Abstract:
Some of the materials that were once deemed trash, such as waste oils, plant-based additives,
sulfur, etc., are now being included in the asphalt as extenders and additives. Wall paint scrapings
from homes, construction sites, and repainting shops were collected for this research and used in
Hot Asphalt Mix (HMA) as a filler and/or extender. Although it is advised that paint scraps be
collected through a closed cycle system where dust containment is assured, this is not done in
practice. Plastic-based paints can be heated and added to bitumen as a filler. Filler materials can
be made from melting enamel-based paints. Paint scrapings were gathered from homes, paint
stores, and construction sites, then pulverized to the appropriate fineness for the investigation.
Some paints, especially those made of plastic or enamel, proved difficult to pulverize. These types
of paints were shredded into thin strips and blended with hot bitumen (Pen 60-70 grade). Using
stone dust as a standard, powdered paint scrapings were applied to asphalt at varying replacement
rates (from 0% to 100%). Marshall stability data show a little increase due to powered paint waste
relative to the baseline. However, when Indirect Tensile Test (IDT) is used to measure Tensile
Strength Ratio (TSR), moisture resistance both improves and degrades for different filler
percentage replacement cases. Some improvement in stability values was seen after both variants
of paints were added to bitumen. In conclusion, a slight increase in the strength of the asphalt mix
can be attributed to paint-based filler and/or extenders, which can be compensated by the increase
of moisture resistance in some cases and excellent economic prospects. In addition, certain paints
may include carcinogenic or heavy metal ingredients. Since these materials may or may not leach
into the environment if they wind up in a landfill, their incorporation into pavement construction
while encased in a water-resistant bituminous matrix may or may not be the best option depending
on the filler replacement percentage
Description:
Supervised by
Dr. Nazmus Sakib,
Assistant Professor,
Department of Civil and Environmental Engineering (CEE),
Islamic University of Technology (IUT) Board Bazar, Gazipur, Bangladesh
