Joints in concrete pavements, Civil Engineering

Assignment Help:

Joints in Concrete Pavements:

Concrete pavements in India are of the jointed plain (unreinforced type). The following types of joints are needed in them :

(a) Transverse Contraction Joints

(b) Longitudinal Joints

(c) Expansion Joints

Transverse contractions are provided at 3.5-5.0 m spacing for relieving the tensile stress induced when the temperature of the concrete falls below the laying temperature. The modern practice is to lay the slab continuously and cut the transverse joints to a depth of 1/3rd the slab thickness by a joint cutting saw, and allow the crack to travel downwards in due course. A dowel bar is provided to transfer the load. For low volume roads, the dowel bars are omitted and the load transfer takes place by aggregate interlock. A sketch of a contraction joint is given in Figure. The joint is sealed with a sealant.

1853_Joints in Concrete Pavements.png

Figure: Contraction Joint

Longitudinal joints are provided on pavements which are wider than one lane to relieve warping stresses. They are also cut by joint cutting saws. Tie rods are provided to prevent the adjoining slabs from separating. The joints also need to be sealed. A sketch of a longitudinal joint is given in Figure.

1809_Joints in Concrete Pavements1.png

Figure: Expansion Joint

Expansion joints are provided to allow for the expansion of slabs. The current practice is to provide expansion joints only at culverts and bridges. A typical expansion joint is shown in Figure.

549_Joints in Concrete Pavements2.png

Figure: Longitudinal Joint with Tie Bar


Related Discussions:- Joints in concrete pavements

Construction of the building, a) Certain data for the materials used in the...

a) Certain data for the materials used in the construction of the building, e,g, insulation, building materials, air spaces, etc.  b)  Draw, with appropriate dimensions, the cro

Leveling., what is the errors faced in leveling

what is the errors faced in leveling

What is bore hole, What is Bore Hole In exploration of  area of  limit...

What is Bore Hole In exploration of  area of  limited extent  the borings should preferably be located near the comers of  the area. A minimum of three holes should be made un

Pulverized fly ash as cement replacement, Q. Pulverized fly ash as cement r...

Q. Pulverized fly ash as cement replacement? Pulverized fly ash is a type of pozzolans. It is analuminous or siliceous material that possesses no binding ability by itself. Whe

Explain about best hydraulic section, Q. Explain about Best hydraulic secti...

Q. Explain about Best hydraulic section? The best hydraulic section of an open channel is considered by provision of maximum discharge with a given cross sectional area. Chann

Determine the meaning of prestressed concrete, Determine the meaning of Pre...

Determine the meaning of Prestressed Concrete It is a type of concrete in which permanent internal stresses of  a suitable nature, magnitude and distribution are intentionally

Assessing maintenance needs, Assessing Maintenance Needs: Maintenance...

Assessing Maintenance Needs: Maintenance needs can be assessed by a careful inspection of roads at regular intervals, observing defects such as : potholes cracks

Settlement due to lowering of water table, Q. Settlement due to Lowering of...

Q. Settlement due to Lowering of Water Table? Water table is encountered with, whenever any excavations are made for foundations. The water is to be out for working conditions.

Point of virtual fixity of lateral loading for piles, Point of virtual fixi...

Point of virtual fixity and critical length of lateral loading for piles Some engineers can get confused about the difference between the two terms which are point of virtual

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd