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

Ground water, Two pumping wells 1,000 m away fully penetrate the same confi...

Two pumping wells 1,000 m away fully penetrate the same confined aquifer. One of the wells pumps at a rate of 1,240 m3/day. The second well pumps at 850 m3/day. If the aquifer has

Explain transpiration and infiltration, Explain Transpiration and Infiltrat...

Explain Transpiration and Infiltration Transpiration: The part of evaporation in which water vapor enters the atmosphere through the plants. The "transpired" water originated

Structural analysis and design, Scenario You are working as a structural...

Scenario You are working as a structural technician and have been charged with a range of jobs   involving analysis and design of a number of structural members. Task 1 a)

Distinguish among active and passive earth pressure, Distinguish among  'ac...

Distinguish among  'active' and 'passive' earth pressure. Describe clearly Rebhann's graphical construction method to evaluate the earth pressure on a retaining wall. What are t

Survey, Procedures of graphical interpolation

Procedures of graphical interpolation

Void ratio, why void ratio is greater for fine gained soil then course grai...

why void ratio is greater for fine gained soil then course grained soil.

Geotechnical engg., friction circle method of stability of slope

friction circle method of stability of slope

Explain situations that warrant a damage inspection, Explain Situations tha...

Explain Situations that warrant a damage inspection? - Floods - bridges located in streams, rivers and other waterways with known or suspected scour potential. - Build-up of

LEED, Need this assignment due in 10 hours

Need this assignment due in 10 hours

Practically the dielectric constant of air is taken as , Practically  the ...

Practically  the dielectric constant of air is taken as? Answer: The dielectric constant of air is taken as  unity.

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