| dc.description.abstract | The behavior of building blocks with the partial replacement of fine aggregates by sawdust is
evaluated. The parameter adopted comprised analysis of the compressive strength according to
the treatment applied to sawdust residue. Blocks were composed by replacing fine aggregates
by sawdust at 5% weight. Before mixing the wood residues to the concrete, the former
underwent treatment so that wood residues could be compatible with the cement matrix. Two
treatment processes were investigated. The first treatment comprised the washing of residues
in an alkaline solution (lime) at a 5% proportion (weight / weight). The second treatment
comprised the immersion of the residue in aluminum sulfate. Analysis was undertaken from
compressive strength assays of the blocks on the 7th and 28th day. Results showed low
efficiency in the alkaline-based treatment (lime) and good performance in the aluminum
sulfate-based treatment. The production of masonry blocks with a replacement of 5% fine
aggregates for this type of treatment and species studied is possible. This paper reports on
experimental investigations on the effect of replacing sand with sawdust on the properties of
concrete. A concrete mix of 1:2:4 was used as control while sawdust was used to replace 25%,
50%, 75% and 100% of sand by volume. The percentage reduction in density is 5.96%,
12.44%,13.56% and 17.93% respectively while the corresponding percentage reduction in
compressive strength were 57.5%, 68.1%, 83.7%, and 87.3% respectively[1]. The results of
the study indicate that both the density and compressive strength of concrete decreased as the
percentage replacement increased but replacement of sand by sawdust produced a higher
percentage reduction in compressive strength than in density. Sawdust can potentially be used
as aggregate in the production of both non-structural lightweight concrete and structural
concrete. However, further research should be conducted to establish its suitability as aggregate
in concrete [1 | en_US |
