1. Lub luag haujlwm tseem ceeb thiab cov hom phiaj tseem ceeb hauv kev siv tshuab niaj hnub
1.1 Kev Ua Haujlwm thiab Mechanism ntawm Cov Khoom Uas Ua Npuas Ncauj Foaming
(Qhob foaming agent)
Concrete lathering agents yog cov tshuaj tshwj xeeb admixtures tsim los ua kom lub hom phiaj qhia thiab tswj xyuas qhov ntim ntawm huab cua npuas nyob rau hauv cov pob zeb tshiab matrix..
Cov neeg sawv cev no ua haujlwm los ntawm kev txo qis qhov nro ntawm cov dej sib tov, ua rau nws ua tau rau txoj kev loj hlob zoo, tusyees dispersed cua voids thoob plaws txhua yam agitation los yog blending.
Lub hom phiaj tseem ceeb yog tsim cellular pob zeb los yog lub teeb yuag pob zeb, qhov twg cov entrained cua npuas ho txo qhov dav dav dav ntawm cov khoom solidified thaum tswj kom txaus architectural stability.
Lathering agents feem ntau yog raws li cov protein-derived surfactants (xws li hydrolyzed keratin los ntawm tsiaj byproducts) los yog hluavtaws surfactants (muaj cov alkyl sulfonates, ethoxylated cawv, los yog fatty acid derivatives), txhua qhov muab cov npuas kev ruaj ntseg thiab ua npuas ncauj nta.
Cov tsim ua npuas ncauj yuav tsum ruaj khov txaus los tiv thaiv kev sib tov, twj, thiab thawj zaug teeb tsa yam tsis muaj kev sib koom ua ke loj lossis tawg, ua kom muaj homogeneous mobile moj khaum hauv cov khoom kawg.
Qhov no engineered porosity txhim kho thermal rwb thaiv tsev, minimizes tuag tons, thiab txhim khu kev tiv thaiv hluav taws, ua foamed qhob zoo tagnrho rau kev siv xws li insulating flooring screeds, gap kev kho hniav filling, thiab premade light-weight panels.
1.2 Lub Hom Phiaj thiab Qhov System ntawm Pob Zeb Defoamers
Qhov sib txawv, pob zeb defoamers (kuj hu ua anti-foaming cov neeg sawv cev) yog tsim los kom tshem tawm lossis txo cov huab cua uas tsis xav tau hauv qhov sib xyaw ua ke.
Thaum sib tov, kev thauj mus los, thiab positioning, huab cua tuaj yeem xaus rau qhov tsis tuaj yeem nkag mus rau hauv cov cement paste vim kev ntxhov siab, tshwj xeeb tshaj yog nyob rau hauv cov kua los yog nws tus kheej-consolidating pob zeb (SCC) tshuab nrog cov khoom siv superplasticizer.
Cov cua npuas no feem ntau tsis sib npaug hauv qhov ntev, phem tawg, thiab detrimental rau mechanical thiab aesthetic zog ntawm solidified pob zeb.
Defoamers ua hauj lwm los ntawm destabilizing huab cua npuas ntawm huab cua-kua interface, advertising coalescence thiab tsim kua muag ntawm slim kua tsos nyob ib ncig ntawm cov npuas.
( Qhob foaming agent)
Lawv feem ntau yog tsim los ntawm cov roj insoluble (xws li ntxhia los yog veggie roj), siloxane-raws li polymers (e.g., polydimethylsiloxane), los yog cov khoom uas zoo li hydrophobic silica, uas permeate cov yeeb yaj kiab npuas thiab ua kom cov dej ntws tawm sai thiab tawg.
Los ntawm kev txo qis cua cov ntsiab lus– feem ntau los ntawm cov teeb meem qib dhau 5% nqe 1– 2%– defoamers txhim kho compressive toughness, txhim khu nto txheej, thiab boost toughness los ntawm minimizing permeability thiab muaj peev xwm freeze-thaw vulnerability.
2. Chemical Composition thiab Interfacial Behavior
2.1 Molecular Architecture ntawm Foaming Professionals
Qhov kev ua tau zoo ntawm tus neeg sawv cev ntawm cov pob zeb ua pob zeb yog zoo sib xws rau nws cov qauv molecular thiab kev ua haujlwm ntawm lub ntsej muag.
Protein-based foaming cov neeg sawv cev nyob ntawm cov saw ntev polypeptides uas nthuav dav ntawm cov neeg siv huab cua-dej interface, tsim viscoelastic zaj duab xis uas sawv ntsug los tsim kua muag thiab muab cov khoom siv tawv tawv rau cov phab ntsa npuas.
