I-Self-Compacting Concrete (i-SCC) iteknoloji yekhonkrithi yanamhlanje ehamba phantsi kobunzima bayo ukuze igcwalise i-formwork ngaphandle kwesidingo sokungcangcazela komatshini. Izibonelelo zayo zibandakanya ukuphuculwa kokusebenza, ukuncitshiswa kweendleko zabasebenzi, kunye nokusebenza okuphuculweyo kolwakhiwo. Ukufezekisa ezi mpawu kufuna ulawulo oluchanekileyo lomxube, rhoqo ngoncedo lwe-admixtures efana ne-Hydroxypropyl Methylcellulose (HPMC). Le polymer ye-cellulose ether idlala indima ebalulekileyo ekuguquleni iimpawu ze-rheological ze-SCC, ukuphucula ukuzinza kwayo kunye neempawu zokuhamba.
Iipropati kunye nemisebenzi ye-HPMC
IHydroxypropyl Methylcellulose (HPMC) yi-non-ionic, i-polymer enyibilikayo emanzini ephuma kwi-cellulose. Iimpawu zayo eziphambili ziquka:
Ukuguqulwa kwe-Viscosity: I-HPMC ikwandisa i-viscosity yezisombululo zamanzi, ukuphucula ubume bethixotropic bomxube wekhonkrithi.
Ukugcinwa kwamanzi: Inezakhono ezigqwesileyo zokugcina amanzi, ezinceda ukugcina ukusebenza kwekhonkrithi ngokunciphisa ukuphuphuma kwamanzi.
Ukubambelela kunye nokuBambana: I-HPMC iphucula ukudibanisa phakathi kwezigaba ezahlukeneyo kwikhonkrithi, iphucula iimpawu zayo ezidibeneyo.
Ukuphuculwa kozinzo: Uzinzisa ukumiswa kwee-aggregates kumxube, ukunciphisa ulwahlulo kunye nokuphuma kwegazi.
Ezi zakhiwo zenza i-HPMC ibe yinto exabisekileyo yokongeza kwi-SCC, njengoko ijongana nemingeni eqhelekileyo efana nokwahlula, ukopha, kunye nokugcina ukuhamba okufunwayo ngaphandle kokubeka esichengeni uzinzo.
Indima ye-HPMC kwi-self-Compacting Concrete
1. Ukuphuculwa kokuSebenza
Umsebenzi ophambili we-HPMC kwi-SCC kukuphucula ukusebenza kwayo ngokwandisa i-viscosity yomxube. Olu hlengahlengiso luvumela i-SCC ukuba ihambe ngokulula phantsi kobunzima bayo, igcwalise ifom entsonkothileyo kwaye ifezekise iqondo eliphezulu lokuxinana ngaphandle kwesidingo sokungcangcazela. I-HPMC iqinisekisa ukuba ikhonkrithi ihlala isebenza ixesha elide, nto leyo eluncedo kakhulu ekugaleleni okukhulu okanye okuntsokothileyo.
Ukuqukuqela: I-HPMC inegalelo kumxube weempawu zethixotropic, ziwuvumela ukuba uhlale ulwelo xa uxutywe kodwa ujiye xa ume. Oku kuziphatha kuxhasa iimpawu zokuzilinganisa ze-SCC, ziqinisekisa ukuba zihamba kakuhle ukuze zizalise iimbumba kwaye zifake imivalo yokuqinisa ngaphandle kokwahlula.
Ukuhambelana: Ngokulawula i-viscosity, i-HPMC inceda ukugcina ukuhambelana okufanayo kulo lonke umxube, ukuqinisekisa ukuba ibhetshi nganye ye-SCC ibonisa ukusebenza okuhambelanayo ngokuhambelana nokuhamba nokuzinza.
2. Ukwahlula kunye nokuLawula ukopha
Ukwahlula (ukwahlulwa kwee-aggregates kwi-samente paste) kunye nokuphuma kwegazi (amanzi akhuphukela phezulu) yinkxalabo ebalulekileyo kwi-SCC. Ezi ziganeko zinokuphazamisa ukunyaniseka kwesakhiwo kunye nokugqitywa komphezulu wekhonkrithi.
Imixube ene-Homogeneous: Ukukwazi kwe-HPMC ukunyusa i-viscosity ye-cement paste kunciphisa ukuhamba kwamanzi kunye ne-aggregates, ngaloo ndlela kuncitshiswe umngcipheko wokwahlula.
Ukopha okwehlisiwe: Ngokugcina amanzi ngaphakathi komxube, i-HPMC inceda ukuthintela ukopha. Oku kugcinwa kwamanzi kwakhona kuqinisekisa ukuba inkqubo ye-hydration iyaqhubeka ngokufanelekileyo, iphucula ukuphuhliswa kwamandla kunye nokuqina kwekhonkrithi.
