GFRC Concrete


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Frequently Asked Questions

Q: How is the RimCraft GFRC Spray Equipment Designed, Engineered, and Constructed for Concrete processing?

A: The Concrete slurries are abrasive and corrosive materials that require compatible fluid passages made from Stainless Steel and certain plastics, FRP does not use Home Depot plumbing fittings that are made of steel.


Q: Why use a peristaltic hose pump instead of a piston, diaphragm or rotor/stator pump?

A: FRP uses a our own designed peristaltic hose pump for it's ability to pump abrasive and corrosive materials. The slurry passages are engineered in such a way as to provide total residual-free cleanouts.  Piston or diaphragm pumps leave material in the corners that cannot be cleaned out. Rotor/Stator pumps can create too much friction for heavily aggregated slurries causing undue wear. This excessive friction can also cause premature curing of the slurry in the spray hose that can get expensive. The RimSpray pump is easy to disassemble to replace a hardened hose by dropping down the lower housing and the rotor while leaving the entire drivetrain intact. RimSpray GFRC Spray System peristaltic pumps are:

Seal-less -  Dry-Running -  Self-Priming to 27'
Abrasion Resistant - Reversible Rotation
Metering Accuracy to ±1%  
Integral Conventional Gear Drives

Q: How does a peristaltic hose pump work?

A: Peristaltic pumps work using the process of peristalsis to pump products through a hose the same way that blood and oxygen are pumped around the body. The hose sits around a rotor which, when turning, compresses a segment of the hose almost flat. 
This compression is released as the rotor moves around the hose with the hose reinforcements causing it to spring back to its round shape, thus creating a partial vacuum refilling the hose. This compression creates a seal and, as the rotor turns, any product on the discharge side of the rotor is propelled forward and displaced from the pump. Combining this suction and discharge action results in a self-priming positive displacement pump.

Q: How is the RimCraft GFRC Spray System different from other marketed GFRC equipment?

A: Most of the other equipment on the market that is being presented as cement processing equipment is lacking in technology. They typically work for the first few batches, then it becomes a high maintenance and troublesome piece of equipment. FRP researched the environments that the GFRC Spray Systems had to operate in when we started to design our system. The system would be in water prone areas at all times, must require little to no maintenance and  flush quickly and easily with no disassembly of components. All components must be laid out for easy inspection and access. The system must be USER FRIENDLY! With all of this in mind, FRP set out to engineer a TRUE GFRC PROCESSING SYSTEM! FRP tested several pumps before settling on the current design RimSpray 1 1/4" peristaltic hose pump. The entire system can be flushed with less than 5 gallons of water and in less than 10 minutes. The RimCraft GFRC Spray Gun is modular in design. The spray nozzle is CNC Machined from Stainless Steel to provide long life. Competitor's are typically machined from a soft aluminum material. The pneumatic components are protected from the elements by a fiberglass control box enclosure. All fittings, clamps, fluid passageways are engineered and manufactured from Stainless Steel and certain plastics for corrosion resistance. The system can be plugged into any standard 15 AMP 120 Volt AC wall outlet. For worker safety, RimCraft Gypsum Systems are equipped with a Ground Fault Circuit Interrupter (GFCI) Plug.

FRP uses Direct Drive Gear Boxes and Motors to power the peristaltic pump. Others use a chain drive to power their pumps. The chain is prone to rust and slurry build-up, causing it to pop off. The chain is usually located in a position that makes it almost impossible to lubricate and is a maintenance nightmare when the chain pops off. All electrical components on the RimCraft GFRC Spray System are sealed from water and can be washed down. All fasteners (including the nuts and bolts) are Stainless Steel to resist corrosion.

Q: Can the RimCraft GFRC Spray System spray Concrete slurries that have aggregate mixed in them, such as sand?

A: Yes, all of RimCraft GFRC Spray Systems can spray Concrete slurries with sand. However the RimSpray GFRC Spray System is better suited for this application, due to the stronger pump hose and larger pump size. It is recommended to use a polymer modifier, such as the VF-774 sold by Smooth-On. The polymer helps keep the sand in suspension. Consult your cement sales representative or Smooth-On for more information.

Q: Does FRP offer training and setup?

A: YES! When a customer purchases a RimCraft GFRC Spray System we want them to get a fast return on their investment. FRP will come to your facility to setup the new system and train the operator for 2 days free of charge.  This offer is only good in the 48 US States. FRP will travel internationally but the customer must pay the airfare.

Q: Does FRP provide demos of the GFRC Spray Equipment?

A: Yes, when a system is here at the FRP Manufacturing facility. We try our best to keep a system here at all times but they are usually purchased after a demo. We only provide demos here at the FRP Manufacturing Facility. Please Call to schedule a demo. We encourage you to ship a mold to us for your demo.

Q: Does FRP build custom Cement Processing Systems?

A: Yes.FRP  has produced GFRC Systems that were completely PLC controlled and built in mixer. Various chassis configurations and boom lengths. Please see our Custom Equipment Page to view pictures of these system. We will build to suit YOUR NEEDS!