Post Date: 20 Jun, 2022

3. Iyo nzira yekuita kwe superplasticizers

Iyo meshini yemvura yekudzikisa mumiririri yekuvandudza fluidity yekongiri musanganiswa inonyanya kusanganisira dispersing maitiro uye lubricating maitiro. Mvura inoderedza mumiririri ndeyechokwadi surfactant, imwe mugumo werefu molecular cheni inonyungudika nyore mumvura - hydrophilic boka, uye imwe mugumo haigone kunyungudika mumvura - hydrophobic boka.

a. Kupararira: Mushure mekunge simende yakasanganiswa nemvura, nekuda kwekukwezva kwema molecular yemasimende, simende slurry inoumba chimiro che flocculation, kuitira kuti 10% kusvika 30% yemvura inosanganiswa yakaputirwa muzvikamu zvesimende uye haigoni kutora chikamu mukusununguka. kuyerera uye lubrication. mhedzisiro, nekudaro inokanganisa fluidity yemusanganiswa wekongiri. Kana iyo yekudzikisa mvura yawedzerwa, nekuti mvura inodzikisa ajenti mamorekuru anogona kufambiswa negwara pamusoro pezvikamu zvesimende, pamusoro pezvikamu zvesimende zvine mutero wakafanana (kazhinji kubhadharisa kwakashata), kuumba electrostatic repulsion effect, iyo. inokurudzira kupararira kwezvikamu zvesimenti uye kuparadzwa kwechimiro che flocculation. , kusunungura chikamu chakaputirwa chemvura uye kutora chikamu mukuyerera, nokudaro zvinobudirira kuwedzera fluidity yemusanganiswa wekrete.

b. Lubrication: boka re hydrophilic mu superplasticizer rakanyanya polar, saka iyo adsorption firimu ye superplasticizer iri pamusoro pemasimende zvidimbu zvinogona kugadzira yakagadzika yakanyungudutswa firimu remvura ine mamorekuru emvura, uye iyi firimu remvura rine yakanaka Lubrication inogona kunyatso kudzikisa kutsvedza. kupikisa pakati pemasimende, nekudaro kuwedzera kuvandudza fluidity yekongiri.

Mhedzisiro yekudzikisa mvura pane kongiri, nezvimwewo:

a. Ronga nguva. Superplasticizers kazhinji haina kudzoreredza mhedzisiro, uye inogona kutosimudzira iyo hydration uye kuomesa simende. Iyo yakadzoserwa superplasticizer inosanganiswa ye superplasticizer uye retarder. Mumamiriro ezvinhu akajairika, kuitira kunonoka hydration ye simenti uye kuderedza kurasikirwa kwekudonha, imwe chiyero che retarder inowedzerwa kune inoderedza mvura.

b. Gas content. Parizvino, iyo inowanzoshandiswa yepolycarboxylate mvura inoderedza ine imwe mhepo yemhepo, uye mhepo yekongiri haifaniri kunge yakanyanyisa, kana zvisina kudaro simba rekrete richaderedzwa zvikuru.

c. Kuchengetedza mvura.

Superplasticizers haibatsiri zvakanyanya mukudzikisa kubuda kwekongiri, uye inogona kutowedzera kubuda ropa. Kubuda ropa kwekongiri kunowedzera kana dosi yakawandisa.