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Report submitted by-

Er.Banajit Adhikary , BE(Civil),AMIE,PMGSY Nodal Officer

Er. Nirmaly Roy Medhi , BTech(Civil),Graduate Engineer

Er. Parishmita Talukdar , BE(Civil),Graduate Engineer

Er. Tarali Saikia , BTech(Civil),Graduate Engineer

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ACKNOWLEDGEMENT

We feel privileged in extending our earnest obligation, deep sense of gratitude,

appreciation and honour to Nip Kumar Sarma, Superintending Engineer,

PWD(Roads),WAC,Goalpara and A.Y.M Shahidul Islam, Executive Engineer,PWD Rural

Roads Division,Goalpara whose benevolent guidance, constant supervision, suggestion and

constructive criticism has inspired us in successful completion of making this report. We also

express our sincere gratitude for providing us the opportunity which brought us to light

regarding many new field of technologies used in road construction.

Er. Banajit Adhikary ,Btech(Civil),AMIE,PMGSY Nodal Officer

Er.Nirmaly Roy Medhi, BTech(Civil),Graduate Engineer

Er.Parishmita Talukdar, BE(Civil),Graduate Engineer

Er.Tarali Saikia,Btech(Civil),Graduate Engineer

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1) Cell filled concrete pavement

A short overview :

It can be called as cast-in-situ concrete block pavement. The method of construction makes the

concrete flexible, and the surface does not crack. It is labour based, maintenance free and ideally

suited to rural road construction as per the policy of the government where employment generation is

very important for the empowerment of the poor. The technology can also be used for overlays over

damaged black top roads, pavements of footpath, roads of housing complex, container yards, haul

roads for transport of mineral products, parking area of heavy vehicles etc. The expected life can be

about 15-20 years. The minimum strength of concrete pavement is 30MPa.

Fig: A typical cross section cell filled concrete pavement

The process:

The following steps were followed-

The plot is prepared for the construction.

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Rolling is done to make the GSB (100 mm) surface levelled.

The GSB is made saturated by spraying water to prevent water absorption from concrete.

Brooming is done to remove any dirt lying over it.

Lateral confinement is done with wooden planks. It is preferable to use brick (4 inch depth of

brick should be above the ground surface) for confinement to prevent spalling under heavy

traffic.

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Cells are made of recycled High Density Polythylene (HDPE) of size 6 inch X 6 inch X 4inch

and are connected by stiching. Iron spikes are driven at an interval of 8.5 inch for proper

alignment of the cells.

Each strips of cells can be laid upto a distance of 10m. Thus, they can be cast as a single panel

of length 10m every time.

Jute/Nylon ropes are tied at an interval of about 1m along the width to prevent collapsing of

the cells during pouring of concrete.

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Concrete is prepared at site with the help of concrete mixer.

After that, concrete is poured over the cells manually upto a depth of 100mm (4 inch).

Concrete is compacted with the help of a plate vibrator.

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The concrete surface is levelled.

Before allowing heavy traffic to pass over the concrete pavement, proper curing is done using

wet rice straw.

Benefits of cell filled concrete pavement:

1. Long lasting pavement .

2. Labour intensive which results in more employment generation.

3. Useful for areas where forest materials and stone quarries are limited.

4. Base course is not necessary. Concrete layer can be laid directly over Sub-base which makes

it cost effective.

5. Maintenance cost is less as compared to bituminous pavement.

6. There will be no problem of pot holes.

7. No re-surfacing is required

Following images at our site:

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Fig: Cell filled concrete pavement work in progress at Panisali to Jhanjipara via Galsira

(Package No: AS-07-298) under PMGSY scheme.

Fig: Cell filled concrete pavement work in progress at Thorko Panisali

(Package No: AS-07-325) under PMGSY scheme.

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Fig: Superintending Engineer of PWD Roads,WAC, Goalpara Mr.Nip Kumar Sarma , Assistant

Engineer cum Nodal Officer PMGSY of Goalpara Rural Road Division Mr. Banajit Adhikary and

Graduate Engineers of Goalpara RR Division Tarali Saikia, Nirmaly Roy Medhi, Parishmita

Talukdar visit to the site at Thorko Panisali Road.

