EVOLVING CIVIL ENGINEER'S
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Practically using CBR test
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Prestressing losses in post-tensioned and pre-tensioned beams are respectively
Anonymous Poll
59%
a) 15% and 20%
28%
b) 20% and 15%
7%
c) 15% and 15%
6%
d) 20% and 20%
Expansion joints:

Expansion joints are placed in concrete to prevent expansive cracks formed due to temperature change. Concrete undergoes expansion due to high temperature when in a confined boundary which leads to cracks.

Expansion joints are provided in slabs, pavements, buildings, bridges, sidewalks, railway tracks, piping systems, ships, and other structures.

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We will be discussing in detail Types of expansion joints used in bridges
Finger Type expansion joints

Finger Type expansion joints used in bridge construction are an ideal component to accommodate bridge expansion and contraction while reducing the amount of noise pollution that occurs in other alternative joint types.

The primary components of the Finger Type expansion joint consist of steel plates (sliding) that are connected to each side of the road surface’s gap. Finger Joints are designed with in a (fingers of a hand) type of pattern, where the steel plates accommodate movement within one another & allow movement along the axis of the fingers themselves. Since there are no moving parts attached to the joint, cantilever moments reduce the stress induced to the structure. There is a large replaceable gutter below the joint which is made of reinforced neoprene and provides an efficient drainage system into the bridge’s ducts. The gutter also limits the build up of standing water to reduce the possibility of vehicles aquaplaning.

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Finger Type expansion joint
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Finger Type expansion joint
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Finger Type expansion joint
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The Modular Expansion Joint System (MEJS)

The Modular Expansion Joint System (MEJS) is a mechanical device installed in bridge expansion joint openings. The primary function of the MEJS is to permit vehicle traffic to travel smoothly across large expansion joint openings. It does this by dividing the large expansion joint openings into a series of smaller openings called cells. These cells work in series to accommodate the necessary thermal bridge movement (expansion and contraction) while providing a smooth riding surface for bridge vehicle traffic. The MEJS is normally used for expansion joints with a movement range exceeding 75 mm. The MEJS also has the secondary function of protecting the surrounding bridge superstructure and substructure. All MEJS cells are equipped with watertight sealing elements that prevent debris, water, and corrosives such as de-icing chemicals from passing through bridge expansion openings and damaging superstructure and substructure components.

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Modular Expansion Joint System (MEJS)

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Modular Expansion Joint System (MEJS)

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Modular Expansion Joint System (MEJS)
In application

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Modular Expansion Joint System (MEJS)

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Strip Seal joint:

Strip Seal is a mechanical device adapted for sealing an elongated gap formed between two adjacent road slab sections by providing a continuous support for vehicles crossing the gap while allowing the desired temperature responsive movement of the road slab sections. A single elastomeric neoprene rubber strip is secured to the adjacent roads sections on either side of the gap through heavy duty edge beams under a specially designed profile.


The Strip Seal Expansion Joint is mechanically secured between the space straddling the gap guaranteeing water tightness and also preventing ingress of debris and corrosives which otherwise cold damage the superstructure and substructure components. The planned operative movement range of the Strip Seal Expansion Joint is from 0-80 mm. Movements more than 80 mm can be accommodated by using a series of 80 mm openings (it acts as modular joint).

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Strip Seal expansion joint
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