Umhla wokuThunyelwa: 20, Jun, 2022

3. Indlela yokusebenza ye-superplasticizers

Indlela yokunciphisa amanzi yokuphucula i-fluidity yomxube wekhonkrithi ikakhulu ibandakanya umphumo wokusabalalisa kunye nefuthe lokuthambisa. I-arhente yokunciphisa amanzi eneneni i-surfactant, enye isiphelo setsheyina elide le-molecular linyibilika ngokulula emanzini - iqela le-hydrophilic, kwaye elinye isiphelo alinakunyibilika emanzini - iqela le-hydrophobic.

a. Ukusabalalisa: Emva kokuba i-samente ixutywe namanzi, ngenxa yokutsalwa kwe-molecular ye-cement particles, i-cement slurry yenza isakhiwo se-flocculation, ukwenzela ukuba i-10% ukuya kwi-30% yamanzi okuxuba ihlanganiswe kwiincinci ze-samente kwaye ayikwazi ukuthatha inxaxheba ngokukhululekile. ukuhamba kunye nokuthambisa. isiphumo, ngaloo ndlela echaphazela fluidity umxube eziphathekayo. Xa i-arhente yokunciphisa amanzi yongezwa, ngenxa yokuba i-athomu ye-agent yokunciphisa amanzi iyakwazi ukubhengezwa kwinqanaba leengqungquthela ze-samente, umphezulu weengqungquthela zesamente unentlawulo efanayo (ngokuqhelekileyo intlawulo engalunganga), yenze i-electrostatic repulsion effect, leyo ikhuthaza ukusasazeka kweengqungquthela zesamente kunye nokutshatyalaliswa kwesakhiwo se-flocculation. , ukukhulula inxalenye esongiweyo yamanzi kwaye uthathe inxaxheba ekuhambeni, ngaloo ndlela ukwandisa ngokufanelekileyo umbane womxube wekhonkrithi.

b. I-Lubrication: iqela le-hydrophilic kwi-superplasticizer i-polar kakhulu, ngoko ifilimu ye-adsorption ye-superplasticizer kumphezulu wamasuntswana e-samente inokwenza ifilimu ezinzileyo yamanzi anyibilikisiweyo kunye neemolekyuli zamanzi, kwaye le filimu yamanzi ine-Lubrication enhle inokunciphisa ngokufanelekileyo i-sliding. ukuchasana phakathi kwamasuntswana e-samente, ngaloo ndlela kuphuculwe ngakumbi ubumanzi bekhonkrithi.

Isiphumo sesinciphisi samanzi kwikhonkrithi, njl.

a. Seta ixesha. Ii-superplasticizers ngokubanzi azinasiphumo sokulibazisa, kwaye zinokukhuthaza ukufakwa kwamanzi kunye nokuqina kwesamente. I-superplasticizer ehlehlisiwe yi-composite ye-superplasticizer kunye ne-retarder. Ngaphantsi kweemeko eziqhelekileyo, ukwenzela ukulibazisa i-hydration ye-samente kunye nokunciphisa ukulahlekelwa kwe-slump, inani elithile le-retarder liyongezwa kwi-arhente yokunciphisa amanzi.

b. Umxholo werhasi. Okwangoku, i-polycarboxylate yokunciphisa amanzi esetyenziswa ngokuqhelekileyo inomlinganiselo othile womoya, kwaye umxholo womoya wekhonkrithi akufanele ube phezulu kakhulu, ngaphandle koko amandla ekhonkrithi aya kuncitshiswa kakhulu.

c. Ukugcinwa kwamanzi.

Ii-Superplasticizers azinagalelo lininzi ekunciphiseni ukopha kwekhonkrithi, kwaye zinokunyusa ukopha. Ukopha ngekhonkrithi kuyanda xa idosi igqithise.