BUNBURY OUTER RING ROAD
ROUTE — RECYCLED MATERIALS
425. Hon DIANE EVERS to the minister representing the
Minister for Transport:
I refer to the Roads to Reuse pilot
program case study in November 2019 that found that there are a number of
benefits of using recycled materials in the construction of roads.
(1) Does the proposed Bunbury Outer
Ring Road construction include the use of recycled materials; and —
(a) if yes, how much and what
percentage of road base is to be from recycled materials; and,
(b) if not, why not?
(2) Given the
findings of the study, what existing projects are using or will use recycled
materials, and what is the total percentage of the project base?
(3) How many
mining proposal applications to extract limestone for the Bunbury Outer Ring
Road have been made, and —
(a) how much and in which areas;
(b) have any been approved; and,
(c) has the impact on surrounding groundwater,
threatened ecological communities, tuart and banksia woodlands and
threatened species been considered in these applications?
Hon
STEPHEN DAWSON replied:
I thank the honourable member for
some notice of the question.
(1) Yes.
(a) Crushed recycled concrete is planned to be used
for all sub-base under full-depth asphalt pavement at intersections, reconstituted structural blocks
will be manufactured for retaining walls, chromed scrap rubber is planned to be blended with bitumen
for sealing in at least 30 per cent of the project, and crushed glass is intended to be used in
earthworks, with research and development underway;
(b) not applicable.
(2) Main Roads is
encouraging all current contracts to use crushed recycled concrete as the
sub-base under all full-depth asphalt pavements.
(3) Main Roads is
unaware of any limestone extraction mining proposals for the Bunbury Outer Ring
Road at present.