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 okuqala, njl.
c. I-Admixtures yokulungelelanisa umxholo womoya wekhonkrithi. Kukho i-air-entraining agents ikakhulu, ii-air-entraining agents, i-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.
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 njalo njalo.
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.
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.
Ixesha lokuposa: Jun-13-2022
