Self-Compacting Concrete (SCC) bụ teknụzụ ihe ọgbara ọhụrụ nke na-aga n'okpuru ibu nke ya iji mejupụta ụdị ọrụ na-enweghị mkpa maka ịma jijiji.Uru ya na-agụnye ịrụ ọrụ ka mma, mbelata ụgwọ ọrụ, yana nkwalite arụ ọrụ nhazi.Ị nweta njirimara ndị a chọrọ njikwa nke ọma nke ngwakọta, mgbe mgbe site na enyemaka nke admixtures dị ka Hydroxypropyl Methylcellulose (HPMC).Polymer cellulose ether a na-arụ ọrụ dị mkpa n'ịgbanwe njirimara rheological nke SCC, na-eme ka nkwụsi ike ya na njiri mara.
Njirimara na ọrụ nke HPMC
Hydroxypropyl Methylcellulose (HPMC) bụ polymer na-abụghị ionic, mmiri-soluble polymer sitere na cellulose.Njirimara ya gụnyere:
Mgbanwe nke viscosity: HPMC na-abawanye viscosity nke ngwọta mmiri, na-eme ka ọdịdị thixotropic nke ngwakọta ihe.
Njide mmiri: Ọ nwere ikike njigide mmiri dị mma, nke na-enyere aka ịnọgide na-arụ ọrụ nke ihe site na ibelata evaporation mmiri.
Adhesion na Cohesion: HPMC na-eme ka njikọ dị n'etiti usoro dị iche iche dị na kọmpụta, na-eme ka njirimara ya dịkwuo mma.
Nkwalite nkwụsi ike: Ọ na-eme ka nkwụsị nke nchịkọta dị na ngwakọta, na-ebelata nkewa na ọbara ọgbụgba.
Ngwongwo ndị a na-eme HPMC ka ọ bụrụ mgbakwunye bara uru na SCC, ebe ọ na-eleba anya n'ihe ịma aka ndị a na-ahụkarị dị ka nkewa, ọbara ọgbụgba, na idowe ike ịgba ọsọ achọrọ na-emebighị nkwụsi ike.
Ọrụ HPMC na Concrete na-emekọ onwe ya
1. Mmelite nke ịrụ ọrụ
Ọrụ bụ isi nke HPMC na SCC bụ ịkwalite arụmọrụ ya site n'ịbawanye viscosity ngwakọta.Mgbanwe a na-enye ohere ka SCC na-agba ọsọ ngwa ngwa n'okpuru ibu nke ya, na-ejuputa usoro dị mgbagwoju anya ma nweta ọkwa dị elu na-enweghị mkpa maka ịma jijiji.HPMC na-achọpụta na ihe ahụ na-anọgide na-arụ ọrụ ruo ogologo oge, nke bara uru karịsịa maka nnukwu ma ọ bụ mgbagwoju anya.
Flowability: HPMC na-enye aka na akụrụngwa thixotropic ngwakọta, na-enye ohere ka ọ nọgide na-enwe mmiri mmiri mgbe agwakọtara ya mana ọ na-eto eto n'elu.Omume a na-akwado njiri mara ọkwa onwe nke SCC, na-ahụ na ọ na-aga nke ọma iji mejuo ihe ebu ma na-eme ka mmanya na-ewusi ike na-enweghị nkewa.
Nkwekọrịta: Site n'ịchịkwa viscosity, HPMC na-enyere aka ịnọgide na-enwe otu n'otu n'otu oge niile, na-ahụ na ogbe SCC ọ bụla na-egosipụta arụmọrụ na-agbanwe agbanwe n'usoro nke ịgba na nkwụsi ike.
2. Nkewa na njikwa ọbara ọgbụgba
Nkewa (nkewa nke mkpokọta site na tapawa ciment) na ọbara ọgbụgba (mmiri na-ebili n'elu) bụ nchegbu dị mkpa na SCC.Ihe omume ndị a nwere ike imebi iguzosi ike n'ezi ihe na n'elu imecha ihe ahụ.
Ngwakọta jikọrọ ọnụ: Ike HPMC ịbawanye viscosity nke tapawa ciment na-ebelata mmegharị mmiri na mkpokọta, si otú ahụ belata ihe ize ndụ nke ikewapụ.
Mbelata ọbara ọgbụgba: Site na idowe mmiri n'ime ngwakọta, HPMC na-enyere aka igbochi ọbara ọgbụgba.Njide mmiri a na-emekwa ka usoro hydration na-aga n'ihu nke ọma, na-eme ka mmepe ike na ịdịte aka nke ihe ahụ dị.
