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Feasibility Studies on Usage of Agro-Forestry-Based Ash as a Cement Replacement in Concrete Open Access


Other title
Cement Replacement
Agro-Forestry-Based Ash
Type of item
Degree grantor
University of Alberta
Author or creator
Setayesh Gar, Parisa
Supervisor and department
Dr. Vivek Bindiganavile
Examining committee member and department
Dr. Carlos Cruz Noguez, Civil & Environmental Engineering, Structure Group
Dr. Yaman Boluk, Civil & Environmental Engineering, Structure Group
Department of Civil and Environmental Engineering
Structural Engineering
Date accepted
Graduation date
Master of Science
Degree level
This study is part of a joint Canada-India research program to effect sustainable construction. Alberta generates a significant amount of waste from agricultural- and forest-based industries. Similarly, India has lots of sugar cane bagasse waste. Researchers in both countries want to use these forms of waste in concrete, not only to solve the problem of land filling, but also to use it, if possible, as a supplementary cementing material to reduce the economic and environmental cost of concrete. In the present investigation, a feasibility study is made to examine agro-based ashes as supplementary admixtures in concrete. These agro-based ashes are waste generated from pulp and paper mills, typically consisting of a mixture of hardwood and softwood barks and their fine residues. Also, ash resulting from sugar cane bagasse, which is burnt as fuel in sugar mills, has also been investigated as a pozzolanic admixture, especially for resistance to sustained elevated temperatures. All of the ash samples were first characterized for chemical composition and physical properties, including grain-size distribution, density and chemical composition. Subsequently, the ash was added to concrete as a supplementary cementing material to study the compressive and tensile performance of hardened concrete. With sugar cane bagasse ash, specimens of concrete incorporating different percentages of ash as a mass replacement of Portland cement were subjected to compression and split tensile tests under different temperatures. From the strength point of view, the results are encouraging: for example, when the dosage level of Alberta`s agro-based ashes ii was as high as 15%, the strength was still seen as promising. The findings strongly endorse that sugar cane bagasse ash imparts resistance to concrete against elevated temperatures and may be used as a supplementary cementing admixture. Results show that these agro-based ashes can be used in normal-strength concrete buildings.
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