Letsatsi la poso:9,Jan,2023

Lisebelisoa tsa metsi ke eng?

Lisebelisoa tsa metsi (tse kang Lignosulfonates) ke mofuta oa motsoako o kenyelletsoang konkreite nakong ea ho kopanya. Lisebelisoa tsa metsi li ka fokotsa metsi ka 12-30% ntle le ho senya ts'ebetso ea konkreite kapa matla a mochine oa konkreite (eo hangata re e hlalosang ka matla a ho hatella). Ho na le mantsoe a mang a ho fokotsa metsi, e leng Superplasticizers, plasticizers kapa high-range water reducers (HRWR).

Mefuta ea Metsoako e fokotsang metsi

Ho na le mefuta e mengata ea li-admixtures tse fokotsang metsi. Lik'hamphani tse hlahisang lihlahisoa li fana ka mabitso le lihlopha tse fapaneng ho lisebelisoa tsena tse kang metsi, li-densifiers, lithuso tsa ho sebetsa, joalo-joalo.

Ka kakaretso, re ka arola lisebelisoa tse fokotsang metsi ka mefuta e meraro ho latela sebopeho sa tsona sa lik'hemik'hale (joalo ka ho Lethathamo la 1):

lignosulfonates, hydroxycarboxylic acid, le hydroxylated polymers.

Lignin e tsoa hokae?

Lignin ke thepa e rarahaneng e emelang hoo e ka bang 20% ​​ea sebopeho sa lehong. Nakong ea ts'ebetso ea tlhahiso ea pampiri ea ho etsa pampiri ka lehong, joala bo litšila bo thehoa e le sehlahisoa se nang le motsoako o rarahaneng oa lintho, ho kenyelletsa lihlahisoa tsa ho bola ha lignin le cellulose, lihlahisoa tsa sulfone tsa lignin, lik'habohaedreite tse fapa-fapaneng (tsoekere) le mahala sulfurous acid kapa sulfate.

Ka mor'a moo, ho se nke lehlakore, pula le ho belisoa ho hlahisa mefuta e mengata ea lignosulfonates tsa bohloeki bo fapaneng le ho hlophisoa ho itšetlehile ka lintlha tse 'maloa, tse kang neutralizing alkali, mokhoa oa pulping o sebelisoang, tekanyo ea ho belisoa esita le mofuta le lilemo tsa lehong le sebelisoang e le. makhasi a fepa.

Lignosulfonates e le li-reducers tsa metsi ka Konkreite

Tekanyetso ea Lignosulfonate superplasticizer hangata ke karolo ea 0.25 lekholong, e ka fellang ka phokotso ea metsi ho fihla ho karolo ea 9 ho isa ho 12 lekholong ea samente (0.20-0.30%). Joalo ka ha e sebelisoa ka tekanyo e nepahetseng, matla a konkreite a ntlafalitsoe ka 15-20% ha a bapisoa le konkreite ea litšupiso. Matla a ile a eketseha ka liphesente tse 20 ho isa ho 30 ka mor'a matsatsi a 3, ka liphesente tse 15-20 ka mor'a matsatsi a 7, 'me ka chelete e tšoanang ka mor'a matsatsi a 28.

Ntle le ho fetola metsi, konkreite e ka phalla ka bolokolohi haholoanyane, e leng ho etsang hore ho be bonolo ho sebetsa ka eona (ke ho eketsa bokhoni ba ho sebetsa).

Ka ho sebelisa tonne e le 'ngoe ea phofo ea superplasticizer ea lignosulfonate sebakeng sa samente, u ka boloka lithane tse 30-40 tsa samente ha u ntse u boloka ho putlama ho tšoanang, matla le konkreite ea litšupiso.

Boemong bo tloaelehileng, konkreite e kopantsoeng le moemeli enoa e ka lieha mocheso o phahameng oa hydration ka lihora tse fetang tse hlano, nako ea ho qetela ea konkreite ka lihora tse fetang tse tharo, le nako ea ho beha konkreite lihora tse fetang tse tharo ha li bapisoa le konkreite ea litšupiso. Sena se molemo bakeng sa kaho ea lehlabula, lipalangoang tsa konkreite ea thepa, le konkreite e ngata.

Lignosulfonate superplasticizer e nang le micro-entraining e ka ntlafatsa ts'ebetso ea konkreite mabapi le ho se mele ha leqhoa.