Tag nrho cov natural surfactants tsim loj loj tab sis khov kho npuas nrog kev ua siab ntev., ua rau lawv zoo tagnrho rau cov qauv sib xyaw ua ke.
Synthetic frothing agents, ntawm qhov sib txawv, cuam tshuam zoo sib xws thiab tsis tshua muaj kev cuam tshuam rau cov kev hloov pauv hauv dej chemistry lossis qib kub.
Lawv tsim me me, Cov npuas ntau zoo sib xws vim lawv qhov txo qis hauv cheeb tsam nro thiab nrawm dua adsorption kinetics, ua rau cov txheej txheem zoo dua pore thiab txhim kho thermal kev ua haujlwm.
Qhov tseem ceeb micelle concentration (CMC) thiab hydrophilic-lipophilic tshuav nyiaj li cas (HLB) ntawm cov surfactant txheeb xyuas nws cov kev ua tau zoo hauv kev ua npuas dej thiab kev ruaj ntseg nyob rau hauv shear thiab cementitious alkalinity.
2.2 Molecular Architecture ntawm Defoamers
Defoamers ua haujlwm los ntawm cov cuab yeej sib txawv, cia siab rau immiscibility thiab interfacial tsis sib haum xeeb.
Silicone-based defoamers, tshwj xeeb tshaj yog polydimethylsiloxane (PDMS), muaj txiaj ntsig zoo vim lawv qhov tshwj xeeb txo qhov chaw nro (~ 20– 25 mN / m), uas tso cai rau lawv nthuav tawm sai sai thoob plaws thaj tsam ntawm huab cua npuas.
Thaum ib tug defoamer droplet hu rau ib tug npuas movie, nws tsim ib “tus choj” nyob nruab nrab ntawm ob qhov chaw ntawm cov yeeb yaj kiab, tsim dewetting thiab rupture.
Cov roj-raws li defoamers ua haujlwm zoo ib yam li tab sis tsis tshua muaj kev ntseeg siab hauv cov kua dej sib xyaw uas muaj qhov nrawm nrawm tuaj yeem dilute lawv qhov kev ua..
Hybrid defoamers suav nrog cov khoom siv hydrophobic txhawb kev ua haujlwm los ntawm kev muab cov chaw nucleation rau npuas coalescence.
Tsis zoo li lathering agents, defoamers yuav tsum tau soluble me ntsis kom txuas ntxiv mus ua haujlwm ntawm tus neeg siv interface yam tsis tau suav nrog txoj cai rau hauv micelles lossis yaj mus rau theem loj.
3. Influence on Fresh thiab Hardened Qhob Feature
3.1 Kev cuam tshuam ntawm Foaming Agents rau kev ua tau zoo ntawm pob zeb
Lub hom phiaj qhia txog huab cua los ntawm cov neeg sawv cev foaming hloov pauv lub cev ntawm cov pob zeb, txav nws los ntawm ib tug tuab composite mus rau ib tug permeable, cov khoom siv lub teeb.
Thickness tuaj yeem txo qis los ntawm qhov tsis tu ncua 2400 kg/m 5 mus txog 400– 800 kg/m³, nyob ntawm npuas ntim thiab stability.
Qhov no txo qis ncaj qha koom nrog qis thermal conductivity, ua foamed pob zeb ua cov khoom siv tiv thaiv zoo nrog U-tus nqi zoo rau kev tsim lub hnab ntawv.
Txawm li cas los, qhov boosted porosity kuj ua rau txo cov compressive toughness, yuav tsum tau ua tib zoo saib xyuas cov koob tshuaj thiab feem ntau suav nrog cov khoom siv cementitious ntxiv (SCMs) xws li ya tshauv los yog silica fume los txhim kho pore phab ntsa nto zog.
Kev ua hauj lwm feem ntau yog siab vim yog lubricating tshwm sim ntawm npuas, Txawm li cas los xij, kev sib cais tuaj yeem tshwm sim yog tias ua npuas dej ruaj ntseg tsis txaus.
3.2 Kev cuam tshuam ntawm Defoamers ntawm Kev Ua Tau Zoo
Defoamers txhim kho qhov zoo ntawm tus qauv thiab kev ua haujlwm siab ua vaj tse los ntawm kev tshem tawm cov teeb meem tshwm sim los ntawm cua nkag..
Cov huab cua huab cua tsis zoo ua haujlwm raws li kev ntxhov siab thiab kev ntxhov siab concentrators thiab txo qhov txhim khu kev qha load-bearing cross-section, ua rau qis compressive thiab flexural stamina.
