Now ADD EVERYTHING EVER DONE:

This part deals with how to determine the “recoverability” of a building and its components. Lots of different names in literature, circularity index, recoverability factor. These are important in formulating a benchmark to compare against. Some are enumerated here but there’s lots more:

Akanbi Recoverability:

\(RF = f \times (1-e^{t-\alpha} - \dfrac{t}{10 \alpha})\)
First part of the service life \(\alpha\) linearly degrades then as it approaches end of service life, exponentially degrades.

Arora Cost based Feasibility:

Simple, if the cost of deconstruction is much lower than the cost of buying the component anew and its value as scrap, then worth if to salvage carefully: \(C_{UM} \ll C_{new} \& C_{UM} < V_{scrap}\)
\(C_{savings} = C_{UM} - V_{scrap} - C_{new}\)

O’Grady Circularity Index:

Disassembly index is defined as:
\(DI = \dfrac{1}{w_{bldg}}\sum_{i=1}^{N} DI_{tool} \times DI_{move} \times w_{component}\)
The demolition index is defined as:
\(DE = \dfrac{1}{w_{bldg}}\sum_{j=1}^{M} DE_{tool} \times DE_{move} \times w_{component}\)
The resilience index or how many times the component can be reused or its service life
\(R = \dfrac{1}{w_{bldg}}\sum_{k=1}^{P} R \times w_{component}\)
The values \(DI_{tool},DI_{move},DE_{tool},DE_{move},R\) are constants defined on a Likert scale between 0.2 and 1, which is an abstract measure of circularity.