Experimental study on metakaolin & nano alumina based concrete

Abstract

The experimental work carries around the impact of investigation of Nano Particle like Nano Alumina (NA) and further more one of the beneficial cementitious (pozzolanic) material in cement to improve the mechanical properties of the concrete. Nano Particle and pozzolanic material is partially replaced by the weight of cementitious material into concrete. The experimental work examine was done on Nano replaced concrete were cured for 28, 56 and 90 days of water for various concrete mixes like M30, M40 and M50 to calibrate the mechanical properties of concrete like compressive strength, flexural strength and split tensile strength of concrete and also Non Destructive tests like UPV and Rebound hammer test on the hardened concrete. The workability and mechanical properties were also studied for the conventional and Nano replaced Concrete. Based on the experimental test results obtained the influence of Nano particle in concrete can be examined in both fresh and hardened state.

Characteristics of Silica Fume Nano Alumina Ternary Blended Mortar

“…Adding SF or nano-silica [1][2][3] to blended concrete causes lower early strength development and consistency due to its fineness and dilution effect in the nucleation sites. Recently, the incorporation of nano-additives such as titanium oxide, nano-silica, zinc oxide, or nano alumina (nA), has gained prominence in facilitating the production of binders with different strength and durability performances [4][5][6][7]. However, it is necessary to further improve the characteristics of silica fume (SF) blended mortar by investigating the effect of nA on the setting time, workability, strength, and thermal resistance.…”

“…Moreover, the use of nA in OPC-based binders reportedly enhances early strength and reduces porosity, particularly in the presence of lime (CaO), such as in GGBFS, due to the possible formation of calcium aluminosilicate hydrate (CASH) [4] and low ettringite [Ca 6 Al(SO 4 ) 3 (OH) 12 •26H 2 O] composition [10]. Ashok et al [7] also reported improved fresh and hardened properties of concrete of different grades following the incorporation of nA. In 2022, Prabaharan et al [11] introduced 2% nA into sillimanite-containing concrete and reported an increase in density.…”

Aptness of nano alumina (Al2O3) with high range water reducer-incorporated concrete

“…Novel work of the above-stated researchers cannot be ignored, but simultaneously it can be concluded that the effect of nano alumina (Al 2 O 3 ) on properties of fresh concrete, hardened concrete and on the microstructure of concrete incorporated with high range water reducer (HRWR) has been rarely discussed. Farzadnia et al (2013), Oltulu and S ahin (2011), Oltulu and S ahin (2013), Orakzai (2021) and Ashok et al (2021) neglected the effect of nano alumina (Al 2 O 3) on HRWR-incorporated concrete. The role of superplasticizer (SP) in the construction industry cannot be neglected as SP is used to increase workability without changing the water/ cement ratio.…”

“…Similarly when the binary combination of nano alumina (Al 2 O 3 ) and nano-titanium dioxide (nano-TiO 2 ) was incorporated by Orakzai (2021), in concrete it was observed 0.5% and 1% nano alumina (Al 2 O 3 ) and nano-titanium dioxide (nano-TiO 2 ) by weight of cement enhanced the compressive, splitting tensile and flexural strength by 42%, 34% and 28%, respectively, in comparison to control mix (Orakzai, 2021). When Ashok et al (2021) used nano alumina (Al 2 O 3 ) along with metakaolin in M30, M40 and M50 grade concrete, it was observed that mechanical properties improved while water absorption was reduced (Ashok et al ,2021).…”