Answer:
Considering the given data with the parameters stated, the spacing of contraction joint with 5 in slump can be 15 ft.
Considering the given data with the parameters given, the spacing of contraction joint with 3 in slump can be 20 ft.
Step-by-step explanation:
Ideally, the typical spacing of the contraction/control joints are based on the follolwing parameters listed below:
a)Slab thickness
The recommended spacing is 24 to 36 times the slab thickness
b)Aggregate size
Given slab thickness above,the spacing of the control joint is decided based on the the aggregate size in the concrete. For the aggregate which is greater/larger than 3/4 inch, the spacing of the control/contraction joints ranges from 3.75ft to 7.5 ft for the slab thickness which varies from 5 inches to 10 inches respectively
c)Slump
Lastly, the slump of the concrete should also be considered to fix the spacing of the control/contraction Joint. The greater the slump , the lesser the spacing between the control/contraction joints.This is due to the fact that shrinkage will be more ,if the slump is more.
-Recommended spacing of control/contraction joints with 5 in slump.
Therefore, considering the given data with the above parameters the spacing of contraction joint with 5 in slump can be 15 ft.
-Recommended spacing of control/contraction joints with 3 in slump.
Considering the given data with the above parameters the spacing of contraction joint with 3 in slump can be 20 ft.