Idethi Yokuthumela: 27 Jun, 2022
4. Obuyisela emuva
Ama-retarders ahlukaniswe ama-organic retarders kanye ne-inorganic retarders. Iningi lama-organic retarders anomphumela wokunciphisa amanzi, ngakho-ke abizwa nangokuthi ama-retarders kanye nabanciphisi bamanzi. Njengamanje, ngokuvamile sisebenzisa ama-organic retarders. I-Organic retarders ikakhulukazi ibambezela ukugeleza kwe-C3A, futhi ama-lignosulfonate nawo angabambezela ukugeleza kwe-C4AF. Ukwakhiwa okuhlukile kwe-lignosulfonates kungase kubonise izakhiwo ezihlukene futhi ngezinye izikhathi kubangele ukusetha okungamanga kukasimende.
Izinkinga ezilandelayo kufanele zinakwe lapho usebenzisa i-retarder kukhonkolo yezentengiselwano:
A. Naka ukuhambisana nesistimu yezinto zikasimende nezinye izixube zamakhemikhali.
B. Naka izinguquko endaweni yokushisa
C. Naka inqubekelaphambili yokwakhiwa kanye nebanga lokuhamba
D. Naka izidingo zephrojekthi
E. Kufanele kuqashelwe ukuqinisa isondlo lapho
Izinkinga ezilandelayo kufanele zinakwe lapho usebenzisa i-retarder kukhonkolo yezentengiselwano:
A. Naka ukuhambisana nesistimu yezinto zikasimende nezinye izixube zamakhemikhali.
B. Naka izinguquko endaweni yokushisa
C. Naka inqubekelaphambili yokwakhiwa kanye nebanga lokuhamba
D. Naka izidingo zephrojekthi
E. Kufanele kuqashelwe ukuqinisa isondlo lapho
I-sodium sulfate iyimpushana emhlophe, futhi umthamo ofanelekile ngu-0.5% kuya ku-2.0%; umphumela wamandla wangaphambi kwesikhathi awumuhle njengalowo we-CaCl2. Umphumela wokuqala wamandla kakhonkolo we-slag usimende ubaluleke kakhulu, kodwa amandla akamuva ayancipha kancane. Umthamo we-sodium sulfate ejenti yamandla okuqala ezakhiweni zikakhonkolo ezicindezelwe akufanele udlule u-1%; umthamo wezakhiwo zikakhonkolo eziqinisiwe ezindaweni ezinomswakama akufanele udlule u-1.5%; umthamo omkhulu kufanele ulawulwe ngokuqinile.
Ukuwohloka; "iqhwa" endaweni ekhonkolo, ethinta ukubukeka nokuqeda. Ngaphezu kwalokho, i-ejenti yamandla yokuqala ye-sodium sulfate ngeke isetshenziswe kumaphrojekthi alandelayo:
a. Izakhiwo ezixhumene nensimbi engu-galvanized noma i-aluminium iron kanye nezakhiwo ezinezingxenye ezishumekiwe zensimbi ngaphandle kwezinyathelo zokuzivikela.
b. Izakhiwo zikakhonkolo eziqinisiwe zamafektri nezindawo zokuthutha ezifakwe ugesi zisebenzisa amandla e-DC.
c. Izakhiwo zikakhonkolo eziqukethe ama-aggregate asebenzayo.
Isikhathi sokuthumela: Jun-27-2022
