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Where are the desirable locations of construction joints?

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Construction joints are normally required in construction works because there is limited supply of fresh concrete in concrete batching plants in a single day and the size of concrete pour may be too large to be concreted in one go.

The number of construction joints in concrete structures should be minimized. If construction joints are necessary to facilitate construction, it is normally aligned perpendicular to the direction of the member. For beams and slabs, construction joints are preferably located at about one-third of the span length. The choice of this location is based on the consideration of low bending moment anticipated with relatively low shear force. However, location of one-third span is not applicable to simply supported beams and slabs because this location is expected to have considerable shear forces and bending moment when subjected to design loads. Sometimes, engineers may tend to select the end supports as locations for construction joints just to simplify construction.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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Comments
  • Nlynn December 16, 2010 at 12:53 am

    Can we put the construction joint on 1/3 of slab (precast + insitu)?

    • Aneesh April 18, 2013 at 10:47 am

      Yes… Its done.. But let us know the reason

  • Er. Shankar Lal February 8, 2013 at 1:09 am

    I am in need location of construction joints in foundation raft of 47.04X15.49 met.

  • Vinod kumar November 11, 2015 at 6:46 pm

    Can we provide construction joint in slab/beam at 2/3 rd of span..?

  • max lee December 8, 2015 at 8:49 pm

    can put construction joint at one per third span ofa car park’s rc ramp?

  • raja December 28, 2016 at 12:49 am

    can we provide construction joint in raft

  • DON QUEK October 24, 2019 at 9:32 pm

    Is there a simple means of determining the width of an expansion joint in a building structure
    How long must a building structure be before introducing an expansion joint.

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