Community service for casting village roads 

Still in the edition of the voluntary work of casting village roads, boss.. even though the quality of the cast village roads is probably equivalent to K 250 in my opinion.
For k 250 concrete, what is the ratio of sand, coral and cement?
thankfully given a table of the quality of cast concrete starting at 100 and so on.
Thank You
Enjoy watching.
#Diggingthevillageroad #concreteroad