Izinto ezengeza e-konkriti, ezazwalanye ngama-admixture noma izinto ze-pozzolani, yimikhakha yekemikali noma yeminerali ezongeziwe ngqo ekulanyeleni kwekonkriti ukuguqula izakhiwo zayo nokuthulula umsebenzi emizindlakalo ethile. Lemikhakha ifaka izinto ezinciphe amanzi, iziphi zewindi, izinto zokuqalisa, izinto zokukhubazekela, izinto ezilubaya, kanye nozakhi-simento ozusisikhakhi njengeinkungu yesilikha nomlotha-umlilo. Ukwakheka kwayo kuwela kusukela ekumikhakheni ye-polymer engenziwe ngothandeka kuze kufike ezinteletelweni ezenzakalelayo, ngayinye enilungiswe ukubhekana nokuqasa okuthile ekuboneni kwekonkriti, ekuthombeni, nokuqina okude kulindelele endaweni elukhuni ngaphansi komhlaba.
Izinto zokuqalisa nokhubazekelela i-hydration ze-konkriti yimikhakha yekemikali enilungiswe ukuguqula ibango lokukhubeka kwe-Portland cement, ikupela kulawula ngokufinyelele isikhathi sokuxumeka kwekonkriti nokuthuthuka kwamandla asaqala. Izinto zokuqalisa yimikhakha—ngokuphakamiso iqukethe i-calcium chloride, i-sodium nitrate, noma ezikhethile zengakukhlowayidi—eziphangisa i-hydration ye-cement ukunciphisa isikhathi sokuxumeka esiqala nenquma, okuvumela ukuthuthuka kwamandla okushesha. Izinto zokukhubazekela, ezilungiwe kusukela ku-tartaric acid derivatives, lignosulfonates, noma i-hydroxy carboxylic acids, zandisa isikhathi sokusebenza zindluze i-hydration, zigcina i-konkriti ihlanganiseke ngesikhathi sokulula okuthe xolo. Lemikhakha yenguquko yasekelayo kumfundela wokwakhela owobulungiselelo, lapho izimo zomhlaba, izingkubane zokuthomba, nomsebenzi wokwakhela kuvamile ukudinga i-konkriti ekhona noma elibi ngaphandle kwebango elo yokuthomba.
Izinto ezilubaya yimikhakha yekemikali eguqula izakhiwo zereoloji nezomafindo e-konkriti ngokunciphisa i-surface tension yamanzi nokuthinta indlela ye-cement hydration. Emizindlakalo yokwakhela okujulile nomhlaba owusukela, lemikhakha yokukhanya iqukethe i-polycarboxylic ether (PCE) based polymers, sulfonated naphthalene formaldehyde (SNF), noma i-carboxylic acid derivatives ezithulula umsebenzi ngaphandle kokwandisa isibalo samanzi ngo-malo elimililo. Umphumela wokuwelula uvumela omhandisi ukugcina ibango eliphansi lika-water-to-cement ngesikhathi sokufinyelela ngqo i-slump nokuhamba kwekonkriti, okuyisithelo esibalulekile emthakalelo womfundela lapho indlela zakudala zokubeka kwekonkriti zibukhali noma zakungenakwi.
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