11-05-2012, 12:44 PM
Basalt Fiber Reinforced Concrete and Polypropylene Fiber Reinforced
Concrete
FUBV_Test_Report.pdf (Size: 2.19 MB / Downloads: 284)
Brief introduction of Basalt Fiber (BCF)
In addition to high specific strength, high specific modulus, BCF also has excellent temperature resistance
(-260~700), anti-oxidation, anti-radiation, thermal and sound insulation, filtration, anti-compression
strength and high shear strength, high availability, and good cost performance. It is found in
nature as an inorganic non-metal material, and is a new basic material and high-tech fiber that can
satisfy the demand for the development of basic infrastructures.
The technical specifications of basalt fiber are laid out in table 1 and table 2. (1) The naturalness
of raw material. Since the raw material of BCF is naturally found in the form of volcanic
extrusive rock, it has natural chemical and thermal stability and does not possess any known
health risks. (2) Comprehensiveness of performance. Basalt fiber is a “multi-performance” fiber.
For example, it is resistant to alkalis and acids; it is thermally, electrically and sound insulated;
its tensile strength can be greater than large-tow carbon fiber, its elongation is better than smalltow
carbon fiber.
Basalt has a 3-dimentional molecule and when compared with single infiltrating linear
polymeric fibers, it has higher anti-compressive strength, shear strength, adaptability in any harsh
environment, anti-aging, as well as other excellent characteristics. (3) Cost effectivness. Basalt
fiber for cement and concrete is not expensive, it is a competitive alternative product of
polypropylene fiber and polyacrylonitrile fiber. (4) Natural compatibility. Basalt fiber is a typical
ceramic fiber, it’s easy to disperse when mixed with cement concrete and mortar. Fresh basalt
fiber reinforced concrete has good characteristics, such as volume stability, good workability,
good stability, excellent thermal resistance, anti-seepage, crack resistance and impact resistance.
Therefore, basalt fiber reinforced concrete serves the functions of reinforcement, crack resistance,
and can extend the life of construction in the fields of housing, bridges, highways, railways, urban
elevated roads, runways, ports, subway tunnels, the coastal protection works, plant facilities. BCF
is natural material and will bring revolutionary changes in construction and transportation.
Analysis of test results
5.1 After putting fibers into concrete, as the fibers evenly distribute in concrete, they effectively
prevent the disintegration of concrete and greatly improve the cohesive properties and
impermeability, slightly lower the slump of concrete, but reducing degree is poor. In this respect,
Basalt fiber and polypropylene fiber are basically the same, while polyacrylonitrile fiber has a
greater rate of decline.
5.2 In the case of similar volumes, the addition of fibers slightly lowers the compression strength
of concrete, reducing degree of the 3 fibers is basically same. In the case of lower volumes
(1.0kg/m2), reducing degree of compression strength is greater.
Conclusion
From the test data:
From the test situation, basalt fiber can totally replace polypropylene fiber and
polyacrylonitrile fiber. Currently, environmental protection and conservation of resources
are more critical, therefore, basalt fiber reinforced concrete will have a growing presence
in the construction field;
With its excellent properties, such as crack resistance, impact resistance, impermeability
and freeze resistance, basalt fiber is helpful for improving durability and increasing the
working life of concrete. Although using fiber will increase the cost of one cubic meter of
concrete, when considering the improved properties of concrete with fiber, the extended
working life, then its total cost is reduced;