Dr.Vilas Deshmukh

Dr.Vilas Deshmukh

Sunday, January 20, 2013

Pavement technology for rural, city roads and highways


Pavement technology for rural, city roads and highways
In our country the mindset of the people, even the scientific community needs to be changed.
In earlier days because of economically cheaper to concrete ,easy to built bituminous roads were popular in our country. But we now realise that though it is cheaper to make bituminous roads it is very costly to maintain them. The escalating cost of bitumen the bituminous road cost is increasing every year. It is observed that because of development of the admixtures it became possible to make concrete road which can open to traffic in three days. We have developed concrete technology for rural. city roads and highways

1)Rural roads
Thane unit of PMGSY (PRIME MINISTER GRAM SADAK YOGNA)   laid in Murbad, Thane District first concrete road to connect  Bhangarwadi 7KM away from main Bombay- Malcej highway
The technical details are as follows. The concrete is made using conventional equipments like 10/7 concrete mixer ,screed vibrator ,channel ,cutting machine etc.
The mix design is given below.
                             KG
Cement
250-300
Flyash
150-200
Crush sand
850
Metal  1
450
Metal 2
550
Admixture
3
water
140
The concrete cost is RS 4000/M3) The 150mm thick above concrete is laid over 150mm well  compacted GSB layer. The last three years though the vehicular traffic is only bicycle,  bikes. cars and bullock cards it is in good condition
The rural roads today the bituminous wearing course is  worn out and the surface every were is of metalled one.It can be immediately surfaced by concrete roads.
2 City roads
Thane city is the excellent example of  UTWT overlay.100-150mm thick  concrete overlay over damaged bituminous roads .The city has laid 25km of roads in city

Thane municipal corporation has laid 25km of roads  in city .They have ambitious plan of further 50km of UTWT  roads in next two three yes

The mix design  is given below
                                      KG
Cement
380-400
Flyash
150
Crush sand
850
Metal1
450
Metal2
550
Admixture
4
Water
130-140


                                 
Economic
The cost of installing TWT overlay is compared with the Polymer modified bitumen mix( PMB) or crumb rubber bitumen (CRMB) mixes considering the five year bituminous mixes renewal period.


UTWT
PMB / CRMB
Concrete
Rate, Rs. Per square meter
2200
1575
6000
Yearly repair cost
nil
100
0

Nil
100
0

Nil
100
0

Nil
100
0
Renewal layer
nil
1575
0
Total after five years
2200
3550
6000




3)High ways

Reinforced UTWT of 200mm thickness is used. The reinforcement is of steel mesh of 6mm diameter  fixed at the bottom of the road.
                      
The mix design is given below
                             KG
cement
400-420
flyash
150
Crush stone
850
Metal1
450
Metal 2
550
admixture
4
water
130


The crore  of rupees spent on maintenance of the bituminous roads can be saved by concrete roads.

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