Self-Compacting Concrete (SCC) ke theknoloji ea morao-rao ea konkreite e phallang ka tlas'a boima ba eona ho tlatsa foromo ntle le tlhokahalo ea ho sisinyeha ha mechine. Melemo ea eona e kenyelletsa ts'ebetso e ntlafalitsoeng, litšenyehelo tse fokotsehileng tsa basebetsi, le ts'ebetso e ntlafalitsoeng ea sebopeho. Ho finyella litšobotsi tsena ho hloka taolo e nepahetseng ea motsoako, hangata ka thuso ea metsoako e kang Hydroxypropyl Methylcellulose (HPMC). Polymer ena ea cellulose ether e bapala karolo ea bohlokoa ho fetoleng thepa ea rheological ea SCC, ho ntlafatsa botsitso ba eona le litšobotsi tsa phallo.
Thepa le Mesebetsi ea HPMC
Hydroxypropyl Methylcellulose (HPMC) ke polima e se nang ionic, e qhibilihang ka metsing e tsoang ho selulose. Lintho tsa eona tsa bohlokoa li kenyelletsa:
Phetoho ea Viscosity: HPMC e eketsa viscosity ea litharollo tse nang le metsi, e ntlafatsa mofuta oa thixotropic oa motsoako oa konkreite.
Poloko ea Metsi: E na le bokhoni bo botle ba ho boloka metsi, bo thusang ho boloka ts'ebetso ea konkreite ka ho fokotsa mouoane oa metsi.
Ho khomarela le Khomahano: HPMC e ntlafatsa maqhama pakeng tsa mekhahlelo e fapaneng ea konkreite, e ntlafatsa thepa ea eona e momahaneng.
Ntlafatso ea Botsitso: E tsitsisa ho emisoa ha li-aggregates ho motsoako, ho fokotsa ho arohana le ho tsoa mali.
Thepa ena e etsa hore HPMC e be tlatsetso ea bohlokoa ho SCC, kaha e sebetsana le liphephetso tse tloaelehileng joalo ka karohano, ho tsoa mali, le ho boloka phallo e lakatsehang ntle le ho senya botsitso.
Karolo ea HPMC ho Konkreite e Ikopanyang
1. Ntlafatso ea Tšebeliso ea Mosebetsi
Mosebetsi oa mantlha oa HPMC ho SCC ke ho ntlafatsa ts'ebetso ea eona ka ho eketsa viscosity ea motsoako. Phetoho ena e lumella SCC ho phalla habonolo tlas'a boima ba eona, ho tlatsa foromo e rarahaneng le ho finyella tekanyo e phahameng ea compaction ntle le tlhokahalo ea ho sisinyeha. HPMC e netefatsa hore konkreite e lula e sebetsa ka nako e telele, e leng molemo haholo bakeng sa ho tšela ho hoholo kapa ho rarahaneng.
Flowability: HPMC e kenya letsoho ho thepa ea motsoako oa thixotropic, e lumellang hore e lule e le metsi ha e kopane empa e teteaneng ha e eme. Boitšoaro bona bo tšehetsa litšoaneleho tsa SCC tsa ho ikemela, ho netefatsa hore e phalla hantle ho tlatsa hlobo le ho kenya mekoallo e matlafatsang ntle le karohano.
Ho lumellana: Ka ho laola li-viscosity, HPMC e thusa ho boloka mokhoa o ts'oanang o ts'oanang ho pholletsa le motsoako, ho netefatsa hore sehlopha ka seng sa SCC se bontša ts'ebetso e tsitsitseng mabapi le phallo le botsitso.
2. Karohano le Taolo ea Mali
Karohano (karohano ea li-aggregates ho tloha penteng ea samente) le ho tsoa mali (metsi a nyolohelang holimo) ke mathata a bohlokoa ho SCC. Liketsahalo tsena li ka senya botšepehi ba sebopeho le qetello ea holim'a konkreite.
Homogeneous Mix: Bokhoni ba HPMC ba ho eketsa viscosity ea sekontiri sa samente bo fokotsa motsamao oa metsi le li-aggregates, ka hona ho fokotsa kotsi ea karohano.
Ho Fokotsa ho Tsoa ha Mali: Ka ho boloka metsi ka har'a motsoako, HPMC e thusa ho thibela mali a tsoang. Ho boloka metsi ho boetse ho tiisa hore ts'ebetso ea hydration e tsoela pele ka katleho, ho ntlafatsa ntlafatso ea matla le ho tšoarella ha konkreite.
