Hydroxypropyl methylcellulose (HPMC), seimwe yezvinowedzerwa zve organic polymer zvinoshandiswa zvakanyanya muzvinhu zvakagadzirwa nesimende, inonyanya kushanda kuvandudza kushanda, kuchengetedza mvura, uye kunamira kwedhaka kana kongiri. Zvisinei, se hydrophilic polymer, HPMC inokanganisawo maitiro emvura uye magadzirirwo esimende kusvika padanho rakasiyana, nokudaro ichikanganisa zvakanyanya hunhu hwechinhu chakaoma. Tsvagiridzo yakadzama mukushanda kwayo inobatsira kudzora zvakanyanya sainzi chiyero chayo mukushandiswa kweinjiniya, kuvandudza kugadzikana kwesystem uye simba rekupedzisira.
1.Kukanganiswa kwakanyanya kweHPMC pakunyungudutsa simende kunobva mukuchengetwa kwayo kwemvura. Kunyungudutsa simende kunoda mvura yakakwana, asi panguva yekugadzirira dhaka, nekuda kwezvinhu zvakaita sekunyungudutsa mvura uye kubuda kwemvura kubva pasi pevhu, mvura inogona kurasika nekukurumidza, zvichikonzera kunyungudutsa kusina kukwana. HPMC, nekugadzira chimiro che network chakasimba chine mativi matatu, inowedzera viscosity uye kugona kubata mvura kweslurry, ichichengetedza mvura mukati mesystem uye inononoka kufamba kwemvura yakasununguka. Maitiro aya akaenzana ne "kunonoka kwemvura." Naizvozvo, HPMC inogona kunonoka mwero wemvura muzvikamu zvekutanga, asi inoramba ichipa hunyoro kune zvidimbu zvesimende, zvichibvumira kunyungudutsa kwakakwana muzvikamu zvepakati nepashure, nokudaro ichivandudza huwandu hwechimiro.
2.Simba reHPMC pamaitiro epamusoro pezvikamu zvesimende rinodzorawo maitiro emvura inoyerera pamusoro. Mushure mekuzvimba, HPMC inoumba firimu rakatetepa, rakanyungudika zvishoma pamusoro pezvikamu zvesimende, zvichidzivisa nzira yemvura inoyerera. Kuvapo kwefirimu yakanyungudika kunononotsa kusangana kwekutanga pakati pezvicherwa zvakaita seC3S neC2S nemvura, zvichikonzera nguva yakareba yekupinza uye kunonoka kwemvura inoyerera. Izvi zvinotsanangura kuti nei mamortar ane HPMC achiwanzoratidza nguva refu yekugadzika. Uyezve, HPMC ine madhigirii ekuchinja akakwira kana kuti viscosity yakakwira ine simba rakasimba rekunyungudika uye ine simba guru pakunyungudika.
3.HPMC inowedzera kusimba kwemuchina, ichideredza kuyerera kwe simende uye ichikanganisa kufamba uye kushanduka kwe crystallization kwezvigadzirwa zve hydration. Kusimba kwakanyanya kunoderedza nzvimbo yekukura kwekristaro, zvichikonzera CSH gel uye Ca(OH)₂ crystals yakapfava, zvichikurudzira structural homogenization. Kunyangwe simba rekutanga richigona kudzikira, simba rekupedzisira rinovandudzika nekuda kwekuwedzera kusimba kwemvura uye kudzikira kwe capillary porosity.
4.Kana tichitaura nezve microstructure, kuwedzerwa kweHPMC kunoita kuti pave ne network densive network yezvigadzirwa zve hydration. Inogona kuumba kusasimba kwe physical adsorption ne CSH gel, zvichivandudza interfacial adhesion uye kuderedza porosity. Dzimwe ongororo dzinoratidza kuti, kana paine huwandu hwakakodzera, HPMC inogona kugadzirisa structure defects mu interfacial transition zone (ITZ), zvichiwedzera kusimba kwese uye kuramba kutsemuka kwemortar.
5.Mhedzisiro yeHPMC pakunyorovesa simende ine mativi maviri. Kuwedzera zvakanyanya kunogona kunonotsa kunyorovesa, zvichikonzera kudzikira kwakanyanya kwesimba rekutanga; panguva imwe chete, kuwedzera kwehuwandu hwezvinhu zvakasikwa kunogona kuderedza kuramba kupisa kwakanyanya kwezvinhu zvinosimbisa simende. Nokudaro, chiyero chinofanira kudzorwa zvine musoro zvichienderana nerudzi rwemota, rudzi rwezvinhu zvinosimbisa simende, uye mamiriro ekuvaka. Semuenzaniso, muzvinhu zvekuvaka zvine zvidimbu zvitete zvakaita setiles adhesive neputty powder, kuchengetedza mvura kweHPMC uye kunonoka kwenguva zvinobatsira; zvisinei, mumota dzekugadzirisa dzinoda simba rekutanga, viscosity uye addition ratio dzinofanira kusarudzwa nokungwarira.
6. HPMCKukanganiswa kwemvura inoyerera nesimende kunonyanya kuratidzwa muzvikamu zvitatu: kunonoka kuyerera kwemvura uye kukurudzira maitiro ekupedzisira kuburikidza nekuchengetedza mvura; kuwedzera nguva yekupinza mvura kuburikidza nekunyungudutsa; uye kushandura chimiro uye chimiro chezvigadzirwa zvekunyungudutsa mvura nekuwedzera viscosity. Kudzora zvine mwero kwerudzi uye chiyero cheHPMC kunogona kuvandudza mashandiro emota uku uchidzivirira kukanganiswa kwakanyanya pasimba rekutanga, zvichiita kuti pave nekuenzana kwakakwana pakati pekushanda zvakanaka uye hunhu hwemakanika.
Nguva yekutumira: Mbudzi-17-2025