Kenyelletso ea Kaho ea Mariha ea Konkreite e Foamed

Lebaka leo ka lona motsoako oa konkreite ka har'a lisebelisoa tsa konkreite tse nang le foamed butle-butle li ka beha le ho thatafala ka mor'a ho tšela, ho fihlela matla a ho qetela a fumaneha, ke phello ea samente hydration. The speed of cement hydration is mainly related to the composition and proportion of the concrete itself, and mainly changes with the temperature.

When the temperature rises, hydration speeds up, and the strength increases faster; when the temperature drops to 0°C, part of the water in the concrete begins to freeze and gradually changes from liquid (metsi) to solid ( metsi). Ka nako ena, the water involved in the hydration of cement is reduced, so the hydration slows down and the strength increase is correspondingly slower. The temperature continues to drop, and when the water in the concrete completely turns into ice, ke hore, when it completely changes from the liquid phase to the solid phase, the hydration of the cement basically stops and the strength no longer increases.

After the water turns into ice, molumo o eketseha ka hoo e ka bang 9%, le ka nako e tšoanang le leqhoa katoloso khatello ea kelello ea ka 2500 kg/cm² e entsoe. Hangata boleng bona ba khatello bo boholo ho feta matla a pele a matla a entsoeng ka har'a lejoe la samente, ho etsa hore konkreite e senyehe ka maemo a fapaneng le ho fokotsa matla. Holim'a moo, ha metsi a fetoha leqhoa, e tla boela e hlahise likaroloana tse khōloanyane tsa leqhoa holim'a li-aggregate le litšepe tsa tšepe, ho fokolisa matla a tlamahano ea peista ea samente ka li-aggregate le litšepe, ka tsela eo e ama matla a hatellang a konkreite. Ha leqhoa le qhibiliha, li-voids tse fapaneng li tla thehoa ka har'a konkreite, e tla fokotsa ho kopana le ho tšoarella ha konkreite.

Ho ka bonoa hore ha ho hahoa boto ea konkreite e foamed nakong ea mariha, phetoho ea sebopeho sa metsi ke senotlolo sa kholo ea matla a konkreite. Litsebi tse ngata tsa malapeng le linaheng tse ling li entse palo e kholo ea lithuto tsa liteko ka mokhoa oa metsi ka konkreite. Liphetho li bonts'a hore konkreite e ncha e na le nako ea ho folisa pele ho leqhoa, e ka eketsang boemo ba mokelikeli o ka hare, fokotsa sekhahla se tiileng, le ho potlakisa hydration ea samente. Lipatlisiso tsa liteko li boetse li bontša hore nako e telele ea konkreite pele ho leqhoa, e nyane ho felloa ke matla.

Ka mor'a hore boto ea konkreite ea foamed e ntse e tsoela pele ho phekoloa ka mor'a ho qhibiliha, matla a lona a tla eketseha, empa boholo ba keketseho bo fapane. Bakeng sa nako e telele ea pele ho kalafo, konkreite e nang le matla a pele a holimo (ka mohlala, 35% ea R28) e fumanoang ka mora ho hoama, ho batla ho se tahlehelo ea matla hamorao. For the concrete with a short safety pre-curing period and a relatively low initial strength, after being frozen, the later strength will lose to varying degrees.

It can be seen that before the concrete freezes, it must have a pre-curing period at normal temperature to accelerate the hydration of the cement, so that the concrete obtains the lowest strength that does not suffer from freezing damage, generally called the critical strength, which can achieve the desired effect. Regarding the critical strength, the value varies from country to country. my country stipulates that it is not less than 30% of the design mark and not less than 35 kilograms per square centimeter.

Selection of winter construction method for foamed concrete insulation board 

From the above analysis, re ka tseba hore nakong ea kaho ea konkreite ea mariha, mathata a mararo a rarolloa haholo-holo: e 'ngoe ke mokhoa oa ho tseba nako e khuts'oane ea ho phekola ea konkreite, e 'ngoe ke mokhoa oa ho thibela tšenyo ea pele ea serame ea konkreite, 'me ea boraro ke mokhoa oa ho etsa bonnete ba hore matla a morao-rao le ho tšoarella ha konkreite li finyella litlhoko.

Morerong oa sebele, ho ya ka mocheso nakong ya kaho, boemo ba sebopeho sa boenjiniere (bongata ba mosebetsi, tekanyo ya sebopeho sa sebopeho le ponahatso), tekanyo ea ho potlaka ha nako ea kaho, mofuta le theko ea samente, moemeli oa pele oa matla, ntho e fokotsang, le antifreeze agent Khetha mokhoa o utloahalang oa ho haha ​​o itšetlehileng ka tshebetso le theko, tshebetso le theko ea thepa ea ho kenya letsoho, le maemo a mohloli oa mocheso.

Ka kakaretso, there can be several different winter construction plans for the same project. An ideal plan should use the shortest construction period and the lowest construction cost to obtain the best project quality, ke hore, the optimization of construction period, litšenyehelo, le boleng.

Four methods for construction of foamed concrete insulation board in winter:

1. Method of adjusting mix ratio   

Mainly suitable for the construction of foamed concrete insulation board at about 0℃.

specific methods:

①Choosing appropriate types of cement is an important means to improve the frost resistance of concrete. The test results show that early strength Portland cement should be used. The cement has a large heat of hydration and the highest strength in the early stage. Ka kakaretso, the compressive strength of 3 matsatsi a batla a lekana le matla a silika a tloaelehileng a samente bakeng sa 7 matsatsi, mme phello e hlakile.

