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 ihe ngwakọta ahụ dịkwuo elu.
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'ịkwado nkesa mkpokọta otu na 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 arụrụ arụ ọrụ
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