Civil Engineering Reference
In-Depth Information
14
Concrete with construction and demolition
wastes (CDW)
A. E. B. CABrAl, Federal University of Ceará, Brazil
DOI
: 10.1533/9780857098993.3.340
Abstract
:
This chapter discusses the recycling of construction and
demolition wastes (CDW) and the use of recycled aggregates in concrete.
Classification and characteristics of recycled aggregates, physical and
mechanical properties, and durability of recycled aggregate concrete are also
discussed.
Key words
:
construction and
demolition waste (CDW), recycled aggregate,
recycled aggregate concrete, mechanical and durability properties.
14.1 Introduction: use of construction and
demolition wastes (CDW) in concrete
As in any industrial process, the construction industry generates waste on
a large scale, which needs to be managed. According to John (2001), the
macro complex of the construction industry accounts for 40% of waste
generated in the economy.
Given the important role of the construction industry in developing
nations, it is advisable to seek and adopt urgent measures in order to achieve
sustainable development. For Terry (2004), legislation is the biggest factor
affecting waste management in the construction industry. Without effective
legislation and strong enforcement, as well as an effective collection system,
it will not be possible to resolve the complex waste management issue. This
can be defined as construction waste
from the buildings, renovations, repairs and demolition of civil works, as
well as the resulting preparation and excavation of land, such as bricks,
ceramic blocks, concrete in general, soils, rocks, metals, resins, glues,
paints, wood, plywood, liners, mortar, plaster, tiles, asphalt pavement,
glass, plastics, pipes, electrical wiring, among others, which are commonly
called debris works, glass or shrapnel (MMA, 2007).
It is estimated that most of the waste is from construction and demolition
work, as well as construction sites or construction services, known as
construction and demolition waste (CDW).
There is a great tendency to sort out CDW as inert waste, due to the large
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