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Umhla wokuThunyelwa: 13, Jun, 2022

I-Admixtures ibhekisela kwiklasi yezixhobo ezinokuphucula ngokufanelekileyo enye okanye ngaphezulu kweepropati zekhonkrithi. Umxholo wayo ngokuqhelekileyo ubala kuphela ngaphantsi kwe-5% yomxholo we-samente, kodwa unokuphucula kakhulu ukusebenza, amandla, ukuqina kwekhonkrithi okanye ukulungelelanisa ixesha lokumisela kunye nokugcina i-samente.

1. Ukuhlelwa kwemixube:

Imixube yekhonkrithi ihlelwa ngokubanzi ngokwemisebenzi yazo ephambili:

a. Izixube zokuphucula iimpawu ze-rheological zekhonkrithi. Kukho ubukhulu becala iarhente yokunciphisa amanzi, iarhente yokungenisa umoya, iarhente yokumpompa njalo njalo.

b. I-Admixtures yokulungelelanisa ukusetwa kunye neempawu ezilukhuni zekhonkrithi. Kukho ubukhulu becala ii-retarders, ii-accelerators, ii-arhente zamandla zakuqala, njl.

c. I-Admixtures yokulungelelanisa umxholo womoya wekhonkrithi. Kukho ubukhulu becala ii-agent zokungenisa umoya, ii-air-entraining agents, ii-foam agents, njl.

d. Imixube yokuphucula ukuqina kwekhonkrithi. Kukho ubukhulu becala i-air-entraining agents, ii-agent zokukhusela amanzi, i-rust inhibitors kunye nokunye.

e. Izixube ezibonelela ngeempawu ezikhethekileyo zekhonkrithi. Kukho ubukhulu becala i-antifreeze, i-ejenti yokwandisa, i-colorant, i-ejenti yokungenisa umoya kunye ne-ejenti yokumpompa.

ikhonkrithi

2. Ii-superplasticizers ezisetyenziswa ngokuqhelekileyo

I-agent yokunciphisa amanzi ibhekisela kwi-admixture enokunciphisa ukusetyenziswa kwamanzi okuxutywa phantsi kwemeko efanayo ye-concrete slump; okanye inokunyusa i-concrete slump xa i-concrete mix ratio kunye nokusetyenziswa kwamanzi kuhlala kungatshintshi. Ngokobungakanani bezinga lokunciphisa amanzi okanye ukunyuka kwe-slump, ihlulwe ibe ngamacandelo amabini: i-arhente yokunciphisa amanzi aqhelekileyo kunye ne-agent ephezulu yokunciphisa amanzi.

Ukongezelela, kukho ii-agent ezidibeneyo zokunciphisa amanzi, ezifana ne-air-entraining agents zokunciphisa amanzi, ezineempembelelo zokunciphisa amanzi kunye ne-air-entraining; ama-agent okunciphisa amanzi kwangoko aneempembelelo zokunciphisa amanzi kunye nokuphucula amandla okuqala; I-arhente yokunciphisa amanzi, nayo inomsebenzi wokulibazisa ixesha lokumisela kunye nokunye.

Umsebenzi ophambili wesinciphisi samanzi:

a. Ukuphucula ngokuphawulekayo ukumanzi kunye nomlinganiselo womxube ofanayo.

b. Xa idosi ye-fluidity kunye nesamente ingatshintshi, ukunciphisa ukusetyenziswa kwamanzi, ukunciphisa umlinganiselo wamanzi-samente, kunye nokwandisa amandla.

c. Xa i-fluidity kunye namandla ahlala engatshintshi, ukusetyenziswa kwe-samente kugcinwa kwaye iindleko ziyancipha.

d. Ukuphucula ukusebenza kwekhonkrithi

e. Ukuphucula ukuqina kwekhonkrithi

f. Lungiselela ukomelela okuphezulu kunye nokusebenza okuphezulu kwekhonkrithi.

Polysulfonate series: kubandakanywa naphthalene sulfonate formaldehyde condensate (NSF), melamine sulfonate formaldehyde polycondensate (MSF), p-aminobenzene sulfonate formaldehyde polycondensate, modified lignin sulfonate, polystyrene Sulfonates kunye sulfonated sulfonate umzekelo, eqhelekileyo ketonesD esetyenziswa yethu aldeND. naphthalene sulfonate formaldehyde condensate.

Uchungechunge lwePolycarboxylate: lawula ngokufanelekileyo inkqubo yokuqala ye-hydration kunye nokunciphisa ilahleko ye-slump yekhonkrithi.

ikhonkrithi

Umahluko phakathi kwe-arhente yokunciphisa amanzi kunye ne-ejenti eqhelekileyo yokunciphisa amanzi ibonakala ngokukodwa kwi-ejenti yokunciphisa amanzi esebenzayo ngokuqhubekayo inokuqhubeka nokwandisa umbane kuluhlu olukhulu, okanye iyancipha ngokuqhubekayo imfuno yamanzi. Uluhlu olusebenzayo lwabanciphisi bamanzi abaqhelekileyo luncinci.

Umphumo we-superplasticizer kwi-dosage encinci ayinakusetyenziswa njengesiseko sokugweba ukusebenza kwe-superplasticizer. Oku kufuneka kuthathelwe ingqalelo xa ukhetha umnciphisi wamanzi. Elona thamo lifanelekileyo le-superplasticizer kufuneka limiselwe ngokuvavanywa, kwaye akufanele lisetyenziswe kuphela ngokwedosi yomenzi we-superplasticizer.


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  • Ixesha lokuposa: Jun-13-2022