Effect of Magnesium Sulphate on Calcined Clay Brick Powder Cement Replaced Mortar

Aliyu I., Tasiu Ashiru Sulaiman, Mohammed Ashiru, Muktar I.

Abstract


This paper determines the resistance to Magnesium sulphate (MgSO4) of Mortar produced with calcined clay brick powder (CCBP) as partial cement replacement at 0 %, 5 %, 10 %, 15 %, and 20 %. A total of ninety (90) 160*40*40 Prisms were cast and cured in water for 7, 14, and 28 days. 45 prisms were transferred into 0.5 M MgSO4 solution after these days and compressive strength test conducted after 28 days in the solution, the remaining 45 prisms were immediately subjected to the test on these days as control. The slump test results indicated that the workability decreases as the percentage addition of CCBP content increases. The cement paste consistency test and the initial and final cement setting times increases with an increase in CCBP content.  The compressive strength results of the CCBP-mortar showed an increase in the strength with curing age and a decrease with CCBP content (%) addition. Compressive strength development of samples cured for 7 days in water continued under the MgSO4 solution while a reduction in compressive strength was observed for samples cured in water for 14 and 28 days, moreover, compared with control, samples containing CCBP possess higher resistance to the MgSO4 solution because the control samples showed more deteriorations after exposure. It was found that 5% CCBP is the optimum as it has the highest compressive strength and showed the highest resistance to the MgSO4 solution. It was concluded that powdered calcined clay brick could provide a valuable source of mineral replacement for cement for increased mortar durability under an aggressive environment.


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References


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