Zaj duab xis tsim txheej txheem ntawm RDP hauv Cement Mortar

Cov txheej txheem tsim cov yeeb yaj kiab ntawm Redispersible Polymer Powder (RDP) hauv cov cement mortar muaj ob peb theem uas ua rau muaj kev txhim kho ntawm cov yeeb yaj kiab polymer uas muaj zog thiab ruaj khov. Nov yog ib qho kev piav qhia ntawm cov txheej txheem tsim zaj duab xis:

1. Dispersion: Thaum pib, RDP hais yog dispersed uniformly nyob rau hauv lub aqueous theem ntawm cov cement mortar mix. Qhov no dispersion tshwm sim thaum lub sij hawm sib tov, qhov twg RDP hais yog nkag mus rau hauv lub mortar sib tov nrog rau lwm cov khoom xyaw qhuav.
2. Dej: Thaum sib cuag nrog dej, hydrophobic polymer hais hauv RDP pib o thiab nqus dej noo. Cov txheej txheem no, hu ua hydration, ua rau cov khoom siv polymer kom soften thiab ua ntau pliable.
3. Zaj duab xis tsim: Raws li cov mortar sib tov yog siv thiab pib kho, cov hydrated RDP particles coalesce thiab fuse ua ke los tsim ib tug nruam polymer zaj duab xis. Zaj duab xis no adheres rau saum npoo ntawm lub mortar matrix thiab khi ib tug neeg hais ua ke.
4. Coalescence: Thaum lub sij hawm kho, RDP cov khoom nyob ib sab tuaj rau hauv kev sib cuag thiab nkag mus rau coalescence, uas lawv sib koom ua ke thiab tsim cov ntawv cog lus sib txuas. Cov txheej txheem coalescence no pab tsim kom muaj kev sib koom ua ke thiab txuas ntxiv polymer network nyob rau hauv mortar matrix.
5. Crosslinking: Raws li cov cement mortar kho thiab hardens, tshuaj crosslinking tuaj yeem tshwm sim ntawm cov saw hlau polymer hauv RDP zaj duab xis. Cov txheej txheem crosslinking no ntxiv dag zog rau cov yeeb yaj kiab thiab txhim kho nws cov adhesion rau cov substrate thiab lwm yam khoom siv khib nyiab.
6. Kev ziab thiab kev sib xyaw ua ke: Cov cement mortar tau ziab thiab sib sau ua ke raws li cov dej evaporates los ntawm kev sib tov thiab cov cementitious binders kho. Cov txheej txheem no pab txhim kho RDP zaj duab xis thiab sib xyaw ua ke rau hauv cov khoom siv tawv tawv.
7. Kev Tsim Yeeb Yam Kawg: Tom qab ua tiav cov txheej txheem kho, RDP zaj duab xis tsim tag nrho thiab dhau los ua ib feem tseem ceeb ntawm cov cement mortar qauv. Cov zaj duab xis muab ntxiv cohesiveness, yooj, thiab durability rau lub mortar, txhim kho nws tag nrho cov kev ua tau zoo thiab tsis kam mus tawg, deformation, thiab lwm yam mechanical stresses.

Cov txheej txheem tsim cov yeeb yaj kiab ntawm RDP hauv cov cement mortar suav nrog hydration, coalescence, crosslinking, thiab consolidation theem, uas sib koom ua ke rau kev txhim kho cov yeeb yaj kiab uas muaj zog thiab ruaj khov nyob rau hauv mortar matrix. Cov yeeb yaj kiab no txhim kho qhov adhesion, yoog raws, thiab ua haujlwm ntev ntawm cov mortar, txhim kho nws cov kev ua tau zoo hauv ntau daim ntawv thov kev tsim kho.