DESIGN OF GRADE SLAB FOR UDL & WHEEL LOADS :
( Actual program is included in Super Civil CD )
 PROGRAM INFO / LIMITATIONS.
This program designs grade slab for uniformly distributed load & wheel loads , without requiring any load transfer reinforcements.
The width of slab is usually kept as 5.0 to 6.0 M. Construction joint  spacing of 5.0 to 6.0 M is most preferred. It is formed by providing a continuous dummy groove or saw cut in the top portion of the grade slab. The width of groove is 8 to 10 MM & depth 1/5 th of the slab thickness with a minimum of 25 mm & maximum of 50 MM. These joints are filled with hot applied sealing compounds complying with IS : 1834.
Expansion joints shall be provided at a spacing of 25 to 30 M. These joints are meant to accommodate the expansion, hence are provided with a clear gap for the full depth between adjacent slab. 
Depending up on the intended use the grade slabs can be provided with wearing/topping course. The topping course could be cast monolithic with the base slab. However slab requiring high abrasive resistance, a suitable topping course with an industrial hardener can be provided.
In case of weak soil, the modulus of subgrade reaction { K } could be improved by providing suitable sub-base below the grade slab. 
  Sr_No. Sub-Base Spec. % Increase in { K }
  1 Brick Soling 54 
  2 Stone Ballast 33
  3 Rubble Packing 36
  4 Lean Concrete 200
  5 Lean Concrete over Brick Soling 290
  6 Lean Concrete over Stone Ballast 255
  7 Lean Concrete over Rubble Packing 260
  8 WBM over Brick Soling 110
  8 WBM over Stone Ballast 83
  9 WBM over Rubble Packing 87

Approximate Modulus of Sub Grade Reaction (Kg/cm3) {K value}
 corresponding to CBR values.
C B R %
 2 3 4 5 7 10 20 50 100
K VALUE 2.08 2.77 3.46 4.16 4.84 5.54 6.92 13.85 22.16

Recommended temperature differentials in concrete roads of INDIA :
zone
Indian States
Temp. differentials in degree C. in slabs of thickness (mm)
100
150
200
250
300
1
Punjab, UP, Rajasthan, Gujarat,Haryana & north MP { * }
10.2
12.5
13.1
14.3
15.8
2
Bihar, Bengal, Assam & eastern Orrisa { * }
14.4
15.6
16.4
16.6
16.8
3
Maharashtra, Karnataka, South MP, Andra, Western Orissa & North Chennai { * }
14.75
17.3
19
20.3
21
4
Kerala & South Chennai 
{ * }
13.2
15
16.4
17.6
18.1
5
Coastal Areas Bounded by Hills
12.8
14.6
15.8
16.2
17
6
Coastal Areas Un Bounded by Hills
13.6
15.5
17
19
19.2
{ * } : Excluding hilly regions & coastal areas.
Temperature differentials represents difference in temperature between top & bottom surface of      pavement.