Lub mechanism ntawm kev txiav txim ntawm Redispersible Polymer Powder (RDP) nyob rau hauv qhuav mortar

Redispersible Polymer Powder (RDP)yog ib qho tseem ceeb ntxiv rau hauv cov tshuaj khib nyiab qhuav, muab ntau yam txiaj ntsig xws li kev txhim kho adhesion, cohesion, yooj, thiab ua haujlwm. Nws cov txheej txheem ntawm kev nqis tes ua cuam tshuam nrog ntau theem, los ntawm kev sib cais hauv dej mus rau kev cuam tshuam nrog lwm cov khoom hauv cov tshuaj khib nyiab. Cia peb delve rau hauv cov ncauj lus kom ntxaws mechanism:

Dispersion hauv dej:
RDP particles yog tsim los kom tawg sai sai thiab sib npaug hauv dej vim lawv qhov xwm txheej hydrophilic. Thaum ntxiv dej rau hauv cov tshuaj khib nyiab qhuav, cov khoom no swell thiab tawg, tsim kom muaj kev ruaj ntseg colloidal ncua. Cov txheej txheem dispersion no nthuav tawm thaj tsam loj ntawm cov polymer mus rau ib puag ncig ib puag ncig, ua kom muaj kev sib cuam tshuam tom qab.

Zaj duab xis tsim:
Raws li cov dej txuas ntxiv tau muab tso rau hauv cov tshuaj khib nyiab, cov khoom sib cais RDP pib hydrate, tsim cov yeeb yaj kiab tas li nyob ib puag ncig cov cementitious hais thiab lwm cov khoom siv. Cov yeeb yaj kiab no ua raws li kev thaiv, tiv thaiv kev sib cuag ncaj qha ntawm cov ntaub ntawv cementitious thiab sab nraud noo noo. Qhov no yog qhov tseem ceeb rau kev txo cov dej ingress, txhim kho durability, thiab txo qhov kev pheej hmoo ntawm efflorescence thiab lwm yam degradation.

Enhanced Adhesion thiab Cohesion:
Cov yeeb yaj kiab polymer tsim los ntawm RDP ua haujlwm ua tus neeg sawv cev sib koom ua ke, txhawb kev adhesion ntawm mortar thiab ntau yam substrates xws li pob zeb, masonry, lossis vuas. Cov yeeb yaj kiab kuj tseem txhim kho kev sib koom ua ke hauv cov tshuaj khib nyiab los ntawm kev sib txuas ntawm qhov sib txawv ntawm cov khoom, yog li txhim kho tag nrho lub zog thiab kev ncaj ncees ntawm cov tshuaj khib nyiab.

Flexibility thiab Crack Resistance:
Ib qho ntawm cov txiaj ntsig tseem ceeb ntawm RDP yog nws lub peev xwm los muab kev hloov pauv mus rau mortar matrix. Polymer zaj duab xis haum rau me me substrate txav thiab thermal expansions, txo qhov kev pheej hmoo ntawm tawg. Tsis tas li ntawd, DPP txhim kho lub zog tensile thiab ductility ntawm lub mortar, ntxiv txhim kho nws cov kev tiv thaiv kom tawg nyob rau hauv ob qho tib si zoo li qub thiab dynamic loads.

Kev tuav dej:
Lub xub ntiag ntawm RDP nyob rau hauv lub mortar mix pab tswj cov dej tuav, tiv thaiv kom ceev evaporation thaum lub sij hawm thaum ntxov ntawm kev kho. Lub sij hawm ntev hydration no txhawb kom tiav cov cement hydration thiab ua kom pom kev txhim kho ntawm cov khoom siv dag zog, xws li compressive thiab flexural zog. Tsis tas li ntawd, kev tswj dej tuav tau pab txhawb kev txhim kho kev ua haujlwm thiab lub sijhawm qhib lub sijhawm ntev, ua kom yooj yim rau kev thov thiab ua tiav ntawm cov mortar.

Durability Enhancement:
Los ntawm kev txhim kho adhesion, saj zawg zog, thiab tsis kam mus rau tawg, DPP ho txhim khu lub durability ntawm qhuav mortar daim ntaub ntawv. Cov yeeb yaj kiab polymer ua raws li kev tiv thaiv kev tiv thaiv kev ya raws, kev tawm tsam tshuaj lom neeg, thiab kev ua qias tuaj ib puag ncig, yog li txuas ntxiv kev pab cuam lub neej ntawm cov mortar thiab txo cov kev tu ncua.

Compatibility nrog Additives:
RDPnthuav tawm kev sib raug zoo nrog ntau yam khoom siv uas feem ntau siv hauv cov tshuaj khib nyiab qhuav, xws li cua nkag, accelerators, retarders, thiab pigments. Qhov kev ua tau zoo no tso cai rau kev hloov kho ntawm cov khoom khib nyiab kom tau raws li cov kev xav tau tshwj xeeb rau kev siv sib txawv thiab ib puag ncig.

Lub mechanism ntawm kev txiav txim ntawm dispersible polymer hmoov nyob rau hauv qhuav mortar muaj dispersion nyob rau hauv dej, tsim zaj duab xis, txhim kho adhesion thiab cohesion, yooj thiab tawg kuj, dej tuav, durability li, thiab compatibility nrog additives. Cov kev sib xyaw ua ke no pab txhawb kev txhim kho kev ua haujlwm, kev ua haujlwm tau zoo, thiab ua haujlwm ntev ntawm cov tshuab mortar qhuav thoob plaws ntau yam kev tsim kho.