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Standard 70-meter long UHPC precast post-tensioned U-girder


Precast bridge construction

 


More than one hundred and twenty ultra-high-performance concrete (UHPC) bridges have been built in Malaysia since the year 2010. Among these, only six are footbridges whereases the rest were designed for traffic load as per BD37/01 [1] or Eurocode 1 [2]. The UHPC used in Malaysia is mainly structural grade, intended for use in precast pretensioned or post-tensioned concrete flexural members. Structural grade UHPC has been consistently produced by Dura Technology Sdn Bhd (DTSB). It consists of Portland cement-based materials optimized using particle packing theory to develop a minimum 28 days characteristic compressive strength of 140/155 MPa, and with high strength, high aspect ratio steel fibers that result in a minimum characteristic first and post cracking tensile strengths of fctk,el = 7 MPa and fctfk = 8 MPa, respectively; and minimum characteristic modulus of rupture of 20 MPa. The material has excellent post-cracking strain hardening, ductility, and toughness. Cast-in-placed UHPC (which is generally used as stitching concrete for precast components) has been produced as well. It has minimum 28 days characteristic compressive strength of 120/135 MPa, and minimum characteristic modulus of rupture of 15 MPa. Hardened UHPC has excellent durability represented by freeze-thaw resistance, water absorption, chloride permeability and abrasion resistance.

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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 10 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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