Kev Siv RDP thiab VAE Sib Thoob Nyob rau hauv Daim Duab Mortar

Yuav li cas RDP thiab VAE nyob ib leeg thiab sib khev tau hauv qab thaum xiab sov ua sement

Kev sib txig ntawm Redispersible Polymer Powder (RDP) nrog Vinyl Acetate Ethylene (VAE) copolymers ua haujlwm zoo tshaj plaws thaum cement tau sib thooj nrog dej. Thaum kawg siv sib thooj, RDP yuav cuam tshwm los ntawm polymer latex uas muaj feem ntau hauv qhov chaw cement. Tom qab no, VAE pab tso tseg zoo dua nyob rau sab nraud siv cov hydrogen bond peb tau kawm hauv xab npuag tsev neeg. Thaum cement mus ntxhiab ntxhiab, cov duab plaum polymer no yuav moom tawm los tsim ib qho film siv zoo uas txuas nrog cov khoom siv cement. Qhov teeb meem yog? Cov siv khoom uas muaj ob hom polymer no yuav tshaug tau li 18 mus rau 22% dej ntau dua li cov uas tsuas muaj ib hom polymer xwb, raws li kev suav pov tseg los ntawm Kemoxcellulose xyoo 2024. Tom qab no, cov khoom siv yuav tshaug zoo dua vim cov duab plaum polymer sib cuam tshwm zoo nrog cov duab plaum cement los ntawm lawv lub zog hluav taws xob. Cov neeg tsim khoom nyiam no vim nws txhais tau tias concrete yuav tsis tuaj saus ntev thiab tsis tas siv ntau yam khoom siv hauv qab tsho.

Qhov Kev Coalescence ntawm Redispersible Polymer Powders thiab VAE Copolymers

Qhov kev pheej hmoo ntawm RDP's polymer chains nrog VAE's ethylene-rich domains tsim ib qhov hybrid network uas txhim kho qhov chaw nyob sab nraud ntawm cement-thaub hluas. Qhov tseem ceeb tshaj plaws yog:

• Kev Nyiaj Ib Pib : RDP particles rov cuav rau hauv cov kab ntawv ntawm substrate, thaum VAE tsim cov covalent bonds nrog silicate surfaces
• Kev Tsim Film : Qhov kev txwv xwm zoo ntawm RDP thiab VAE polymers nyob hauv qhov sijhawm kuab tuaj rau ib qhov matrix uas tsis muaj kev phem
• Qhov Plasticizing : Cov polymer systems nyob together li plua pluag 5–7% cov neeg siv dej tsis tas yuav kom muaj zog ntev

Cov kev txiav txim no txhais tias vim li cas cov dual-polymer systems tau 29% siab dua hauv tensile adhesion rau tile adhesives kompared to standalone additives.

Kev Txhim kho RDP/VAE Ratios rau Workability, Cohesion, thiab Bond Strength

Txoj ratios ntawm 3:1 RDP/VAE thim los ua kev tsim nyog rau qhov tseem ceeb:

Yog tshaj 25% neeg muaj feem ntau yam polymer yuav tuaj yeem delay sijhawm thawj nplooj los txog 40 feeb. Qhov kev ua zoo tshaj plaws yog siv 2–4% RDP thiab 0.5–1.5% VAE hauv qhov chaw siv ntau.

Kev nyob tau ntau dua ntawm kev siv ob yam polymer hauv mortar siv ntau: Lub teb chaws thiab cov cuab yeej tshua cuab

Lub teb chaws nyob rau lub zog siab dua ntawm khoom siv rau kev tsim kho tseem ceeb rau 14% kev nce tshaj tawm hlis ntawm tus cwj pwm RDP-VAE (Marketwise 2024). Cov cuab yeej tshua cuab tseem ceeb uas pab ntxiv kev nyob tau ntau yog:

1. Substrate yoov yooj zoo : Nyob nrog cov tile uas muaj qhov absorption tsuas yog (qis dua 0.5%) thiab cov khoom siv EPS
2. Kev siv hauv kev lag luam : Sijhawm nplooj ntev (ntxiv 30 feeb lossis ntev dua) raug ib txwm xws li ISO 13007-1
3. Cov nyob rau hauv noj : Txo tau txog 22% cov cement thaum tsis txo kev ceev

Peev Xwm: Kev Nce Tshaj Hauv Khoom Nyob Tile nrog RDP-VAE

Ib qhov chaw tsim khoom uas nyob ze daim teb Hes tshwj tsis tau txais ISO 13007 C2TE-S1 los substituting 2.1% cement nrog 4% RDP/1.2% VAE. Tus khoom nyob tshiab tau pom:

• 40% ntau dua nyob rau kev sib txuas zav tshaj (1.8 MPa vs 1.3 MPa)
• Kev ua haujlwm zoo txaus siab dua 50 zaug ntawm kev sov thiab thawb tsis muaj kev sib tso tawm
• 75% txo kev ntxig ntawm kev ruaj

Kev test nyob rau hauv cheeb tsam pom tias kev xa tuaj ntev tshaj 23% vim muaj kev tso caij nqem ntau dua rau hauv qab ntuj

