Idethi yokuthunyelwe:27,Nov,2023

I-Retarder iyinhlanganisela evame ukusetshenziswa ekwakhiweni kobunjiniyela. Umsebenzi wayo oyinhloko ukulibazisa ngokuphumelelayo ukuvela kwesiqongo sokushisa kwe-cement hydration, okuzuzisa ibanga elide lokuhamba, izinga lokushisa eliphakeme elizungezile nezinye izimo zikakhonkolo, udaka lukasimende nezinye izinto zokwakha. Gcina i-plasticity ngaphansi kwezimo, ngaleyo ndlela uthuthukise izinga lokuthulula ukhonkolo; lapho kuthinteka ezinye izimo ezikhethekile ezifana nesimo sezulu noma izidingo zesimiso sokwakha, i-retarder nayo idinga ukungezwa, engathuthukisa ukusebenza kokhonkolo, yandise isikhathi sokumisa usimende, futhi iphinde inciphise imifantu yokwakha. Indlela yokukhetha uhlobo olufanele kanye nomthamo we-retarder ukuze kuthinte ukusebenza kukasimende ukhonkolo kuwumbuzo okufanele ufundwe.

1.Umthelela ngesikhathi sokuvala

Ngemva kokwengeza i-retarder, isikhathi sokuqala nesokugcina sokusetha sikakhonkolo sinwetshwa kakhulu. I-retarders ehlukene inemiphumela ehlukene ngesikhathi sokusetha ukhonkolo ngethamo elifanayo, futhi ama-retarders ahlukene anemiphumela ehlukile yokubuyisela emuva kukhonkolo. I-retarder enhle kufanele ibe nomphumela omuhle wokuhlehlisa lapho umthamo wayo umncane. I-retarder efanelekile kufanele ikhulise isikhathi sokuqala sokubeka ukhonkolo futhi inciphise isikhathi sokugcina sokusetha. Okusho ukuthi, isikhawu sokuqala nesokugcina sokubeka ukhonkolo kufanele sifinyezwe ngangokunokwenzeka.

 2.Umthelela ekusebenzeni kwengxube

Emsebenzini wobunjiniyela, ukuze uvumelane nezinto zokuhamba futhi uhlangabezane nezidingo zokwakha, i-retarder ivame ukungezwa kukhonkolo ukuze kuthuthukiswe ukusebenza kwengxube kakhonkolo nokunciphisa ukulahleka kokuwohloka ngokuhamba kwesikhathi. Ukwengezwa kwe-retarder kuthuthukisa kakhulu ukufana nokuzinza kwengxube, kugcina ipulasitiki isikhathi eside, kuthuthukisa izinga lokwakhiwa kwekhonkrithi, futhi kuvimbela ngokuphumelelayo imifantu ebangelwa ukuncipha kokuqala kokhonkolo.

3.Umthelela emandleni okhonkolo

Ukwengezwa kwe-retarder kungakwazi ukugcwalisa ngokugcwele izinhlayiya zikasimende, okuzuzisa ukwandisa amandla kakhonkolo phakathi nezigaba ezimaphakathi nezakamuva. Njengoba amanye ama-retarders nawo anomsebenzi othile wokunciphisa amanzi, ngaphakathi kwebanga elifanele lesilinganiso, uma umthamo ukhudlwana, isilinganiso samanzi-samente wengxube kakhonkolo sizoba sincane, okuzosiza ukuthuthukiswa kwamandla kakhonkolo. Kumaphrojekthi wangempela, ngenxa yomthamo oweqile we-retarder, ukhonkolo angeke ubekwe isikhathi eside, futhi amandla okhonkolo angeke ahlangabezane nezidingo zokuklama ngesikhathi sokwamukelwa kwephrojekthi. Ngakho-ke, kufanele sinake ukukhethwa kwezinhlobonhlobo ze-retarder futhi silawule ngokuqinile umthamo we-retarder. Ngesikhathi esifanayo, kufanele futhi sicabange ngokugcwele ukuhambisana nokuzivumelanisa nezimo phakathi kwe-retarder nezinto zokusetshenziswa zikakhonkolo.