Thesis Open Access

INVESTIGATING MECHANICAL PROPERTIES OF ANIMAL BONE POWDER PARTIALLY REPLACED CEMENT IN CONCRETE PRODUCTION

BEKA BENTI TESHOME

Thesis supervisor(s)

Tesfaye Alemu(Phd)

Concrete is the most important construction material in great demand. In concrete
production, portland cement is a major constituent. However, in time cement cost is
increasing. This surge in price a challenges in construction industry and there is a demand in
finding alternative environmental friendly cement partial replacing material without
compromising mechanical properties of structural concrete.
This research experimentally investigated use of animal bone powder (ABP) as partial
replacement of cement in structural concrete production. Five groups of C-25 concrete grade
specimens with (0%, 5%, 10%, 15%, & 20%) varied proportion of animal bone powder
(ABP) by weight were casted and tested for fresh concrete (slump test) and hardened
concrete mechanical properties such as compressive strength, split tensile strength and
flexural strength at different ages. MP-AES (Microwave Plasma-Atomic Emission
Spectroscopy) for elemental analysis showed that ABP is reach in calcium (contained about
58.64% of calcium, Ca) where the amount of Si, Al and Fe are very small. A total of 180
concrete specimens were casted at Adama Science & Technology University & tested at
Addis Ababa Science & Technology University. The recorded 28th mean compressive,
flexural and split tensile strengths for 0%, 5%, 10%, 15% & 20% replacement of cement by
ABP were (33.63, 30.45, 28.20, 23.64, 20.59 , 3.62, 3.21, 3.04, 2.86, 2.63, 4.39, 3.77, 3.42,
3.21, & 2.68)MPa respectively. This study revealed that as the percent addition of ABP
increases, its strength significantly declined from the control specimen. Also, test results
indicated that optimum cement partial replacing amount of animal bone powder (ABP) is
10% by weight.
 

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