Lub luag haujlwm ntawmrov yaj tau duapolymerhmoovhauv cov hmoov putty: nws muaj cov khoom nplaum zoo thiab cov khoom siv kho tshuab, zoo heev tsis muaj dej, permeability, thiab zoo heev alkali tsis kam thiab hnav tsis kam, thiab tuaj yeem txhim kho kev khaws cia dej thiab nce lub sijhawm qhib rau kev txhim kho durability.
1. Cov nyhuv ntawm cov tshuaj khib sib xyaw tshiab
1) Txhim kho kev tsim kho.
2) Ntxiv dej kom khaws tau zoo dua qub kom cov cement noo.
3) Ua kom muaj peev xwm ua haujlwm tau zoo dua.
4) Tsis txhob tawg ua ntej.
2. Cov nyhuv ntawm cov tshuaj nplaum tawv
1) Txo cov elastic modulus ntawm cov mortar thiab ua kom muaj kev sib raug zoo nrog cov txheej hauv paus.
2) Ua kom yooj ywm dua thiab tiv taus kev tawg.
3) Txhim kho qhov kev tiv thaiv rau cov hmoov poob.
4) Hydrophobic los yog txo qhov nqus dej.
5) Ua kom qhov lo rau txheej puag nce ntxiv.
Cov hmoov latex uas tawg tau dua tshiab ua cov polymer emulsion thaum sib cuag nrog dej. Thaum lub sijhawm sib tov thiab ziab, cov emulsion raug qhuav dua. Cov hmoov latex ua haujlwm hauv cov hmoov putty, thiab cov txheej txheem tsim cov txheej txheem sib xyaw ntawm cov cement hydration thiab cov hmoov latex zaj duab xis tsim tiav hauv plaub kauj ruam:
①Thaum cov hmoov latex uas rov tawg tau sib xyaw nrog dej hauv cov hmoov putty, nws tau tawg mus rau hauv cov khoom me me polymer;
②Cov cement gel maj mam tsim los ntawm kev pib hydration ntawm cov cement, cov kua theem yog saturated nrog Ca (OH) 2 tsim thaum lub sijhawm hydration, thiab cov polymer particles tsim los ntawm cov hmoov latex yog tso rau ntawm qhov chaw ntawm cov cement gel / unhydrated cement particle sib tov;
③ Thaum cov cement tau hydrated ntxiv, cov dej hauv cov capillary pores txo qis, thiab cov polymer particles maj mam raug kaw hauv cov capillary pores, tsim ib txheej nruj nreem rau ntawm qhov chaw ntawm cov cement gel / unhydrated cement particle sib tov thiab filler;
④ Nyob rau hauv qhov kev ua ntawm cov tshuaj tiv thaiv hydration, txheej hauv paus nqus thiab qhov chaw evaporation, cov dej noo ntxiv raug txo qis, thiab cov txheej stacking tsim tau sib sau ua ke rau hauv ib zaj duab xis nyias, thiab cov khoom tshuaj tiv thaiv hydration tau sib txuas ua ke los tsim cov qauv network tiav. Lub kaw lus sib xyaw ua ke tsim los ntawm cement hydration thiab latex hmoov zaj duab xis tsim txhim kho qhov dynamic cracking tsis kam ntawm putty.
Los ntawm qhov kev siv tiag tiag, lub zog ntawm cov putty siv ua txheej hloov pauv ntawm cov rwb thaiv tsev sab nraud thiab cov txheej ntawm phab ntsa sab nraud yuav tsum tsis txhob siab dua li ntawm cov plastering mortar, txwv tsis pub nws yooj yim los tsim kev tawg. Hauv tag nrho cov txheej txheem rwb thaiv tsev, qhov yooj ywm ntawm cov putty yuav tsum siab dua li ntawm cov substrate. Ua li no, cov putty tuaj yeem hloov kho tau zoo dua rau qhov deformation ntawm cov substrate thiab buffer nws tus kheej deformation nyob rau hauv qhov kev ua ntawm cov yam ntxwv sab nraud, txo qhov kev ntxhov siab concentration, thiab txo qhov ua tau ntawm kev tawg thiab tev ntawm cov txheej.
Lub sijhawm tshaj tawm: Lub Kaum Hli-27-2022