Phd Thesis In Construction Waste Management

A triage process is proposed to capture timely information about existing building components to be discarded, make this information visible to a wide community, and determine usefulness by focusing creativity already present in the industry on an exhaustive examination of component reusability and upcyclability.

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This article therefore reviews areas of waste interventions that seek to address these impacts.

It then aims to explain the systemic mechanisms that currently lead to end-of-use building components being discarded as waste, and, in response, describe a series of interlinked activities to support (a) the identification and separation of reusable components, and (b) an incremental increase in the capacity for component management.

The recycled wood chip has a lower economic value than the joist from which it came.

It also has reduced ‘utility’, considered as a function of the displaced impacts of extracting and processing a primary material, and the performance of that material’s duty through a period of time.

The global image of recycling—the familiar triangle of arrows—conjures an idea of continuous cycles, yet open-loop recycling is better described as delayed disposal [11].

When, for instance, timber joists are chipped for chipboard, this open-loop recycling still requires trees to be felled, milled, and produced when we want new joists.

Recycled aggregate from concrete displaces primary aggregate—a material with low value and impacts compared with concrete.

The lower duty performed as aggregate represents a loss of between 70 and 185 kg embodied CO/tonne of concrete [12].

Even recycling of metals entails a loss of utility.

Properties of products from refining steel scrap, for instance, do not match those of steel obtained from virgin production, so secondary steel is used for reinforcing bar and sections, but not for higher grade and applications like plate and sheet, which have greater impacts [13]. [14] report that, in the Netherlands, only 3–4% of material used in the construction of buildings is from a secondary source, despite 95% of C&D waste being recycled.

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