flexible and rigid pavement

Rigid pavement life span is more as compared to flexible. Rigid pavements, on the other hand, can often serve 20 to 40 years with little or no maintenance or rehabilitation. Rigid pavement and Flexible pavement are the two types of road pavement design methods. 7. Based on design considerations there are two types of pavements i.e. • Jointed Plain Concrete Pavement (JPCP) 8. Generally this type of pavement requires some sort of maintenance or restoration every 10 to 15 years. Prof. Satish Chandra, Ph. contributing high quality surfaces for ride for the purpose of safe driving, they duty as structural layers to transmit automobile wheel loads in this way that the develop stresses transfer to the subgrade … It consists of one layer Portland cement concrete slab or relatively high flexural strength. Flexible Pavement versus Rigid Pavement 4- It should have sufficient friction without affecting the power of the vehicle. The fundamental difference between a flexible, semi-rigid, and rigid pavement is the load distribution over the subgrade. Following are some adverse conditions that require us to choose rigid pavement over flexible pavement: It relies on a combination of layers for transmitting load to the subgrade. Functions •Good Riding Surface •Resistance to weathering and vehicle load conditions •Structural Stability to transfer wheel loads safely. Wheel Load Distribution 6. Rigid pavements have a great amount of flexural strength or flexural rigidity. 6. Rigid pavement is designed and analyzed by using the elastic theory. Since there is only one layer of material between the concrete and the sub-grade, this layer may be called a base or sub-base course. Difference Between Flexible Pavement And Rigid Pavement PAVEMENT DESIGNS •Composition of Road Pavement: -Pavement Crust (Structure) -Sub Grade -Formation. Advantages of Rigid Pavement Rigid lasts much, much longer i.e 30+ years compared to 5-10 years of flexible pavements. Inflexible pavement surfacing cannot be laid directly on the subgrade but a sub base is needed. 8. The earliest record of the first constructed pavements is from the 4000 BC. . Flexible pavement uses more flexible surface course and distributes loads over a smaller area. Flexible pavement can be defined as the one consisting of a mixture of asphaltic or bituminous material and aggregates placed on a bed of compacted granular material of appropriate quality in layers over the subgrade. the cost of flexible pavement per kilometer was found outto have 7.9 Million ETB more than the rigid pavement because of the incurring costs of maintenance through its design life.Therefore, it is suggested that Portland Cement Concrete Pavement shall be used in (PCCP) pavement construction to cater local material requirements. The two most common types of highway pavement constructed widely are rigid pavement and flexible pavement. Get free access to the library by create an account, fast download and ads free. Mizanur Rahman CE 6505 Function of Pavement A highway This paper discusses the operating parameters for RDD testing and presents the results of RDD testing on rigid and flexible pavements. Rigid pavements provide very poor riding quality and are only used in special requirements. UNIT 3. In the long run it is about half the cost to install and maintain. Properties Flexible Rigid Design Principle Empirical method Based on load distribution characteristics of the components Designed and analyzed by using the elastic theory Material Granular material . Rigid pavement is the one made with concrete. Compared to flexible pavement, rigid pavements are placed either directly on the prepared sub-grade or on a single layer of granular or stabilized material. Rigid pavement life span is more as compared to flexible. A difference between the pavements is their reaction to weight loads. In flexible pavements load distribution is primarily based on layered system. FLEXIBLE PAVEMENT RIGID PAVEMENT 3. This chapter is applicable to the design of these types of structures. . • Jointed Plain Concrete Pavement (JPCP) 7. But the initial costs are somewhat high. DESIGN & CONSTRUCTION OF RIGID AND FLEXIBLE PAVEMENTS PAVEMENT DESIGNS •Composition of Road Pavement: -Pavement Crust (Structure) -Sub Grade -Formation Functions •Good Riding Surface •Resistance to weathering and vehicle load conditions •Structural Stability to transfer wheel loads safely Parameters for Pavement Design Flexible Rigid •Jointed Plain Concrete Pavement (JPCP) Properties Flexible Rigid Design Principle Empirical method Based on lo ad distribution characteristics of the component s D esigned and analyzed by usin g the elastic . Wheel Load Distribution 6. In Rigid pavement, the surfacing can be directly laid on the subgrade. Water bound macadam roads and stabilized soil roads with or without asphaltic toppings are examples of flexible pavements. Such pavements are substantially "stiffer" than flexible pavements due to the high modulus of elasticity of the PCC material. Flexible Rigid 6. 