Abstract:
Throughout the world, concrete, the backbone of the infrastructure development of a nation, is
being widely used for the construction of most buildings, bridges, etc. And cement which is
ingredient of concrete has greenhouse effect and unsustainability of its raw materials problem. So,
cement has been partially replaced with hybrid of Egg shell powder sawdust ash to reduce impacts.
The aim of this research was to investigate the effects when cement partially replaced with hybrid
of eggshell powder and saw dust on the workability and strength of concrete.
In investigation of mechanical properties of samples cube crushing test, split tensile test and
bending test were done on cubes, cylinders and beam with various percentages of hybrids of ESP
and SDA of as 5%, 10%, and 15% by weight with equal amount of ESP and SDA. For Each H 0%, H-5%, H-10% and H-15% three beams, three cylinders and three cubes were casted for each
7
th, 14th and 28th days of test in laboratory to examine their mechanical properties.
By the testing workability fresh concrete, it has been found that there was reduction in of 6.06%
for H-5%, 15.15% for H-10% and 21.21% for H-15% with respect to H-0%.
The result of mechanical strength test on the concrete in which cement is partially replaced showed
that for compressive strength at 28th day there was increment in 4.9% for H-5, and 0.1% for H-10
and reduction in 6.6% for H-15% with respect to ES EN 1992’s compressive strength at 28th day.
The 28th day splitting tensile strength test result shows that increment in 6.1% for H-5% and 3.9%
for H-10 but reduction with 22.9% for H-15% with reference of ES EN 1992’s splitting tensile
strength requirement at 28th day. For flexural tensile strength at 28th day there was increment in
0.2% for H-5, and neither increment nor decrement for H-10 and reduction in 5.9% for H-15%
with respect to ES EN 1992’s flexural tensile strength at 28th day.
All percentage of hybrid have parabolic Compressive stress- strain curve at all days of curing as
like ES EN 1992‘s Code of standard.
In general, it can be concluded that the replacing of cement up to 10% by weight with hybrid of
ESP and SDA fulfill the Compressive, Splitting Tensile and Flexural tensile strength requirement
of ES EN 1992‘s Code of standard.
