Actually a dry mix batch plant is little more than silos or storage units to hold the Portland cement and other chemicals added to a mix which determines the plasticity of the pour the amount of time a mix can remain in the mixer drum accelerants for faster cure rates and a host of other things added in very small quantities, plus a pair of conveyors to haul sand and aggerate up for pouring back down into a mixer truck where water is then added to the mix. The heart of an operation such as a wet plant is a mixer drum often very large ones at that but most of the wet plants or portable batch plants that I have seen use a drum or an old mixer truck which is no longer suitable for highway use. Those will just sit there and turn mixing the concrete the pouring into tippers or loaders or even powered wheel barrows which transport short distances usually staying on the same property to the pour of the day.
In many countries where it can be very hot or there are long distances to be traveled or long travel times due to road and traffic conditions the mixer trucks will have a 3 to 500 gallon water tank mounted on them in addition to their drum these will leave the dry batch plant then start to mix near or at their destination or wait in line turning the dry contents until it is time for them to wet up . A project I was involved with in Oman had not only a huge dry batch plant but over 100 mixer trucks on site and 5 pumper rigs. the mixer trucks would start loading for the next days pour at their companies batch plants sometime in the night the days pour started at around 4 AM and by days end nearly all trucks would have visited the on site batch plant at least twice Huge screeds would spread the pumped concrete dozens of ride on power trowels worked feverously throughout the day. 100s of whip vibrators would be pushed up and down the footing and wall forms. Miles upon miles of plastic sheeting would be stretched over the slabs and 1000s of workers were so tired you would wonder if they would show up the next day. many wouldn't

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