5. Mathata ka tekanyo ea moemeli oa ho fokotsa metsi a polycarboxylate

Tekanyo ea ho fokotsa metsi ea polycarboxylate e tlase, sekhahla sa phokotso ea metsi se phahame, 'me ho putlama ho bolokoa hantle, empa mathata a latelang le ona a etsahala ts'ebetsong:

① Tekanyetso e hlokolosi haholo ha karo-karolelano ea metsi ho samente e le nyane, 'me e bonts'a sekhahla se phahameng sa phokotso ea metsi. Leha ho le joalo, ha karo-karolelano ea metsi ho ea samente e le khōlō (ka holimo ho 0,4), tekanyo ea ho fokotsa metsi le liphetoho tsa eona ha li totobetse, tse ka 'nang tsa amana le polycarboxylic acid. Mokhoa oa ts'ebetso oa moemeli oa ho fokotsa metsi a thehiloeng ho asiti o amana le phello ea eona ea ho hasana le ho boloka ka lebaka la phello ea steric e thibelang e entsoeng ke sebopeho sa limolek'hule. Ha karolelano ea metsi-binder e le khōlō, ho na le sebaka se lekaneng pakeng tsa limolek'hule tsa metsi tsamaisong ea ho hasana ea samente, kahoo sebaka se pakeng tsa limolek'hule tsa polycarboxylic acid The steric hindrance effect e nyane ka tlhaho.

② Ha palo ea thepa ea samente e le khōlō, tšusumetso ea tekanyo e bonahala haholoanyane. Tlas'a maemo a tšoanang, phello ea ho fokotsa metsi ha palo eohle ea lisebelisoa tsa cementitious e le <300kg / m3 e nyenyane ho feta tekanyo ea ho fokotsa metsi ha palo eohle ea lisebelisoa tsa cementitious> 400kg / m3. Ho feta moo, ha karo-karolelano ea samente ea metsi e le khōlō 'me palo ea thepa ea samente e nyenyane, ho tla ba le phello e phahameng.

Polycarboxylate superplasticizer e hlahisoa bakeng sa konkreite e sebetsang hantle, ka hona ts'ebetso ea eona le theko li loketse haholo konkreite e sebetsang hantle.

6. Mabapi le motsoako oa li-agent tse fokotsang metsi tsa polycarboxylic acid

Lisebelisoa tse fokotsang metsi a polycarboxylate li ke ke tsa kopanngoa le lisebelisoa tse fokotsang metsi tse thehiloeng ho naphthalene. Haeba lisebelisoa tse peli tse fokotsang metsi li sebelisoa thepa e le 'ngoe, li tla ba le tšusumetso haeba li sa hloekisoe hantle. Ka hona, hangata hoa hlokahala ho sebelisa sete e arohaneng ea lisebelisoa bakeng sa lisebelisoa tse fokotsang metsi tse thehiloeng ho polycarboxylic acid.

Ho latela maemo a hajoale a ts'ebeliso, ho lumellana ha motsoako oa ntho e kenang moeeng le polycarboxylate e ntle. Lebaka le ka sehloohong ke hore palo ea li-air-entraining agent e tlaase, 'me e ka "ts'oanela" le "polycarboxylic acid" e thehiloeng ho fokotsa metsi hore e lumellane le ho feta. , tlatsetso. Sodium gluconate ka har'a retarder le eona e na le tšebelisano e ntle, empa e na le kamano e fokolang le li-additives tse ling tsa letsoai 'me ho thata ho kopanya.

7. Mabapi le boleng ba PH ba polycarboxylic acid e fokotsang metsi

Theko ea pH ea li-agent tse fokotsang metsi tse thehiloeng ho polycarboxylic acid e tlase ho feta ea lisebelisoa tse ling tse fokotsang metsi tse sebetsang hantle haholo, tse ling tsa tsona ke 6-7 feela. Ka hona, li tlameha ho bolokoa ka har'a fiberglass, polasetiki le lijana tse ling, 'me li ke ke tsa bolokoa ka lijaneng tsa tšepe nako e telele. E tla etsa hore moemeli oa ho fokotsa metsi a polycarboxylate a senyehe, 'me ka mor'a ho senya nako e telele ea acid, e tla ama bophelo ba setshelo sa tšepe le polokeho ea polokelo le tsamaiso ea lipalangoang.