Redispersible latex hmoov tuaj yeem txhim kho cov khoom ntawm mortar xws li flexural zog thiab adhesion lub zog, vim tias nws tuaj yeem tsim ib zaj duab xis polymer rau ntawm qhov chaw mortar.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 nyob rau hauv qhov kev txiav txim ntawm sab nraud quab yuam, nws yuav tsim kev so tsis muaj kev tawg.Tsis tas li ntawd, cov mortar tsim ib lub cev pob txha nruj tom qab cov cement yog hydrated, thiab cov polymer nyob rau hauv lub pob txha pob txha muaj kev ua haujlwm ntawm lub cev txav tau, uas zoo ib yam li cov ntaub so ntswg ntawm tib neeg lub cev.Lub membrane tsim los ntawm cov polymer tuaj yeem muab piv rau cov pob qij txha thiab ligaments, thiaj li ua kom lub elasticity thiab yooj ntawm cov pob txha pob txha.tawv.
Nyob rau hauv lub polymer-hloov cement mortar system, qhov nruam thiab ua tiav polymer zaj duab xis yog interwoven nrog cement paste thiab xuab zeb hais, ua rau tag nrho cov mortar finer thiab denser, 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 lub sealing thiab cohesive zog ntawm mortar.Lub xub ntiag ntawm cov hloov pauv tau yooj yim thiab muaj zog heev ntawm cov khoom siv polymer txhim kho qhov hloov tau yooj yim thiab elasticity ntawm cov mortar, muab kev sib koom ua ke thiab kev coj cwj pwm zoo rau lub cev pob txha.Thaum siv cov quab yuam sab nraud, cov txheej txheem microcrack propagation yog ncua vim kev txhim kho yooj thiab elasticity kom txog thaum muaj kev ntxhov siab ntau dua.Lub interwoven polymer domains kuj ua raws li ib tug barrier rau lub coalescence ntawm microcracks rau nkag mus rau hauv cov kab nrib pleb.Yog li ntawd, cov respersible polymer hmoov txhim kho qhov tsis ua hauj lwm kev nyuaj siab thiab tsis ua hauj lwm strain ntawm cov khoom.
Ntxiv cov hmoov latex rau cov cement mortar yuav tsim ib qho kev hloov pauv tau yooj yim thiab elastic polymer network zaj duab xis, uas yuav txhim kho qhov kev ua tau zoo ntawm cov mortar, tshwj xeeb tshaj yog lub zog tensile ntawm lub mortar yuav zoo tuaj.Thaum siv lub zog sab nraud, vim yog kev txhim kho ntawm tag nrho cov cohesion ntawm mortar thiab soft elasticity ntawm cov polymer, qhov tshwm sim ntawm micro-cracks yuav offset los yog qeeb.Los ntawm kev cuam tshuam ntawm latexr hmoov cov ntsiab lus ntawm lub zog ntawm thermal rwb thaiv tsev mortar, nws pom tias tensile daim ntawv cog lus lub zog ntawm thermal rwb thaiv tsev mortar nce nrog nce latex hmoov cov ntsiab lus;lub zog flexural thiab compressive zog muaj ib qho kev kawm nrog qhov nce ntawm latex hmoov cov ntsiab lus.Lub degree ntawm kev poob qis, tab sis tseem ua tau raws li qhov yuav tsum tau ua ntawm phab ntsa sab nrauv tiav.
Cov cement mortar tov nrog latex hmoov, nws 28d bonding zog nce nrog nce latex hmoov cov ntsiab lus.Nrog rau qhov nce ntawm cov hmoov latex cov ntsiab lus, lub peev xwm sib txuas ntawm cov cement mortar thiab qub cement pob zeb saum npoo yog txhim kho, uas ua kom nws qhov zoo rau kev kho cov cement pob zeb thiab lwm yam qauv.Ntxiv mus, qhov folding piv ntawm mortar nce nrog qhov nce ntawm latex hmoov cov ntsiab lus, thiab qhov yooj yim ntawm qhov chaw mortar txhim kho.Nyob rau tib lub sijhawm, nws kuj tau pom tias nrog kev nce ntawm latex hmoov cov ntsiab lus, elastic modulus ntawm mortar txo qis ua ntej thiab tom qab ntawd nce.Ntawm tag nrho, nrog rau qhov nce ntawm cov tshauv tsub zuj zuj piv, cov elastic modulus thiab deformation modulus ntawm mortar yog qis dua cov mortar zoo tib yam.
Post lub sij hawm: Mar-14-2023