Mmekọrịta kemịkalụ n'etiti HPMC na ihe simenti

Hydroxypropyl methylcellulose (HPMC) bụ cellulose ether a na-ejikarị eme ihe n'ime ihe owuwu n'ihi ihe ndị pụrụ iche ya dị ka njide mmiri, ike na-egbuke egbuke, na adhesion. N'ime sistemu cimentious, HPMC na-eje ozi dị iche iche, gụnyere ịkwalite ikike ịrụ ọrụ, melite nrapado, na ịchịkwa usoro hydration.

Ihe simenti na-arụ ọrụ dị mkpa n'ịrụ ụlọ, na-enye ọkpụkpụ azụ azụ maka ngwa ngwa dị iche iche. N'ime afọ ndị na-adịbeghị anya, enweela mmasị na-eto eto n'ịgbanwe usoro cimentious iji mezuo ihe ndị chọrọ ịrụ ọrụ dị iche iche, dị ka ịrụ ọrụ nke ọma, ịdịte aka dị mma, na ibelata mmetụta gburugburu ebe obibi. Hydroxypropyl methylcellulose (HPMC) bụ otu n'ime ihe mgbakwunye a na-ejikarị eme ihe n'ụdị cementitious n'ihi njirimara ya na ndakọrịta na ciment.

1. Njirimara nke Hydroxypropyl Methylcellulose (HPMC)

HPMC bụ cellulose ether nke sitere na cellulose eke sitere na mgbanwe kemịkalụ. Ọ nwere ọtụtụ ihe a na-achọsi ike maka ngwa owuwu, gụnyere:

Njide mmiri: HPMC nwere ike ịmịnye ma na-ejigide mmiri buru ibu, nke na-enyere aka igbochi evaporation ngwa ngwa ma nọgide na-enwe ọnọdụ hydration kwesịrị ekwesị na sistemụ cimenti.

Ikike dị arọ: HPMC na-enye viscosity na ngwakọta cementitious, na-eme ka ọrụ ha dịkwuo mma ma na-ebelata nkewa na ọbara ọgbụgba.
Adhesion: HPMC na-eme ka adhesion nke cimentious ihe dị iche iche dị iche iche, na-eduga na mma nkekọ ike na anwụ ngwa ngwa.
Nkwụsi ike nke kemịkalụ: HPMC na-eguzogide mmebi kemịkalụ na gburugburu alkaline, na-eme ka ọ dabara adaba maka ojiji na sistemụ ciment.

2.Chemical Mmekọrịta n'etiti HPMC na Cementitious Materials

Mmekọrịta dị n'etiti HPMC na ihe cementitious na-eme n'ọtụtụ ọkwa, gụnyere mgbasa ozi anụ ahụ, mmeghachi omume kemịkalụ, na mgbanwe microstructural. Mmekọrịta ndị a na-emetụta kinetics hydration, mmepe microstructure, akụrụngwa akụrụngwa, na ịdịte aka nke ihe mejupụtara cementious.

3.Anụ ahụ Adsorption

Ngwakọta ụmụ irighiri HPMC nwere ike banye n'anụ ahụ n'elu akụkụ ciment site na njikọ hydrogen na ndị agha Van der Waals. Usoro mgbasa ozi a na-emetụta ihe ndị dị ka ebe dị n'elu na ụgwọ nke cement cement, yana ịdị arọ nke molecular na ntinye nke HPMC na ngwọta. Mgbasa ozi anụ ahụ nke HPMC na-enyere aka melite mgbasa nke akụkụ ciment na mmiri, na-eduga n'ịrụ ọrụ nke ọma na ibelata agụụ mmiri na ngwakọta cementious.

4.Chemical Reactions

HPMC nwere ike nweta mmeghachi omume kemịkalụ yana akụkụ nke ihe simenti, ọkachasị na ion calcium ewepụtara n'oge hydration nke ciment. Otu hydroxyl (-OH) dị na ụmụ irighiri ihe HPMC nwere ike imeghachi omume na ion calcium (Ca2+) iji mepụta ogige calcium, nke nwere ike inye aka na nhazi na ike siri ike nke usoro cimenti. Na mgbakwunye, HPMC nwere ike iso ngwaahịa hydration ciment ndị ọzọ na-emekọrịta ihe, dị ka calcium silicate hydrates (CSH), site na njikọ hydrogen na usoro mgbanwe ion, na-emetụta microstructure na nrụ ọrụ nke mado ciment siri ike.

