Effects of recycled paperboard mill wastes on the properties of non-load-bearing concrete|
Seyyedalipour, S. F.; Yousefi Kebria, D. & Dehestani, M.
Population growth and increasing demand for
industrial enterprises such as pulp and paper production
lead to environmental problems such as over-exploitation
of resources and pollution of soil, air and water. Thus, for
the importance of reducing the negative effects of incineration
and landfilling of wastes for the protection of
environment, two kinds of recycled paperboard mill wastes
were used as partial replacement of sand (volume percentage),
to produce non-load-bearing lightweight concrete.
Waste type 1 consists of paperboard chips mixed
with small amount of sand, and waste type 2 consists of
paperboard chips mixed with expanded polystyrene and
nylon. This study was carried out in laboratory scale to
achieve acceptable strength and minimum density by using
maximum amount of waste, in accordance with ASTMC129
for non-load-bearing lightweight concrete construction.
Therefore, three types of concrete, including concrete
containing waste type 1 (replacing 0, 60, 70 and 80 % of
waste and sand), concrete containing waste type 2 (replacing
0, 55, 75 and 95 % of waste and sand) and concrete
containing both waste types, were constructed. Different
tests on the fresh and hardened concrete, including slump,
pH, oven-dry density, compressive and tensile strengths,
flexural strength, flexural toughness and water absorption,
were carried out. The results indicate that the use of waste
type 1 is more reliable than waste type 2 in terms of concrete
specifications and standard-conforming viewpoints.
Results revealed that use of these wastes in concrete can
save the paperboard industry disposal costs and produce
‘greener concrete’ for construction.
Lightweight concrete; Compressive strength; Oven-dry density; Greener concrete