38974327 Construction Waste Recycling 1

8/7/2019 38974327 Construction Waste Recycling 1

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CONSTRUCTION

WASTE RECYCLING

Nitin Sakla 80

Sahil Shah 90

Arvind Sonawane 100

Pratik Vartak 115


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INTRODUCTION

The promotion of enviornmentalmanagement and the mission of sustainabledevelopment have exerted the pressure

demanding for the adoption of propermethods to protect the enviornment acrossall industries including construction.

Construction by nature is not an eco-friendlyactivity.

Construction,renovation and demolitionactivities leads to the formation of waste.


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NEED FOR ADOPTION OF PROPER

METHODS OF RECYCLING

a) It reduces the demand up on new resources.

b) Cuts down the cost and effort of transport

and production.c) Use waste which would otherwise be lost to

landfill sites.


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CONSTRUCTION WASTE PROBLEM

WASTE- Material by-product of human and

industrial activity that has no residual value.

Need for Comprehensive construction wastemanagement in every site.

Every personnel,from the management to the

operational level should work for the goal of

construction waste management.


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AGGREGATE FROM CONSTRUCTION AND

DEMOLITION WASTE

Recycled precast elements and cubes after

testing (the aggregate could be relatively

clean with only cement paste adhering to it). Demolished concrete building(aggregate

could be contaminated with bricks and tiles,

sand and dust, timber, plastics, cardboard

and paper and metals.)

Used as a subtitle for natural coarse

aggregates in concrete


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FACTORS THAT ASSESS THE QUALITY

OF RECYCLED AGGREGATE

Size distribution

It has been generally accepted that recycled aggregates either fine or coarsecan be obtained by primary and secondary crushing and subsequent removal ofimpurities.

The best particle distribution can be achieved by primary crushing and then

secondary crushing, but a single crushing process is more effective from theeconomic point of view.

Absorption

The water absorption in Recycled Aggregates ranges from ( 3-12% ), this valueis much higher than that of natural aggregates whose absorption is about ( 0.5-1 % ).

Abrasion resistance

Use of such aggregates as sub base in flexible pavements show promisingresults. These recycled aggregates have also been used in generating concretethat is further used in rigid pavements .


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PROPERTIES OF FRESH RECYCLED

AGGREGATE CONCRETE

The air content of recycled aggregate concrete is

slightly higher ( 4-5 % ) than concrete with natural

aggregate. This increased air content in the recycled

concrete leads to reduction in the density of freshconcrete.

The bulk density of fresh concrete made with natural

aggregates is in the range of 2400 kg/m3, where as theconcrete made with recycled aggregates is significantly

lighter, 2150 kg/m3.


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VIABLE TECHNOLOGY ON

CONSTRUCTION WASTE RECYCLING

When considering a recyclable material, three

major areas need to be taken in to account

are: Economy

Compatibility with other materials

Material properties


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DIFFERENT WASTES IN A

CONSTRUCTION SITE

Brick

Bricks arising from demolition may be contaminatedwith more mortar, plaster and are often mixed withother materials such as timber and concrete.Inrecent years, bricks are commonly crushed to formfilling materials.

Concrete

The most usual way to recycle concrete rubble is

categorized as:a) Bound ( natural aggregate replacement in newconcrete )

b) Un bound ( road base, trench etc )


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Ferrous Metal

It is by far the most profitable and recyclable

material.In India more than 80% scrap arising is

recycled. Scrap steel is almost totally

recycled and allowed repeated recycling.

100% steel can be recycled to avoid wastageat construction site.


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Masonry

Masonry is normally crushed as recycledmasonry aggregate.

A special application of recycled masonryaggregate is to use it as thermal insulatingconcrete.

Another potential application for recycledmasonry aggregate is to use it as aggregatein traditional clay bricks.


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Non Ferrous Metal

The main non ferrous metal collected from

construction and demolition sites arealluminium, copper, lead and zinc .

In India alluminium usage is up to 95000

tonnes with about 70% recycled in 2004.

Copper is recycled up to 119000 tonnes outof a national market of 262000 tonnes.


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Paper And Cardboard

Paper and paper board comprise

approximately 37% construction anddemolition wastes by volume.It usually

attracts recyclers to reprocess them as new

paper product by purification.


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Plastic

The plastic wastes are best possible for recycling ifthese materials are collected separately andcleaned. Recycling is difficult if plastic wastes aremixed with other plastics or contaminants.

Plastic may be recycled and used in productsspecifically designed for the utilization of recycledplastic, such as street furniture, roof and floor, PVCwindow noise barrier, cable ducting, panel.

Japan practices adopted burning of waste plastic athigh temperature and turning them in to ultra fineparticles, known as man made soil.


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Timber

Timber waste from construction and

demolition works is produced in large quantityall over the world.

Whole timber arising from construction and

demolition works can be utilized easily and

directly for reused in other constructionprojects after cleaning, denailing and sizing.


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BARRIERS IN PROMOTING USE

OF RECYCLED MATERIALS Lack of appropriately located recycling

facilities.

Absence of appropriate technology. Lack of awareness


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CONCLUSION

In order to reduce the construction waste, during the time ofconstruction order only the correct amount of raw materials.Proper care should be taken to ensure the protection of materials

being delivered and stored in the site. When a structure is beingdemolished, salvage as much of the more valuable fittings andmaterials as possible. Any suitable substitute for aggregateshould be considered during the construction. It is the duty of anengineer to revaluvate technical specification for materials wherestrength and safety do not have to be compromised to permit the

use of recycled materials. As sorting and recycling facilitiesbecome more wide spread and better developed it will be easierto redirect our waste from landfill.


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REFERENCES

L.Y.Shen, D Drew, and C.M. Tam, (2004), ConstructionWaste recycling,Journal of Construction Engineering and

Management,4,Vol 130,pp 472-481.

J

essica Krippendor,(2008), Construction Wasterecycling,Journal of Canadian wall and ceiling,pp14-18.

Darin Steen,(2008),Bios Force builds low cost C&DLandfill,Journal of Tribal Waste,pp 8-10.


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38974327 Construction Waste Recycling 1

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