Iyo yakasanganiswa ine mhedzisiro yakanaka pakuvandudza mashandiro ekuvaka yakaoma-yakasanganiswa dhaka, uye redispersible rubber poda inogadzirwa neakakosha emulsion yepolymer mushure mekupfapfaidza kuomeswa. Iyo yakaomeswa rabha poda ndezvimwe zvidimbu zvakatenderera 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. Rubber poda inoshandiswa mudhaka inogona kuvandudza kupikisa, kusimba, kupfeka kuramba, kusununguka kwekuvaka, simba rekubatanidza uye kubatana, kuramba kwemamiriro ekunze, kutonhora-kunyungudika, kudzoreredza kwemvura, simba rekukotama uye kusimba kwedhaka. Chero bedzi simenti-yakavakirwa zvinhu nelatex poda iri kusangana nemvura, iyo hydration reaction ichatanga, uye iyo calcium hydroxide solution ichakurumidza kuzara uye makristasi achanaya. Panguva imwecheteyo, ettringite makristasi uye calcium silicate hydrate gels ichaumbwa. Izvo zvimedu zvakasimba zvinoiswa pajeri uye unhydrated sement particles. Sezvo hydration reaction inofambira mberi, zvigadzirwa zve hydration zvinowedzera, uye zvimedu zvepolymer zvishoma nezvishoma zvinoungana mu capillary 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 simba rekukotama uye kusimba kwekunamatira kwedhaka nekuti inogona kugadzira firimu repolymer pamusoro pezvimedu zvedhaka. 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 rinofamba, iro rakafanana nenyama yemuviri wemunhu. Iyo membrane inoumbwa nepolymer inogona kufananidzwa nemajoini nemarunda, kuitira kuti ive nechokwadi chekusimba uye kuchinjika kweakaomarara skeleton. kuoma.
Mune iyo polymer-yakagadziridzwa simende dhaka sisitimu, inoenderera uye yakazara yepolymer firimu inorukwa nesamende paste uye jecha zvidimbu, 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. Kuvepo 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: Feb-20-2023