Crushed recycled
glass can be used as a complete fine aggregate replacement in
concrete, whilst finely ground glass
(powder) has pozzolanic properties and can be used as a Type II
(pozzolanic) addition. Compared with Portland cement concrete
at equal water/cement ratio, use of recycled glass as a Type II
addition will lead to:
•lower heat of hydration
and use of recycled glass as fine aggregate will give:
•improved fresh properties
•better resistance to abrasion
•enhanced resistance against freeze/thaw attack.
1.85 million tonnes of glass cullet,
derived from waste glass, are collected in the UK each year. The
most effective method of reuse is to return it for new glass production.
However, there is currently a surplus of cullet that needs to
find alternative markets. Use of recycled glass as an aggregate
or addition in concrete will contribute towards sustainable development
by:
•encouraging recovery of container glass
•reducing overall greenhouse gas emissions
•reducing natural aggregate usage.
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