American Journal of Chemical Engineering
Volume 8, Issue 5, September 2020, Pages: 103-111
Received: Sep. 2, 2020;
Accepted: Sep. 18, 2020;
Published: Sep. 28, 2020
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Olubajo Olumide Olu, Department of Chemical Engineering, Faculty of Engineering, Abubakar Tafawa Balewa University, Bauchi, Nigeria
Osha Odey Ade, Department of Chemical Engineering, Faculty of Engineering, University of Calabar, Rivers, Nigeria
Abubakar Jibril, Department of Chemical Engineering, Faculty of Engineering, Abubakar Tafawa Balewa University, Bauchi, Nigeria
This paper investigates the potentials of replacing cement with Locust beans pod ash (LBPA) and Eggshell ash (ESA) on the setting time properties of cement blends such as consistency and initial and final setting times. It also covers a comparative analysis on consistency and setting time results of the cement blends and control. The consistency and setting times of control and twenty-eight (28) cement blends were conducted via Vicat apparatus and Toniest machine respectively according to ASTM standards. The locust bean pod and eggshell powder were calcined at 850°C and 500°C for 1 hour respectively to obtain the LBPA and ESA. Results indicated a variation in the water consistencies of cement blended with either/both ashes at various LBPA/LBPA-ESA ratios as cement replacement was increased from 0-10 wt.%. The increase in the water consistencies could be attributed to the diminution of C3S in cement, the unburnt carbon present in the ashes coupled with the porous nature of LBPA and narrower particle size distributions of the cement blends. Whereas, the decrease in the water consistency could be linked with wider particle size distribution. The initial setting times of LBPA cement blends experienced a series of retardations and acceleration while the final setting time experienced a series of accelerations and elongations as the cement replacement was increased. On the other hand, as the cement replacement level was increased, the initial and final setting time of ESA cement blends experienced a retardation followed by accelerations and a series of accelerations and retardations respectively. Similarly, the replacement of ESA with LBPA at various cement replacement led to a variation in both setting times (series of accelerations and retardations) of cement blends. The retardation in the setting times could be linked to the diminution of clinker content or formation of magnesium hydroxide Mg(OH)2, the presence of unburnt carbon in ashes and narrower particle size distribution of the cement blends while the acceleration of the setting times are related to interaction between tricalcium aluminate and limestone to favor ettringite at the expense of monosulfate and a wider particle size distribution of the cement blends. Most of the setting time results for cement blends except 7.5 and 10 wt.% LBPA cement blends were higher than control and all the cement blends were found to fall within standards for various applications.
Olubajo Olumide Olu,
Osha Odey Ade,
Setting Times of Portland Cement Blended with Locust Bean Pod and Eggshell Ashes, American Journal of Chemical Engineering.
Vol. 8, No. 5,
2020, pp. 103-111.
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