What are the functions of tie bars and dowel bars in rigid pavements What is the design principle?

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 the main difference between tie bar and dowel bar?

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.

What is the purpose of dowel?

Dowels are commonly used as structural reinforcements in cabinet making and in numerous other applications, including: Furniture shelf supports. Moveable game pieces (i.e. pegs) Hangers for items such as clothing, key rings, and tools.

Why mild steel is used in dowel bar?

A dowel bar is generally made up of short round mild steel bars used to provide the mechanical connection between more than one slab connected to the bars without resisting the horizontal movement at the joint of the bar.

What is the function of dowel bar?

Dowel bar is a short round, smooth steel rod used to provide a mechanical connection between slabs without restricting horizontal joint movement. These bars are mainly used in jointed plain concrete pavement (JPCP) to carry the additional stress and load induced due to the moving vehicle.

Why dowels are provided?

Dowel bars are offered for the purpose of transferring load across the concrete joints. They are used for reducing corner cracking. Dowel bars are also provided for reducing the joint faulting. The purpose of dowel bars is to improve the performance of the joints.

What is tie bar in rigid pavement?

Tie Bars are deformed steel bars, deformed epoxy coated steels, or connectors that are used to hold faces of rigid slabs in contact, as per AASHTO, 1993. Typically, tie bars are 12.5mm or 16mm in diameter and between 0.6 and 1.0 m long.

How dowel bars are provided?

Placement of the Dowel Bars For allowing movements, dowel bars are placed across transverse joints of concrete pavement. They are inserted at the middle depth of the slab and are coated with a bond-breaking material for restricting bonding to the PCC.