Usuku lwePost: 1, APR, 2024
Ngokuvamile kuzwakala ukuthi ukukhuphuka kwezinga lokushisa, lapho izinhlayiya zensimbi zizokwenza i-adderb i-adpeckboxylate agent enyuselwa amanzi. Ngasikhathi sinye, okuphezulu kakhulu kwamazinga okushisa, imikhiqizo ecace kakhudlwana i-Cement Hydration izodla i-ejenti yokunciphisa amanzi e-polycarboxylate. Ngaphansi kwethonya elihlanganisiwe lemiphumela emibili, njengoba izinga lokushisa liyanda, uketshezi lukakhonkolo luba lubi kakhulu. Lesi siphetho singachaza kahle into ekhuphuka ngokhonkolo lapho amazinga okushisa awela khona, futhi ukulahleka kokhonkolo kuyanda lapho izinga lokushisa likhuphuka lapho izinga lokushisa likhuphuka lapho izinga lokushisa likhuphuka lapho izinga lokushisa likhuphuka lapho izinga lokushisa likhuphuka lapho izinga lokushisa likhuphuka lapho kuvuka izinga lokushisa. Kodwa-ke, ngesikhathi sokwakha, kwatholakala ukuthi uketshezi lukakhonkolo lumpofu emazingeni okushisa aphansi, kwathi lapho izinga lokushisa lamanzi lokuxuba likhuphuka, uketshezi lukakhonkolo ngemuva kokukhuphuka komshini. Lokhu akunakuchazwa yisiphetho esingenhla. Kuze kube manje, izivivinyo zenziwa ukuze zihlaziye, thola izizathu zokuphikisana, futhi zinikeze uhla lokushisa olufanele lukakhonkolo.
Ukuze ufunde umphumela wokuxuba lokushisa kwamanzi emphumeleni wokuhlakazwa kwe-ejenti yokunciphisa amanzi e-polycarboxylate. Amanzi ku-0 ° C, 10 ° C, 20 ° C, 30 ° C, no-40 ° C.
Ukuhlaziywa kukhombisa ukuthi lapho isikhathi sokuphuma komshini sifushane, ukwanda kukasimende slurry kuqala kukhuphuka bese kuncipha njengoba izinga lokushisa likhuphuka. Isizathu salesi simo ukuthi izinga lokushisa lithinta womabili amazinga okuhlaselwa kosimende kanye nezinga le-adsorption le-superplastizer. Lapho izinga lokushisa likhuphuka, ngokushesha inani le-adsorption lama-molecule we-superplastimizer, okungcono umphumela wokuhlakazeka kwangaphambili. Ngasikhathi sinye, izinga le-hydrate lika usimende liyashesha, kanye nokusetshenziswa kwe-ejenti enciphisa amanzi ngemikhiqizo ye-hydration kukhuphuka, okunciphisa uketshezi. Ukunwetshwa kokuqala kokunamathisela kosimende kuthintwa yimiphumela ehlanganisiwe yalezi zinto ezimbili.
Lapho ukuxubana kwamanzi okushisa kungu-≤10 ° C, izinga le-adsorption le-superplastimizer kanye nezinga le-hydration lincane. Phakathi kwazo, ama-adsorption we-ejenti enciphisa amanzi kwizinhlayiya zokwenza usimende yinto elawulwayo. Njengoba i-adsorption ye-ejenti encishisiwe yamanzi ezinhlathini zika-CEMEMS ihamba kancane lapho amazinga okushisa ephansi, izinga lokuqala lokunciphisa amanzi liphansi, elibonakaliswa ku-fluodity okuphansi kakhulu kasimende slurry.
Lapho amazinga okushisa kwamanzi okuxubana aphakathi kuka-20 no-30 ° C, izinga le-adsorption le-ejenti ekhulisa amanzi kanye nezinga le-hydrate lokunyuka kosesimende ngasikhathi sinye, kanye nesilinganiso se-advelption se-agent-ejenti ye-ejenti inyuka ngaphezulu Ngokusobala, okuboniswa ekwandeni kokwanda kokuqala kwe-slurry kasimende. Lapho ukuxubana kwamanzi okushisa kungu-≥40 ° C, izinga lesikhumba se-hydration likhuphuka kakhulu futhi kancane kancane liba yinto elawulwayo. Ngenxa yalokhu, izinga le-adsorption linciphisa ama-agent ama-acent ama-molekyuli (isilinganiso se-adsorption rate monus ukusetshenziswa kwesilinganiso) siyancipha, futhi i-slurry yesimende ibuye ikhombise ukuncishiswa kwamanzi. Ngakho-ke, kukholelwa ukuthi umphumela wokuqala wokuhlakazwa kwamanzi anciphisa amanzi ungcono kakhulu lapho amanzi okuxuba aphakathi kuka-20 no-30 ° C kanye namazinga okushisa okushisa usimende aphakathi kuka-18 no-22 ° C.
Lapho isikhathi esiphuma ngomshini side, ukwanda okumnandi kosimende kuyahambisana nesiphetho esamukelwa ngokuvamile. Lapho isikhathi sanele, i-ejenti yokunciphisa amanzi e-polycarboxdate ingahle i-adderbed kwizinhlanzi zokonga ekushiseni ngakunye kuze kube yilapho igcwele. Kodwa-ke, emazingeni okushisa aphansi, i-ejenti encane yokunciphisa amanzi idliwa nge-hydration yesimende. Ngakho-ke, njengoba isikhathi sihamba, ukwanda kwesikhumba sikasimende kuzokwanda ngamazinga okushisa. Ukukhuphuka nokuncipha.
Lokhu kuhlola akugcini nje ngokubheka umphumela wokushisa, kepha futhi kubhekisisa umphumela wesikhathi emphumeleni wokusakazeka we-ejenti we-polycarboxylate agent, okwenza isiphetho esithile futhi sisondele kakhulu engokoqobo. Iziphetho ezidwetshiwe zimi ngokulandelayo:
(1) emazingeni okushisa aphansi, umphumela wokuhlakazeka we-polycarboxylate ejenti yokunciphisa amanzi anciphisa isikhathi esisobala. Njengoba isikhathi sokuxuba sikhuphuka, uketshezi lwe-slurry kasimende luyanda. Njengoba amazinga okushisa okuxuba kwamanzi akhuphuka, ukwanda kwesikhumba se-slurry yokuqala kwanda bese kuncipha. Kungaba nokwehluka okukhulu phakathi kwesimo sikakhonkolo njengoba kuphuma emshinini kanye nesimo sokhonkolo njengoba kuthululelwa esizeni.
(2) Ngesikhathi sokwakhiwa kwamazinga okushisa aphansi, ukufudumeza amanzi okuxubha kungasiza ukuthuthukisa i-fluodity lag ngokhonkolo. Ngesikhathi sokwakha, kufanele kubhekwe ekuphathweni kokushisa kwamanzi. Izinga lokushisa le-slurry kasimende liphakathi kuka-18 no-22 ° C, futhi uketshezi luhamba phambili lapho kuphuma emshinini. Vikela into yohlobo lokunciphisa ubisi lukakhonkolo olubangelwa ukushisa kwamanzi ngokweqile.
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Isikhathi Sokuthumela: APR-01-2024