Cov yam ntxwv kev ua haujlwm ntawm mortar tau ntxiv los ntawm RDP thiab VAE ib lub srid

Kev raug zoo ntawm kev ntxig thiab kev ruaj ntawm kev hloov kho polymer

Thaum muab rau hauv, RDP thiab VAE pib los ua ke kom dha tshem qhov teeb meem ntawm mortar tsis zoo li cas thaum tsis txav kawg qhov tseem ceeb ntau heev. RDP tsim cov saum npoo film siv roj tshuaj uas pab faib qhov nyuj siab thaum muab nqi rau hauv, uas tuaj yeem nthuav tawm qhov nyuj siab dua li 40% mus rau 60% hauv cov ntaub ntawv uas tau muab rau hauv. Tom qab no, VAE pib txhim kho qhov sib txuas ntawm cov duab tshiab vim nws muaj qhov tshuaj plua pluag siv ethylene, yog li qhov nyuj siab tsawg kawg yam li mortar tshaiv, tsawg kawg dua li 5% tshaj li tus naj npawb tshaiv. Ntau tshaj plaws neeg tsim khoom pom tias muab peb qhov RDP thiab ib qhov VAE muab rau hauv ib leeg yuav pab tau qhov kev pib zoo tshaj plaws. Qhov kev muab rau hauv no muaj qhov nyuj siab txog 2.8 MPa thiab tshuav nyuj siab zoo tshaj plaws nyob rau 32 MPa, ua rau nws muaj zog tshaj rau cov kev siv zog loj xwb xws li kev siv adhesive rau cov kab ntsug uas xav tau kev pab nqa nqi lossis cov kab ntsug hauv dej uas xav tau kev nyiam nkaus.

Kev Pib Txheej Txheem Nyuj Siab: Cov Ntaub Ntawv Siv Tau Li 28 Hnub ntawm RDP-VAE Mortars

Tom qab sau ntxoov, cov chaw tsim dua-polymer muaj kev nyiam zoo dua. Nyob rau hni 28, cov mortar uas muaj 4% polymer muaj:

Kev sib txuas zoo tshaj plaws 62% yog qhov tseem ceeb heev rau kev siv hauv qab tshooj uas xav tau kev sib txuas ntev.

Sib ntaus sib tua txog qhov kev lag luam thoob ntsoov ntawm polymer ntau hauv mortar

Txhawm rau 5% polymer txhua yam muaj kev tsim kho tshaj tsho (kev nyuaj siab 3.4 MPa), tab sis tshaj 6% muaj kev phem:

• Kev ua haujlwm lom tso 30% vim tias xav tau dej ntau dhau
• Kev lag cov rooj kuaj cuam tshuab nce 15% los ntawm kev poob siab khw
• Qhov kev nrawm thiab kev pheej hmong loj dua, uas muaj 7% cov ntaub ntawv ntau dua 18% vim ib qho kev nyuaj tsuas yog 2%

Tus ntaub ntawv sau tseg tias 3–4.5% polymer tuaj yeem nrab tau ROI thaum twg kuj npaj rau EN 13813 standard rau cov chaw nres thiab cov rooj kuaj cuam tshuab

Kev txhim kho microstructural thiab kev txhim kho ITZ hauv RDP-VAE muab cov mortar

Kev tsim kho ntawm polymer film thiab nws txoj haujlwm hauv kev txhim kho qhov chaw sib sau

Thaum muab chung rau hauv, RDP thiab VAE polymers ua haujlwm piv txwv li ib leeg nyob hauv qhov kev sib poob ntawm zav. Lawv tsim cov duab plaub uas tshwm sim nyob hauv cov rooj khaum me me thiab txhim kho qhov uas hu ua qhov chaw sib poob (interfacial transition zone) lossis ITZ saum no. Qhov uas pheej xwm tom qab yog tias cov duab plaub no sib sau nrog nrog cov zav thiab cov khoom sib txawv nyob sab nraud. Qhov sib sau no txo qhov porosity ntawm ITZ ntau yam li 32% dua li thaum siv ib hom polymer xwb. Qhov kev sib cuag no ua haujlwm vim RDP muaj qhov tswj nqus los ntawm thaum kawg thiab VAE muab qhov tshuaj txhob ntxuav dej mus rau hauv. Tom qab ntawv lawv tsim qhov ITZ zoo dua thiab zoo dua kom tsis txhob muaj kev puas tsuaj thiab tsaus cov microcracks los pheej. Ib co kev test hauv lab tuaj yeem pom tias kev sib raug zoo ntawm RDP thiab VAE tuaj yeem nthuav dav qhov nyiaj koob ntawm ITZ nearly 19%. Qhov nyiaj koob zoo dua txhais tau tias khoom siv ntev dua tsis txhob muaj kev nyuaj hauv kev tsim kho.

