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Month: <span>March 2019</span>

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16

Mar

Basalt reinforcement for concrete

Reinforcing concrete structures with Basalt rebars

Traditional reinforced concrete  structures often encounter durability problems due to cracks caused by corrosion expansion of steel bar. With respect to steel bar, Basalt Fibre Reinforced Polymer (BFRP) bars present superior corrosion resistance as a kind of novel nonmetallic reinforced bars with high chemical stability. Recently non–ferrous reinforcement, BFRP bars are regarded as a potential alternative material to replace traditional steel bar in reinforced concrete structures subjected to extreme corrosive environment, such as ocean concrete structures .

The bond-slip behavior, which affects bar anchoring, lap splice strength, concrete-cover requirement, serviceability, and ultimate states, is a key feature for the successful application of basalt fibre reinforcement bars as internal reinforcement in concrete structures . It should be noted that the bond-slip behavior of BFRP bars in concrete was different from that of steel bar . Although some achievements about the bond-slip behavior between BFRP bars and concrete have been made, most of them were focused on small size basalt bars (<Ф 10 mm). However, the bond-slip behavior between large size BFRP bars and concrete is different due to larger interfacial transition zone, internal bleeding, and smaller specific perimeter. In addition, long term bond-slip behavior of BFRP bars in concrete exposed to marine environment has not been clarified yet.

Basalt Rebar is available in 4-40mm diameters up to 5.5m length

Beyond Materials Group is a growing manufacturer of  basalt fibre materials and can meet your specification and quality requirements for a wide variety of custom applications. From our head office in Gold Coast we are able to ship our basalt products Australia wide. Non–ferrous reinforcement, BFRP

Gold Coast, Brisbane, Sydney, Adelaide, Melbourne, Perth.

05

Mar

Carbon Fibre Reinforced Polymer

Repairing and Strengthening of concrete structures with carbon fibre fabric and epoxy composites

Carbon fibre has very high tensile strength and is also very lightweight. When bonded to the exterior of a concrete column, beam, or slab, it can add significant strength without adding weight that would increase the load on foundations and other structural members. The composite material is called fibre-reinforced plastic (FRP). FRP wraps are easy to apply and can be used on any size or shape of structural member. Traditional techniques for strengthening, such as adding concrete and reinforcing steel around the outside of a structural member, external post-tensioning, or adding structural steel supports often are more expensive due to the extra work to get everything into place.

The primary reason to use this technique is to add strength to an existing structure. In some cases, it might be used on new construction. In appropriate applications, Carbon Fibre reinforced polymer strengthening can be 30% to 50% less expensive than traditional strengthening due to the ease of installation.

Carbon Fibre strengthening gaining in popularity is strengthening of concrete tanks, culverts, and prestressed concrete water pipes. The FRP layer not only strengthens the structure but provides an impermeable a layer of impervious materials to protect the structure from moisture intrusion and further corrosion.