Pregled bibliografske jedinice broj: 591492
Kinetics of cement hydration with replacement addition of fly ash into aqueous suspension systems
Kinetics of cement hydration with replacement addition of fly ash into aqueous suspension systems // Proceedings Matrib 2011, International Conference on Materials, Tribology and Recycling / Schauperl, Zdravko ; Šolić, Sanja (ur.).
Zagreb: Hrvatsko društvo za materijale i tribologiju (HDMT), 2011. str. 159-167 (ostalo, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
CROSBI ID: 591492 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Kinetics of cement hydration with replacement addition of fly ash into aqueous suspension systems
Autori
Jozić, Dražan ; Knezović, Ivana ; Bernstorff, Sigrid
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Izvornik
Proceedings Matrib 2011, International Conference on Materials, Tribology and Recycling
/ Schauperl, Zdravko ; Šolić, Sanja - Zagreb : Hrvatsko društvo za materijale i tribologiju (HDMT), 2011, 159-167
ISBN
978-953-7040-19-2
Skup
13rd International Conference on Materials, Tribology, Recycling, MATRIB 2011
Mjesto i datum
Vela Luka, Hrvatska, 29.06.2011. - 01.07.2011
Vrsta sudjelovanja
Ostalo
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
fly ash; cement; portlandite; hydration; kinetics; TG/DTG
Sažetak
Fly ash is a waste material formed by combustion in coal fired thermal power plants. It is usually used as a replacement material for cement in the cement industry, in this way is solved the environmental problem of waste disposal, are reduced CO2 emissions from cement production, protected natural resources and reduced the production cost of cement. In this paper is presented the influence of the addition of fly ash (from the Thermal power plant Plomin2, HEP) as replacement material on the kinetics in the early phase of cement hydration (type CEM IIA-S 42.5 N). Hydration was carried out in isothermal conditions (20 ± 1 ° C) and till 72 hours of hydration in aqueous suspensions with and without the addition of fly ash in the amount of 5 and 10 wt.%. Aqueous suspensions were prepared with weight ratio of w/s=4 (water/solid (solid = cement + fly ash)). Hydration in aqueous suspensions was stopped in specific times after 30 min., 1, 3, 5, 7, 9, 11, 15, 17, 20, 24, 48 and 72 hours. The content of hydration produced portlandite (Ca(OH)2) was determined by using thermal methods (TG / DTG-DTA). The results of mathematical modelling of hydration indicate that an increasing replacement addition of fly ash increases the hydration degree of cement. The observed change is a direct consequence of extending the duration of hydration in which the slowest processes that determine the speed of the reactions are the processes of nucleation and growth and interaction at boundary interfaces.
Izvorni jezik
Engleski
