Pozzolanic Strength Activity Index of Metakaolin Processed from Kankara Kaolin According to BS EN 450-1

Ibrahim Aliyu, Lawan Adamu, Jibrin Mohammed Kaura, Aliyu Abdulhamid Ozovehe

Abstract


Locally sourced natural pozzolanas in Nigeria need to be assessed in terms of their suitability for use in cement production because the use of pozzolanas has recently gained importance. In this study Metakaolin as a pozzolan processed from Kankara kaolin was studied for its suitability in cement production using the pozzolanic strength activity index (SAI) approach. The kaolin clay was beneficiated, ball-milled, and calcined at 750 o C for 2 hours to produce the metakaolin. The SAI test was performed according to BS EN 450-1 with 25 % of cement replaced by the pozzolan to produce the pozzolan mortar and 100 % cement for the control mortar. The metakaolin produced with a sum of Al2O3, SiO2, and Fe2O3 of 98 % and the sum of CaO and MgO of 0.75 % respectively satisfies ASTM C618-05 limits of ≥ 70 % and ≤ 5 %. It was observed that both the pozzolan and control mortar samples recorded increased compressive and flexural strength with curing age with samples containing the pozzolan having higher strength values, also, the flexural strength of all the mortar samples was found to be in the range of 32 % to 47 % of the compressive strength. The SAI test of the metakaolin (pozzolan) recorded an index of > 100 % in compression and ≥ 89 % in flexure passing BS EN 450-1 limit of ≥ 75 % at 28 days. These findings revealed that pozzolan processed from Kankara kaolin having satisfied the code limits is a good pozzolan and its use as a pozzolan in mortar and concrete production should be encouraged.


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References


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