Returned concrete is a reality and a liability in the readymix concrete industry! It is estimated that the returned concrete from the sites vary from 1 to 3 percent of the volume manufactured at the plant. On the other hand managing the fresh concrete leftovers in the truck mixers and concrete pumps is a daily problem that readymix concrete industries have to cope with.
Beyond the environmental aspect and the obligations arising from legislation, the more important issue is the economy. Typical traditional practices such as disposal of the residual concrete on the ground or in tanks and their management at a later time as dried concrete, among other negatives, are no longer economically unprofitable.
New technologies offer a complete and profitable solutions to this problem and with absolute certainty that the cost of investment will sooner or later be amortized by the benefits of the solution. One of modern solutions for returned concrete is the recycling plant. However, recycling systems are not widespread enough in medium-sized readymix concrete facilities due to the operating cost rather than the investment cost.
The employment of unproductive personnel increases the cost of per m3 of concrete! Who will run the recycling facility and who should be responsible from the system? Should we ask the batchplant operator to do this job? The main question is, whether the success in recycling plants really depends on one responsible person or should we train all mixer drivers returning from the sites or what?
The aim of this eBook is to look at the issue from a different perspective. The study consists of following sections; returned concrete, returned concrete management, rinsing mixer drum, why recycling, mechanical recovery, fresh concrete recycling, filter press, tips for the operators and recycle aggregates in new concrete.
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