This document discusses construction waste recycling. It notes that construction generates a significant amount of waste and that recycling can reduce environmental impacts. It identifies several materials commonly recovered from construction sites, such as asphalt, wood, gypsum wallboard, metals, concrete, brick, and roofing. Recycling these materials provides benefits like reducing pollution, conserving landfill space and resources, and creating jobs. However, barriers to recycling include a lack of facilities, technologies, awareness, and proper waste separation at job sites. The document advocates developing markets for recycled products, education and training, and policies to promote greater recycling in the construction industry.
Concrete is a major waste in construction Industry. It needs to be recycled to make a waste free environment. So how concrete is recycled, which type of concrete can be recycled, where it can be used is mentioned in this ppt.
Concrete is a major waste in construction Industry. It needs to be recycled to make a waste free environment. So how concrete is recycled, which type of concrete can be recycled, where it can be used is mentioned in this ppt.
Construction and demolition waste recyclingAnand Vallala
Now a days as the construction is increasing the demolition waste from the buildings is also increasing. We have to increase the usage of waste materials and to help for the future generation.
Construction activities generate millions of tonnes of Construction and Demolition (C&D) waste materials each year. These materials contain a lot of reusable materials. If not properly managed, they will become wastes, a burden to the society, which will be extremely expensive to handle and will occupy precious landfill space.
Now even for small projects it has been made mandatory to use Ready mix concrete or compulsory use of Batching plant. However, except for large projects and some industrial projects, Demolition of structures is not yet mechanised. This waste is also affects the air, noise pollution in the form of releasing dust and noise respectively.
Recycling can turn the waste materials into usable products, which can help conserve our natural resources for our next generations and for the sustainable development of the society. In the recent years, C&D waste management issues have attracted the attention from researches around the world.
The ultimate aim is to create the awareness among the Civil Engineers is to do the research on this topic and to reuse these materials.
Main points of this PPT:
• An overview of the concept on Waste management.
• Brief description on “Recycled Concrete Aggregates”.
• Waste reduction and Reuse.
• Demolition techniques.
• Use of proper Waste Management plan.
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The largest-volume of recycled material used as construction aggregate is blast furnace and steel furnace slag. Blast furnace slag is either air-cooled (slow cooling in the open) or granulated (formed by quenching molten slag in water to form sand-sized glass-like particles). If the granulated blast furnace slag accesses free lime during hydration, it develops strong hydraulic cementitious properties and can partly substitute for portland cement in concrete. Steel furnace slag is also air-cooled. In 2006, according to the USGS, air-cooled blast furnace slag sold or used in the U.S. was 7.3 million tonnes valued at $49 million, granulated blast furnace slag sold or used in the U.S. was 4.2 million tonnes valued at $318 million, and steel furnace slag sold or used in the U.S. was 8.7 million tonnes valued at $40 million. Air-cooled blast furnace slag sales in 2006 were for use in road bases and surfaces (41%), asphaltic concrete (13%), ready-mixed concrete (16%), and the balance for other uses. Granulated blast furnace slag sales in 2006 were for use in cementitious materials (94%), and the balance for other uses. Steel furnace slag sales in 2006 were for use in road bases and surfaces (51%), asphaltic concrete (12%), for fill (18%), and the balance for other uses
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2. INTRODUCTION
• Construction waste recycling is the separation
and recycling of recoverable waste materials
generated during construction and
remodeling.
• Construction by nature is not an eco-friendly
activity.
3. 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.
4. FACTORS THAT ASSESS THE QUALITY
OF RECYCLED AGGREGATE
• Size distribution:- that recycled aggregates
either fine or coarse can be obtained by
crushing.
• Absorption :- high in recycled aggregates than
in natural aggrigates
• Abrasion resistance :- Use of such aggregates
as sub base in flexible pavements show
promising results
5. PROPERTIES OF FRESH RECYCLED
AGGREGATE CONCRETE
• The air content of recycled aggregate
concrete is slightly higher ( 4-5 % ) than
concrete with natural aggregate.
• Bulk density of recycled concrete is less than
fresh concrete,
6. 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
10. Wood
Reuse timbers, large dimension lumber, plywood, flooring, molding, lumber
longer than 6 feet. Clean, untreated wood can be recycled, re-milled into
flooring, or chipped/ground to make engineered board, boiler fuel.
11. Gypsum Wallboard
Remove and recycle gypsum drywall. Markets
include new drywall manufacture, cement
manufacture, and agriculture. Unused drywall can
be returned to a supplier, donated, or sold.
12. Buildings
Reuse large portions of existing structures during renovation or
redevelopment. Extending the life cycle of existing building stock will
conserve resources, retain cultural resources, reduce waste, and
reduce environmental impacts of new buildings.
13. Metals
Common metals include steel, aluminum, and copper. Metals are
melted down and reformed into metal products.
14. Concrete
It is crushed, the
reinforcement bar is
removed, and the
material is screened
for size. Market
outlets for recycled
concrete include road
base, general
fill, pavement
aggregate, and
drainage media.
15. Brick
Recycle clean brick by crushing material. Market outlets
for recycled brick include aggregate, drainage media,
and general fill.
17. BENEFITS
• Reduces the production of greenhouse
gas emissions and other pollutants by
reducing the need to extract raw
materials and ship new materials long
distances.
• Conserves landfill space, reduces the
need for new landfills and their
associated cost.
18. • Saves energy and reduces the
environmental impact of producing new
materials.
• Creates employment opportunities and
economic activities in recycling
industries.
• Saves money
19. BARRIERS IN PROMOTING USE OF
RECYCLED MATERIALS
• Lack of appropriately located recycling
facilities.
• Absence of appropriate technology.
• Lack of awareness .
• Poor source separation practices at job
sites
20. How to get start for it……
• Developing market for recycled products
• Public Education, Training and Technical
Assistance
• Additional Policy Recommendations
• Promoting recycling
21. CONCLUSION
• In order to reduce the construction
waste, during the time of construction
order only the correct amount of raw
materials.
• As sorting and recycling facilities become
more wide spread and better developed
it will be easier to redirect our waste
from landfill.