Influence of pozzolanic addition on strength and microstructure of metakaolin-based concrete.

Influence of pozzolanic addition on strength and microstructure of metakaolin-based concrete.

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The intent of this study is to explore the physical properties and long-term performance of concrete made with metakaolin (MK) as a binder, using microsilica (MS) and nanosilica (NS) as substitutes for a portion of the ordinary Portland cement (OPC) content.The dosage of MS was varied from 5% to 15% for OPC-MK-MS blends, and tasoliesi the dosage of NS was varied from 0.5% to 1.5% for OPC-MK-NS blends.

Incorporation of these pozzolans accelerated the hardening process and reduced the flowability, consistency, and setting time of the cement paste.In addition, it produced a denser matrix, improving the strength of the concrete matrix, as confirmed by scanning electron microscopy and X-ray diffraction analysis.The use psr-sx600 of MS enhanced the strength by 10.37%, and the utilization of NS increased the strength by 11.

48% at 28 days.It also reduced the penetrability of the matrix with a maximum reduction in the water absorption (35.82%) and improved the resistance to the sulfate attack for specimens containing 1% NS in the presence of 10% MK.Based on these results, NS in the presence of MK can be used to obtain cementitious structures with the enhanced strength and durability.