Composite technologiesResearches

Basalt fiber composite reinforcement for concrete

An adequate number of laboratory and bench-scale tests to evaluate the feasibility of using basalt fiber as concrete reinforcement have been performed and relative advantages evaluated.

Necessary rock studies of the gabbro and andesite basalt groups for the suitability as the raw material base for the production of continuous basalt fiber (CBF). A unique technique including laboratory melting and pilot-industrial melting at the high-tech equipment.

Continuous basalt fibers, 7µm-15µm in diameter, exhibit exceptional mechanical characteristics (tensile strength, modulus) in combination with excellent flexibility and chemical stability in cement and alkaline media. The epoxy-bonded pultrusion basalt-fiber composite containing 80% fibers (9µm-15µm in diameter) provide mechanical characteristics superior to those of glass-fiber reinforced composites currently available in the U.S.

Under optimum conditions (resin, fiber content, fiber direction, dimension, etc.), standard basalt-fiber composite specimens containing roving RB12, produced by RTM, show tensile strengths and moduli of elasticity twice that of E-glass fiber composite.

Basalt-fiber composite rod (rebar) could potentially replace steel bar in reinforced concrete, providing higher strength and durability in areas where corrosion is a problem. Tests of the mechanical characteristics of basalt fiber-reinforced concrete specimens have been provided. Concrete reinforced with 7%-10% coarse basalt fiber and concrete extruded from the mixture of Portland cement with 3vo continuous basalt fibers 7µm in diameter (chopped roving fibers 50mm-70mm in length) appear to have a higher level of strength, modulus and flexural properties than conventional and glass-fiber reinforced concrete.

Vladimir B. Brik, Research & Technology, Inc. Madison, Wisconsin.

 

 

Industries: Construction

Technologies: Pultrusion

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