There is a difference in runway thickness between international airports and local small airports: the concrete thickness laid on the runway of a general airport is not less than 30 centimeters; Large international airports need to withstand the takeoff and landing of large aircraft such as the Boeing 747, and the runway thickness must not be less than 35 centimeters. As for the requirements for the design strength, wear resistance, durability, and workability of concrete, they must comply with the industry standards of the People's Republic of China, the Technical Specification for Construction of Cement Concrete Surface Layer in Civil Airports MH5006-2015. The cement concrete paving of civil airport runways should not only focus on the minimum thickness requirement, but more importantly, ensure the design strength, wear resistance, durability, and workability of the configured concrete. In cold regions, it should also meet the requirements of frost resistance.
In the airport reconstruction project, the ramp section of the connecting road needs to be raised by 0-10 cm on the original airport pavement. In order to fully utilize the original cement concrete pavement, steel fiber reinforced concrete is used for the concrete added to the ramp section of the connecting road Compared with ordinary concrete, steel fiber reinforced concrete not only saves costs but also shortens the construction period The road performance enhancement of steel fiber reinforced concrete includes the raw materials and mix composition used, as well as the construction process of steel fiber reinforced concrete
Design strength of cement concrete for airport pavement
Under the influence of factors such as wheel load and temperature changes, concrete slabs will generate compressive stress and flexural tensile stress. The compressive stress on the concrete slab is relatively small compared to its compressive strength, while the ratio of the flexural tensile stress to its flexural tensile strength is relatively large, which may lead to cracking and damage of the concrete slab. Therefore, in the design of cement concrete pavement, the flexural tensile strength is used as the design standard for concrete strength.
According to the "Design Specification for Cement Concrete Pavement of Civil Transport Airports", airports with flight zone indicators II of A and B shall have a concrete pavement design flexural tensile strength of not less than 4.5 MPa; For airports with flight zone indicators II of C, D, and E, the designed flexural tensile strength of the pavement concrete shall not be less than 5.0 MPa
