Li-additives tsa Konkreite tse bobebe | Li-Agents tse Foaming tse Phahameng ka ho Fetisisa bakeng sa Konkreite ea Cellular
The 40% Permeability Drop U ka 'na ua iphapanyetsa
Mona ke palo e lokelang ho etsa hore u khaotse ho kopanya: a 0.05 phokotso ea karo-karolelano ea samente ea metsi e ka fokotsa matla a konkreite ka ho feta 40%. Seo ha se khopolo-taba. Eo ke capillary pore physics. Leha ho le joalo, re ntse re bona spec sheets moo metsi fokotsa admixture bakeng sa konkreite e nang le permeability e tlase e ts'oaroa joalo ka mohopolo o theko e tlaase.
Kaofela re bile teng. Teraka ea pompo e emetse. Basebetsi ba shebile. Semela sa batch se romela mojaro o shebahalang o le thata. Kahoo o eketsa metsi a mangata. Kapa hobe le ho feta, o tšela galone e eketsehileng ea superplasticizer ka tšepo ea hore e lokisa tsohle. Ema. Ke moo toro e mpe e qalang teng.
Ha re tsamaeeng har'a maraba a sebele a lefats'e. Ha ho fluff. Lithuto tseo u li sebelelitseng ka thata ho tloha lilemo tse mashome a mabeli tsa ho lokisa metsoako e mpe.
1. Hantle-ntle ke Motsoako o Fokotsang oa Metsi bakeng sa Konkreite e Felletseng ka Tlase?
Ka mantsoe a bonolo: ke k'hemik'hale e u lumellang fokotsa ho kopanya metsi ka 5% ho 30% ntle le ho etsa konkreite e sa sebetseng. Metsi a tlase a bolela karo-karolelano e tlase ea w/c. Low w/c e bolela li-capillari tse fokolang. Li-capillaries tse fokolang li bolela metsi, chloride, 'me sulfate ha e khone ho phunyeletsa.
Basebelisi ba bangata ba Reddit ba ngotse ka ho sebelisa se fokotsang metsi a mahareng leboteng la kamore e ka tlase mme ba ntse ba fumana mongobo.. Hobaneng? Ba sebelisitse mofuta o fosahetseng. Bakeng sa permeability e tlase ea 'nete, o hloka ho feta mofuta oa A o tloaelehileng feela. U hloka a hodimo-mochini o fokotsang metsi (Mofuta oa F kapa G) haeba u shebile w/c ka tlase 0.40.
2. Hobaneng ha Low w/c e le Habohlokoa Hakana?
Hobane permeability is not a linear function of w/c. At a w/c of 0.50, you have a highway of pores. Ho 0.35, those pores are mostly disconnected. The water reducing admixture for low permeability concrete is your tool to get there.
But here’s the trap: over-reduction. We’ve seen mixes with a w/c of 0.28 that had zero bleed water. That sounds great until the surface plastic shrinkage cracks open like a dry lake bed. You need some bleed to finish. Don’t chase a number. Chase a specification.
3. What Are the Types of Water Reducing Admixtures?
Pick the wrong one and you’ll either get no benefit or a set-time disaster. Here’s the breakdown:
| ASTM Type | Phokotso ea Metsi | Best For Low Permeability |
|---|---|---|
| A (Normal) | 5-10% | Only for minor improvements |
| F (High Range) | 12-25% | Excellent for w/c 0.35-0.40 |
| G (High Range, Retarding) | 12-25% | For hot weather or long hauls |
If you’re doing a water tank or a bridge deck exposed to deicing salts, we don’t recommend Type A. Go straight to Type F or G. The extra cost pays for itself in durability.
4. How Does It Affect Cement Hydration?
Here’s the technical part. Water reducers are surfactants. Bona disperse cement particles by breaking up agglomerations. This exposes more surface area for hydration. So you get higher early strength without adding cement.
But over-dosing is a real risk. We’ve seen a job where the ready-mix driver added an extra quart of superplasticizer on site. The concrete didn’t set for 18 lihora. The finishers walked off. The slab was a mess. Stick to the manufacturer’s dosage within +/- 10%. No more.
5. What’s the Optimal Dosage for Low Permeability?
There’s no one-size-fits-all number, but here’s a rule of thumb from field experience:
- Target: 0.38 ho 0.42 w/c ratio.
- Tekanyetso: Qala ho 4-6 oz per 100 lbs of cement for Type F. Adjust up to 10 oz max.
- Warning: Ka holimo 10 oz, you risk segregation and excessive retardation.
Always do a trial batch. The ‘floppy’ teko (visual slump) is not a test. Use a slump cone and measure exactly.
6. Are There Compatibility Issues with Other Admixtures?
Ee, ka botlalo. This is where many projects fail. You cannot just dump in an air-entraining agent and a water reducer and hope they play nice.
- Conflict: Some high-range water reducers can reduce air content by 1-2%. You’ll need to bump up the AEA dosage.
- Sequence: Add the water reducer first, then the air entrainer. Never mix them neat in the same tank.
- Retarder combo: If you use Type G, ha o hloke retarder e arohaneng. Ho lieha habeli ho senya nako ea ho qetela.
