Pumps high-flow concrete into mattress

A flexible concrete mattress is a fabric form that is laid out on a slope, channel or embankment and then filled with highly flowable concrete or grout until it hardens into a protective lining. Suppliers describe the system as two high-strength fabric layers stitched or connected to control thickness and shape during filling. Once pumped full, the mattress becomes a continuous revetment used to resist erosion, scour and surface damage. ### What is actually being pumped into the “mattress”? The material being pumped is not ordinary coarse concrete from a standard slab pour. Synthetex’s installation guide says fabric forms are typically filled with high-strength, fine-aggregate concrete because it is pumpable and suited to the confined fabric cavity. ACE Geosynthetics similarly describes filling the system with high-strength grout or mortar to form a stable protective layer. (geoquest-group.ca) The “mattress” is the fabric shell itself. HUESKER says its Incomat system uses two high-strength fabric layers filled on site with fluid concrete, while Synthetex says self-sealing fill valves are placed at set locations so an injection pipe at the end of a pump hose can charge the form in sequence. ### Why use fabric forms instead of cast-in-place concrete? Manufacturers pitch the method as a way to avoid some of the labor and access demands of conventional concrete lining. (skaps.com) Fabriform says its revetment systems eliminate time-consuming wooden forms, while Ferguson Waterworks says fabric-formed concrete is used where professionals need durable hard armor for scour protection and uneven subgrades. The geometry is part of the selling point. Terrafix says a fabric-formed concrete mattress can follow the profile of a ditch base and side slopes, helping the lining conform to irregular ground rather than forcing a rigid slab onto a variable surface. (huesker.co.uk) HUESKER says the finished layer adapts to complex terrain both above and below water. ### Where is this used in practice? Product literature places these systems in hydraulic and erosion-control work rather than building construction. (fabriform1.com) Synthetex says fabric-formed concrete is used for erosion and scour protection and can be installed underwater. Geoquest’s TechRevetment literature lists riverbanks, canals, reservoirs, bridge abutments and other hydraulic structures among its applications. (terrafixgeo.com) Terrafix and HUESKER describe similar use cases. Terrafix markets the mattresses for shoreline, channel and slope stabilization, and HUESKER lists embankments, riverbeds, canals, coastal areas and berth protection. Those examples line up with the social-media description of canal lining, embankment stabilization and rapid protective works in constrained sites. ### What makes the method “flexible”? (geoquest-group.ca) The flexibility comes first from installation and then from service behavior. Before filling, the fabric can be placed over uneven or steep ground more easily than rigid formwork. After curing, some systems are designed as articulated or sectioned mattresses that better accommodate local settlement than a monolithic slab, according to supplier literature. That does not mean the system is forgiving of poor installation. (terrafixgeo.com) Synthetex’s guide says fabric forms can be placed dry or underwater, but filling depends on pumpable fine-aggregate concrete, controlled valve locations and proper sequencing. In practice, that means subgrade preparation, anchorage, panel alignment and mix consistency matter before the first hose is connected. ### What are the main constraints engineers watch? (concretemattress.com) The key constraint is mix control. A mix that is too stiff may not fill the fabric evenly, while a mix that is too fluid can complicate thickness control or placement, according to the way manufacturers describe pumpability and valve filling. Because the form defines the final geometry, misplacement of the fabric or poor anchoring can also lock defects into the finished lining. (skaps.com) The other constraint is that this is a system, not just a material. Supplier guidance points to a sequence of design checks: prepare the subgrade, lay and anchor the fabric, plan the fill pattern, use the specified fine-aggregate concrete or grout, and verify the mattress type for the expected shear stress and hydraulic conditions. (geoquest-group.ca) (skaps.com)