Rural areas are generally national standard four-level highways, and the four-level highways are 20-24 cm; What is light flow? 22cm, although no minimum thickness is specified, the minimum thickness of steel fiber reinforced concrete surface is required to be 14cm. According to the fact that the thickness of steel fiber reinforced concrete pavement is usually 0.65~0.75 times that of ordinary concrete pavement, the minimum thickness of ordinary cement concrete should be 18~2 1cm.
Extended data:
Strictly speaking, the thickness of cement slab should be calculated according to the cumulative times of standard axial load in the reference period of route design, and many factors such as flexural and tensile strength modulus of base course and cement concrete should be considered.
Through the work practice in recent years, combined with the requirements of the specification. When using cement concrete pavement in rural roads, the thickness of cement slab should be determined according to two different situations:
The first is to make lime-fly ash macadam base. The thickness of the second and third grade roads shall not be less than 20cm, and the thickness of the fourth grade roads shall not be less than18cm; ;
Two, do not do lime-fly ash macadam base, mainly refers to the four-level highway. The original old road is a four-class highway, asphalt pavement or gravel pavement. When the strength meets the requirements, that is, the pavement deflection value is ≤ 130(0.0 1mm), and the potholes are repaired and leveled, the 20cm cement concrete pavement can be paved directly.
This can not only meet the requirements of long-term use, but also save investment. For economically underdeveloped areas, the pressure of raising matching funds can be reduced, and the task of rural road construction can be successfully completed. It should be emphasized that the thickness of cement slab cannot be separated from the environment and traffic conditions where the road is located. It is suggested that the thickness of cement slab should not be less than 22cm for the township four-level highway with heavy traffic and transportation.