It is enough to add retarder admixture directly to concrete. Do you have any ideas?

(1) Pay attention to the mutual adaptation with the cementitious material system. For different cementitious material systems, they can show different condensation and hardening properties, and they also have different requirements for the role of retarder. For example, for cementitious material systems without mineral admixtures, concrete sets and hardens quickly, and a retarder is needed…