Production of environmentally friendly building materials with use of pulp and paper sludge
E. S. Shirinkina
Section: Ecologization of industry
The paper presents the research in the field of using pulp and paper sludge as a resource in the production of environmentally-
friendly building materials. During the analysis of scientific and technical information, it was found out
that pulp and paper sludge, containing cellulose fiber and secondary sludge, can be used as an additive in the production
of composite materials, insulation boards, light aggregates for concretes and combustible additives for production of
ceramic bricks. In the laboratory, the possibility of obtaining a ceramic brick with addition of pulp and paper sludge in
an amount of 4 and 8% by weight was researched. It was found that when pulp and paper sludge is introduced into the
ceramic mass, the density of the bricks samples decreases, linear air shrinkage decreases to 2.7% (for samples with pulp
and paper sludge addition in quantity of 4% mass), and 9.1% (for samples with pulp and paper sludge addition in quantity
of 8% mass) in comparison with control samples without pulp and paper sludge addition, fire shrinkage decreases from
5.1% to 3.65% and 2.06% for samples with pulp and paper sludge content 4% and 8% mass respectively. Compressive
strength of researched samples with pulp and paper sludge content significantly increases (to 90.2%) in comparison
with the control samples, which is due to the release of additional thermal energy during the combustion of the pulp and
paper sludge in the ceramic mass while the brick firing process. It has also been established that the bending strength
of researched samples is reduced in comparison with the control samples, but with an increase of firing temperature to
1070 оC, an increase in bending strength has also been achieved. A comparative analysis of the obtained data on the
strength of ceramic brick samples with the requirements of National State Standard showed that when the pulp and
paper sludge is introduced into the ceramic mass in an amount of 4–8% by weight, as a combustible additive, it is
possible to obtain solid ceramic brick suitable for building.
Keywords: pulp and paper sludge, secondary sludge, primary sludge, cellulose fiber, combustible additive
Article published in number 4 for 2018 DOI: 10.25750/1995-4301-2018-4-078-085
ISSN 1995-4301
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