Another suggestion.
Limestone + Kiln (Must be Raging Fire) = Dry Cement (Fact: Cement is made by heating limestone in kilns at 1450 degrees celsius.)
(3) Gravel + (2) Sand + (1) Dry Cement = Dry Concrete Mix
(4) Dry Concrete Mix + (1) Purified Water = Concrete
Logs + Axe = Boards
(4) Boards + Glue = Large Board
(4) Large Board + Conrete = Concrete Wall
(4) Large Board + Concrete + Log = Concrete Channel
Possibilities are Limitless…..