Recently，China Civil Airport Pavement Concrete Double-layer Paving Technology Test is Successfully Implemented in Shandong Jinan Yaoqiang International Airport East Airfield Road Project。The project for Wittgen“Wet on wet“First application of double-layer cement concrete paving technology in domestic civil aviation field。

Cement concrete double-layer paving technology is a mature technology of Wirtgen Group for many years.，It has been successfully verified and applied in many large foreign airport projects, including Ulan Bator Airport in Mongolia and Brandenburg Airport.。

Construction steps

The test site is located in the east flight area of Yaoqiang International Airport in Jinan, Shandong Province.，This technology is driven in the paving direction by two Wittgen slipform pavers，The one in the front is responsible for paving the lower layer.，The lower layer is thicker，As a load bearing layer。

The next one is responsible for paving the upper layer.，As a functional layer。Two slip-form pavers, one in front and one in the back, realize concrete“Wet on wet”Paving operation，Effectively ensure the effective combination of the upper and lower layers of concrete，Meet the design and construction requirements of airport pavement。

   After completion of double-layer paving，Napped finish

Technical advantages

Generally, the pavement of domestic airports is paved with single-layer cement concrete.，Use the same concrete mix proportion for the whole plate。As a double-layer concrete structure.，The upper and lower layers of concrete may be of the same mix proportion，Two different mix proportions may also be used。

The lower layer, which is the load layer, is thicker.，The concrete mix proportion of conventional river sand can be used，Machine-made sand can also be used instead of river sand.，Even recycled aggregate can be utilized，Save costs while protecting resources。

The upper layer as the functional layer is thin，River sand concrete can continue to be used，Meet the needs of functional layers。As needed, of course，The upper layer can also be designed as high performance concrete，Improve the strength and durability of concrete。AtAspect of saving material cost，The potential is huge，There will be broad application prospects in the future.，It is worth discussing and studying.。

Attached：Some successful application cases abroad

· Project location：Berlin Brandenburg International Airport

· Main application：Airport runway and taxiway pave with double layer cement concrete

· Construction volume：1.5 million m² Cement concrete

· Construction data：Complete 40 at one time cm Paving of double-layer cement concrete slab；Wherein the thickness of the lower layer is 33 cm，The upper layer is 7 thick cm。

· Working width of large paver：12.5 m To 15 m

· Output of large paver：Reach 6000 in 24 hours m³

· Project location：Ulaanbaatar Airport, Mongolia

· Main application：Double cement concrete paving 3600 m Long、Sturdy 4E Grade C concrete airport runway

· Construction volume：1,350 million m² Cement concrete

· Construction data：Complete 38 at one time cm Paving of double-layer cement concrete slab；Wherein the thickness of the lower layer is 27 cm，The upper layer is 11 thick. cm。

· Working width of large paver：11.25 m To 16 m