5.Microstructural Modifications

Ọnụnọ nke HPMC na sistemu cementitious nwere ike ịkpata mgbanwe microstructural, gụnyere mgbanwe n'ụdị pore, nkesa nha pore, na ngwaahịa hydration morphology. Ngwakọta ụmụ irighiri HPMC na-arụ ọrụ dị ka ihe ndochi pore na saịtị nucleation maka ngwaahịa hydration, na-eduga na microstructures denser nwere pores dị mma yana nkesa otu ngwaahịa hydration. Mgbanwe microstructural ndị a na-enye aka n'ịkwalite akụrụngwa arụ ọrụ, dị ka ike mkpakọ, ike mgbanwe, na ịdịte aka, nke ihe simenti megharịrị HPMC.

6.Effects na Properties na Performance

Mmekọrịta kemịkalụ n'etiti HPMC na ihe simenti nwere mmetụta dị ukwuu na njirimara na arụmọrụ nke ngwaahịa sitere na ciment. Mmetụta ndị a gụnyere:

7. Mmelite ọrụ

HPMC na-akwalite arụmọrụ nke ngwakọta cimentious site na

ibelata agụụ mmiri, na-eme ka njikọta ọnụ dịkwuo elu, na ịchịkwa ọbara ọgbụgba na nkewa. The ndim na mmiri-ejigide Njirimara nke HPMC ekwe ka mma flowability na pumpability nke ihe mixes, ikwado ewu ọrụ na ọbọ chọrọ elu agwụ.

8.Control nke Hydration Kinetics

HPMC na-emetụta hydration kinetics nke sistemu cementitious site na ịhazi nnweta mmiri na ion, yana nucleation na uto nke ngwaahịa hydration. Ọnụnọ nke HPMC nwere ike ịla azụ ma ọ bụ mee ka usoro hydration dịkwuo ngwa dabere na ihe ndị dị ka ụdị, itinye uche, na ịdị arọ molecular nke HPMC, yana ọnọdụ ọgwụgwọ.

9.Mmelite nke Mechanical Properties

Ihe simenti megharịrị HPMC na-egosipụta ihe arụrụ arụ arụrụ arụ ma e jiri ya tụnyere sistemu gbadoro ụkwụ na ciment. Mgbanwe microstructural nke HPMC butere na-ebute ike mkpakọ dị elu, ike mgbanwe, na ike siri ike, yana nkwalite nguzogide mgbawa na nrụrụ n'okpuru ibu.

10.Nkwalite ịdịte aka

HPMC na-akwalite ịdịte aka nke ihe cimentious site na imeziwanye nguzogide ha na usoro mmebi dị iche iche, gụnyere okirikiri mmiri oyi, ọgụ kemịkalụ, na carbonation. Mkpirisi microstructure denser na mbelata permeability nke sistemu cementious megharịrị HPMC na-enye aka na-abawanye nguzogide nbata nke ihe na-emebi emebi yana ogologo ndụ ọrụ.

Hydroxypropyl methylcellulose (HPMC) na-arụ ọrụ dị mkpa n'ịgbanwe njirimara na arụmọrụ nke ihe cimenti site na mmekọrịta kemịkalụ na ihe ciment. Mgbasa ozi anụ ahụ, mmeghachi omume kemịkalụ, na mgbanwe microstructural nke HPMC butere na-emetụta arụmọrụ, kinetics hydration, akụrụngwa akụrụngwa, na ịdịte aka nke ngwaahịa dabere na ciment. Ịghọta mmekọrịta ndị a dị mkpa maka ịkwalite nhazi nke ihe simenti nke HPMC gbanwetụrụ maka ngwa ihe owuwu dị iche iche, sitere na kọmpụta nkịtị ruo ngwa ngwa pụrụ iche na grouts. Achọrọ nyocha ọzọ iji chọpụta usoro mgbagwoju anya na-ebute mmekọrịta dị n'etiti HPMC na ihe simenti na ịmepụta ihe mgbakwunye HPMC dị elu nwere njirimara ahaziri maka mkpa ihe owuwu kpọmkwem.