Nako ea ho beha konkreite ke parameter ea bohlokoa e amang boleng ba kaho le tsoelo-pele. Haeba nako ea ho beha e le telele haholo, e ka lebisa tsoelo-pele e liehang ea kaho le ho senya boleng bo thata ba konkreite; haeba nako ea ho beha e le khutšoanyane haholo, e ka lebisa mathateng kahong ea konkreite le ho ama phello ea kaho ea morero. E le ho lokisa nako ea ho beha konkreite, tšebeliso ea li-admixtures e fetohile mokhoa o tloaelehileng oa tlhahiso ea konkreite ea morao-rao.Hydroxyethyl Methyl Cellulose (HEMC), e le motsoako o tloaelehileng oa selulose o fetotsoeng, o sebelisoa haholo ka li-concrete admixtures 'me o ka ama rheology, ho boloka metsi, ho beha nako le thepa e meng ea konkreite.1. Lintho tsa motheo tsa HEMC
HEMC ke selulose e fetotsoeng, hangata e entsoeng ka selulose ea tlhaho ka ethylation le methylation reactions. E na le ho qhibiliha ha metsi hantle, ho teteaneng, ho boloka metsi le thepa ea gelling, kahoo e sebelisoa haholo kahong, ho roala, lik'hemik'hale tsa letsatsi le letsatsi le masimo a mang. Ka konkreite, HEMC e atisa ho sebelisoa e le motenya, moemeli oa ho boloka metsi le moemeli oa taolo ea rheology, e ka ntlafatsang ho sebetsa ha konkreite, ho eketsa ho khomarela le ho lelefatsa nako ea ho beha nako.
2. Phello ea HEMC nakong ea ho beha konkreite
Ho lieha ho beha nako
Joaloka motsoako oa selulose, HEMC e na le palo e kholo ea lihlopha tsa hydrophilic mohahong oa eona oa limolek'hule, tse ka sebelisanang le limolek'hule tsa metsi ho etsa li-hydrates tse tsitsitseng, kahoo li liehisa ts'ebetso ea samente ea hydration ho isa tekanyong e itseng. Tsela ea hydration ea samente ke mokhoa o ka sehloohong oa ho tiisa konkreite, 'me ho eketsoa ha HEMC ho ka ama nako ea ho beha ka litsela tse latelang:
Ntlafatso ea ho boloka metsi: HEMC e ka ntlafatsa haholo ho boloka metsi a konkreite, ea fokotsa sekhahla sa mouoane oa metsi, le ho lelefatsa nako ea karabelo ea samente ea hydration. Ka ho boloka metsi, HEMC e ka qoba tahlehelo e feteletseng ea metsi, kahoo e lieha ho etsahala ha boemo ba pele le ba ho qetela.
Ho fokotsa mocheso oa hydration: HEMC e ka thibela ho thulana le ho itšoara ha hydration ea likaroloana tsa samente ka ho eketsa viscosity ea konkreite le ho fokotsa lebelo la ho tsamaea ha likaroloana tsa samente. Sekhahla se tlase sa hydration se thusa ho lieha ho beha nako ea konkreite.
Phetoho ea Rheological: HEMC e ka fetola thepa ea rheological ea konkreite, ea eketsa viscosity ea eona, 'me ea boloka pente ea konkreite e le mokelikeli o motle qalong, ho qoba mathata a kaho a bakoang ke ho kopanya ho feteletseng.
Lintho tse susumetsang
Phello eaHEMCka nako e behiloeng ha e amane feela le litekanyetso tsa eona, empa hape e angoa ke lintlha tse ling tsa kantle:
Boima ba molek'hule le tekanyo ea ho fetola HEMC: Boima ba molek'hule le tekanyo ea ho fetola (tekanyo ea ho fetola ethyl le methyl) ea HEMC e na le tšusumetso e kholo mosebetsing oa eona. HEMC e nang le boima bo phahameng ba limolek'hule le tekanyo e phahameng ea ho fetola hangata e ka theha mohaho o matla oa marang-rang, o bontšang ho boloka metsi hantle le thepa e teteaneng, kahoo phello ea ho lieha ho beha nako e bohlokoa haholo.
