Idethi Yokuthumela: 20, Jun, 2022

3. Indlela yokusebenza yama-superplasticizers

Indlela ye-ejenti yokunciphisa amanzi yokuthuthukisa uketshezi lwengxube kakhonkolo ikakhulukazi ihlanganisa umphumela wokuhlakaza kanye nomphumela wokugcoba. I-ejenti yokunciphisa amanzi empeleni iyi-surfactant, enye ingxenye yochungechunge olude lwamangqamuzana luncibilika kalula emanzini - iqembu le-hydrophilic, kanti elinye ekugcineni alincibiliki emanzini - iqembu le-hydrophobic.

a. Ukuhlakazeka: Ngemva kokuba usimende uxutshwe namanzi, ngenxa yokukhanga kwamangqamuzana ezinhlayiya zikasimende, udaka lukasimende lwakha isakhiwo se-flocculation, ukuze u-10% kuya ku-30% wamanzi okuxuba ahlanganiswe ezinhlayiyeni zikasimende futhi angakwazi ukuhlanganyela mahhala. ukugeleza kanye nokugcoba. umphumela, ngaleyo ndlela kuthinte uketshezi lwengxube kakhonkolo. Lapho i-ejenti yokunciphisa amanzi yengezwa, ngenxa yokuthi ama-athomu e-ejenti yokunciphisa amanzi angakhangiswa ngendlela eqondile ebusweni bezinhlayiya zikasimende, ingaphezulu lezinhlayiya zikasimende linenkokhelo efanayo (imvamisa ukushaja okungekuhle), okwenza umphumela we-electrostatic repulsion, okuyinto ikhuthaza ukuhlakazeka kwezinhlayiya zikasimende kanye nokubhujiswa kwesakhiwo se-flocculation. , khulula ingxenye egoqiwe yamanzi futhi uhlanganyele ekugelezeni, ngaleyo ndlela ukwandisa ngokuphumelelayo uketshezi lwengxube yekhonkrithi.

b. Ukugcoba: iqembu le-hydrophilic ku-superplasticizer li-polar kakhulu, ngakho-ke ifilimu ye-adsorption ye-superplasticizer ebusweni bezinhlayiya ze-cement ingakha ifilimu lamanzi elincibilikisiwe elizinzile elinama-molecule amanzi, futhi le filimu yamanzi ine-Lubrication enhle inganciphisa ngempumelelo ukushelela. ukumelana phakathi kwezinhlayiya zikasimende, ngaleyo ndlela kuthuthukiswe uketshezi lukakhonkolo.

Umthelela wesinciphisi samanzi kukhonkolo, njll.:

a. Setha isikhathi. Ama-superplasticizer ngokuvamile awanawo umphumela wokuhlehlisa, futhi angase akhuthaze ngisho nokufakwa kwamanzi kanye nokuqina kukasimende. I-superplasticizer ehlehlisiwe iyinhlanganisela ye-superplasticizer ne-retarder. Ngaphansi kwezimo ezijwayelekile, ukuze kubambezeleke ukugeleza kukasimende futhi kuncishiswe ukulahlekelwa kwe-slump, inani elithile le-retarder lengezwa ku-ejenti yokunciphisa amanzi.

b. Okuqukethwe kwegesi. Njengamanje, i-polycarboxylate water reducer evame ukusetshenziswa inokuqukethwe okuthile komoya, futhi okuqukethwe komoya wekhonkrithi akufanele kube phezulu kakhulu, ngaphandle kwalokho amandla okhonkolo azoncishiswa kakhulu.

c. Ukugcinwa kwamanzi.

Ama-Superplasticizer awafaki isandla kakhulu ekwehliseni ukopha kukakhonkolo, futhi angase andise nokopha. Ukopha okukhonkolo kuyanda lapho umthamo udlulele.