Sugarcane Bagasse Ash as Partial Replacement of Cement in Concrete Production
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Date
2019-07
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Addis Ababa University
Abstract
Sugarcane bagasse ash is a byproduct from cogeneration boilers of sugar industries
found after the extraction of all economical sugar from sugar cane. The disposal of this
agricultural waste causes environmental problems around the sugar industries. Cement
industry also creates environmental problem by emission of carbon dioxide during
manufacturing of cement and consumes lot of raw materials. Therefore, this research
deals sugarcane bagasse ash as partial replacement of cement in concrete production.
First the sugarcane bagasse ash samples were collected from Wonji sugar factory.
Sugarcane bagasse ash was sieved with 250µm sieve size. M25 grade strength of
concrete were deign with five different proportions of concrete mixes. Sugarcane bagasse
ash ranging from 5% to 20% by weight of cement including the control mix was prepared
with a water cement ratio of 0.45. For each substitution ratio, 3 sets (a total of 12)
concrete specimens were prepared for compressive strength test conducted at the age of
7, 14, 21 and 28 days. For this experimental work a total of 60 cubic concrete specimens
for compressive strength test and 15 cylindrical concrete specimens for water absorption
test were casted. Sugar cane bagasse ash has shown low density and higher surface area
as compared to cement. The chemical composition of bagasse ash, combined value of
SiO2, Al2O3, and Fe2O3, investigated in this study was 87.68 which is higher than the
standard, value 70%, and qualifies to be a Class N Pozzolan. The results of the
compressive strength of concrete work have shown that up to 5% replacement of the
ordinary Portland cement by bagasse ash is possible. In addition, higher compressive
strength at all test ages, 7, 14, 21 and 28 days, were observed. The 21and 28 day
compressive strength value of concrete with 5% sugarcane bagasse ash replacement was
showing a strength enhancement of about 8% and 6%, respectively. The Water
absorption of concrete increases with increasing the sugarcane bagasse ash content of
concrete with the exception of water absorption for the concrete with 5% sugarcane
bagasse ash. 5% partial replacement of cement by sugarcane bagasse ash in concrete
production results in a similar concrete properties and higher replacement could also be
used with a slight reduction in the performance of the concrete.
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Keywords
Sugarcane bagasse Ash, Cement, Concrete, water absorption, Compressive Strength