Mofuta oa samente: Mefuta e sa tšoaneng ea samente e na le litekanyetso tse fapaneng tsa hydration, kahoo phello ea HEMC mekhoeng e fapaneng ea samente e boetse e fapane. Samente e tloaelehileng ea Portland e na le lebelo le potlakileng la ho phalla ha metsi, ha samente e 'ngoe ea mocheso o tlaase kapa samente e khethehileng e na le tekanyo e fokolang ea metsi,' me karolo ea HEMC tsamaisong ena e ka 'na ea hlahella haholoanyane.
Maemo a tikoloho: Maemo a tikoloho a kang mocheso le mongobo a na le tšusumetso ea bohlokoa nakong ea ho beha konkreite. Lithempereichara tse phahameng li tla potlakisa ts'ebetso ea hydration ea samente, e leng se etsang hore ho be le nako e khutšoanyane ea ho beha, 'me phello ea HEMC libakeng tse phahameng tsa mocheso e ka' na ea fokola. Ho e-na le hoo, libakeng tse tlaase tsa mocheso, phello ea ho lieha ha HEMC e ka ba e hlakileng haholoanyane.
Ho tsepamisa maikutlo ho HEMC: Boiketlo ba HEMC bo lekanya ka ho toba tekanyo ea tšusumetso ea eona holim'a konkreite. Likarolo tse phahameng tsa HEMC li ka eketsa haholo ho boloka metsi le rheology ea konkreite, ka hona ho lieha ho lieha nako ea ho beha, empa HEMC e feteletseng e ka 'na ea baka mokelikeli o futsanehileng oa konkreite le ho ama ts'ebetso ea kaho.
Phello ea Synergistic ea HEMC le li-admixtures tse ling
HEMC e atisa ho sebelisoa le li-admixtures tse ling (tse kang lisebelisoa tsa metsi, li-retarders, joalo-joalo) ho fetola ka ho feletseng ts'ebetso ea konkreite. Ka tšebelisano-'moho le ba fokotsang nako, phello ea tieho ea tlhophiso ea HEMC e ka ntlafatsoa le ho feta. Ka mohlala, phello ea synergistic ea li-retarders tse itseng tse kang phosphates le metsoako ea tsoekere e nang le HEMC e ka eketsa nako ea ho beha konkreite, e loketseng merero e khethehileng libakeng tse chesang kapa tse hlokang nako e telele ea kaho.
3. Liphello tse ling tsa HEMC ka thepa ea konkreite
Ntle le ho lieha nako ea ho beha, HEMC e boetse e na le phello ea bohlokoa linthong tse ling tsa konkreite. Ka mohlala, HEMC e ka ntlafatsa ho phalla ha metsi, ho hanyetsa karohano, ts'ebetso ea ho pompa le ho tšoarella ha konkreite. Ha u ntse u lokisa nako ea ho beha, liphello tse teteaneng le ho boloka metsi tsa HEMC li ka boela tsa thibela ka katleho ho arohana kapa ho tsoa mali ha konkreite, le ho ntlafatsa boleng ba kakaretso le botsitso ba konkreite.
Hydroxyethyl methylcellulose (HEMC) e ka lieha ka katleho nako ea ho beha konkreite ka ho boloka metsi a eona hantle, ho teteaneng le liphello tsa taolo ea rheological. Tekanyo ea tšusumetso ea HEMC e angoa ke lintlha tse kang boima ba limolek'hule, tekanyo ea ho fetola, mofuta oa samente, motsoako oa motsoako le maemo a tikoloho. Ka ho laola tekanyo le tekanyo ea HEMC ka mokhoa o utloahalang, nako ea ho beha nako e ka atolosoa ka katleho ha e ntse e netefatsa ts'ebetso ea kaho ea konkreite, 'me ho sebetsa le ho tšoarella ha konkreite ho ka ntlafatsoa. Leha ho le joalo, tšebeliso e feteletseng ea HEMC e ka boela ea tlisa liphello tse mpe, tse kang metsi a fokolang kapa a sa fellang, kahoo e lokela ho sebelisoa ka hloko ho latela litlhoko tsa sebele tsa boenjiniere.
Nako ea poso: Nov-21-2024