i think concrete should start as a liquid and then harden into a strong solid. it would kind of be like the life command in the console except instead of disappearing turning into a solid. you should also be able to make concrete with sand, cement, stone and water. 1 pixel of each = 4 pixels of concrete. it would take about 15 seconds to dry.
ya but this is better also if you are using paste in a building and pressurize it it would shatter glass also it should take a few minutes for the concrete to purify and gain strength. it would also melt at about 3000-4000 degrees celsius. it hardens into stone and glass. also cement would have to be added. cement is a powder that binds
i think concrete should harden into cinderblock. a type of brick thats made of concrete. it would be a lot stronger than brick. it would also be an excuse to turn brick into a different color that would match brick better. I know this will never be implemented, but this is my opinion on concrete.