Letsatsi la poso: 27 Phup,2022
4. Motho ea liehang
Li-retarders li arotsoe ka li-organic retarders le inorganic retarders. Boholo ba li-retarders tsa manyolo li na le phello e fokotsang metsi, kahoo li boetse li bitsoa li-retarders le li-water reducers. Hajoale, hangata re sebelisa li-organic retarders. Li-organic retarders haholo-holo li liehisa hydration ea C3A, 'me lignosulfonates le tsona li ka liehisa hydration ea C4AF. Mefuta e fapaneng ea lignosulfonates e ka bonts'a thepa e fapaneng mme ka linako tse ling e baka ho beha samente ea bohata.
Mathata a latelang a lokela ho eloa hloko ha o sebelisa retarder ka konkreite ea khoebo:
K. Ela hloko ho tsamaellana le sistimi ea thepa ea cementitious le metsoako e meng ea lik'hemik'hale.
B. Ela hloko liphetoho tsa tikoloho ea mocheso
C. Ela hloko tsoelo-pele ea kaho le sebaka sa lipalangoang
D. Ela hloko litlhoko tsa morero
E. Tlhokomelo e lokela ho lefshoa ho matlafatsa tlhokomelo ha
Mathata a latelang a lokela ho eloa hloko ha o sebelisa retarder ka konkreite ea khoebo:
K. Ela hloko ho tsamaellana le sistimi ea thepa ea cementitious le metsoako e meng ea lik'hemik'hale.
B. Ela hloko liphetoho tsa tikoloho ea mocheso
C. Ela hloko tsoelo-pele ea kaho le sebaka sa lipalangoang
D. Ela hloko litlhoko tsa morero
E. Tlhokomelo e lokela ho lefshoa ho matlafatsa tlhokomelo ha
Sodium sulfate ke phofo e tšoeu, 'me tekanyo e loketseng ke 0.5% ho 2.0%; phello ea matla ea pele ha e ntle joaloka ea CaCl2. Matla a pele a matla a konkreite ea samente ea slag a bohlokoa haholo, empa matla a morao a fokotseha hanyenyane. Tekanyo ea sodium sulfate ea matla a pele ho meaho ea konkreite e kentsoeng pele e ke ke ea feta 1%; tekanyo ea meaho ea konkreite e matlafalitsoeng libakeng tse mongobo ha ea lokela ho feta 1.5%; tekanyo e phahameng ka ho fetisisa e tla laoloa ka thata.
Ho senyeha; "hoarfrost" holim'a konkreite, e amang ponahalo le qetello. Ntle le moo, sodium sulfate ea pele ea matla e ke ke ea sebelisoa mererong e latelang:
a. Mehaho e amanang le tšepe ea galvanized kapa tšepe ea aluminium le meaho e nang le likarolo tse kentsoeng tsa tšepe ntle le mehato ea ts'ireletso.
b. Mehaho ea konkreite e matlafalitsoeng ea lifeme le lipalangoang tse nang le motlakase tse sebelisang matla a DC.
c. Mehaho ea konkreite e nang le li-aggregate tse sebetsang.
Nako ea poso: Jun-27-2022
