a. When the site needs a large amount of disposable cast (optional mixing by agitation for 12 hours or more), enough pieces of higher quality requirements, and no reinforcements near Concrete mixing plants, the best choice of two specifications of smaller mixing station, or choose a main one of the two aircraft preparation.
b. When the site inaccessible, maintenance personnel need to spend a lot of time and out of the site, the best choice with the same smaller size of the two aircraft stations, or prepare enough spare parts to ensure the smooth construction progress.
c. When the construction to a precast concrete plant, but not too far distance between sites, the radius of concrete delivery vehicles transporting no more than half an hour, dump trucks transporting no more than 10 minutes. Best use of multi No. concentrated agitation to improve the utilization of mixing station and construction cost.
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