Rapid International Ltd recently commissioned a new Rapidmix 400CW, fully weighed, mobile continuous mixing plant (pugmill) for Pavement Recycling Systems.
The new Rapidmix is being utilised initially for the production of RCC (roller compacted concrete) for the Port of Long Beach Middle Harbour Redevelopment Project. The Rapidmix will also be involved in the production of RCC and various other materials for future projects across California and other Western US States.
Established in 1989, California-based Pavement Recycling Systems, is a 100% employee owned company specialising in state-of-the art recycling solutions to reclaim, preserve and rehabilitate pavement at any stage. Pavement Recycling System’s goal is to reduce the environmental impact of paving, while simultaneously improving quality and reducing costs.
After securing its first RCC project, Pavement Recycling Systems identified a requirement for a mobile continuous mixing plant solution. After learning of a global building materials group’s experience in similar projects with the volumetric version of the Rapidmix 400 mobile continuous mixing plant, Pavement Recycling Systems made the decision to initially rent their plant on trial basis.
Having learned the capabilities of the Rapidmix plant during the rental period, and wanting to take full advantage of the weighing technology of newer Rapidmix plants, Pavement Recycling Systems subsequently made the decision to purchase a new Rapidmix 400CW fully weighed, mobile continuous mixing plant for their ‘Renew” division. The company’s intention was to use it initially for the Port of Long Beach Middle Harbor Redevelopment Project and also for future planned RCC and other mixing projects throughout their area of operation.
The Port of Long Beach Middle Harbor Redevelopment Project is an ongoing $1.2bn project to upgrade two old container terminals at the port and conjoin them into one advanced and green terminal. The upgrading works will be carried out on piers E, D and F.
The project will also double the container handling capacity of the two terminals from its current 1.3 million TEUs per year and cut down air pollution by 50%.
Construction work commenced in May 2011 and is expected to take nine years to complete.
The production process for RCC involves the Rapidmix receiving aggregates from the plant’s aggregate hopper via the weighed conveyor belt, along with a specified weighed amount of cement from the onboard silo. This is subsequently mixed in the onboard pugmill and loaded into trucks via the machine’s outloading conveyor. The cement treated aggregates are finally loaded into compaction pavers and laid at 94% compaction. Compacting rollers are finally used to further compact the material to 98%.
Shortly after it is laid, the RCC is sufficiently strong enough to support traffic and further operations all the way to the edge of the step.