The concrete mixtures were prepared using a double horizontal shaft laboratory mixer. Once mixed, the specimens were compacted into molds and left to demold for 1 d at a 20 ± 5 °C and relative humidity of more than 50%. Following the demolding stage, the specimens were subjected to standa...
(5) The forced mixer is used for mixing the mixture; the mixing time is not less than 2 min. The weighing error of the raw materials is cement and accelerator ±1%, sand ±3%. The transportation time of the mixture shall not exceed 2 h. ...