Hydroxypropyl methylcellulose (HPMC) inonyanya kuita basa rekuchengetedza mvura, kukora uye kuvandudza mashandiro ekuvaka musimende, gypsum uye zvimwe zvinhu zvehupfu. Kuita kwakanakisa kwekuchengetedza mvura kunogona kudzivirira zvinobudirira hupfu kubva pakuoma uye kuputika nekuda kwekurasikirwa kwemvura yakawandisa, uye kuita kuti hupfu huve nenguva yakareba yekuvaka.
Ita kusarudzwa kwezvinhu zvecementitious, aggregates, aggregates, kuchengetedza mvura, mabhandi, magadzirirwo ekugadzirisa kwekuvaka, nezvimwewo. Semuenzaniso, gypsum-based mortar ine bhondi yekushanda iri nani pane simende-based mortar munzvimbo yakaoma, asi kushanda kwayo kwekubatana kunoderera nokukurumidza pasi pemamiriro ekunyorova kwemvura uye kunwa kwemvura. Iyo inonangwa yekubatanidza kusimba kwedhaka rekupurasita inofanira kuderedzwa dhizaini neyakagadzika, ndiko kuti, simba rekubatanidza pakati pechigadziko chegadziko uye interface yekurapa mumiriri ≥ simba rekubatanidza pakati pechigadziko chedhaka redhaka uye interface yekurapa mumiririri ≥ chisungo pakati pechigadziko chedhaka redhaka uye pamusoro pevhu redhaka Simba ≥ simba rekubatanidza pakati pevhu revhu uye putty zvinhu.
Chinangwa chakanaka che hydration chesimende dhaka pachigadziko ndechekuti simende hydration chigadzirwa chinotora mvura pamwe chete nechigadziko, chinopinda munheyo, uye chinoumba "kiyi yekubatanidza" inoshanda nenheyo, kuitira kuti uwane simba rinodiwa rechisungo. Kudiridza zvakananga pamusoro pechigadziko kunokonzeresa kupararira kwakanyanya mumvura kunyura kwegasi nekuda kwekusiyana kwekushisa, nguva yekudiridza, uye kufanana kwekudiridza. Nheyo yacho ine mvura shoma uye icharamba ichitora mvura mudhaka. Pamberi pe simenti hydration ichienderera mberi, mvura inobatwa, iyo inokanganisa simenti hydration uye kupinda kwezvigadzirwa zve hydration mumatrix; chigadziko chine mvura yakakura, uye mvura iri mudhaka inoyerera ichienda pasi. Iyo yepakati yekutama kumhanya inononoka, uye kunyange mvura-yakapfuma layer inoumbwa pakati pedhaka uye matrix, iyo inokanganisawo kusimba kwechisungo. Naizvozvo, kushandisa yakajairwa base yekudiridza nzira haizongokundikana kugadzirisa zvinobudirira dambudziko rekunyura kwemvura yakakwira yemadziro emadziro, asi kuchakanganisa kusimba kwekubatanidza pakati pedhaka nechigadziko, zvichikonzera kuputika nekutsemuka.
Mhedzisiro ye cellulose ether pane compressive uye shear simba resamende dhaka.
Nekuwedzerwa kwe cellulose ether, simba rekumanikidzika uye shear rinoderera, nokuti cellulose ether inotora mvura uye inowedzera porosity.
Kuita kwekubatanidza uye kusimba kwekubatanidza kunoenderana nekuti iyo interface iri pakati pedhaka uye base zvinhu zvinogona kugadzikana uye zvinobudirira kuziva "kiyi yekubatanidza" kwenguva yakareba.
Zvinhu zvinokanganisa kusimba kwebhondi zvinosanganisira:
1. Mamiriro ekutorwa kwemvura uye roughness ye substrate interface.
2. Kukwanisa kuchengetedza mvura, simba rekupinda uye simba rekugadzira dhaka.
3. Zvishandiso zvekuvaka, nzira dzekuvaka uye nzvimbo yekuvaka.
Nekuti iyo base layer yekuvaka dhaka ine kumwe kunyura kwemvura, mushure mekunge chigadziko chatora mvura mudhaka, kuvakwa kwedhaka kunozodzikira, uye mumatambudziko akaomarara, simende iri mudhaka haizove yakazara hydrated, zvichikonzera kusimba, yakakosha. Mhinduro yechinyakare kumatambudziko aya ndeyekudiridza hwaro, asi hazvibviri kuve nechokwadi kuti chigadziko chakanyoroveswa.
Nguva yekutumira: May-06-2023