Comparision Between Rigid and Flexible Pavement
Report on
ENGINEERING COMPARISON BETWEEN FLEXIBLE AND RIGID PAVEMENT
Submitted by .
Md. Tahmidul Islam Farabi
06 02 03 031
4th Year 2nd Semester
Department of Civil Engineering
Ahsanullah University of Science & Technology
Pavement
The road pavement is the actual surface on which the vehicles will travel. It's purpose is two fold, to provide friction for the vehicles and to transfer normal stresses to the underlying soils.
Typically, pavements are built for three main purposes: 1. Load support: Pavement material is generally stiffer than the material upon which it is placed, thus it assists the in situ material in resisting loads without excessive deformation or cracking. 2. Smoothness: Pavement material can be placed and maintained much smoother than in situ material. This helps improve ride comfort and reduce vehicle operating costs. 3. Drainage: Pavement material and geometric design can effect quick and efficient drainage thus eliminating moisture problems such as mud and ponding (puddles).
Types of pavements
1. Flexible pavement 2. Rigid pavement
The pavements can be classified based on the structural performance into two, flexible pavements and rigid pavements. In flexible pavements, wheel loads are transferred by grain-to-grain contact of the aggregate through the granular structure. The flexible pavement, having less flexural strength, acts like a flexible sheet (e.g. bituminous road). On the contrary, in rigid pavements, wheel loads are transferred to sub-grade soil by flexural strength of the pavement and the pavement acts like a rigid plate (e.g. cement concrete roads). In addition to these, composite pavements are also available. A thin layer of flexible pavement over rigid pavement is an ideal pavement with most desirable characteristics. However, such pavements are rarely used in new construction because of high cost and complex analysis required.
Flexible pavement
Are
ENGINEERING COMPARISON BETWEEN FLEXIBLE AND RIGID PAVEMENT
Submitted by .
Md. Tahmidul Islam Farabi
06 02 03 031
4th Year 2nd Semester
Department of Civil Engineering
Ahsanullah University of Science & Technology
Pavement
The road pavement is the actual surface on which the vehicles will travel. It's purpose is two fold, to provide friction for the vehicles and to transfer normal stresses to the underlying soils.
Typically, pavements are built for three main purposes: 1. Load support: Pavement material is generally stiffer than the material upon which it is placed, thus it assists the in situ material in resisting loads without excessive deformation or cracking. 2. Smoothness: Pavement material can be placed and maintained much smoother than in situ material. This helps improve ride comfort and reduce vehicle operating costs. 3. Drainage: Pavement material and geometric design can effect quick and efficient drainage thus eliminating moisture problems such as mud and ponding (puddles).
Types of pavements
1. Flexible pavement 2. Rigid pavement
The pavements can be classified based on the structural performance into two, flexible pavements and rigid pavements. In flexible pavements, wheel loads are transferred by grain-to-grain contact of the aggregate through the granular structure. The flexible pavement, having less flexural strength, acts like a flexible sheet (e.g. bituminous road). On the contrary, in rigid pavements, wheel loads are transferred to sub-grade soil by flexural strength of the pavement and the pavement acts like a rigid plate (e.g. cement concrete roads). In addition to these, composite pavements are also available. A thin layer of flexible pavement over rigid pavement is an ideal pavement with most desirable characteristics. However, such pavements are rarely used in new construction because of high cost and complex analysis required.
Flexible pavement
Are
References: 1. http://training.ce.washington.edu/wsdot/ 2. http://www.acpa.org/ 3. http://www.enggpedia.com [pic] ----------------------- Photo courtesy WSDOT