Redispersible looj cov hmoov yog ib qho siv cov khoom siv roj ntsha feem ntau siv cov organic. Nws yog cov hmoov tau los ntawm cov tshuaj tsuag kom qhuav lub polscer emulsion nrog polyvinyl cawv ua ib qho kev tiv thaiv. Cov hmoov no tuaj yeem rov qab ua dua hauv dej tusyees tom qab ntsib dej. , tsim cov emulsion. Qhov sib ntxiv ntawm dispersible polymer hmoov tuaj yeem txhim kho cov dej sib tov ntawm cov xis ua haujlwm tshiab, hloov kho cov tshuaj corros me thiab corrosion tsis zoo ntawm cov cement ua kom tawv tawv. Cov hauv qab no qhia cov tshuab ntawm cov liab liab polymer hmoov nyob rau hauv xis mas cursion thiab nws cov cawv ntawm kev ua yeeb yam ntawm xis mas.
Qhov cuam tshuam rau Caas Izas Izing txheej txheem thiab cov qauv paste
Ntev npaum li cov khoom siv cai ua kom ntxiv nrog cov kua roj hmab hydroxide tau muab tso rau hauv cov gel thiab cov khoom noj kom tsis muaj qab hau. Nrog rau kev nce qib ntawm cov khoom siv dej ntau dua, thiab cov polymer ua kom loj hlob nyob rau hauv porillary txheej rau saum npoo ntawm cov gel thiab cov hloov pauv tsis zoo. Lub zog polymer hais tias maj mam ua cov hws capillary, tab sis tsis tuaj yeem sau rau sab hauv ntawm thaj chaw sab hauv. Raws li cov dej haus lossis ziab txo kom noo ntxiv, cov pa ua kom sib xyaw ua ke nrog cov khoom sib txuas nrog cov khoom sib xyaw ua ke nrog cov khoom lag luam sib txuas lus ntawm cov khoom lag luam kom muaj kev sib sau ua ke. Vim tias cov khoom lag luam zeb nrog cov ntaub ntawv polymer ib daim txheej npog ntawm lub interface, nws yuav cuam tshuam rau kev loj hlob ntawm ettringite thiab coarse calcium hydroxide muaju; Kuj vim tias cov polymer coagulates rau hauv zaj duab xis nyob rau hauv lub pores ntawm qhov kev hloov pauv kev hloov pauv, uas ua rau cov khoom siv daws teeb meem kev hloov pauv yog denser. Cov pab pawg nquag nyob rau hauv qee cov tshuaj tiv thaiv kab ke, tsim cov qauv kev sib tw tshwj xeeb, txhim kho sab hauv kev ntxhov siab, txo cov khoom sab hauv ntawm microcracks. Raws li cov qauv gel cov qauv tsim, cov dej yog depleted thiab cov polymer hais tau maj mam tawm hauv cov capillary. Nrog kev quav dej ntxiv ntawm cov cement, cov dej hauv cov pa hluav taws xob cov khoom sib xyaw thiab cov khoom siv tsis sib xws, ua ke, tsim cov nplaum sib xyaw nrog cov nplaum loj los yog tus kheej polymer do.
Lub luag haujlwm ntawm dispersible polymer hmoov nyob rau hauv txug yog tswj hwm los ntawm ob txoj kev hloov ntawm cov xis mas polymer zaj duab xis tsim. Kev tsim ntawm ib qho kev sib xyaw ua ke ntawm kev ua kom dej xis thiab polymer zaj duab xis ua tiav hauv 4 kauj ruam:
(1) Tom qab Redispersible looj hmoov yog sib xyaw nrog cov xis mas cug, nws yog uniformly dispersed hauv lub system;
(2) polymer hais tawm ntawm cov nplaim hluav taws xob cov khoom siv gel / tsis muaj kev sib xyaw ua ke;
(3) Cov polymer hais ua ib txheej txuas txuas ntxiv thiab nruj me ntsis;
(4) Thaum lub sij hawm cov txheej txheem casas casent, cov khoom ntim zoo sib xyaw ua ke rau hauv cov yeeb yaj kiab txuas ntxiv, thiab cov khoom lag luam ntawm cov dej ua ke ua kom tiav cov qauv network.
Cov dispersion emulsionic polymer hmoov tuaj yeem tsim cov yeeb yaj kiab-insolub) tom qab tov khoom lag luam tshiab tuaj yeem txhim kho kev ua tau zoo ntawm cov cement; Qee cov pab pawg ncov qaumteb qab teb ntawm cov cement tabs nrog cov qauv kev sib tw tshwj xeeb, uas txhim kho cov qauv kev ua kom zoo nkauj ntawm cov khoom noj kom zoo nkauj thiab kev ua tiav thiab txo qis rau cov kab nrib pleb. Tom qab Redispersible polymer hmoov tau ntxiv, thawj zaug ua yeeb yaj kiab ua ib nrab, thiab cov xis nyob ua ib nrab, thiab ua kom cov paasas ua ib feem tag nrho thiab nws cov khoom siv ntau ntxiv tuaj yeem hloov kho.
