| dc.description.abstract | Concrete structures exposed to aggressive environment such as sewer water, sea fronts,
drains among others are susceptible to abrasion, chemical seepage among other factors
that lead to its deterioration. To mitigate deterioration of concrete, various methods have
been proposed such as use of supplementary cementitious materials, regular replacement
of worn-out sections among other considerations. This research recommends use of glass
powder as an additive to concrete mixture to mitigate risks associated with concrete
deterioration due to exposure to aggressive environment with the aim of determine its
effect on durability parameters. This study was guided by objectives considering concrete
water absorptivity, resistance to sulphate attack and its chloride permeability. Crushed
waste glass powder was added to the concrete mix at 10%, 20% and 30% by weight of
cement. Fresh concrete was subjected to slump test while hardened concrete was
subjected to compressive strength, water absorption, sulphate attack and electrical
resistivity tests. The data obtained were computed and comparison made with the control
samples at maturity and presented in forms of tables and graphs. Best results relative to
the control samples were obtained at 30% addition of crushed waste glass powder into
the concrete mix, with a notable increase in compressive strength from 32.8 N/mm2 to
42.8 N/mm2 representing an increase of 30.5%. Water absorption reduced from 1.7% to
1.6% representing a reduction of 5.9%. Sulphate attack results based on mass and length
variation showed that mass and length least increment from 38g to 40g and 5.7 mm to
5.9 mm representing an increase of 5.3% and 3.5% respectively. Electrical resistivity
reduced from 13.6 kΩ/cm to 11.6 kΩ/cm representing a reduction of 14.7%. This study
proved that addition of crushed waste glass powder to concrete mix at 30% by weight of
cement improved its permeability, reduced is susceptibility to sulphate attack although it
reduced its surface electrical resistivity. Concrete made with addition of 30% crushed
waste glass powder to concrete mix by weight of cement is therefore recommended to be
applied in areas prone to moisture ingress, for use as a sacrificial concrete against sulphate
attack such as in sewer conduit lining. Further research is recommended to determine the
possible causes of the reduction in surface electrical resistivity. | en_US |