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2) Paneled Concrete Pavement

A short overview:

It is another type of long lasting pavement for rural roads. In India, like rest of the world, most of the

highways and pavements are bituminous but concrete roads of international standard have also been

constructed and are being constructed. Bituminous roads in rainy regions like Assam have high

chances of damage in monsoon due to poor drainage. Cement concrete pavements became the obvious

choice in such locations.

Short paneled concrete pavements develop much lower wheel load stresses and require lower

thickness and its durability is much higher than bituminous pavement.

Fig: Cross-Section of Paneled Concrete pavement

The proposal for Panelled concrete has been submitted for Goalpara District and the

work will soon be started.

The process:

The following steps are to be followed:

The plot has to be prepared first for the construction.

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Rolling is to be done to make the GSB (150 mm) surface levelled.

Lateral confinement is to be done with wooden planks.

Pavement Quality Concrete(PQC) is to be prepared in concrete mixer and has to be poured

over the GSB layer up to a thickness of 100mm (Concrete of grade M25 is to be used).

Mixing and spreading operations are to be performed.

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Texturing is to be done using broom

After 24 hours (not less than 12 hours) , saw cutting/grooving is to be done on the PQC upto

1/3rd depth(around 25 to 30mm) using diamond cutters fitted in hand hold machines .

Soon after grooving is done on PQC in appropriate panel size, curing is to be started and

maintained for 28 days.

Benefits of paneled concrete pavement

1. If the durability in term of economy is seen, short-paneled concrete pavement is much

economical.

2. Maintenance cost is low compared to conventional bituminous pavement.

3. Durability of this pavement is expected to be not less than 20 years.

4. Short panelled concrete pavements develop much lower wheel load stresses and require

lower thickness.

5. There will be no problem of pot holes.

6. No re-surfacing required.

7. The saw cutting/grooving increases the load carrying capacity of the pavement (suitable

for heavy traffic ) and moreover the cracks that would form after the grooving would

develop natural interlocking in concrete mix.

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3)Precast interlocking concrete block pavement

A short overview:

Interlocking Concrete Block Pavement (ICBP) has been extensively used in a number of countries for

quite sometime as a specialized problem-solving technique for providing pavement in areas where

conventional types of construction are less durable due to many operational and environmental

constraints. ICBP technology has been introduced in India in construction, a decade ago, for specific

requirement viz. footpaths, parking areas etc. but now being adopted extensively in different uses

where the conventional construction of pavement using hot bituminous mix or cement concrete

technology is not feasible or desirable.

Fig: A typical cross section of ICBP

Fig: Load transfer mechanism of ICBP

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Important points that are highlighted -

Edge restrained is necessary on both sides.

The concrete blocks must be arranged in a mesh formation as shown in the figure.

The concrete blocks should preferably be rectangular in shape having side projection not less

than 3mm. The side projection should be placed in staggered position on the opposite side of

the block to ease out laying operations.

There must be a gap of 2 to 4mm between the concrete blocks.

The jointing sand must pass through 2mm sieve. The sand must be saturated (either

completely dry or completely wet). It must be densely packed between the concrete blocks so

that the concrete blocks behave as a single unit.

After placing of concrete blocks, Bitumen Emulsion must be sprayed in between the joints.

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Process:-

The following steps is followed:-

The plot is prepared for the construction.

Rolling is done to make the GSB ( 125 mm or 5 inch) surface levelled

Bedding sand is laid upto a depth of 30-40mm over the rolled GSB layer.

Precast Concrete blocks are then placed.

Fig: Precast Concrete Block Pavement work in progress at Lakhipur Jaleswar Road under

RIDF-XXI.

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Before construction After construction

Name of work: Construction of road from Joypur Bazar to Sonahara ( Ch 0.00km to Ch 2.039km)

under Fakaruddin Ali Ahmed Paki Path Nirman Achoni .

Benefits of using Precast Concrete block pavement:

1. Easy installation.

2. Maintenance free

3. No cracking

4. Four times stronger than poured concrete.

5. Pavers are a flexible system and allow for movement

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