As per IRC recommendations, the maximum spacings of expansion and contraction joint in rigid pavements are respectively

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BPSC AE Paper 6 (Civil) 11 Nov 2022 Official Paper
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  1. 140 m, 4.5 m
  2. 25 m, 40 m
  3. 140 m, 45 m
  4. 45 cm, 4.5 m

Answer (Detailed Solution Below)

Option 1 : 140 m, 4.5 m
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Explanation:

Movement joints:

When the concrete is placed, it will contract slightly during the curing process, this is the primary cause of small surface cracks that appear during the curing process. When concrete sets, it will expand and/or contract slightly with ambient temperature.

Hence we need to provide movement joints in the concrete pavements or slab

Various types of movement joints provided in the cement concrete pavement are:-

1) Expansion joints 2) Contraction joints 3) Construction joints

Expansion joint:

  • These are provided to allow the expansion of pavement due to a rise in temperature with respect to construction temperature.
  • The maximum spacing between the expansion joint is 140 m.

F1 Neel Madhu 15.04.20 D5

Contraction Joints: 

  • These joints are intended to control the cracks in a slab that are developed due to the stresses caused by moisture-related concrete shrinkage, thermal contraction, temperature warping.
  • They may be oriented transversely (i.e. perpendicular to the direction of traffic flow) or longitudinally (i.e. parallel to the direction of traffic flow).

According to IRC 15: 2002, The maximum spacing of contraction joints is given in the below table:

Categories of slab

Slab Thickness

(cm)

Maximum Contraction

Joint Spacing (m)

Unreinforced Slabs 10 4.5
15 4.5
20 4.5
Reinforced Slabs 10 7.5
15 13.0
20 14.0
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