What are tie bars and dowel bars?

Tie bars are not load transferring device. For instance, tie bars are used in longitudinal joints in concrete pavement. Dowel bars are smooth round bars which mainly serve as load transfer device across concrete joints. They are placed across transverse joints of concrete pavement to allow movement to take place.

How are dowel bars provided?

(ii) The dowel bars are provided in the direction of the traffic (longitudinal). Half length of this bar is bonded in one cement concrete slab and the remaining portion is embedded in adjacent slab, but is kept free for the movement during expansion and contraction of the slab.

Where are dowel bars used?

Dowel bars are commonly used in jointed plain concrete pavements (JPCP) as a load transfer device across joints, especially for pavements with heavy traffic.

What are tie bars used for?

Tie bars are deformed, epoxy coated steel bars, typically placed mid‐depth across longitudinal joints or between an edge joint and a curb or shoulder. They are designed to prevent lane separation and differential deflection and reduces transverse cracks by holding the faces of abutting slabs in contact.

What is dowel bar in column?

Dowel bars are short steel bars that provide a mechanical connection between slabs without restricting horizontal joint movement. They increase load transfer efficiency by allowing the leave slab to assume some of the load before the load is actually over it.

What is a tie bar in construction?

Why dowel bars are provided in column?

Explanation: Dowel bars are provided in reinforced concrete footings to transfer the load from columns (e.g. isolated square column footing) to the footing. They are necessary when the concrete bearing alone is not enough to transfer loading from the column to the footing.

What is the length of dowel bar?

Dowel bars are usually 32 to 38mm (1.25 to 1.5 inches) in diameter, 460mm (18 inches) in length and spaced 305mm (12 inches) apart.

What is dowel length?

The length of the dowel is generally determined by how much dowel can be inserted into the shortest member of the two piece joint. Twice this length is a common rule of thumb for determining dowel length. Generally, the diameter of the dowel should be no greater than half the thickness of the stock.

Why is a dowel bar necessary for rigid pavement?

Properly installed dowel bars are a vital part of the joint between two concrete pavement slabs. They allow freedom of movement in an otherwise rigid pavement structure, while also maintaining the essential connection of the pavement.

What is tie bar used for?

Tie Bars. Tie bars are deformed, epoxy coated steel bars, typically placed mid‐depth across longitudinal joints or between an edge joint and a curb or shoulder. They are designed to prevent lane separation and differential deflection and reduces transverse cracks by holding the faces of abutting slabs in contact.