Letsatsi la poso:30,Nov,2022

A. Moemeli oa ho fokotsa metsi

E 'ngoe ea litšebeliso tsa bohlokoa tsa sesebelisoa sa ho fokotsa metsi ke ho fokotsa tšebeliso ea metsi ea konkreite le ho ntlafatsa metsi a konkreite tlas'a boemo ba ho boloka karolelano ea sekontiri sa metsi e sa fetohe, e le ho finyella litlhoko tsa lipalangoang tsa konkreite le kaho. Metsoako e mengata e fokotsang metsi e na le litekanyetso tse ngata. Haeba tekanyo e tletseng e fetisitsoe, tekanyo ea ho fokotsa metsi e ke ke ea eketseha, 'me ho tsoa mali le ho arohana ho tla etsahala. Tekanyo e felletseng e amana le lisebelisoa tse tala tsa konkreite le karolo ea motsoako oa konkreite.

 

1. Naphthalene superplasticizer

Naphthalene superplasticizere ka aroloa ka lihlahisoa tse phahameng tsa mahloriso (Na2SO4 content <3%), lihlahisoa tsa mahloriso a mahareng (Na2SO4 content 3% ~ 10%) le lihlahisoa tse tlaase tsa mahloriso (Na2SO4 content> 10%) ho ea ka litaba tsa Na2SO4. Mefuta e fapaneng ea litekanyetso tsa naphthalene series water reducer: phofo ke 0.5 ~ 1.0% ea boima ba samente; Likahare tse tiileng tsa tharollo ka kakaretso ke 38% ~ 40%, chelete ea ho kopanya ke 1.5% ~ 2.5% ea boleng ba samente, 'me tekanyo ea ho fokotsa metsi ke 18% ~ 25%. Naphthalene series water reducer ha e tsoe moea, 'me e na le tšusumetso e fokolang nakong ea ho beha. E ka kopanngoa le sodium gluconate, tsoekere, hydroxycarboxylic acid le matsoai, citric acid le inorganic retarder, 'me ka tekanyo e loketseng ea ho kenya moea, tahlehelo ea ho theoha e ka laoloa ka katleho. The go tlhoka mesola ea low concentration naphthalene letoto la ho fokotsa metsi ke hore litaba tsa sodium sulfate li kholo. Ha mocheso o le ka tlase ho 15 ℃, sodium sulfate crystallization e etsahala.

 

2. Polycarboxylic acid superplasticizer

Asiti ea polycarboxylicse fokotsang metsi se nkoa e le moloko o mocha oa ho fokotsa metsi ka mokhoa o phahameng, 'me batho ba lula ba lebeletse hore e sireletsehe, e sebetse hantle le e feto-fetohe ho feta mokhoa o tloaelehileng oa ho fokotsa metsi oa naphthalene ha o sebelisoa. Melemo ea ts'ebetso ea mofuta oa polycarboxylic acid e fokotsang metsi e bonahala haholo ka: tekanyo e tlase (0.15% ~ 0.25% (litšila tse sokolohileng), sekhahla se phahameng sa phokotso ea metsi (ka kakaretso 25% ~ 35%), ho bolokoa hantle, ho honyela ho tlase, moea o itseng. khatello ea maikutlo, 'me ho na le alkaline e tlase haholo.

Leha ho le joalo, ka ts'ebetso,asiti ea polycarboxylicse fokotsang metsi se tla boela se tobane le mathata a mang, a kang: 1. Phello ea ho fokotsa metsi e itšetlehile ka thepa e tala le karolo ea motsoako oa konkreite, 'me e angoa haholo ke lehlabathe le majoe le boleng ba metsoako ea liminerale; 2. Liphello tsa ho fokotsa metsi le ho boloka ho theoha ho itšetlehile haholo ka tekanyo ea ho fokotsa metsi, 'me ho thata ho boloka ho theoha ka tekanyo e tlaase; 3. Tšebeliso ea konkreite e matla kapa e nang le matla a mangata e na le motsoako o mongata, o amehang ho sebelisoa ha metsi, 'me ho fetoha ho fokolang ha metsi ho ka baka phetoho e kholo ea ho theoha; 4. Ho na le bothata ba ho lumellana le mefuta e meng ea lisebelisoa tse fokotsang metsi le li-admixtures tse ling, kapa esita le ha ho na phello ea superposition; 5. Ka linako tse ling konkreite e na le metsi a mangata a tsoang mali, ho kenngoa ha moea ka matla, le li-bubble tse kholo le tse ngata; 6. Ka linako tse ling ho fetoha ha mocheso ho tla ama phello eaasiti ea polycarboxylicse fokotsang metsi.

Lintlha tse amang ho lumellana ha samente leasiti ea polycarboxylicmetsi a fokotsang metsi: 1. Karo-karolelano ea C3A / C4AF le C3S / C2S e eketseha, ho lumellana ho fokotseha, C3A ea eketseha, 'me tšebeliso ea metsi ea konkreite e eketseha. Ha litaba tsa eona li le kholo ho feta 8%, tahlehelo ea ho putlama ha konkreite e eketseha; 2. Likahare tse kholo haholo kapa tse nyane haholo tsa alkaline li tla ama tšebelisano ea tsona hampe; 3. Boleng bo bobe ba motsoako oa samente bo tla boela bo ama ho lumellana ha tse peli; 4. Mefuta e fapaneng ea gypsum; 5. Samente e phahameng ea mocheso e ka baka boemo bo potlakileng ha mocheso o feta 80 ℃; 6. Samente e ncha e na le thepa e matla ea motlakase le bokhoni bo matla ba ho monya se fokotsang metsi; 7. Sebaka se khethehileng sa samente.