Cellulose ethers rudzi rwemakemikari e organic polymer akagadziriswa kubva ku cellulose yechisikigo. Anowanzoshandiswa mukuvaka, kunyanya muzvinhu zvakagadzirwa nesimende. Simba re cellulose ether pakuita kwe hydration yesimende rinonyanya kuratidzwa muzvinhu zvinotevera: kupararira kwezvikamu zvesimende, kuchengetedza mvura, kukora, uye simba rekugadzirwa kwezvigadzirwa zve hydration yesimende.
1. Nhanganyaya yekunyorovesa simende
Maitiro ekunyorovesa simende inyaya yemaitiro akaomarara emuviri nemakemikari pakati pesimende nemvura. Maitiro aya anoita kuti simende iome zvishoma nezvishoma kuti igadzire chimiro chakasimba, zvichizopedzisira zvagadzira zvigadzirwa zvekunyorovesa zvakaita secalcium silicate hydrate (CSH) necalcium hydroxide (CH). Munguva iyi, mwero wekunyorovesa simende, kunyorovesa uye kuchengetwa kwemvura kweslurry, uye kuumbwa kwezvigadzirwa zvekunyorovesa zvinokanganisa zvakananga simba nekugara kwenguva refu kwekongiri yekupedzisira.
2. Maitiro ekuita kwe cellulose ethers
Cellulose ether ine basa guru rekutonga zvinhu zvemuviri uye zvemakemikari mukuita kwemvura yesimende. Cellulose ether inonyanya kukanganisa maitiro emvura yesimende nenzira mbiri: imwe inokanganisa kupararira uye kubuda kwemvura mu slurry yesimende; imwe inokanganisa kupararira uye kuomeswa kwezvikamu zvesimende.
Kudzora hunyoro uye kuchengetedza mvura
Cellulose ethers inogona kuvandudza zvakanyanya kuchengetwa kwemvura kwezvinhu zvakagadzirwa nesimende. Nekuda kwesimba rayo remvura, cellulose ether inogona kugadzira mhinduro yakasimba yecolloidal mumvura, iyo inogona kunyudza nekuchengetedza hunyoro. Kugona uku kubata mvura kwakakosha mukuderedza kuputika kunokonzerwa nekurasikirwa nekukurumidza kwemvura mukongiri panguva yekutanga kwemvura. Kunyanya munzvimbo dzakaoma kana mamiriro ekuvaka anopisa zvakanyanya, cellulose ether inogona kudzivirira mvura kuti isapwanye nekukurumidza uye kuve nechokwadi chekuti huwandu hwemvura mukongiri yesimende hwakakwana kutsigira maitiro emvura akajairika.
Rheology uye Kukora
Cellulose ethers inogonawo kuvandudza rheology ye slurry yesimende. Mushure mekuwedzera cellulose ether, kuenderana kwe slurry yesimende kuchawedzera zvakanyanya. Izvi zvinonyanya kukonzerwa nechimiro chechain refu chinoumbwa nemamorekuru e cellulose ether mumvura. Iyi molecule refu-chain inogona kudzikamisa kufamba kwezvikamu zvesimende, nokudaro ichiwedzera viscosity uye kugadzikana kweslurry. Hunhu uhwu hwakakosha zvakanyanya mukushandiswa kwakadai sekupurasita nematiles, sezvo ichidzivirira simende kuti isayerere nekukurumidza uku ichipa mashandiro ari nani ekuvaka.
Kunonoka kunyorova uye kugadzirisa nguva yekuisa mvura
Cellulose ether inogona kunonotsa kunyorova kwesimbi uye kuwedzera kurongeka kwekutanga uye nguva yekupedzisira yekurongeka kwesimbi. Izvi zvinoitika nekuti mamorekuru e cellulose ether anonamirwa pamusoro pesimbi dzesimende, zvichiita chipingamupinyi chinodzivirira kusangana zvakananga pakati pemvura nesimbi dzesimende, nokudaro zvichideredza kunyorova kwesimbi. Nekunonotsa nguva yekurongeka, cellulose ethers inogona kuvandudza mashandiro ekuvaka, zvichipa vashandi vekuvaka nguva yakawanda yekugadzirisa nekugadzirisa.