Rakonteraka e mong oa Reddit o hlalositse ho eketsa retarder ho motsoako oa Mofuta oa G bosiung bo batang. Konkreite e ne e ntse e le bonolo hoseng ho hlahlamang. Ba ile ba tlameha ho e tabola. Bala leqephe la lintlha tse tsamaisanang.
7. Lisebelisoa tsa 'Nete tsa Lefatše: Moo Motsoako Ena O Khanyang
Motsoako o fokotsang metsi bakeng sa konkreite e nang le matla a tlase ha se ntho ea boiketlo. Ke ntho e hlokahalang bakeng sa:
- Litanka tsa metsi le matamo: Ho dutla ha ho amohelehe.
- Likamore tse ka tlaase le marako a tlase-grade: Khatello ea Hydrostatic e fumana pore e 'ngoe le e' ngoe.
- Likamore tsa borokho: Ho kenella ha chloride ho tsoa matsoai a deicing ho baka ho bola ha rebar.
- Mehaho e pepeneneng ea sulfate: Limela tsa metsi a litšila, libaka tsa leoatle.
Boemong bo bong le bo bong, re bone motsoako o nepahetseng oa mochini o fokotsang metsi oa Mofuta oa F le samente e nang le alkali e tlase e hlahisa konkreite e nang le tekanyo e potlakileng ea chloride permeability ka tlase 1000 coulombs. Hoo ho tlase haholo’ ka ASTM C1202.
8. Ke Litšitiso life tseo U Lokelang ho li Sheba?
Ha re bue 'nete. Ha ho motsoako ke boselamose. Likotsi tsa sebele ke tsena:
- Ho fokotseha ho hoholo: Bolumo bo phahameng ba peista ea samente (ka baka la metsi a fokolang) e ka eketsa shrinkage ea ho omisa. Sebelisa motsoako o fokotsang shrinkage ha ho hlokahala.
- Ho seta nako ho fetoha: Mofuta oa F o potlakisa hanyane. Mofuta oa G o fokotsehile. Rera kemiso ea hau ea ho tšela ka nepo.
- Likotsi tsa ho noa ho feta tekano: Karohano, ho tsoa madi, crusting, le tahlehelo ea matla. Hlompha fensetere ea litekanyetso.
Re ne re e-na le mosebetsi moo konkreite e neng e le teng omme haholo bakeng sa ho qeta hobane se fokotsang metsi se ne se sebetsa ho feta tekano. Bahanyetsi ba ne ba tlameha ho sebelisa sesebelisoa sa ho qetela sa ho fafatsa. Seo se hloka chelete le nako.
9. U Etsa Teko Joang Haeba U Ha e le Hantle U Finyelletse Boikutlo bo Tlase?
U se ke ua nahana feela. Sebelisa liteko tsena tse tloaelehileng:
- Potlako e potlakileng ea Chloride (RCP) – ASTM C1202: Mehato kakaretso ea tefiso e fetile. Sepheo se ka tlase 1000 coulombs bakeng sa ho kenella ka tlase.
- Ho Monyeha ha Metsi – ASTM C642: Pontšo e ntle ea bophahamo ba pore.
- Sorptivity – ASTM C1585: E lekanya sekhahla sa ho monya ha metsi ka capillary suction.
Litlhahiso tse ngata joale li hloka liphetho tsa RCP pele li amohela motsoako. Haeba ha u so leke ea hau, o fofela sefofu.
10. Moshoelella: Fokotsa Samente, Eseng Tshebetso
Mona ke katleho e patiloeng. Ka mochini o fokotsang metsi a mangata, u ka khona fokotsa dikahare tsa samente ka 10-15% ha u ntse u boloka tekanyo e tšoanang ea w / c le matla. Seo se theola maoto a CO2 ntle le ho tela ho kenella ho tlase.
Re e entse mererong e mengata. Tlosa sebaka 100 li-lbs tsa samente e nang le se fokotsang metsi hantle. Matla a tšoanang. E tšoanang permeability. Theko e tlase. Konkreite e tala.
Keletso ea rona: Motsoako oo re o Tšepang
Ka mor'a ho hlahloba mefuta e mengata, re ntse re khutlela ho Xypex Admix C-1000 for critical low-permeability applications. It’s a blend of high-range water reducer and a crystalline waterproofing agent. It’s not just about reducing water-it’s about plugging the pores that remain.
Use it at 2% ka boima ba samente. Your rapid chloride permeability will drop below 500 coulombs. We’ve seen it on parking garages and water treatment plants.
Stop using generic naphthalene-based water reducers on critical structures. Upgrade your mix.
Click here to order Xypex Admix C-1000 now. Stock is limited. Don’t let another pour fail.
Mofani
ConcreteAndMore ke morekisi ea tšepahalang oa lefats'e ka bophara oa metsoako ea konkreite e sebetsang hantle haholo le lik'hemik'hale tsa kaho.. Ka lilemo tsa botsebi ba indasteri, Re sebetsa ka thata ho fana ka litharollo tse ncha tse kenyelletsang li-superplasticizers tsa polycarboxylate, likhoele tsa konkreite, defoamers, ho phophomang malwetse, le lihlahisoa tse tsoetseng pele tsa airgel thermal insulation. Haeba u thahasella motsoako oa konkreite, ka kopo ikutloe u lokolohile ho ikopanya le rona!