3. Enwekwukwa Nkwụsi ike
HPMC na-enye aka na nkwụsi ike nke SCC site na imeziwanye njikọ n'etiti ihe ndị dị na ngwakọta.Nkwụsi ike a emelitere dị oke mkpa n'ịdokwa oke nkesa mkpokọta yana igbochi guzobe oghere ma ọ bụ ntụpọ adịghị ike.
Njikọta: Ụdị nrapado nke HPMC na-akwalite njikọ dị mma n'etiti cement particles na aggregates, na-eme ka ngwakọta na-ejikọta ọnụ nke na-emegide nkewa.
Nkwụsi ike: HPMC na-eme ka microstructure nke ihe ahụ dị ike, na-enye ohere maka ọbụna nkesa nchịkọta ma na-egbochi ịmepụta laitance (ihe na-adịghị ike nke ciment na ihe dị mma n'elu).
Mmetụta dị na akụrụngwa akụrụngwa
1. Ike Compressive
Mmetụta HPMC na ike mkpakọ nke SCC na-adịkarị mma.Site n'igbochi nkewa na ịhụ na a homogeneous mix, HPMC na-enyere aka ịnọgide na-eguzosi ike n'ezi ihe nke ihe si microstructure, na-eduga mma ike àgwà.
Hydration: Njide mmiri na-eme ka ọ dịkwuo mma na-eme ka hydration zuru oke nke akụkụ ciment, na-enye aka na mmepe nke matriks siri ike.
Njupụta Uniform: Mgbochi nke nkewa na-ebute nkesa otu nke mkpokọta, nke na-akwado ike mkpakọ dị elu ma na-ebelata ohere nke isi adịghị ike.
2. Ogologo oge
Ojiji nke HPMC na SCC na-eme ka ọ dị ogologo ndụ site n'ịhụ na microstructure dị denser na karịa.
Mbelata Permeability: Mmekọrịta dị mma na mbelata ọbara ọgbụgba na-ebelata ikike nke ihe ahụ, na-eme ka nguzogide ya na ihe ndị dị gburugburu ebe obibi dị ka ikuku na-ekpochapụ, ọgụ kemịkalụ, na carbonation.
Emechaala elu elu: Mgbochi nke ọbara ọgbụgba na nkewa na-eme ka ọ dị nro ma na-adịgide adịgide n'elu elu, bụ nke na-adịghị adịkarị mfe ịgbawa na ịcha.
Ngwa na Usoro onunu ogwu
Ịdị irè nke HPMC na SCC na-adabere na usoro ọgwụgwọ ya na ihe achọrọ nke ngwakọta ahụ.Ụdị usoro ọgwụgwọ a na-ahụkarị sitere na 0.1% ruo 0.5% nke ịdị arọ ciment, dabere na ihe ndị a chọrọ na njirimara nke ihe ndị ọzọ dị na ngwakọta.
Ngwakọta agwakọta: Nhazi ngwakọta kpachara anya dị mkpa iji bulie uru nke HPMC.A ghaghị ịtụle ihe ndị dị ka ụdị nchịkọta, ọdịnaya ciment, na ihe mgbakwunye ndị ọzọ iji nweta nguzozi achọrọ nke ịrụ ọrụ, nkwụsi ike, na ike.
ndakọrịta: HPMC ga-adabarịrị na admixtures ndị ọzọ ejiri na ngwakọta, dị ka superplasticizers na ndị na-ebelata mmiri, iji zere mmekọrịta ọjọọ nke nwere ike imebi arụmọrụ nke SCC.
Hydroxypropyl Methylcellulose (HPMC) na-arụ ọrụ dị mkpa n'ịkwalite arụmọrụ nke Concrete Self-Compacting (SCC).Ikike ya iji gbanwee viscosity, melite njide mmiri, na ịkwado ngwakọta ahụ na-ekwu maka ihe ịma aka ndị dị mkpa na mmepụta SCC, gụnyere nkewa, ọbara ọgbụgba, na ịnọgide na-enwe ike.Ntinye nke HPMC na SCC na-ebute ngwakọta kọmpụta na-arụ ọrụ, kwụsie ike na nke na-adịgide adịgide, na-eme ka ọ bụrụ ihe mgbakwunye bara uru maka ngwa ngwa ihe ọgbara ọhụrụ.Usoro ọgwụgwọ kwesịrị ekwesị na nhazi ngwakọta dị oké mkpa iji nweta uru zuru oke nke HPMC, na-ahụ na SCC na-emezu ụkpụrụ arụmọrụ akọwapụtara nke achọrọ maka ọrụ owuwu dị iche iche.
Oge nzipu: Jun-18-2024