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CONCRETE PAVEMENT

Methods of Construction:

1. Alternate bay method

2. Continuous method

Materials for Cement Concrete Pavement:

1. Cement

2. Coarse Aggregate

3. Fine Aggregate

4. Water

Equipment

1. Batching Plant Equipment

2. Mixers

3. Paving and Finishing Equipment

4. Concrete Saw

5. Forms

Various construction stages involved:

1. Preparation of Subgrade or sub-base

2. Fixing of Formwork

3. Batching of Materials

4. Mixing of Materials

5. Transporting and spreading of concrete

6. Compaction

7. Finishing

8. Curing

Joints in Pavements

Joints are constructed in concrete pavements due to ff factors:

1. To permit contraction and expansion of the concrete under the action of temperature and moisture changes.

2. To relieve warping and curling stresses due to temperature differential.

3. To prevent unsightly irregular breaking of the pavement.

4. As a construction expedient to allow for breaking in construction at the end of the day’s work.

5. To allow the pavement to be laid in lanes of convenient width.

This joints can be divided into:

1. Longitudinal joints- These joints are provided parallel to the center line of the road.

2. Transverse joints- These joints are provided at right angles to the center line of the rod.

Classification of Joints according to primary purpose:

1. Expansion joints

2. Contraction Joints

3. Wrapping Joints, and

4. Construction joints

Requirements of a good joint:

1. A joint must be waterproof at all times

2. A joint should not permit ingress of stone grits.

3. Joint must be permitted to move freely at all times.

4. A joint should not detract from the riding quality of a carriageway.

5. A joint should interfere as little as possible in concreting.

6. A joint should not be the cause of an unexpected structural weakness in pavement.

1. Expansion Joints

These joints are designed to provide space in the concrete to allow for the expansion of the slabs when the temperature at which the...