Couple of bags (>= 2kg) or 2 liters of cola (200 g) to a truck load? Not only is there a magnitude difference, I also doubt that 2 kg will do that. Normal amounts are up to 0.1 %, say you need 0.5 % to make it significantly weaker. 10 cubic yards, 7.5 m³ of concrete, are about 18’000 kg. 0.5 % of that are 90 kg.
Couple of bags (>= 2kg) or 2 liters of cola (200 g) to a truck load? Not only is there a magnitude difference, I also doubt that 2 kg will do that. Normal amounts are up to 0.1 %, say you need 0.5 % to make it significantly weaker. 10 cubic yards, 7.5 m³ of concrete, are about 18’000 kg. 0.5 % of that are 90 kg.
So it will even set faster and really take at least 0.5 % to reduce the strength in any significant way.
Perhaps not only 2 bags, but it doesn’t take much, and is very doable by motivated single individuals.
Dumping halve a ton of sugar in a truck is technically doable, but a bit harder than a bottle of cola.