Difference between granular sub-base and wet mix macadam in payment structure:

The wet mix macadam mostly consists of laying spreading and compacting of clean, crushed, well-graded granular material that is prepared and approved granular sub-base.

Single compacted wet mix macadam player shall not be less than 75mm.

Whenever we are using vibrating compacting equipment then compacted depth of a single layer of the course of the subway may be up to 200 mm.

Wet mix macadam shall be prepared in an approved of water macadam mixing plant.

Here replacing the aggregate fraction should be retained on 22.4 mm sieve with materials of passing from 22.4 and written on 4.75 mm.

While the addition of water, the evaporation loss shall be considered the mixed material shall be uniformly wet and segregation will take place.    

Instrument used for survey are listed below:

1) Instruments for chaining:

A)Chain:

i) Metric Chain

ii) Gunter’s Chain

iii) Engineers Chain

iv) Revenue Chain

V) Steel Band or Band Chain

B) Tapes:

I) Cloth or linen tape

ii) Metallic Tape

iii) Steel Tape

iv) Invar Tape

C)Arrows

D) Pegs

E) Ranging Rods

F) Offset Rods

G) Plumb Bobs

2) Instrument for measuring horizontal & vertical angles:

I) Theodolite:

a) Transit Theodolite

b) Non-Transit Theodolite

3) Levelling Instrument: Dumpy Level