Joints in concrete pavements, Civil Engineering

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

Posted Date: 1/22/2013 4:56:03 AM | Location : United States







Related Discussions:- Joints in concrete pavements, Assignment Help, Ask Question on Joints in concrete pavements, Get Answer, Expert's Help, Joints in concrete pavements Discussions

Write discussion on Joints in concrete pavements
Your posts are moderated
Related Questions
30,000-yd 3 of banked soil from a borrow pit is stockpiled before being trucked to the jobsite.  The soil has 28% swell and shrinkage of 18%.  The final volume of the compacted so

how many rcc is use for 1 brass?

What is the minimum radius, R min , that can be used on a horizontal curve with a 70 mph design speed, a maximum superelevation, e max = 8%, and a side friction factor, f = 0.10?

Determine the nature of the soil A glass cylinder 5 cm internal diameter and with a screen at the bottom was used as a falling head permeameter. The thickness of the sample was

Question What is main difference in application of surface-protecting fenders and energy-absorbing fenders ? Answer Surface-protecting fenders are fenders that make

Calculate the Total Duration for the Four Activity Project Solution:      Scheduling work activity has associated time duration. The durations shown in the Table were e

Is there any application by using the third law of thermodynamics. A Actual application without explained the calculation

Q. Mosaic and P V C Tiles? The water sink at water points may be provided with mosaic lining at other than important station. Mosaic tiles also may be provided in flooring of

Question What is the sucker deck principle for changeable depth bridge decks ? Answer For a variable depth bridge deck, depth of continuous multi-span bridge deck is greate

The footprint of a proposed office building is overlaid on the existing contours topographic map of a sloping site as shown in the figure. The structural bays which are 65-ft by 65