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What is the reason why polycarboxylate superplasticizer causes lagging bleeding of concrete?
Polycarboxylic acid superplasticizer is a water-soluble compound superplasticizer mainly composed of carboxylate grafted polymer, which can effectively improve various properties of concrete, improve the strength, anti-permeability, anti-carbonation, anti-shrinkage and durability of concrete. Leha ho le joalo, due to the influence of various factors, concrete mixed with polycarboxylic acid water reducer will often appear lag, bleeding and other phenomena, which will seriously affect the construction.
The main reasons are as follows:
(1) Excessive use of polycarboxylic acid water reducer
Polycarboxylic acid water-reducing agent can effectively improve concrete slump, empa palo ea ho kopanya e kholo haholo mme sekhahla sa phokotso ea metsi se phahame haholo (haufi le moedi wa ho kopanya, sekhahla sa phokotso ea metsi se feta 40%). Bokhoni ba ho hasana bo matla hoo bo tla fokotsa haholo momahano oa konkreite mme metsi a mangata a sa lefelloeng a lokolloe, kahoo e eketsa monyetla oa ho tsoa mali a konkreite. Haholo-holo ha batho ba sebelisa ho lokolloa butle le mofuta oa ho thella oa polycarboxylic acid e fokotsang metsi, ho kopanya haholo ho bonolo ho baka mali a konkreite a lag esita le ho baka karohano ha ho tebile. Ka hona, pele o sebelisoa, hoa hlokahala ho etsa tlhahlobo ea nako e tsoetseng pele ho bona phetoho ea boemo ba konkreite.
(2) polycarboxylic acid e fokotsang metsi e na le maikutlo a mocheso oa tikoloho mme e na le thepa ea ho tsoa butle
Ha ho bapisoa le lisebelisoa tse ling tse fokotsang metsi, thepa ea polycarboxylic acid e fokotsang metsi e ameha haholo ke mocheso. Lehlabuleng, ha mocheso o phahame, se fokotsang metsi sa polycarboxylic acid se nang le ts'ebetso e ntle ea ho putlama se kanna sa bonahala se le maemong a tlase “tšela haholo” ketsahalo ha mocheso o theoha ka tshohanyetso. Ka hona, ha mocheso o theoha ka tšohanyetso, polycarboxylic acid superplasticizer ea mantlha e lokela ho hlahlojoa pele e sebelisoa. Nakong ea tlhahiso, nako ea ho sisinyeha e lokela ho atolosoa ka nepo ho qhalakanya le ho lokolla polycarboxylic acid superplasticizer., e le ho qoba phello ea ho lokolloa butle nakong e tlang, se bakang ho baballa ha metsi a konkreite le pula ea metsi.
(3) Kenya polycarboxylic acid e fokotsang metsi ho lokisa ho putlama
Pele o tšela konkreite, ha ho fumanoa hore ho sebetsa ha motsoako oa konkreite ha ho finyelle litlhoko tsa kaho, ho sebetsa ha konkreite hangata ho lokisoa ka ho eketsa polycarboxylic acid superplasticizer ho motsoako oa konkreite. Leha ho le joalo, ha keketso ya bobedi e lokiswa, ka linako tse ling ho ke ke ha khoneha ho utloisisa hantle palo ea tšebeliso. Ha palo ea superplasticizer e feta tlhokahalo ea theory, superplasticizer e feteletseng e ntse e phetha karolo ka mor'a ho tšela konkreite, ho etsa bohareng ba tlhahlobo ea kabo ea metsi ka konkreite. Ka hona, ha u sebelisa superplasticizer ho lokisa ho sebetsa ha konkreite, konkreite e lokela ho kenngoa ka linako tse fapaneng ho ea ka bongata ba konkreite, 'me motsoako o lokela ho matlafatsoa ho netefatsa hore esita le ho kopanya le ho laoleha ho eketsa palo.
(4) Ha polycarboxylic acid superplasticizer e ne e kopanngoa, retarder e ne e sa sebelisoe hantle
Bakeng sa ho fumana ts'ebetso e ntle ea ts'ireletso ea ho putlama ha konkreite, palo e itseng ea likarolo tse fokotsang nako e atisa ho eketsoa ha sesebelisoa sa ho fokotsa metsi se kopantsoe. Ha palo ea karolo ea ho khutlisa e le kholo haholo, kapa ha mocheso o le motle empa motsoako oa polycarboxylic acid superplasticizer o kopana le ho fokotseha ha mocheso ka tšohanyetso, haholo-holo retang motsoako tla liehisa hydration ea samente le ho etsa hore mali a konkreite. Ka hona, o lokela ho ela hloko tšusumetso ea likarolo tsa metsi a sekhukhu a konkreite. Haholo-holo lekhalo le leholo la mocheso pakeng tsa motšehare le bosiu nakong ea selemo le ea hoetla, o lokela ho ela hloko haholoanyane palo ea retarder, e le hore ts'ebetsong ea ho beha konkreite, o ka thibela metsi ho phaphamala butle-butle, ho teba ka bongata, etsa hore konkreite e lag e tsoa mali.
(5) tumellano pakeng tsa samente le polycarboxylic acid e fokotsang metsi
Sebopeho sa konkreite se rarahane mme ho bonolo ho hlahisa liphetoho tsa lik'hemik'hale tse sa lumellaneng har'a likarolo. Haeba ho lumellana ha samente le polycarboxylic acid superplasticizer ho fokola, litaba tse tletseng tsa superplasticizer li tla eketseha, 'me superplasticizer e feteletseng e tla lelefatsa nako ea pele ea ho beha konkreite, 'me u etse hore metsi a mahala a konkreite a arohane. Holim'a moo, ha alkali e qhibilihang ka samenteng e le tlase, sekgahla sa hydration sa samente se ba butle, 'me ketsahalo ea ho tsoa mali ho sa feleng hangata e etsahala.
Holim'a moo, ts'ebetsong ea sebele ea tlhahiso ea konkreite, hangata batho ba kopana le ho feto-fetoha ha boleng ba lehlabathe, joalo ka seretse se ka tlase ho feta, bokahare ba metsi bo boholo kapa bo nyane, karohano e akaretsang, etc. Tsena tsohle li tla baka mali a konkreite kapa esita le karohano.
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