Hi Friends,

Even as I launch this today ( my 80th Birthday ), I realize that there is yet so much to say and do. There is just no time to look back, no time to wonder,"Will anyone read these pages?"

With regards,
Hemen Parekh
27 June 2013

Now as I approach my 90th birthday ( 27 June 2023 ) , I invite you to visit my Digital Avatar ( www.hemenparekh.ai ) – and continue chatting with me , even when I am no more here physically

Thursday 4 August 2016

USE OF COLD ASPHALT FOR FILLING POT HOLES


Mr Sanjay Mukherjee / Mr Sanjay Deshmukh / Ms Pallavi Darade

Bombay Municipal Corporation


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Dear Sirs / Madam :

Over the past 2 months , there have been lots of reports in news papers re the unsolved problem of effective filling up of pot holes on roads of Mumbai

A report appearing in Times of India ( 02 Aug ) tells about Municipal Corporation trying out some pot hole filling material imported from Austria

My following blog / suggestion is based on my interactions / negotiations with a French Company COLAS , way back in 1987-88 , for a Technical Collaboration with L&T , ( where I was , at that time , General Manager - Planning & Development )

After lapse of 28 years , I have no idea if COLAS still continue to supply Plants ( very simple that can be manufactured by a decent workshop in Mumbai ) and the process knowhow  showing how to mix 90 % water with 9 % asphalt in presence of a catalyst

But you may want to send out an inquiry to COLAS , to whom , I am marking a copy of this mail

May be , they will contact you on their own !

If I can help in any way , do not hesitate to phone or write

Incidentally , I retired from L&T , 26 years ago and have no connection whatsoever , with COLAS

with regards,

( click to view my profile ) 
Marol , Mumbai , India
( M ) +91 - 98,67,55,08,08
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Cold  Asphalt   is  THE   ANSWER

Hindustan Times ( 19 July ) carries a news report titled :

BMC to test new materials to fix potholes "

Report goes on to say :

" The BMC has identified five private companies , each of which will need to fill 50 sq meters of potholes on various roads. They will be using their own technology on trial basis .


Sources said the five firms had given presentations in which a ready mix of  POWDERED BITUMEN stored at normal ROOM TEMPERATURE  in 25 kg bags, could be  DIRECTLY POURED  onto the potholes. Using this mix, potholes can be LEVELED QUICKLY and roads THROWN  OPEN TO TRAFFIC IN 20 MINUTES.... according to these companies , their materials will work on a WET SURFACE TOO   "


I am glad that someone in BMC managed to hack into my mail-box and downloaded my following email to Shri Nitin Gadakari-ji :

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Sunday, 21 February 2016


Keep Experimenting !


Shri Nitin Gadkari likes to experiment and take the accompanying risks


He is not afraid to stick out his neck for fear of it getting chopped off 


He is not paralyzed into inaction by  " fear of failure "


He like to tell his officers , " Forget the  history - what is your problem ? "


Then offers solutions such as :

*  Logistic parks around big cities to decongest roads and reduce pollution

*  RFID sensor embedded vehicles , paying toll amount electronically without stopping / needing humans

*  E-rickshaws to be treated on par with petrol driven rickshaws

*  By passing Bharat V emission standards to directly jump to Bharat VI standards for all vehicles

*  Introducing hybrid model of financing for attracting private participation in Highway construction

*  Use of slag cement in construction of highways ( use of waste by-products of Steel Industry )


Dear Shri Gadkariji  :


Allow me to suggest use of " COLD  ASPHALT " technology for building new roads / filling pot holes


Use of hot asphalt requires a very narrow temperature range within which it must be spread on roads before rolling


Any hotter and it will just stick to the roller . Any colder and it just won't set


It is difficult to maintain such narrow range ( of temperature ) after asphalt carrying truck travels hundreds of kilometers - even when that truck has a heating jacket ( consuming lots of fuel ! )


If solidified asphalt ( usually stored in steel drums ) is used at the construction site , then it needs to be heated / melted locally ( usually by creating a wood fire ) - causing pollution and consuming trees !


And hot asphalt would just not adhere to a wet surface , rendering it useless for use in monsoon - especially for repair of pot holes


"  COLD  ASPHALT  " technology overcomes ALL of these problems  !


*  It consists of mixing water ( 90 % ) with hot asphalt ( 9 % ) in presence of a specialty chemical ( 1 % ) , in a
    very simple Mixing Machine which can be transported anywhere on a trolley

*  This liquid mixture can remain stored in steel drums at ROOM  TEMPERATURE for over ONE YEAR !


Drums containing liquid can be transported and stored at road construction sites and COLD  ASPHALT mixed
    with sand / aggregates as and when required . No ripping / destroying of drums and breaking of solid asphalt


There is no need for ANY temperature control as mixture / aggregate can remain at  AMBIENT  temperature


Since Cold Asphalt is basically water ( 90 % ) , it is ideally suited for filling wet pot holes or laying on wet roads


After laying / spreading , as soon as a heavy roller is driven over Cold Asphalt mixed aggregate , chemical bond
   between water and asphalt is broken due to heavy pressure and  setting process starts , causing the layer to
   solidify . 

Within a matter of MINUTES , regular traffic can flow over the road  ! or over the filled pot holes  !


*  Use of Cold Asphalt technology results in a HUGE COST SAVING  ( remember , it is 90 % water ! )


*  Cold Asphalt roads are much easier to repair , with no pollution , and very little energy consumption


*  Using Cold Asphalt technology, 3 machines ( leveler / spreader / roller ) can lay
1 KM road in a day  !



I have personally seen NATIONAL HIGHWAYS being constructed with Cold Asphalt technology in France , way back in 1988  !


You may turn around and ask :

"  With these advantages , how come our PWD / Municipalities have not adopted this revolutionary technology ? "


My guess :

Because those responsible for drawing up tender documents , insist on use of Hot Asphalt !


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20  July  2016


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A page from www.Colas.com


Production of construction materials

Production of construction materials (15% of total Group revenue)

Upstream from the construction and maintenance activity, Colas also does significant business in the production and recycling of construction materials (aggregates, emulsions and binders, asphalt mix, ready-mix concrete and bitumen) across all its sites around the world. Some of these materials are used by the Group while others are sold to third parties.

Colas operates via a dense international network consisting of:


More than 700 quarries and gravel pits
130 emulsion and binder plants
More than 550 asphalt plants
Nearly 200 ready-mix concrete plants
1 bitumen production plant in Malaysia

Total volumes produced by Colas in 2015 were as follows:

95 million tons of aggregates
1.8 million tons of emulsions and binders
39 million tons of asphalt mix
2 million cubic meters of ready-mix concrete
1 million tons of bitumen
The Group’s global authorized reserves of aggregates are estimated at 2.6 billion tons.


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hemen  parekh
( click to view my profile ) 
Marol , Mumbai , India
( M ) +91 - 98,67,55,08,08


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