Portable and modular batching and mixing plant for concrete and the like

A portable concrete plant capable of producing up to 240 to 300 cubic yards or more of concrete per hour is disclosed in which two hauling trailers, a mixer trailer and an aggregate trailer, both serve as the transport vehicles and as foundation for the completely erected plant. The aggregate trailer includes three bins used respectively for sand, fine aggregate and course aggregate. Weigh belts convey weighed and humidity measured amounts of sand and aggregate from discrete open top bins to a batch aggregate loading belt for batch loading of a compulsory mixer on the mixer trailer. The side of the aggregate trailer is provided with a bulkhead for an earthen or gravel ramp with large width bins enabling a single loader to supply the high volume of sand and aggregate required. The mixer trailer supports a twin shaft compulsory mixer on a foundation pad which is top loading for concrete constituents and bottom emptying to an elevating and concrete discharge point to awaiting trucks. Pivotally mounted to the mixer trailer from a horizontal transport disposition to a vertically erect operating position are a multi-compartment air loaded, gravity feed cement silo, and weigh hopper for batch weighing of concrete and discharge to the underlying compulsory mixer. Provision is made for the axles located at the rear of the trailer to steer so that precision joining of the plant components can easily occur.