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                                                                                  Image Courtesy: Mr. C.D.Khandekar
       The solution
          The solution to both these problems is the same. The intensity of the jerk can be considerably reduced by allowing one
       wheel to cross the joint at one time. This can be done by changing the direction of the joint, preferably to 45° to the direction
       of travel. As a result, the intensity of jerk will reduce to one-fourth because one tire would cross the line at a time. In addition,
       the transition would take place at an angle, so it is smoother. This can be included as a part of specifi cations of the design.

          Roads are cast as a continuous slab. For expansion joints, it is cut with a diamond saw and the gap is fi lled with an elastomer.
       The same procedure can continue except that the cut would be at an angle of 15° to 45° to the direction of traverse. By doing
       this, the intensity of the noise will reduce below 10%, causing no damage to the vehicle and passengers.
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       Chemical Weekly  December 24, 2024                                                              173


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