Concrete batching plant equipped with JS horizontal twin shaft mixer, consisting of mixing unit easy and quick to install and of one in-line aggregate storage.
Automation and control
Modern concrete batch plants (both Wet mix and Dry mix) employ computer aided control to assist in fast and accurate measurement of input constituents or ingredients. With concrete performance so dependent on accurate water measurement, systems often use digital scales for cementitious materials and aggregates, and moisture probes to measure aggregate water content as it enters the aggregate batcher to automatically compensate for the mix design water/cement ratio target. Many producers find moisture probes work well only in sand, and with marginal results on larger sized aggregate.
Concrete usage in superstructures like Burj Khalifa in Dubai have tested the limits to which a Control System can manufacture precision concrete. Dosing of Cement, Sand, Crushed Stone, Chemicals and Water in exactly the same proportion as the concrete recipe stipulates is the ultimate test of any control system. It is important that the Control System achieves the closest value to target weight. The fastest controls limit the number of jogs to maximize plant production rates. Variations in materials, weather and humidity, numerous mechanical points, and human input cause even the most accurate automation control to overweigh or underweigh material.
Dust and water pollution
Municipalities, especially in urban or residential areas, have been concerned at the pollution by concrete batching plants. The absence of suitable dust collection and filter systems in cement silos or at the truck loading point is the major source of particulate matter emission in the air. The loading point is a large emission point for dust pollution, so many concrete producers utilize central dust collectors to contain this dust. Notably, many transit mix (dry loading) plants create significantly more dust pollution than central mix plants due to the nature of the batching process. A final source of concern for many municipalities is the presence of extensive water runoff and reuse for water spilled on a producer’s sites.