6. Rigid pavements, on the other hand, can often serve 20 to 40 years with little or no maintenance or rehabilitation. Types of Pavements 5. In the long run it is about half the cost to install and maintain. Cross Section of Rigid Pavement. Rigid pavement is constructed from reinforced concrete Rigid roads consist of three layers they are non-flexible roads concrete roads are the best example of the rigid roads. Flexible pavement, on the other hand, provides high riding quality but has reduced life and needs maintenance. Flexible Pavement - Introduction The type of highway pavement that transmits the imposed wheel load to the underlying layers by a grain-to-grain transfer mechanism is known as flexible pavement. Types of Pavements 4. Compared to flexible pavement, rigid pavements are placed either directly on the prepared sub-grade or on a single layer of granular or stabilized material. The Rigid pavement is designed to spread the load stresses to a wide region on the surface (Ramsamooj 99). • Jointed Plain Concrete Pavement (JPCP) 8. 2. Flexible pavement uses more flexible surface course and distributes loads over a smaller area. The RDD measures continuous deflection profiles rather than deflections at discrete points. In simple terms, a flexible pavement can be defined as a pavement layer comprising of a mixture of aggregates and bitumen, heated and mixed properly and then laid and compacted on a bed of granular layer. Flexible Rigid •Jointed Plain Concrete Pavement (JPCP) Properties Flexible Rigid Design Principle Empirical method Based on lo ad distribution characteristics of the component s D esigned and analyzed by usin g the elastic . Flexible and Rigid Pavement Any ground surface that you can step on which carries a considerable amount of weight or load is called a pavement. It consists of a series of layers with the highest quality materials at or near the surface of pavement. Flexible Rigid 7. Flexible pavement, on the other hand, provides high riding quality but has reduced life and needs maintenance. They consist of stone paved streets . 7. It relies on a combination of layers for transmitting load to the subgrade. Types of Pavements 5. •Problem: Allows moisture infiltration . Types of Pavements . These pavements do not show deformation on the pavement surface or deformation of lower layers due to the rigidity of the cement concrete slab. Difference Between Flexible and Rigid pavement Flexible pavements can be defined as one consisting of a mixture of asphaltic or bituminous materials and aggregate placed on a bed of compacted granular material of appropriate quality in layers over the subgrade. Download full Rigid And Flexible Pavement Design And Rehabilitation Issues books PDF, EPUB, Tuebl, Textbook, Mobi or read online Rigid And Flexible Pavement Design And Rehabilitation Issues anytime and anywhere on any device. It's flexible since the total pavement structure bends or deflects due to the traffic loads. These pavements range in composition from true flexible pavement to semi-rigid systems (including the full-depth or perpetual design). Flexible pavement have a low life span. Types of Pavements . Inflexible pavement surfacing cannot be laid directly on the subgrade but a sub base is needed. Road Pavement. Types of Pavements 4. Less Maintenance cost and Continuous Traffic and Flow. Since there is only one layer of material between the concrete and the sub-grade, this layer can be called as base or The pavement design is also one major factor, with flexible pavements reliant on subgrade strength and rigid pavement dependent on the flexural strength of concrete. Flexible and-rigid-pavements 1. Flexible pavement differ from rigid pavement in terms of load distribution. 2- It should be less slippery. Flexible pavements are designed to deform when a load is placed on the surface and transfer the pressure to the lower layers. Wheel Load Distribution 5. Two types of pavements are laid in India-rigid pavement and flexible pavement. 6. Since there is only one layer of material between the concrete and the sub-grade, this layer can be called as base or 17. Rigid pavements provide very poor riding quality and are only used in special requirements. FLEXIBLE PAVEMENT RIGID PAVEMENT 3. DESIGN FLEXIBLE AND RIGID PAVEMENTS 9 Design principles pavement components and their role Design practice for flexible and rigid pavements, (IRC methods only). Wheel Load Distribution . Properties Flexible Rigid Design Principle Empirical method Based on load distribution characteristics of the components Designed and analyzed by using the elastic theory Material Granular material . such as flexible pavements, rigid pavements are designed as all weather, long-lasting structures to provide advance day high speed vehicle. Rigid Pavement. The RDD measures continuous deflection profiles rather than deflections at discrete points. FLEXIBLE PAVEMENT RIGID PAVEMENT 4. Flexible Rigid 7. On the other hand, rigid pavements are composed of a PCC surface course. Structural Design Of Pavements Dr. Md. FLEXIBLE PAVEMENT RIGID PAVEMENT. Flexible pavements are designed to deform when a load is placed on the surface and transfer the pressure to the lower layers. a rigid pavement can be defined as a pavement layer include of a combination of aggregates and cement, it is blended precisely and then put and compacted on a bed of . Flexible pavements are constructed of several thicknesses of asphalt or bituminous concrete layers overlying a base of granular material on a . Following are some adverse conditions that require us to choose rigid pavement over flexible pavement: 6. 