3. Ntlafatso ea Botsitso
HPMC e tlatsetsa botsitsong ba SCC ka ho ntlafatsa momahano pakeng tsa likaroloana tsa motsoako. Botsitso bona bo matlafalitsoeng bo bohlokoa bakeng sa ho boloka kabo e ts'oanang ea li-aggregate le ho thibela ho thehoa ha likheo kapa matheba a fokolang.
Tšebelisano: Sebopeho sa sekhomaretsi sa HPMC se khothalletsa maqhama a molemo pakeng tsa likaroloana tsa samente le li-aggregates, e leng se etsang hore ho be le motsoako o momahaneng o hanyetsang karohano.
Ho tsitsisa: HPMC e tsitsisa microstructure ea konkreite, e lumella hore esita le ho ajoa ha lihlopha le ho thibela ho thehoa ha laitance (sebaka se fokolang sa samente le likaroloana tse ntle holim'a metsi).
Phello ho Mechanical Properties
1. Matla a Khatellang
Tšusumetso ea HPMC matleng a hatellang a SCC ka kakaretso e ntle. Ka ho thibela karohano le ho etsa bonnete ba motsoako o ts'oanang, HPMC e thusa ho boloka botšepehi ba microstructure ea konkreite, e lebisang ho litšobotsi tse ntle tsa matla.
Hydration: Ho boloka metsi ho matlafatsang ho tiisa hore ho na le hydration e feletseng ea likaroloana tsa samente, e leng se tlatsetsang ho nts'etsopele ea matrix a matla.
Uniform Density: Thibelo ea karohano e fella ka kabo e tšoanang ea li-aggregates, e tšehetsang matla a phahameng a khatello le ho fokotsa kotsi ea lintlha tse fokolang.
2. Ho tšoarella
Tšebeliso ea HPMC ho SCC e matlafatsa ts'ebetso ea eona ka ho etsa bonnete ba hore e na le microstructure e teteaneng le ho feta homogenous.
Phokotso ea Permeability: Momahano o ntlafetseng le ho fokotsa ho tsoa mali ho fokotsa ho phunyeletsa ha konkreite, ho matlafatsa khanyetso ea eona ho maemo a tikoloho joalo ka potoloho ea leqhoa, tlhaselo ea lik'hemik'hale le carbonation.
Qetello ea Bokaholimo bo Matlafalitsoeng: Thibelo ea ho tsoa mali le karohano e netefatsa pheletso e boreleli le e tšoarellang ea bokaholimo, e sa rateheng ho peperana le ho hola.
Maikutlo a Kopo le Tekanyetso
Katleho ea HPMC ho SCC e itšetlehile ka litekanyetso tsa eona le litlhoko tse khethehileng tsa motsoako. Litefiso tse tloaelehileng tsa litekanyetso li tloha ho 0.1% ho ea ho 0.5% ea boima ba samente, ho itšetlehile ka thepa e lakatsehang le litšobotsi tsa likarolo tse ling tsa motsoako.
Moralo oa Motsoako: Moralo o hlokolosi oa motsoako oa hlokahala ho ntlafatsa melemo ea HPMC. Lintlha tse joalo ka mofuta o kopaneng, litaba tsa samente, le metsoako e meng e tlameha ho nkuoa ho fihlela tekano e lakatsehang ea ho sebetsa, botsitso le matla.
Tšebelisano: HPMC e tlameha ho lumellana le metsoako e meng e sebelisoang motsoakong, joalo ka li-superplasticizers le li-reducers tsa metsi, ho qoba litšebelisano tse mpe tse ka senyang ts'ebetso ea SCC.
Hydroxypropyl Methylcellulose (HPMC) e bapala karolo ea bohlokoa ho ntlafatseng ts'ebetso ea Self-Compacting Concrete (SCC). Bokhoni ba eona ba ho fetola viscosity, ho ntlafatsa ho boloka metsi, le ho tsitsisa motsoako o rarolla mathata a bohlokoa tlhahiso ea SCC, ho kenyelletsa le ho arohana, ho tsoa mali le ho boloka phallo. Ho kenyelletsoa ha HPMC ho SCC ho fella ka motsoako oa konkreite o sebetsang haholoanyane, o tsitsitseng, le o tšoarellang, o e etsa tlatsetso ea bohlokoa bakeng sa lits'ebetso tsa sejoale-joale tsa konkreite. Tekanyo e nepahetseng le moralo oa motsoako li bohlokoa ho sebelisa melemo e felletseng ea HPMC, ho netefatsa hore SCC e fihlela litekanyetso tse ikhethileng tsa ts'ebetso tse hlokehang bakeng sa merero e fapaneng ea kaho.
Nako ea poso: Jun-18-2024