INVESTIGATING FOR POZZOLANIC ACTIVITY IN THE BLEND OF GROUND GLASS WASTE WITH CEMENT FOR SUSTAINABLE CONCRETE
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This research work investigates the tensile and flexural strengths of concrete
containing ground glass as a partial replacement for cement. Sustainability is to be
attained by the reduced volume and cost of disposing the glass wastes that would have
been meant for landfills, reduce the cost of glass-cements blend because the glass are
unwanted wastes that needs lesser heat to process as a pozzolan for use in concrete,
and reduce greenhouse gas emissions due to the reduced use of cement needed per unit
concrete due to the replacement.
The ground glass was obtained from waste louver blades, pulverized and sieved with
a 100μm sieve size. The physical properties such as moisture content, bulk density and
specific gravity of the ground glass (GG) were determined. Sixty (60) cylinders of
150mm diameter and 300mm high were cast, three (3) samples for each of the
percentage replacement groups of 0%, 10%, 20%, 30% and 40% corresponding to the
curing ages of 3, 7, 28 and 56 days for each test. Thirty-six (36) beams of
100x100x500mm were also cast for flexural strength test, three (3) samples for each of
the percentage replacement groups of 0%, 20% and 40% corresponding to the curing
ages of 3, 7, 28 and 56 days. The specific gravity of the GG was found to be 3.67 and
the bulk density was 1275kg/m3. The results of the findings show that as the partial
replacement of cement with ground glass increases from 10% to 40%, the tensile
strength of specimens for all curing periods of 3 to 56 days decreases. The flexural
strength tests show a similar pattern of reducing flexural strength for all the curing ages
as percentage replacement increases. However, it was observed that concrete with 10%
replacement of cement with ground glass at 100μm fineness level had slight improved
tensile strength of the concrete than the control (0% replacement with the GG) for the
later curing period indicating the pozzolanic activity of ground glass.
Keywords
Q Science (General)