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J

Joint

  1. A plane or parting in rock, normally involving no visible displacement. Joints often occur in parallel sets, cutting the rock into blocks.
  2. A discontinuity in any of the layers forming a road occurring either between the units or incidentally to the process of construction.
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Joule

The work performed when the point of application of a force of one newton is displaced through a distance of one metre in the direction of the force.

Symbol: J (=1Nm)

Letter: 

Jointing Sleeves

Insulating thimbles placed over the connected ends of detonator leads coupled in large rounds of shots, and over the connections between the detonator leads and the shotfiring cable.

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Job Evaluation

The techniques of helping to determine a fair day’s pay for a particular job. It is the assessment of the value of the job not the individual and must reflect fairly the skill, experience, responsibility and condition of the job.

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