Ancient bridges were primarily designed for pedestrian and animal traffic, with relatively low load-bearing requirement. However, with the advent of railways, the load that bridges had to carry increased exponentially. The standards for the gradient and curvature of the railway lines became more stringent, and the need to build a railway network to maximize economic benefits emerged. As a result, to span larger and deeper rivers, canyons, and other natural obstacles, bridges have been compelled to evolve towards longer spans.
ARIT excels at solving complex problems on large bridges, having accumulated numerous engineering case studies.
Name
Shanghai-Suzhou-Nantong Yangtze River Bridge
Shanghai-Suzhou-Nantong Yangtze River Bridge is a bridge connecting Suzhou and Nantong over the Yangtze River. It is the world's longest combined road-rail cable-stayed bridge and also the first bridge in the world with a span over a kilometer designed and built independently by China. The main tower of the bridge is constructed with C60 concrete, and the foundation is made with C50 concrete. The height of the main tower above the pier is 325 meters, making it the tallest in the world among combined road-rail cable-stayed bridges.
Due to the main tower's use of a one-time pumping process with a vertical pipeline exceeding 330 meters, the concrete is required to have good initial fluidity (spread ≥ 600mm, T500 ≤ 8 seconds) without segregation, and the fluidity should still be good after 3 hours (spread ≥ 600mm, T500 ≤ 10 seconds).
The project utilizes the self-developed viscosity-reducing high-performance water reducing admixture by ARIT, ensuring steady concrete construction quality and good appearance of the concrete and meeting the requirements for concrete construction.
For detailed remixing formula, feel free to connect technician of ARIT.
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