GOVERNMENT ENGINEERING COLLEGE, DAHOD

 ZALOD ROAD, DAHOD, GUJARAT-389151

Seminar On….

SUBJECT :- HIGHWAY ENGINEERING

SEMESTER :- 5Th CIVIL

DIVISON :- ( A )

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PAVEMENTSSR.NO NAME OF

STUDENTEN.NO

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DAMOR JIGNESH K.BILWAL DIVIYESH G.SANGADA JIGNESH S.BILWAL DILIP B.

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Types of Pavements

Pavement Design

• Pavement means surfacing layer only. • In terms of highway design, it means the total

thickness of road including surfacing , base & subbase, if any.

• Thus pavement includes all the structural layers of road structure lying on subgrade of the road

Parameters for Design of Pavements

• Design of pavements mainly consists of two aspects

• 1. Design mix of materials • 2. pavement thickness

Factors for Design of Pavements

• • Following factors are responsible for pavement design • 1. Climate : rainfall, Temp, Frost action • 2. Environment : Ht of embankment, foundation cutting • 3. Geometry: • 4. Pavement materials: they have to resist climatic

conditions ,durability, maintenance. • 5. Subgrade Soil : decides thickness of pavement • 6. Traffic : Repetitions, Speed, Wheel Loads , contact

pressure, volume of traffic , no of vehicles/day .

Design Approach for rigid Pavements

• Variables for design 1. Wheel Loads 2. Traffic 3. Climate 4. Terrain 5. Subgrade conditions 6. Properties of Cement Concrete

Components of CC pavement

Types of Rigid Pavements

• 1. Jointed Plain Concrete Pavement (JPCP) • – No temperature steel

• 2. Jointed Reinforced Concrete Pavement (JRCP) • – Temperature steel placed at mid height and discontinued at the joints

• 3. Continuously Reinforced Concrete Pavement (CRCP) • – Not popular in India – very costly

• 4. Prestressed Concrete Pavement (PCP) • – Not popular

Design Approach for rigid Pavements

• • Cement Concrete roads provides a highly rigid surface and hence for the success of such roads, following two conditions should be satisfied

1. They should rest on non- rigid surface having uniform bearing capacity.

2. The total thickness or depth of the concrete pavement & the non rigid base should be sufficient to distribute the wheel load on a sufficient area of subbase so that the pressure on unit area remains with the permissible SBC of the soil.

Design Steps ( parameters )

1. Traffic parameters : Design Wheel load, Traffic intensity 2. Environmental parameters : temp differential ( CRRI

table) 3. Foundation strength k ( modulus of subgrade reaction ) 4. Foundation surface characteristics ( As per IRC ) 5. Concrete characteristics ( IRC :58-1988 ) 6. Modulus of elasticity 7. Coefficient of thermal expansion. 8. Design slab

thickness

Purpose of joints in Concrete Roads

1. To absorb expansion & contraction due to variation in temperature. ( horizontal movements of slabs)

2. 2. To avoid warping of slab edges 3. 3. To grant facility in construction .

Design Approach for Flexible Pavements

• Traffic is considered in terms of the cumulative number of standard axles (8160 kg) to be carried by the pavement during the design life • For estimating the design traffic, the following Information is needed:

1. Initial traffic after construction (CVPD) 2. Traffic growth rate during the design life 3. By studying the past trends of traffic growth 4. As per the econometric procedure outlined in

IRC:108

Design Approach for Flexible Pavements

Steps in design of flexible pavements

• The following steps are used in design of flexible pavements for stage construction.

i) Provide design thicknesses of subbase and base courses for 20 years.

ii) Provide bituminous surfacing course for traffic of msa. iii) Provide a shoulder of thickness equal to that of the sum

of the layers in steps (i) and (ii) on both sides. iv) Provide bituminous surfacing course for traffic of msa

after 10 years. v) Provide shoulder thickness equal to the thickness

calculated in step (iv) at the same time

Life Cycle Cost Analysis of rigid & Flexible Pavements

• According to a rough estimate ,the physical & financial needs of highway sector for the next 20 years indicates an average annual outlay of Rs 250000 Crores in the next 10 years & Rs 37500 Crores in the next subsequent period.

• In addition to this, Rs 10000 Crores per year would be required for maintenance with a steady increase of 5 to 6 %