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

Depth of boring for multi-storeyed building, Depth of Boring  for Multi-st...

Depth of Boring  for Multi-storeyed Building Peck has recommended that first drill hole is to be made up to depth at which the presence of a thick layer of soft clay with a hig

Direct levelling, to find height difference between two or more points in d...

to find height difference between two or more points in different conditions

Highway Engineering, I am a Civil Engg student. Why CBR Values determined ...

I am a Civil Engg student. Why CBR Values determined only at 2.5 and 5 mm penetration ?.

Test on complete bearings, Q. Test on complete bearings? Two bearings s...

Q. Test on complete bearings? Two bearings should be selected at random from the 'lot'. Various tests should be conducted on these 'test bearings'. These bearings should be exc

Dams, types of dams

types of dams

Simply-supported beam, A simply-supported beam (AB) with an overhang (BC) i...

A simply-supported beam (AB) with an overhang (BC) is illustrated in Figure 1(a), with the cross-sectional details given in Figure 1(b). The dead load comprises self weight only; f

Counter map, how will you determine the intrtvisibility of a point if the c...

how will you determine the intrtvisibility of a point if the counter map is given to you? explain by giving an exampe

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