INGENIEUR
‟
One of the interesting findings of the study is that the enhancement in concrete mechanical properties is due to the incorporation of both fine and coarse bottom ash in plain concrete .
strength values within the range of 21.88MPa to 37.28MPa and flexural strength in the range of 1.87MPa to 5.87MPa . The flexural strength ( fr ) is calculated as the square root of the cube of the compressive strength ( f ’ c ) using the figures obtained in the current study and the hypothetical flexural strength figures based on those suggested by the ACI Committee [ 26 ]. The correlation between flexural and compressive strengths of coal concrete are expressed as fr = 0.961√f ’ c . However , ACI Committee reported flexural and compressive strengths of 363 ( fr = 0.94√f ’ c for 21MPa < f ’ c << 83MPa ), which are somewhat lower than the values obtained in this study .
CONCLUSION
In conclusion , coal waste shows an acceptable characteristic as an aggregate and can be used in concrete production . The density of coal concrete is 19 % lower than the control concrete which consists of granite and sand as aggregates . Upon applying both coarses as well as fine bottom ash the concrete density was below 2000kg / m 3 . Coal concrete has a comparable compressive strength with control concrete at a later age due to the pozzolanic reaction . One of the interesting findings of the study is that the enhancement in concrete mechanical properties is due to the incorporation of both fine and coarse bottom ash in plain concrete .
Acknowledgement The authors are grateful to the Ministry of Higher Education , Malaysia ( MoHE ) and Research Management Centre ( RMC ), Universiti Teknologi Malaysia ( UTM ) for financial support under grant : Q . J130000.2451.04G63 and Q . J130000.2451.04G58 . The authors are also thankful to the staff of Materials & Structures Laboratory , School of Civil Engineering for the facilities and support for the experimental work .
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64 VOL 83 JULY-SEPTEMBER 2020