Cawv rau ntawm txoj kev sib khi ua lub zog ntawm cov ntaub ntawv casent-based
Emulsion thiab dispersible polymer hmoov tuaj yeem tsim lub zog siab tensile lub zog thiab bondy zog ntawm cov khoom sib txawv tom qab zaj duab xis tsim. Lawv ua ke nrog inorganic binder cement li thib ob phau ntawv tshuaj khib. Maas thiab Polymer tau hais txog muab ua si rau cov kev tshwj xeeb tshwj xeeb, kom cov tshuaj khib tau txhim kho. Los ntawm kev saib xyuas microstructure ntawm cov khoom siv polymer-xis mas cia li muaj cov yeeb yaj kiab polymer thiab dhau los ua ib feem ntawm phab ntsa. Kev sib cais lub zog, yog li nce zuj zus ntawm kev ua tsis tiav ntawm lub tshuaj khib thiab ua kom nce qhov kawg. Lub sijhawm ua tau zoo ntev ntawm cov refispersible polymer hmoov nyob rau hauv lub tshuaj khib tau kawm. Nws tau pom los ntawm SEM tias tom qab 10 xyoo, Micrchology thiab morphology ntawm lub colp tseem tsis hloov pauv, tswj kev ruaj ntseg kev sib raug zoo thiab compression resistance. lub zog thiab zoo hydrophobicity. Wang Ziming li al. [11] Kawm txog kev tsim kho mechanism ntawm recispersible looj cov ntsiab lus ntawm lub tshuab ua pa, thiab tom qab lub sijhawm ua haujlwm, thiab tom qab ntawd thaum lub sijhawm teeb tsa, tus Polymer tseem muaj pab txhawb rau cov txheej txheem hydration thiab shrinkage ntawm cov cement hauv phau ntawv. Qhov zoo tshaj plaws, txhua yam uas yuav muaj kev pab zoo los txhim kho txoj hlua khi.
Ntxiv cov refispersible looj tau txig cov hmoov av thiab cov hmoov av ntawm cov khoom noj kom xis nyob ua ke, thiab cov hmoov nplej nkaus rau hauv cov hws thiab cov hlab ntsha. Cov yeeb yaj kiab sab hauv yog tsim thiab nthuav dav ntawm cov npoo av, yog li ua kom muaj kev sib tw zoo ntawm cov khoom qab zib cov khoom siv thiab cov substrate.
Qhov ua tau zoo ntawm kev ua haujlwm ntawm kev tshuaj khib nyiab ntawm cov hmoov yas ntawm cov hmoov yas yog cov tshuaj yas polymular nrog cov pab pawg polar. Thaum cov hmoov yas looj nrog eps hais tawm, cov tsis yog-polymer tseem muaj lub cev adsorption yuav tshwm sim nrog cov tsis yog-polar nto ntawm EPS. Cov pawg polar hauv cov polymer yog kev taw qhia sab nraud ntawm EPS hais, kom cov EPS hais tawm ntawm hydrophibicity rau hydrophilicity. Ntab, qhov teeb meem ntawm cug kab cug txheej loj. Nyob rau lub sijhawm no, ntxiv cement thiab sib xyaw, cov pawg polar adsorbed rau ntawm eps ua ke, yog li cov haujlwm ntawm EPFULATIONY hloov kho. Qhov no yog manifested nyob rau hauv qhov tseeb tias EPS yooj yim wetted los ntawm cov cement slurry, thiab txoj hlua khi ntawm ob yog kev txhim kho zoo heev.
Cawv ntawm kev hloov pauv ntawm cov ntaub ntawv cas-basy
Redispersible looj lub zog, Adhesion lub zog thiab lwm yam khoom ntawm cov duab colfer rau saum npoo ntawm lub tshuaj khib nyiab. Muaj cov hws ntawm cov duab ntawm zaj duab xis, thiab saum npoo ntawm cov hws muaj cov tshuaj khib nyiab puv, yog li kom cov kev ntxhov siab yog txo qis. Thiab nyob rau hauv kev txiav txim ntawm sab nraud quab yuam yuav muab so yam tsis muaj kev puas tsuaj. Ntxiv rau, lub tshuaj khib ua cov pob txha txhav txhav txhav tom qab lub cev muaj kev sib koom ua ke, zoo ib yam li cov nqaij ntawm tib neeg lub cev. Zaj duab xis tsim los ntawm cov polymer tuaj yeem muab piv rau pob qij txha thiab ligosents, yog li ua kom muaj kev ua kom muaj kev ywj pheej thiab tawv.
