What factor does NOT affect the desirability of a field batching plant?

The desirability of a field batching plant is influenced by several practical factors that directly affect its operational efficiency and effectiveness. Quality control requirements are crucial because they determine how the concrete will meet project specifications, while the proximity to the job site plays a significant role in the logistical feasibility and cost-effectiveness of delivering materials. Additionally, the type of job being performed can dictate whether a batching plant is necessary or beneficial, depending on the scale and nature of the project.

On the other hand, the color of the concrete mix primarily pertains to aesthetic preferences or specific design requirements but does not inherently influence the operational aspects of the batching plant itself. The mixing process, material handling, and delivery logistics are unaffected by the mix's color. Therefore, while it may be an important consideration for selection and design on a specific project basis, it does not impact the overall desirability of field batching plants in the broader context. This distinction clarifies why the color of the concrete mix is the factor that does not influence the desirability of a field batching plant.