This building (21x21) comes in three varieties, fueled by Petroleum, charcoal, or coal. It is used to make Cement and Concrete.
All three varieties are built in a compound and cost:
Making a batch of 250 Concrete costs:
NOTE: This does not require any stirring -- just mix the ingredients and take it. All water in vat will be used, so if you put more than 100 water, it will all be used.
Making a batch of 100 Cement costs:
NOTE: Even though you are required to put in 500 Water in Jugs it will only use the water, not the jugs.
You can run as many cement batches off this 500 water as you like; it will not be used provided that you do not mix concrete. --Sedelyan
Once started, the cement must be stirred continuously by a team of people (strength and endurance timer of 45 seconds with 0 STR AND 0 END) or it will solidify and all ingredients wasted. The stir timer without food is 45 secs. Stirring starts out easy, but the stirs have to come closer and closer together as it gets closer to completion (about 10 second timeframe at end). Progress is made with each stir so you will want to get good food and stir as often as possible. Towards the end (depending on the food) people may need to let the timer tick down the appropriate amount before stirring so a round is not over before the first person can stir again).
At the end of a stir, the timer is precisely 12 seconds. This means that with food of at least 21 strength and endurance, you can produce Cement by yourself...but with absolutely no window whatsoever. You have to be good, and you have to be fast, and you have to be *constantly* checking...especially if there's a serverside lag spike. --Sedelyan
See Also: Stirring Food, Gaining Bauxite and Gypsum, Attributes