Nyob rau hauv polymer-modified coll coll cug system, kev ua yeeb yam txuas ntxiv thiab ua kom lub cev ua kom zoo nkauj, thiab tib lub sij hawm sau cov tshuaj tsw qab thiab cov kab noj hniav kom ua kom tag nrho mus rau hauv lub network elastic. Yog li ntawd, cov yeeb yaj kiab polymer tau ua kom tau zoo hloov cov siab thiab nruj nro. Cov yeeb yaj kiab polymer tuaj yeem ua rau shrinkage nrib pleb ntawm cov kab hlau-cug, thiab txhim kho lub qhov cub ua kom zoo thiab txhim kho lub zog ntawm lub tshuaj khib. Lub xub ntiag ntawm cov hloov tau yooj yim thiab elastic polymer sib txhim kho qhov yooj thiab elasticity ntawm lub colp, muab cohesive thiab kev coj ua kom sib xyaw rau cov pob txha txhav. Thaum lub zog sab nraud yog siv, cov txheej txheem microcrack hais tawm yog ncua vim kev txhim kho hauv kev txhim kho thiab elasticity kom txog thaum muaj kev ntxhov siab ntau dua. Lub interwoven polymer domains kuj ua lub luag haujlwm hauv kev sib koom ua ke ntawm microcacks rau hauv cov kab ke. Yog li ntawd, cov neeg tsis txaus siab polymer hmoov nce qhov kev ntxhov siab tsis ua haujlwm thiab tsis ua tiav cov khoom siv.
Cawv ntawm lub durability ntawm cov khoom noj movent-based
Kev tsim ntawm cov yeeb yaj kiab txuas ntxiv yog qhov tseem ceeb tshaj plaws rau cov khoom ntawm polymer-hloov Cah Menmars. Thaum lub sijhawm teeb tsa thiab cov txheej txheem tawv ntawm cov ntxhib muab tshuaj txhuam, ntau cov kab noj hniav yuav tsim tawm sab hauv, uas ua rau cov tsis muaj zog ntawm cov cement muab tshuaj txhuam. Tom qab Recispersible polymer hmoov tau ntxiv, cov hmoov polymer ua rau kev sib chwv dej, thiab accumulates hauv thaj chaw muaj dej (piv txwv li, hauv kab noj hniav). Raws li cov cement muab tso thiab ua kom tawv nqaij, kev txav ntawm cov polymer hais ua ntau dua thiab huab cua sib cuam tshuam ntawm cov dej thiab huab cua ua rau maj mam ua ke. Thaum cov polymer hais tau pib sib chwv ib leeg, cov dej hauv cov pa hluav taws xob, thiab cov duab kos ua ke ib ncig kab noj hniav, ntxiv dag zog rau cov pob hluav taws xob no. Nyob rau lub sijhawm no, cov yeeb yaj kiab polymer tsis tuaj yeem tsuas yog ua rau lub luag haujlwm hydropobic, tab sis kuj yuav tsis thaiv cov capillary, yog li ntawd cov khoom muaj zoo hydrophobicity thiab huab cua permeability.
CUG CAPT CUG yam tsis muaj ntxiv cov polymer yog xoob heev. Ntawm qhov tsis sib xws, cov polymer hloov pauv cem zoo ua rau muaj kev sib xyaw tag nrho vim muaj zaj duab xis polymer, yog li tau txais cov cuab yeej zoo dua thiab huab cua tiv thaiv. kev sib deev. Nyob rau hauv cov kab ke ntawm cov hmoov nplej-hloov kho cov hmoov av ntawm cov cement ntawm lub porosity hloov pauv ntawm lub porosity ntawm lub porosity yog cia li hloov pauv. Tom qab cov hmoov looj tes yas yog tsim rau hauv cov tshuaj khib nyiab thiab cov qauv hloov pauv tau zoo dua, yog li cov khoom siv ntawm cov kev phom sij ntawm kev ua yeeb yam yog txhim kho. Nws muaj cov txiaj ntsig zoo ntawm kev txhim kho ntawm cug tshuaj khib.
Tam sim no, Dispersible polymer hmoov ua lub luag haujlwm tseem ceeb ua kev ntxiv rau kev siv kab. Ntxiv cov refispersible looj tuaj yeem npaj muaj cov colling hlau nplaum, ua ke grout, kho cug, kho cug thiab waterproof seuting cov khoom. Daim ntawv thov tau txais thiab thov kev ua tau zoo ntawm kev tshuaj tua tsim vaj tsev. Ntawm chav kawm, muaj cov teeb meem ntawm kev yoog raws li dispersible polymer hmoov thiab xis mas, uas yuav tsum tau txais kev saib xyuas kom txaus hauv cov ntawv thov.
Lub Sijhawm Post: Feb-20-2025