC ka hopena o ka ikaika compressive kiʻekiʻe, ka ikaika flexural, a me ka paʻakikī, a me ka hoʻomaikaʻi ʻana i ke kūʻē ʻana i ka ʻāʻī a me ka deformation ma lalo o ka ukana.

10.Enhancement of Durability

Hoʻonui ka HPMC i ka lōʻihi o nā mea sima ma o ka hoʻomaikaʻi ʻana i ko lākou kūʻē ʻana i nā ʻano hana hoʻohaʻahaʻa like ʻole, e like me nā pōʻai manuahi, hoʻouka kemika, a me ka carbonation. ʻO ka microstructure denser a me ka emi ʻana o ka permeability o nā ʻōnaehana cementitious i hoʻololi ʻia e HPMC e kōkua i ka hoʻonui ʻana i ke kūʻē ʻana i ka komo ʻana o nā mea deleterious a me ka lōʻihi o ke ola lawelawe.

He kuleana koʻikoʻi ka Hydroxypropyl methylcellulose (HPMC) i ka hoʻololi ʻana i nā waiwai a me ka hana ʻana o nā mea cementitious ma o ka pilina kemika me nā ʻāpana sima. ʻO ka adsorption kino, nā hopena kemika, a me nā hoʻololi microstructural i hoʻoulu ʻia e HPMC e hoʻoikaika i ka hana, hydration kinetics, mechanical properties, a me ka lōʻihi o nā huahana i hoʻokumu ʻia i ka sima. He mea nui ka hoʻomaopopo ʻana i kēia mau pilina no ka hoʻopololei ʻana i ka hoʻokumu ʻana o HPMC-modified cementitious material no nā ʻano hana kūkulu ʻokoʻa, mai ka palaki maʻamau a hiki i nā morta kūikawā a me nā grouts. Pono ka noiʻi hou aʻe e ʻimi i nā mīkini paʻakikī e pili ana i ka pilina ma waena o ka HPMC a me nā mea sima a me ka hoʻomohala ʻana i nā mea hoʻohui HPMC kiʻekiʻe me nā waiwai i hoʻohālikelike ʻia no nā pono hana.