② Fokotsa tekanyo ea samente ea metsi ka hohle kamoo ho ka khonehang 'me u eketse samente hanyenyane, ka hona ho eketsa mocheso oa hydration le ho khutsufatsa nako ea ho fihlela matla a lilemo.

③E kopantsoe le ntho e kenyang moea. Ha u ntse u boloka karolelano ea motsoako oa konkreite e sa fetohe, li-bubble tse hlahisoang ka mor'a ho kenyelletsa moemeli oa moea o kenyang moea o eketsa molumo oa seretse sa samente., ntlafatsa mokelikeli oa motsoako, ntlafatsa momahano oa eona le ho boloka metsi, le ho thibela metsi ka konkreite ho tloha ho leqhoa Khatello ea metsi e hlahisoang e ntlafatsa ho hanyetsa serame sa konkreite.

④ Eketsa li-admixtures tsa matla a pele ho khutsufatsa nako ea ho beha konkreite le ho ntlafatsa matla a pele..

⑤Khetha li-aggregates tse nang le boima bo phahameng ba likaroloana le likheo tse fokolang ho etsa hore motsoako oa katoloso ea mocheso o ts'oane le seretse se potolohileng.

2. Mokhoa oa ho boloka mocheso  

E sebelisoa haholo-holo bakeng sa merero moo mocheso o leng ka tlase ho hoo e ka bang 10 ℃ le sebopeho se batlang se le setenya.

Mokhoa ke: ho futhumatsa lisebelisoa tse tala (metsi, lehlabathe, lejoe), e le hore konkreite e be le mocheso o moholo ka mor'a ho kopanya, sepalangoang le ho tshela, e le hore hydration ea samente e futhumale kapele, 'me e matlafatsa ho koala ha konkreite. Netefatsa hore konkreite e ncha e khona ho mamella serame pele mocheso o theohela ho 0°C. Mokhoa ona o na le ts'ebetso e bonolo le litšenyehelo tse tlase tsa kaho, empa tlhokomelo e lokela ho lefshoa ho boloka mocheso ka hare, ho qoba serame sa dikgutlo le bokahodimo bo pepeneneng, le ho eketsa nako ea tlhokomelo.

3. Mokhoa oa ho futhumatsa ka ntle 

E sebelisoa haholo-holo bakeng sa merero moo mocheso o leng ka holimo ho 10 ℃ 'me likaroloana li se tse teteaneng. Ka ho futhumatsa moea o potolohileng likarolo tsa konkreite, mocheso o fetisetsoa ho konkreite, kapa konkreite e futhumetse ka ho toba, e le hore konkreite e ka thatafalloa ka tloaelo tlas'a maemo a matle a mocheso.

specific methods:

① Ho futhumatsa setofo. Ka kakaretso e sebelisoa libakeng tse nyane tsa kaho, mokhoa o bonolo, empa mocheso oa ka tlung ha o phahame, e batlang e omme, 'me carbon dioxide e lokolloa e tla carbonize holim'a konkreite e sa tsoa tšolloa ebe e ama boleng.

②Ho futhumatsa mouoane. Mouoane o sebelisoa ho thatafatsa konkreite maemong a chesang le a mongobo. Mokhoa ona o bonolo ho o laola mme mocheso oa ho futhumatsa o tšoana. Empa hobane e hloka lisebelisoa tse khethehileng tsa boiler, theko e batla e phahame. Ho feta moo, tahlehelo ea mocheso e kholo, mme maemo a tshebetso ha a matle.

③Ho futhumatsa motlakase. Ho sebelisa litšepe tsa tšepe e le li-electrode, kapa ho kenya heater ea motlakase holim'a konkreite, matla a motlakase a fetoha matla a mocheso ho eketsa mocheso oa konkreite. Mokhoa ona o bonolo ebile o bonolo, e na le tahlehelo e fokolang ea mocheso, ho bonolo ho laola, 'me e na le bofokoli ba tšebeliso e kholo ea matla.

④Ho futhumatsa ka infrared. Sebelisa licheso tsa motlakase tse nang le mocheso o phahameng kapa lijenereithara tsa infrared tsa khase ho futhumatsa konkreite ka mahlaseli a koetsoeng..

4. Motsoako oa antifreeze   

Mocheso o ka holimo ho 10℃, eketsa motsoako oa lik'hemik'hale o ka fokotsang ntlha ea leqhoa ea metsi ho motsoako oa konkreite, e le hore konkreite e ntse e le boemong ba mokelikeli mocheso o fosahetseng, le hydration ka tsoela pele ho etsa hore matla a konkreite Tsoela pele ho hōla. Hajoale, Ho na le hangata ho sebelisoa monoclonal antifreeze agents tse kang calcium oxide le sodium chloride le sodium nitrite le sodium chloride composite antifreeze agents..

Mekhoa e mene e ka holimo ea kaho ea mariha e na le melemo le melemo, mme sebaka sa bona sa kopo se thibetswe ke maemo a itseng. Ho ea ka maemo a teng a sebaka sa kaho, mokhoa oa ho haha ​​o le mong kapa tse peli kapa ho feta li lokela ho sebelisoa hammoho.

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