Građevinar, Vol. 76 No. 08., 2024.
Prethodno priopćenje
https://doi.org/10.14256/JCE.3543.2022
Some aspects of the suitability of three-stage mixing for ready-mixed concrete
Alena Sičáková
Jeonghyun Kim
Sažetak
Several studies have indicated that three-stage mixing (TM) methods improve the mechanical strength and slump of concrete compared to those of normal mixing methods, particularly when a recycled concrete aggregate is used. However, most studies did not address the technological aspects of ready-mixed concrete, including continuous mixing during site delivery. In this study, the properties of concrete (slump and compressive strength) based on the time lapse after mixing via the TM method (i.e. immediately, 45 min, and 90 min after mixing) were investigated, and the samples were tested after three years of curing. The results indicate some positive effects of TM on ready-mixed concrete and its characteristics on a delivery to the construction site, particularly a less severe loss of consistency compared to that of conventional mixing, as well as a positive effect on the compressive strength when fly ash is used as an aggregate coating additive in the first stage of concrete mixing.
Ključne riječi
concrete; recycled concrete aggregate; three-stage mixing; mixing time; consistency; compressive strength
Hrčak ID:
321019
URI
Datum izdavanja:
30.9.2024.
Posjeta: 149 *