Partial Replacement of Cement with Bagasse Ash in Hot Mix Asphalt
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Date
2019-07
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Addis Ababa University
Abstract
Today, the increasing demand and scarcity of construction materials like cement forced most
researchers around the globe to focus on finding ways of utilizing either industrial or agricultural
wastes/locally available materials as a source of raw materials and ecofriendly substitutes or
alternatives for the improvement of pavement quality. These wastes utilization would, not only
be economical, but may also help to create a sustainable and pollution free environment as the
disposing of such wastes is tedious but, promoting towards waste management. Sugar-cane
bagasse is one among the fibrous waste product of the sugar processing industry. Hot Mix
Asphalt Mixtures (HMA) is a composite material consisting of mineral aggregates, filler/cement,
asphalt binder and air voids. In addition, the current increment in energy cost and demand evokes
the need for improving pavement quality either by modifying or replacing the cement partially or
totally. Moreover, this study is intended for partially replacement of cement with bagasse ash in
hot mix asphalt (HMA).
The study investigates the partial replacement of cement with bagasse ash in hot mix asphalt
using Marshall Flow and Stability tests with corresponding volumetric properties. Tests on the
suitability of materials used and their performance in terms of known engineering properties
were carried out with bitumen content of 4.0%, 4.5%, 5.0%, 5.5% and 6.0%. The focus involves
the partial replacement of cement with BA in the order of 0%, 10%, 20%, 30%, 40% and 50%
which ninety mix specimens were produced to conduct the tests.
The asphalt mixture testing includes the Marshall Mix design which was used to determine the
Optimum Bitumen Content (OBC) for the conventional HMA. The asphalt binder was replaced
by the 20 percentages of cement using the OBC. The results obtained shows that the Cement/BA
mixes exhibit satisfactory trend result with average bitumen content of 5.5%. However, this
research concluded that partial replacement of cement with bagasse ash as filler in hot mix
asphalt has no significant effect on performance or volumetric properties of asphalt concrete
except on stability at lower bitumen content and flow at higher bitumen content, since the
percentage of filler is too small.
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Keywords
Hot Mix Asphalt, Bagasse Ash, Binder Content, Replacement of Cement