SEM Pheej Xwm Txog Qhov Muaj Lub Matrix Thaiv Ntau Ntxig, Nyab Xeeb Haj Yim Hnub Noj Hmoob Chaw Dual-Polymer

Kev soj ntsuas kab ntsug (SEM) qhia txog cov cuab yeej sib txawv hauv RDP-VAE mortars:

• Txo qhov chaws ntshug siab : Lub polymer films sau caij rau kev khaum tawm, dual-polymer systems muaj 18% tsawg dua qhov chaws ntshug siab koom nrog RDP-them formulations.
• Cov khoom nyab xeeb haj yim : VAE copolymers pab zoo dua rau kev xaum ntawm lub particle hauv lub microscale, txo cov av tsha uas loj dua li 10 µm los ntawm 41%.

Qhov kho tshiab no hauv lub microstructure sib phim nrog kev pab hlobov rooj ua si (up to 14.2 MPa ntawm 28 hnub) thiab txo qhov sib thooj ntawm capillary ( 27% saud dua ), tso kom pom tias kev hloov pauv sib txawv ntau yam muaj peev xwm.

Qhov tsim nyog ntawm RDP-VAE hloov pauv Mortars nyob rau qhov chaw nyuaj

Pom zoo dua ntawm qhov tshem kauv thiab qhov tsim nyog ntawm kev sov thiab thawb nrog VAE

Thaum pib mus txhawm rau tso kom mortar nyob ntev dua, RDP thiab VAE rau ib lub tib neeg tuaj yeem sau hluv kub thaum chaw tshwm sim los ntawm 60%, uas yog qhov txaus siab thaum saib xyuas mortar tshaib. Qhov uas tshwm sim no yog tias cov VAE polymer tsim tso rau ib chaw muaj zog hauv ib puag ncig, feem ntau yog tseem ceeb rau cov kab ntsug thiab cov rooj uas dej yuav tsum tau nqes mus. Qhov no tsim tso rau ib chaw tiv thaiv dej tsis pub nqes mus. Tom qab kho los ntawm dej ntxuav thiab dej sov, mortar uas tau siv RDP thiab VAE tau khaws tseg li 98% zog tom qab 50 zaug ntawm kev kho no, thaum li cas li ib qho kev lag luam tshaib tsuas muaj li 72%. Ib qho yooj yim dua uas yuav tsum pom yog VAE ua rau tus lej muaj peev xwm siv hauv kev siv, yog li tsev tuaj yeem tiv thaiv kev hloov pauv le le thaum sijhawm ntev tsis pub tshav tawm kev tiv thaiv dej.

Kev Tsis Txom Tes Thiab Kev Sauj Ntswj Qhov Chaw Nyiag Nyob Rau Hauv Cov Renders Ntuj Qab Siv RDP-VAE

Nyob hauv qhov chaw mli hluaj tshaj plaws li casementitious substrates, RDP-VAE siv cov txoj cai twg los cuam tshuam rau 40–55% ntawm kev poob siab uas tsim los ntawm alkali:

• RDP particles yuav alkali ions mus, kom tsawg kawg tau kev ntxig taws ntxig taw
• VAE films txuas ntxiv rau qhov chaw nyob saum npoo thiab cement, kom tsis pub muaj kev poob siab

Cov kev suav txog cov khoom siv nyob saum npoo zeeg pom tias cov siv 3–5% polymer muaj feem ntau tsawg dua 0.1 mm kev poob siab tom qab 12 xyoos siv – 50% tsawg dua li cov siv polymer ib qho. Qhov kev tso tseg alkali no txhawj xeeb rau kev siv zoo nyob rau zeeg thiab qhov chaw ua haujlwm uas muaj tshaub thiab CO₂ uas ploj tso cov mortars theej thaj.

FAQ Qeb

RDP thiab VAE yog dab tsi? RDP yog lus sau ua Redispersible Polymer Powder thiab VAE yog Vinyl Acetate Ethylene. Ob qho no yog polymers siv los pab ntxiv rau kev siv zog rau cov khoom siv cementitious.

Yuav vim li cas RDP thiab VAE tau muab chung siv rau hauv cement matrices? Kev muab RDP thiab VAE rau hauv cov duab ntawm cement tuaj yeem pab txhim kho kev tso siab, cuam tshuam ntxiv qhov nyiaj ib tug, thiab pab tau zoo dua rau kev siv thiab kev nyob dav ntawm cov cement.

Yuav tsum muaj qhov ratio twg yog tseem ceeb tshaj plaws rau RDP thiab VAE? Qhov ratio ntawm 3:1 RDP thiab VAE tuaj yeem pab tswj yooj yim, kev nyob ruaj khov, thiab qhov nyiaj ib tug tau zoo.

Dual-polymer systems txoj kev pab tshwm sim li cas rau kev txaus siab ntawm mortars? Lawv pab txhim kho kev txaus siab rau dej, kev nyob ruaj khov thaum mob noo thiab mob txias, thiab kev txaus siab rau alkali, uas pab cov mortars nyob dav dua nyob rau qhov chaw tsis zoo.

Cov kev pab los ntawm kev siv dual-polymer systems rau hauv cov mortars siv tsham yog dab tsi? Dual-polymer systems pab txhim kho cov ntsiab lus nyob rau hauv khaub ncaws, kev nyob ruaj khov dua, thiab cov kev pab rau kev nyob ruaj khov los ntawm kev reduce qhov yuav tsum tau siv cement.