Iyo admixture ine mhedzisiro yakanaka pakuvandudza kushanda kwekuvaka yakaoma-yakasanganiswa dhaka.Iyo redispersible latex poda inogadzirwa neakakosha emulsion yepolymer mushure mekupfapfaidza kuomesa.Iyo yakaomeswa latex poda ndeimwe spherical zvimedu zve80 ~ 100mm zvakaungana pamwechete.Izvi zvimedu zvinonyunguduka mumvura uye zvinoumba kupararira kwakagadzikana zvishoma kudarika emulsion particles yepakutanga, iyo inoumba firimu mushure mekushaya mvura uye kuoma.
Matanho ekugadzirisa akasiyana anoita kuti iyo redispersible latex poda ive nemhando dzakasiyana senge mvura yekudzivirira, alkali kuramba, kuramba mamiriro ekunze uye kuchinjika.latex poda inoshandiswa mudhaka inogona kuvandudza kupikisa, kusimba, kupfeka kuramba, kusununguka kwekuvaka, simba rekubatanidza uye kubatana, kuramba kwemamiriro ekunze, kutonhora-kunyungudika, kudzivirira mvura, simba rekukotama uye kusimba kwedhaka.Pangosvika simende-yakavakirwa zvinhu yakawedzerwa ne latex poda inosangana nemvura, iyo hydration reaction inotanga, uye iyo calcium hydroxide solution inokurumidza kusvika pakuzara uye makristasi anonaya, uye panguva imwe chete, ettringite makristasi uye calcium silicate hydrate gels inoumbwa.Izvo zvimedu zvakasimba zvinoiswa pajeri uye unhydrated sement particles.Sezvo hydration reaction inoenderera mberi, zvigadzirwa zve hydration zvinowedzera, uye zvimedu zvepolymer zvishoma nezvishoma zvinoungana mumacapillary pores, zvichigadzira dhizaini yakarongedzwa pamusoro peiyo gel uye pane isina mvura simende masimende.Iyo yakaunganidzwa yepolymer particles zvishoma nezvishoma inozadza pores.
Redispersible latex poda inogona kuvandudza zvimiro zvedhaka senge flexural simba uye kusimba kwekunamatira, nekuti inogona kugadzira polymer firimu pamusoro pevhu zvidimbu.Iko kune pores pamusoro pefirimu, uye pamusoro pemapores izere nedhaka, iyo inoderedza kushushikana kwepfungwa.Uye pasi pekuita kwesimba rekunze, inoburitsa kuzorora pasina kutyora.Pamusoro pezvo, dhaka rinoumba skeleton yakaoma mushure mekunge simenti yanyoroveswa, uye iyo polymer iri muskeleton ine basa rekubatana rinofambiswa, rakafanana nenyama yemuviri wemunhu.Iyo membrane inoumbwa nepolymer inogona kufananidzwa nemajoini nemarunda, kuitira kuti ive nechokwadi chekunyungudika uye kuchinjika kweiyo rigid skeleton.kuoma.
Mune iyo polymer-yakagadziridzwa simende dhaka sisitimu, inoenderera uye yakazara yepolymer firimu inorukwa nesamende paste uye jecha zvimedu, zvichiita kuti dhaka rose rive rakatsetseka uye denser, uye panguva imwechete ichiita iyo yese elastic network nekuzadza capillaries nemakomba.Naizvozvo, iyo polymer firimu inogona kunyatso fambisa kudzvanywa uye elastic tension.Iyo firimu repolymer rinogona kubhuroka kutsemuka kwe shrinkage papolymer-mortar interface, kuporesa kutsemuka kwakatsemuka, uye kugadzirisa chisimbiso uye kusimba kwakabatana kwedhaka.Kuvapo kweakanyanya kuchinjika uye akanyanya elastic polymer domains inovandudza kuchinjika uye elasticity yedhaka, ichipa kubatana uye ine simba maitiro kune yakaoma skeleton.Kana simba rekunze rikaiswa, iyo microcrack propagation process inononoka nekuda kwekuvandudzwa kuchinjika uye elasticity kusvika kushushikana kwakanyanya kwasvika.Iwo interwoven polymer domains anoitawo sechipinganidzo kukubatana kwe microcracks mumitswe inopinza.Naizvozvo, iyo redispersible polymer poda inovandudza kutadza kushushikana uye kutadza dhizaini yechinhu.
Nguva yekutumira: Mar-10-2023