Cellulose ether inononoka hydration ye simenti kune zvidimbu zvakasiyana, izvo zvinoratidzwa mukunonoka kuumbwa kwe ettringite, CSH gel uye calcium hydroxide. Parizvino, iyo mashandiro e cellulose ether inononoka simende hydration inonyanya kusanganisira fungidziro yekuvharirwa ion kufamba, alkali degradation uye adsorption.
1. Hypothesis yekuvharirwa ion kufamba
Zvinofungidzirwa kuti cellulose ethers inowedzera viscosity yepore solution, ichitadzisa chiyero chekufamba kweion, nekudaro kunonotsa simende hydration. Zvisinei, mukuedza uku, cellulose ether ine viscosity yakaderera ine simba rakasimba rekunonoka simende hydration, saka iyi hypothesis haibati. Muchokwadi, nguva yekufamba kweion kana kutama ipfupi kwazvo, izvo zviri pachena zvisingaenzaniswi nenguva yekunonoka kwesamende hydration.
2. Alkaline degradation
Polysaccharides inowanzo kuderedzwa zviri nyore pasi pemamiriro ealkaline kuita hydroxycarboxylic acids inononoka simende hydration. Naizvozvo, chikonzero nei cellulose ether inonotsa simende hydration inogona kunge inoshatisa mu alkaline simende slurry kuti iite hydroxycarboxylic acids, asi chidzidzo chakawana kuti Cellulose ether yakagadzikana kwazvo pasi pemamiriro ealkaline, yakangoshatiswa zvishoma, uye zvigadzirwa zvakaderedzwa hazvina chazvinoita. pakunonoka kwe simenti hydration.
3. Adsorption
Adsorption inogona kunge iri chikonzero chaicho chinoita kuti cellulose ether inonoke simende hydration. Mazhinji organic additives anoshambadza kune simende zvimedu uye hydration zvigadzirwa, kudzivirira kunyungudika kwemasimende uye crystallization yezvigadzirwa zve hydration, nekudaro kunonoka hydration uye kuseta simende. Zvakaonekwa kuti cellulose ether inoiswa nyore nyore kune calcium hydroxide, C. S. Pamusoro pezvigadzirwa zve hydration senge H gel uye calcium aluminate hydrate, asi hazvisi nyore kushambadzwa ne ettringite uye isina mvura chikamu. Uyezve, maererano ne cellulose ether, iyo adsorption simba reHEC yakasimba kudarika iyo yeMC, uye yakaderera iyo hydroxyethyl muHEC kana hydroxypropyl muHPMC, iyo yakasimba iyo adsorption kugona ndeye: maererano ne hydration zvigadzirwa, hydrogen. Iko adsorption kugona kwecalcium oxide C. S. Iyo adsorption kugona kweH yakasimba. Kumwe kuongorora kunoratidzawo kuti adsorption kugona ye hydration zvigadzirwa uye cellulose ether ine hukama hunoenderana nekunonoka kwe simenti hydration: kusimba kwe adsorption, kunonoka kunova pachena, asi adsorption ye ettringite kune cellulose ether haina kusimba, asi kuumbwa kwayo. yakanonoka zvakanyanya. Zvidzidzo zvakaratidzawo kuti cellulose ether ine adsorption yakasimba pane tricalcium silicate uye yayo hydration zvigadzirwa, nokudaro zvakanyanya kunonoka hydration ye silicate phase, uye ine yakaderera adsorption kune ettringite, asi kuumbwa kwe ettringite kunorambidzwa. Zviri pachena kuti kunonoka, izvi ndezvokuti kunonoka kuumbwa kwe ettringite kunokonzerwa neCa2 + chiyero mune mhinduro, iyo inoenderera mberi kwekunonoka silicate hydration ye cellulose ether.
Mumigumisiro yekuedza, kukwanisa kunonoka kweHEC kwakasimba kudarika kweMC, uye kukwanisa kwe cellulose ether kunonoka kuumbwa kwe calcium hydroxide yakasimba kudarika yeC C. S. Kugona kweH gel uye ettringite kwakasimba, iyo ine hukama hunoenderana neiyo adsorption kugona kwe cellulose ether uye simende hydration zvigadzirwa. Izvo zvakare zvinosimbiswa kuti adsorption inogona kunge iri chikonzero chaicho nei cellulose ether inonoke simende hydration, uye cellulose ether uye simende hydration zvigadzirwa zvine hukama hunoenderana. Iyo yakasimba iyo adsorption kugona kwesimende hydration zvigadzirwa, zvakanyanya kujeka kuumbwa kwekunonoka hydration zvigadzirwa. Mhedzisiro yapfuura yekuedzwa inoratidza kuti akasiyana cellulose ethers ane akasiyana mhedzisiro paPortland simende hydration kunonoka, uye imwechete cellulose ether ine akasiyana kunonoka mhedzisiro pane akasiyana hydration zvigadzirwa, izvo zvinoratidza kuti Portland simende hydration zvigadzirwa zvine mhedzisiro dzakasiyana pane fiber. Iyo adsorption ye cellulose ether inosarudza, uye adsorption ye cellulose ether kune simende hydration zvigadzirwa zvakare inosarudza.
Nguva yekutumira: Feb-27-2023