New Unbonded Prestressed Steel Strand Successfully Developed, Boosting Green and Low-Carbon Bridge Engineering
2019-12-10
Recently, a new type of unbonded prestressed steel strand, jointly developed by a technology company and a university, officially passed testing by a national authoritative institution. The product's performance indicators surpass current national standards, achieving significant breakthroughs in corrosion resistance, fatigue resistance, and environmental performance. This provides new material support for the green and low-carbon construction of bridge engineering. The product has already been successfully applied in a river-crossing bridge project in the Pearl River Delta region, with expectations to extend the service life of the bridge's prestressed structures by over 15 years and reduce lifecycle maintenance costs by 30%.
Recently, a new type of unbonded prestressed steel strand, jointly developed by a technology company and a university, officially passed testing by a national authoritative institution. The product's performance indicators surpass current national standards, achieving significant breakthroughs in corrosion resistance, fatigue resistance, and environmental performance. This provides new material support for the green and low-carbon construction of bridge engineering. The product has already been successfully applied in a river-crossing bridge project in the Pearl River Delta region, with expectations to extend the service life of the bridge's prestressed structures by over 15 years and reduce lifecycle maintenance costs by 30%.
According to the head of the research and development team, the new unbonded prestressed steel strand utilizes an independently developed environmentally friendly anti-corrosion coating material, replacing traditional oil-based coatings. This not only addresses the poor environmental performance and susceptibility to aging of conventional products but also enhances the bonding stability between the coating and the steel strand, improving corrosion resistance by 60% in salt spray environments. Additionally, the production process adopts a fully enclosed circular process, achieving zero wastewater and gas emissions and reducing energy consumption per unit product by 25%. Test reports indicate that the product's ultimate tensile strength reaches 1,860 MPa, with a fatigue life exceeding 2 million cycles, fully meeting the high-load requirements of large-scale cross-sea and cross-river bridges. Currently, the product has obtained three national invention patents and is being promoted and applied in multiple key bridge projects across the country. It is expected to drive the transformation and upgrading of China's bridge prestressed material industry.
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