Umhla wokuThunyelwa: 27, Jun, 2022
4. Umnciphisi
Iiretarders zohlulwe zibe zii-organic retarders kunye ne-inorganic retarders. Uninzi lweeretarders eziphilayo zinefuthe lokunciphisa amanzi, ngoko ke zibizwa ngokuba yi-retarders kunye nabanciphisi bamanzi. Okwangoku, sisebenzisa ngokubanzi i-organic retarders. I-Organic retarders ikakhulu icothisa i-hydration ye-C3A, kwaye i-lignosulfonates inokulibazisa ukugalela kwe-C4AF. Ukuqanjwa okuhlukeneyo kwe-lignosulfonates kunokubonisa iipropati ezahlukeneyo kwaye ngamanye amaxesha kubangele ukusekwa kobuxoki kwesamente.
Ezi ngxaki zilandelayo kufuneka ziqwalaselwe xa usebenzisa i-retarder kwikhonkrithi yorhwebo:
A. Nika ingqalelo ukuhambelana nenkqubo yezinto ze-cementitious kunye nezinye izixube zeekhemikhali.
B. Nika ingqalelo utshintsho kwimeko yobushushu
C. Nika ingqalelo kwinkqubela phambili yolwakhiwo kunye nomgama wothutho
D. Nika ingqalelo kwiimfuno zeprojekthi
E. Ingqalelo kufuneka ihlawulwe ekomelezeni isondlo xa
Ezi ngxaki zilandelayo kufuneka ziqwalaselwe xa usebenzisa i-retarder kwikhonkrithi yorhwebo:
A. Nika ingqalelo ukuhambelana nenkqubo yezinto ze-cementitious kunye nezinye izixube zeekhemikhali.
B. Nika ingqalelo utshintsho kwimeko yobushushu
C. Nika ingqalelo kwinkqubela phambili yolwakhiwo kunye nomgama wothutho
D. Nika ingqalelo kwiimfuno zeprojekthi
E. Ingqalelo kufuneka ihlawulwe ekomelezeni isondlo xa
I-sodium sulfate ngumgubo omhlophe, kwaye i-dosage efanelekileyo yi-0.5% ukuya kwi-2.0%; isiphumo sangoko samandla asisihle njengaleyo ye-CaCl2. Impembelelo yokuqala yamandla ekhonkrithi ye-slag ibaluleke kakhulu, kodwa amandla kamva ayancipha kancinci. I-dosage ye-sodium sulfate i-ejenti yokuqala yamandla kwizakhiwo zekhonkrithi ezigxininisiweyo aziyi kudlula i-1%; idosi yezakhiwo zekhonkrithi ezomeleziweyo kwiindawo ezifumileyo aziyi kuba ngaphezu kwe-1.5%; idosi ephezulu iya kulawulwa ngokungqongqo.
Ukuwohloka; "i-hoafrost" kumphezulu wekhonkrithi, echaphazela ukubonakala kunye nokugqiba. Ukongeza, i-agent ye-sodium sulfate yokuqala ayiyi kusetyenziswa kwezi projekthi zilandelayo:
a. Izakhiwo ezidibene nentsimbi ye-galvanized okanye i-aluminium yentsimbi kunye nezakhiwo ezinentsimbi edibeneyo edibeneyo ngaphandle kwamanyathelo okukhusela.
b. Izakhiwo zekhonkrithi ezomeleziweyo zeefektri kunye nezibonelelo zothutho ezifakelwe umbane zisebenzisa amandla eDC.
c. Izakhiwo zekhonkrithi ezinee-aggregates ezisebenzayo.
Ixesha lokuposa: Jun-27-2022
