Yuav ua li cas redispersible polymer hmoov cuam tshuam qhov yooj ntawm mortar?

Lub admixture muaj txiaj ntsig zoo rau kev txhim kho kev ua haujlwm ntawm lub tsev qhuav-sib xyaw mortar. Redispersible latex hmoov yog tsim los ntawm cov tshuaj tsuag kom qhuav ntawm tshwj xeeb polymer emulsion. Cov hmoov polymer qhuav yog qee qhov 80 ~ 100mm spherical hais sib sau ua ke. Cov khoom no yooj yim soluble nyob rau hauv dej, tsim ib tug ruaj khov dispersion me ntsis loj dua cov thawj emulsion hais, thiab tsim ib zaj duab xis tom qab lub cev qhuav dej thiab qhuav.

Kev hloov pauv sib txawv ua rau cov hmoov av rov ua dua tshiab muaj cov khoom sib txawv xws li dej tsis kam, alkali tsis kam, huab cua tsis kam thiab yoog raws. Redispersible latex hmoov rau mortar tuaj yeem txhim kho qhov cuam tshuam, ua haujlwm ntev, hnav tsis kam, kev tsim kho yooj yim, daim ntawv cog lus lub zog thiab cohesion, huab cua tsis kam, khov-thaw tsis kam, dej tsis kam, flexural zog thiab tsis kam ntawm mortar folding lub zog. Tsuav yog cov khoom siv cement-based uas muaj latex hmoov nyob rau hauv kev sib cuag nrog dej, cov tshuaj tiv thaiv hydration yuav pib, thiab cov tshuaj calcium hydroxide yuav sai sai saturated thiab crystallize. Ib txhij, ettringite crystals thiab calcium silicate hydrate gels yog tsim. Cov khoom uas tau muab tso rau ntawm cov gel thiab cov cement uas tsis muaj dej. Raws li cov tshuaj tiv thaiv hydration nce ntxiv, thiab cov polymer hais ntxiv hauv cov capillary txheej, sib sau ua ib qho hluav taws xob tas li, kev ua kom huv si thiab tsis muaj qab hau. Lub aggregated polymer hais maj mam sau lub pores.

Redispersible latex hmoov tuaj yeem txhim kho qhov khoov lub zog thiab kev sib txuas lub zog ntawm mortar vim nws tuaj yeem tsim ib zaj duab xis polymer rau ntawm qhov chaw ntawm cov khoom khib nyiab. Muaj cov pores nyob rau saum npoo ntawm zaj duab xis, thiab qhov chaw ntawm lub qhov hws yog ntim nrog mortar, uas txo cov kev ntxhov siab concentration. Thiab nws yuav so tsis tau tawg nyob rau hauv qhov kev txiav txim ntawm sab nraud quab yuam. Tsis tas li ntawd, cov mortar tsim cov pob txha txha caj qaum tom qab cov cement yog hydrated, thiab cov polymer nyob rau hauv lub cev pob txha muaj kev ua haujlwm ntawm cov pob qij txha txav tau, zoo ib yam li cov ntaub so ntswg ntawm tib neeg lub cev. Cov membrane tsim los ntawm cov polymer tuaj yeem muab piv rau cov pob qij txha thiab ligaments, yog li ua kom cov elasticity thiab yooj ntawm cov pob txha pob txha.

Nyob rau hauv lub polymer-hloov cement mortar system, qhov nruam thiab ua tiav polymer zaj duab xis yog interwoven nrog cov cement paste thiab xuab zeb hais, ua rau tag nrho cov mortar finer, thiab nyob rau tib lub sij hawm ua rau tag nrho cov elastic network los ntawm txhaws capillaries thiab kab noj hniav. Yog li ntawd, cov yeeb yaj kiab polymer tuaj yeem xa cov siab thiab elastic nro. Cov yeeb yaj kiab polymer tuaj yeem txuas cov kab nrib pleb ntawm qhov sib txuas ntawm polymer-mortar, kho cov kab nrib pleb, thiab txhim kho kev sib khi thiab kev sib txuas ntawm cov tshuaj khib nyiab. Lub xub ntiag ntawm cov hloov pauv tau yooj yim thiab muaj zog heev ntawm cov khoom siv polymer ua rau muaj kev ywj pheej thiab elasticity ntawm mortar, muab cohesion thiab dynamic zog rau lub cev pob txha. Thaum siv lub zog sab nraud, cov txheej txheem kev loj hlob ntawm microcrack yog ncua kom txog thaum muaj kev ntxhov siab ntau dua vim tias muaj zog ntxiv thiab elasticity. Lub interwoven polymer domains kuj ua raws li ib tug barrier rau microcracks rau merge rau hauv cov kab nrib pleb. Yog li ntawd, lub redispersible polymer hmoov tsub kom qhov tsis ua hauj lwm kev nyuaj siab thiab tsis ua hauj lwm strain ntawm cov khoom.