Abstract:
The use of conventional materials is facing two main challenges of high cost and
large-scale depletion of the sources thus creating environmental problems. These
challenges demand that alternative materials be explored that are not only affordable
but are also environmentally friendly. In this regard, laterized quarry dust and
recycled concrete are proposed as possible alternative building material.
To date, extensive studies have been done on laterite, quarry dust and recycled
aggregates, separately. However, there is lack of data on performance of blended
materials as well as large scale tests on structural elements made from the alternative
materials. This research therefore seeks to assess the performance of blended
alternative materials when used in concrete and blocks. In the study, samples of
materials were investigated to determine basic properties following which the
optimum proportions of ingredient materials were determined for concrete and block
mix. Finally, the viability of using the materials was assessed for large scale
concrete beams and wall panels.
The results demonstrate that there is great potential of laterized quarry dust concrete
and blocks. When recycled concrete aggregates are used, 30% of river sand can be
replaced with laterized quarry dust and still attain compressive strength of 20
N/mm2. In addition, the flexural capacities of alternative as well as conventional
concrete beams were found to be within 5%. The findings are intended to contribute
to sustainable construction of low cost housing and development.
