What are transverse joints?

What are transverse joints?

What are transverse joints? (1) Transverse Contraction Joint – a sawed, formed, or tooled groove in a concrete slab that creates a weakened vertical plane. It regulates the location of the cracking caused by dimensional changes in the slab, and is by far the most common type of joint in concrete pavements.

What is a longitudinal joint in concrete?

A longitudinal joint consists of a tie bar placed at the mid-depth of a concrete pavement and it is not intended for joint lateral movement. When uneven settlement occurs, the tie bars in longitudinal joints perform as hinges (Ministry of Transport (1955)) which allow for the settlement of concrete carriageway.

What are the three types of concrete joints?

Construction joints usually fit into three profiles, butt joint, key joint and dowel joint.

What are the different types of joints in cement concrete pavements?

Concrete pavement joints are commonly defined by their primary function (e.g., contraction or control joints, construction joints, isolation joints, and expansion joints). Within each of these types, they may be further described by their orientation (i.e., transverse or longitudinal).

What is the difference between a control joint and an expansion joint?

In building materials, a control joint is used to control cracking while an expansion joint is designed to handle structural movement. A control joint can be formed during placement of the building material or cut after the material is placed. …

What is the maximum spacing of expansion joints?

Expansion joint Maximum spacing of expansion joints range from 25-27 m in jointed reinforced concrete slabs, and from 40 m (for slabs <230 mm thick) to 60 m (for slabs >230 mm thick) in unreinforced concrete.

What is the difference between expansion joints and control joints?

A control joint is a continuous vertical joint filled with mortar, but with a bond breaker on one side so that tensile stress cannot develop across the joint. An expansion joint is a continuous vertical or horizontal joint, left completely free of mortar and filled with elastomeric sealant to keep it watertight.

What are the objectives of joints in cement concrete pavement?

Joints in Cement Concrete Roads Joints are provided in cement concrete road to allow expansion, contraction and warping of the slabs due to the variation in the temperature of slabs. Increase in temperature cause expansion of the slab horizontally.

What should be the spacing of transverse joints?

Transverse joint spacing is12 feet for pavements 6 inches thick, 15 feet for pavements 7 to 9 inches thick, and 17 feet for pavements over 9 inches thick. Longitudinal joint spacing for two lane streets, where lane delineation is not necessary, should be limited to a maximum of 10 feet.

Where do you build transverse joints in asphalt?

The transverse joint is thus built at a low point in the new pavement surface, resulting in a dip that will be felt by traffic. The FHWA says it is a much better practice to locate the transverse joint at a point where the head of material in front of the screed is normal.

What kind of joints are used in pavement construction?

All types of joints are used in rigid pavement construction methods for all pavement types. CRCP uses longitudinal reinforcing steel in order to limit the number of transverse contraction joints, but it still uses longitudinal joints and periodic transverse joints. Joints can be formed in two ways.

How are transverse contraction joints cut in traffic?

Transverse contraction joints can be cut at right angles to the direction of traffic flow or at an angle (called a “skewed joint”, see Figure 3). Skewed joints are cut at obtuse angles to the direction of traffic flow to help with load transfer.