15325Applications

Ultrahigh-strength concrete can be used for prestressed concrete structures and nuclear waste storage. A pedestrian bridge has been constructed using ultrahigh-strength concrete of 200 MPa in Canada. The footbridge was built with post-tensioned, precast elements made with FRC (fiber amount: 200 kg/m3, 12 mm long, and 0.2 mm in diameter). Each element was 6.8 m long, 4.2 m wide, and 3.5 m high. The web of the bridge was designed with concrete without fibers but confined in a steel tube. The cost of concrete with fibers is about US$1242 per cubic meter, whereas without fibers, the cost is US$332 per cubic meter. The advantages of using ultrahigh-strength concrete in constructing nuclear waste storage are its low porosity and the elimination of the need for transporting nuclear substances.

Strain, mm/mm

FIGURE 15.6 Comparison of stress-strain curves of reactive powder concrete to that of high-strength concrete.

Strain, mm/mm

FIGURE 15.6 Comparison of stress-strain curves of reactive powder concrete to that of high-strength concrete.

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