3. Mhedzisiro pamhando yezvigadzirwa zvemvura zvesimende
Kuvapo kwe cellulose ethers kunokanganisawo magadzirirwo ezvigadzirwa zve cement hydration. Zvidzidzo zvakaratidza kuti chimiro che calcium silicate hydrate (CSH) gel chichachinja mushure mekuwedzera cellulose ether. Mamorekuru e cellulose ether anogona kukanganisa chimiro che crystal cheCSH, zvichiita kuti chive chakasununguka. Chimiro ichi chakasununguka chinogona kuderedza simba rekutanga kusvika pamwero wakati, asi chinobatsirawo kuvandudza kusimba kwechinhu chacho.
Cellulose ethers inogonawo kuderedza kuumbwa kwe ettringite panguva yekunyoroveswa kwemvura. Sezvo cellulose ether ichidzora mwero wekunyoroveswa kwemvura, mwero wekuumbwa kwe ettringite mu simende unodzikira, nokudaro zvichideredza kushushikana kwemukati kunokonzerwa nekuwedzera kwehuwandu panguva yekunyoroveswa kwemvura.
4. Mhedzisiro pakukura kwesimba
Cellulose ethers inewo simba guru pakukura kwesimba rezvinhu zvakagadzirwa nesimende. Nekuti cellulose ethers inoderedza mwero wemvura inoyerera yesimende, kukura kwesimba rekutanga kwemasimende kunowanzo kunonoka. Zvisinei, sezvo hydration reaction ichienderera mberi, mhedzisiro inotonga yekuchengetedza mvura ye cellulose ether uye hydration product morphology inogona kubuda zvishoma nezvishoma, izvo zvichabatsira kuvandudza simba racho padanho rekupedzisira.
Zvinofanira kucherechedzwa kuti huwandu hwakawedzerwa uye rudzi rwe cellulose ether zvine simba rakapetwa kaviri pakusimba. Huwandu hwakakodzera hwe cellulose ether hunogona kuvandudza mashandiro ekuvaka uye kuwedzera simba rekupedzisira, asi kushandiswa zvakanyanya kunogona kutungamira kudzikira kwesimba rekutanga rezvinhu zvakagadzirwa nesimende uye kukanganisa hunhu hwekupedzisira hwemakanika. Saka, mukushandiswa kunoshanda, mhando uye chiyero che cellulose ether zvinofanirwa kugadziriswa uye kugadzirwa zvinoenderana nezvinodiwa zveinjiniya.
Cellulose ether inokanganisa maitiro ekunyorovesa mvura uye hunhu hwesimende nekuvandudza kuchengetwa kwemvura kwezvinhu zvakagadzirwa nesimende, kugadzirisa mwero wemvura, uye kukanganisa chimiro chezvigadzirwa zvemvura. Kunyangwe cellulose ethers dzichigona kukonzera kurasikirwa nesimba rekutanga, dzinogona kuvandudza kugara kwenguva refu uye kusimba kwekongiri kwenguva refu. Kuwedzerwa kwecellulose ether kunogonawo kuvandudza mashandiro ekuvaka, kunyanya mumamiriro ekushandiswa anoda nguva refu yekushanda uye zvinodiwa zvakanyanya zvekuchengetedza mvura. Ine mabhenefiti asingatsiviwi. Mukushandiswa chaiko kweinjiniya, kusarudza zvine musoro kwerudzi uye chiyero che cellulose ether kunogona kuenzana simba, mashandiro ekuvaka uye zvinodiwa zvekugara kwenguva refu zvezvinhu.
Nguva yekutumira: Gunyana-27-2024