Now that pillars upto ground level are done, plinth beams construction has started. Basically plinth beam connects all pillars and serves as the base for construction of walls. Its important to get the plinth beam alignment and finish perfect. They used metal boards to make sure the finish is good and as per measurements. The plinth being the base can screw up the walls constructions later on. Also, its important to let the plinth beams cure . They have to be strong since all the weight of the house is on plinth beams supported by the pillars. Our contractor used ACC OPC cement. For steel, we went for Indus Strong Steel FE 415. Tata Steel can only be purchased in multiples of 10 tons. My architect said Indus is fine.
Plinth beam -
Another one -