4.1 Rigid and Flexible Pavement Characteristics. In simple terms, a flexible pavement can be defined as a pavement layer comprising of a mixture of aggregates and bitumen, heated and mixed properly and then laid and compacted on a bed of granular layer. Rigid and Flexible Pavement. Grouted concrete roads are the types of semi-rigid pavements. It reflects the deformations of subgrade and subsequent layers on the surface. The functional requirement of Highway pavements are 1- Flexible pavement and Rigid pavement have good riding quality. Rigid pavements are constructed from cement concrete or reinforced concrete slabs. The Rolling Dynamic Deflectometer (RDD) is a relatively new tool for assessing the condition of pavements. 2- It should be less slippery. DESIGN FLEXIBLE AND RIGID PAVEMENTS 9 Design principles pavement components and their role Design practice for flexible and rigid pavements, (IRC methods only). A highway pavement is a structure consisting of superimposed layers of processed materials above the natural soil sub-grade, whose primary function is to transmit the applied vehicle loads to the sub-grade. While, in case of rigid pavements most of the load carries by slab itself and slight load goes to the underlying strata. The pavement surface should be durable and can withstand the load acting from the wheel tires. D. Director, CSIR-Central Road Research Institute, Delhi Two types of pavements are laid in India-rigid pavement and flexible pavement. Joint reflection cracking does not include reflection cracks that occur away from an underlying joint or from any other type of base (e.g., cement or lime stabilized). flexible pavement and rigid pavement. pavement design methods, developing guidelines with a protocol for considering rigid versus flexible pavement designs when allowed alternate bids, and developing the Alternate Pavement Design Analysis Tool (APDAT) for pavement type analysis. View Pavement Components lec-1.pptx from CE 6505 at Bangladesh University of Engineering & Technology. 7. A rigid pavement has a very high stiffness and distributes loads over a relatively wide area of subgrade - a major portion of the . 1. But the initial costs are somewhat high. In this pavement, the load is distributed by the slab action, and the pavement acts as an elastic plate. FLEXIBLE PAVEMENT RIGID PAVEMENT. One of the main disadvantages of it is the cost associated with the material and installation. This paper discusses the operating parameters for RDD testing and presents the results of RDD testing on rigid and flexible pavements. Unlike flexible pavement; rigid pavement acts as a slab and is capable of transmitting wheel load stresses to a wider area beneath by slab action. 7. In Rigid pavement, the surfacing can be directly laid on the subgrade. Rigid pavement has the ability to bridge small imperfections in the subgrade. 2. Rigid pavements are constructed by using Portland cement concrete (PCC). Rigid lasts much, much longer i.e 30+ years compared to 5-10 years of flexible pavements. The primary structural difference between a rigid and flexible pavement is the manner in which each type of pavement distributes traffic loads over the subgrade. Pavements are primarily constructed for use by vehicles and pedestrians, transferring the load from the upper surface to the natural soil. Flexible pavements are those which are surfaced with bituminous or asphalt materials. The main difference between the flexible and rigid pavements is based on the manner in which the loads are distributed to the subgrade. Rigid and Flexible Pavement. The Rigid pavement is designed to spread the load stresses to a wide region on the surface (Ramsamooj 99). Rigid pavements are constructed from cement concrete or reinforced concrete slabs. Wheel Load Distribution 5. Main advantage of it is that it is more durable and hence has longer life as compared to flexible pavements. 8. 1- Flexible pavement and Rigid pavement have good riding quality. Compared to flexible pavements, rigid pavements are laid either directly on a finished sub-grade or over a layer of granular or immobilized material. Key Words Flexible Pavement, Rigid Pavement, Life-Cycle Cost A difference between the pavements is their reaction to weight loads. Flexible Pavement. 3- It should be firm. The initial cost is very high as compared to that of flexible pavements. The cracks occur directly over the underlying rigid pavement joints. Description: Cracks in a flexible overlay of a rigid pavement. 1. Flexible pavement have a low life span. The Rolling Dynamic Deflectometer (RDD) is a relatively new tool for assessing the condition of pavements. The road pavement is the layered structure located directly above the subgrade, and beneath the wearing surface which transmits the applied vehicle loads to the sub-grade and underlying soil. A flexible pavement structure is generally composed of several layers of materials which can accommodate this "flexing". Flexible Rigid 6. 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