ABSTRACT
Many
industrial by-products (e.g., fly ash, silica fume, and granulated
blast-furnace slag) have been standardized as supplementary cementing materials
(SCMs). Partial replacement of cement by SCMs could reduce cement production
and therefore reduce fossil-fuel consumption and greenhouse-gas emissions.
These traditional SCMs are not always available in all regions and would be
costly to transport. Developing local alternative SCMs (ASCMs) is of paramount
importance. Mixed-coloured glass cannot be recycled and is normally disposed of
in landfills, causing obvious environmental problems. So, valorisation of this
glass after grinding to same fineness as cement allows its use as ASCM,
especially it has pozzolanic behaviour. The study reported on herein
demonstrates the in situ performance of concrete containing glass powder (GP)
used as a partial replacement of cement at various construction sites (in
Quebec-Canada between 2006 and 2012), including interior and exterior slabs and
structural wall elements. In addition to the environmental benefits, the
concrete made with 20% GP replacement showed increases in 91-day compressive
strength (7%), 28-day tensile strength (35%), and 28-day flexural strength (4%)
compared to reference mixtures without GP. A significant increase in resistance
to chloride ion penetration (284%, i.e., 987 vs. 2800 Coulombs) can be obtained
when using GP concrete.
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