Los ntawm kev txo cov chaw no, defoamers tuaj yeem ua rau kom muaj zog toughness los ntawm 10– 20%, tshwj xeeb tshaj yog nyob rau hauv high-strength blends qhov twg txhua qhov ntim feem pua ntawm cov huab cua tseem ceeb.
Lawv kuj txhim kho saum npoo zoo los ntawm kev zam pitting, kab kab, thiab honeycombing, uas yog ib qho tseem ceeb nyob rau hauv architectural qhob thiab daim ntawv-fab daim ntaub ntawv.
Hauv cov txheej txheem tsis muaj dej xws li cov ntim dej lossis hauv qab daus, qis porosity boosts tsis kam mus rau chloride nkag thiab carbonation, expanding lub neej ncua.
4. Daim ntawv thov cov ntsiab lus thiab Compatibility Factors yuav xav txog
4.1 Cov Kev Siv Ib txwm siv rau Foaming Agents
Frothing agents yog ib qho tseem ceeb hauv kev tsim cov cellular pob zeb siv nyob rau hauv thermal rwb thaiv tsev txheej, vov tsev decks, thiab precast lightweight blocks.
Lawv kuj tseem siv rau hauv kev siv geotechnical xws li trench backfilling thiab qhov sib txawv stabilizing, qhov twg tsawg ceev nres overloading ntawm cov av hauv qab.
Nyob rau hauv hluav taws-rated teeb tsa, lub shielding vaj tse los yog kev lag luam khoom ntawm foamed pob zeb muab passive hluav taws tiv thaiv rau architectural yam.
Kev vam meej ntawm cov ntawv thov no nyob ntawm cov khoom siv ua npuas ncauj tshwj xeeb, ruaj ntseg lathering cov neeg sawv cev, thiab cov kev kho mob sib xyaw tsim nyog los ua kom cov huab cua tsis sib xws.
4.2 Kev Siv Feem Ntau rau Defoamers
Defoamers feem ntau yog siv los ntawm kev sib koom ua ke ntawm tus kheej (SCC), qhov twg siab fluidity thiab superplasticizer cov ntsiab lus txhawb txoj kev pheej hmoo ntawm huab cua nkag.
Lawv kuj tseem ceeb hauv precast thiab architectural pob zeb, qhov chaw qhov chaw tiav yog qhov tseem ceeb heev, thiab nyob rau hauv underwater pob zeb positioning, qhov twg cov cua nkag tuaj yeem cuam tshuam kev sib raug zoo thiab kev ua haujlwm.
Defoamers feem ntau yog ntxiv rau me me (0.01– 0.1% los ntawm qhov hnyav ntawm cov cement) thiab yuav tsum tau sib xws nrog lwm cov khoom xyaw, tshwj xeeb polycarboxylate ethers (PCEs), kom tsis txhob muaj kev sib cuam tshuam tsis zoo.
Los xaus, pob zeb frothing neeg sawv cev thiab defoamers sawv cev 2 tawm tsam tsis tau tsuas yog cov tswv yim tseem ceeb hauv kev tswj huab cua hauv cov txheej txheem cementitious.
Thaum cov neeg ua haujlwm frothing txhob txwm tshaj tawm huab cua kom ua tiav lub teeb thiab tiv thaiv tsev, defoamers tshem tawm cov huab cua tsis xav tau los txhawb lub zog thiab thaj chaw zoo.
Paub txog lawv cov chemistry sib txawv, khoom siv, thiab cov txiaj ntsig ua rau nws ua tau rau cov engineers thiab cov tuam txhab ua kom muaj txiaj ntsig zoo tshaj plaws rau ntau yam kev tsim vaj tsev, ua haujlwm, thiab aesthetic xav tau.
Tus kws kho mob
Cabr-Concrete yog tus xa khoom ntawm Cov Khoom Siv Khoom Siv nrog dhau 12 xyoo dhau los hauv nano-tsim hluav taws xob txuag thiab kev tsim kho nanotechnology. Nws lees txais kev them nyiaj ntawm Credit Card, T/T, West Union thiab Paypal. TRUNNANO yuav xa cov khoom rau cov neeg siv khoom txawv teb chaws los ntawm FedEx, DHL, los ntawm huab cua, los yog hiav txwv. Yog hais tias koj tab tom nrhiav rau siab zoo Concrete Admixture, thov koj xav tiv tauj peb thiab xa cov lus nug.
Cim npe: qhob foaming agent,qhob foaming agent nqi,foaming tus neeg sawv cev rau pob zeb
Tag nrho cov ntawv thiab cov duab yog los ntawm Internet. Yog tias muaj teeb meem kev cai lij choj, thov hu rau peb hauv lub sijhawm kom tshem tawm.
Hu rau peb