3. Uzinzo olongezelelweyo
I-HPMC inegalelo ekuzinzeni kwe-SCC ngokuphucula ukudibanisa phakathi kwamaqhekeza kumxube. Olu zinzo olongeziweyo lubalulekile ekugcineni ulwabiwo olufanayo lweeaggregates kunye nokuthintela ukwakheka kwe-voids okanye amabala abuthathaka.
Ukubambisana: Ubume bokubambelela be-HPMC bukhuthaza ukudibanisa okungcono phakathi kweengqungquthela zesamente kunye neengqungquthela, okubangelwa umxube odibeneyo ochasayo ukuhlukana.
Ukuzinzisa: I-HPMC izinzisa i-microstructure yekhonkrithi, ivumela ukusabalalisa ngokulinganayo i-aggregates kunye nokuthintela ukubunjwa kwe-laitance (i-laitance ebuthakathaka ye-samente kunye neengqungquthela ezintle phezu komhlaba).
Impembelelo kwiiPropati zoomatshini
1. Amandla acinezelayo
Impembelelo ye-HPMC kumandla ocinezelo we-SCC ilungile. Ngokunqanda ulwahlulo kunye nokuqinisekisa umxube we-homogeneous, i-HPMC inceda ukugcina ingqibelelo ye-microstructure yekhonkrithi, ekhokelela kwiimpawu zamandla ezingcono.
I-Hydration: Ukugcinwa kwamanzi okuphuculweyo kuqinisekisa ukugqithiswa okupheleleyo kwamasuntswana e-samente, okunegalelo kuphuhliso lwe-matrix enamandla.
Ubuninzi obufanayo: Ukuthintela ulwahlulo kubangela ukusabalalisa okufanayo kwee-aggregates, ezixhasa amandla aphezulu oxinzelelo kunye nokunciphisa umngcipheko wamanqaku abuthathaka.
2. Ukuqina
Ukusetyenziswa kwe-HPMC kwi-SCC kwandisa ukuqina kwayo ngokuqinisekisa i-microstructure exineneyo kunye ne-homogenous.
Ukuncitshiswa kwePermeability: Ukubambisana okuphuculweyo kunye nokunciphisa ukopha kunciphisa ukunyanzeliswa kwekhonkrithi, ukwandisa ukuchasana kwayo kwizinto ezisingqongileyo ezifana nemijikelo yokuqhaqha, ukuhlaselwa kweekhemikhali, kunye ne-carbonation.
Ukugqitywa kwe-Surface ephuculweyo: Ukuthintela ukopha kunye nokwahlula kuqinisekisa ukugqitywa kwendawo epholileyo kunye neyomelele ngakumbi, engaphantsi kokuphazamiseka kunye nokulinganisa.
Ukuqwalaselwa kokusetyenziswa kunye nomthamo
Ukusebenza kwe-HPMC kwi-SCC kuxhomekeke kwidosi kunye neemfuno ezithile zomxube. Amanqanaba okulinganisa okuqhelekileyo avela kwi-0.1% ukuya kwi-0.5% yesisindo se-samente, kuxhomekeke kwiipropati ezifunwayo kunye neempawu zamanye amacandelo kumxube.
Uyilo lomxube: Uyilo lomxube olululo luyimfuneko ukuze kunyuswe izibonelelo zeHPMC. Izinto ezinje nge-aggregate type, umxholo wesamente, kunye nezinye ii-admixtures kufuneka ziqwalaselwe ukufikelela kwibhalansi enqwenelekayo yokusebenza, uzinzo kunye namandla.
Ukuhambelana: I-HPMC kufuneka ihambelane nezinye ii-admixtures ezisetyenziselwa umxube, ezifana ne-superplasticizers kunye nezinciphisi zamanzi, ukuphepha ukusebenzisana okungalunganga okunokuphazamisa ukusebenza kwe-SCC.
IHydroxypropyl Methylcellulose (HPMC) idlala indima ebalulekileyo ekwandiseni ukusebenza kweSelf-Compacting Concrete (SCC). Ikhono layo lokuguqula i-viscosity, ukuphucula ukugcinwa kwamanzi, kunye nokuzinzisa umxube ojongene nemingeni ephambili kwimveliso ye-SCC, kubandakanywa ukuhlukana, ukuphuma kwegazi kunye nokugcina ukuhamba. Ukudityaniswa kwe-HPMC kwi-SCC kubangela umxube wekonkrithi osebenza ngakumbi, ozinzile, nohlala ixesha elide, nto leyo eyenza ukuba ibe sisongezo esixabisekileyo kwizicelo zekhonkrithi zale mihla. Idosi efanelekileyo kunye noyilo oluxutyiweyo luyimfuneko ukuze kusetyenziswe iinzuzo ezipheleleyo ze-HPMC, ukuqinisekisa ukuba i-SCC iyahlangabezana nemigaqo ethile yokusebenza efunekayo kwiiprojekthi ezahlukeneyo zokwakha.
Ixesha lokuposa: Jun-18-2024