NewsRecently, the Xiamen Xiang'an Airport project successfully implemented the construction of the landing test section of the scientific research project "Mechanized double-layer continuous paving of airport concrete pavement".
This test section used two Wittgen sliding mode pavers - SP 64i and SP 500, achieving the effect of "double-layer continuous paving, layered vibration, and one-time forming" of high-performance concrete pavement, providing a forward-looking paradigm for airport pavement construction in complex coastal environments in China with a longer lifespan. (Click to view the application case of Jinan Yaoqiang Airport)
The complete set of key technologies for mechanized construction technology and quality control of high-performance concrete pavement for double-layer continuous paving is jointly established by Sichuan Field Road and Tongji University. The goal is to provide a replicable and promotable airport construction paradigm for airport pavement construction in complex coastal environments such as Xiamen Xiang'an New Airport, and to build a pavement system with "long service life, low intervention, and high reliability", achieving the goal of 50 years without major repairs.
Double layered paving shapes a new paradigm for airport pavement construction
In traditional airport pavement construction, a single layer of cement concrete is usually used for paving, and the entire section uses a uniform concrete mix ratio (click to view the case).
The "double-layer continuous laying" technology used in the Xiamen Xiang'an Airport test section has achieved a dual breakthrough in materials and structure. This scientific research practice is carried out in experimental sections 2, 4, and 6 as independent warehouses, and in sections 1, 3, and 5 as filled warehouses.
The lower layer uses ordinary concrete as the load-bearing structure, while the upper layer uses high-performance cement concrete as the functional layer. Two Wittgen sliding mode pavers work together in front and behind to achieve "wet to wet" continuous paving, ensuring a tight bond between the upper and lower layers of concrete.
This process divides the pavement into two layers of continuous paving construction, allowing different layers to flexibly choose different mix proportions of concrete according to project requirements, providing more choices for project construction.
While ensuring the structural strength, in order to achieve the goal of effectively saving resources and costs, the upper layer continues to use conventional river sand concrete materials, while the thicker lower layer serves as the load-bearing structure, and low-cost machine sand concrete can be used to replace conventional river sand concrete;
To meet the needs of higher strength and durability of the overall pavement, conventional river sand concrete materials can be continued to be used in the thicker lower layer, and even replaced with machine sand concrete materials. The thinner upper layer is designed as a functional layer using high-performance cement concrete.
In the implementation process of this innovative technology, Wittgen's two positive laying sliding mode pavers SP 64i/SP 500 played a key role. SP 64i, with its powerful power and intelligent control system, is responsible for the relatively thick lower layer concrete paving, ensuring a dense and smooth base layer.
SP 500 is responsible for laying a relatively thin upper layer to ensure the quality of the functional layer. Two devices work together to achieve "wet to wet" continuous construction, with synchronous vibration and one-time molding of the upper and lower layers, avoiding the problem of poor bonding that may arise from layered construction.
