One of the most important technological properties in the technology of concrete and concrete products is the viability of the concrete mix. This property depends on the setting time of the cement used. Therefore, when you create a new binding, it's necessary, in addition to improving the physical and mechanical properties of the hardened concrete binder and on its basis, to optimize the timing of its setting and hardening. It was established that the composite binder consisting of portland cement and fly ash ground Krasnoyarsk CHP (fly ash content of 40-80%) needs a few minutes to grasp and thicken. The study revealed that the most effective retarder composite binder is gypsum.
Kalashnikov, V. I., Belyakova, E. A., & Moskvin, R. N. (2016). Selecting the Type of the Control Setting Composite Cement-Ash Binder. In Procedia Engineering (Vol. 150, pp. 1631–1635). Elsevier Ltd. https://doi.org/10.1016/j.proeng.2016.07.143