Inclusion of nano metaclayed as additive in ultra high performance concrete (UHPC)

The utilisation of Ultra High Performance Concrete (UHPC) tailored with nano materials has growing an interest to the construction. In this research, nano metaclay UHPC mixes were used as additive range from 1, 3, 5, 7 and 9 percent from cement weight. The effect of nano metaclayed UHPC was evaluated in the forms of physical, workability, strength property and morphology of the microstructure in the UHPC and compared to the normal UHPC and metakaolin UHPC. For physical property, the nano metakaolined paste was confirmed using vicat apparatus and determination of fresh property was conducted using slump test. Meanwhile, compressive strength was conducted at 3, 7, 28 and 90, 180 and 365 days of age. The UHPC morphology was analysed using Scanning electron microscope (SEM). It can be concluded that the introduction of nano metaclay in UHPC increase the water demand in UHPC by increase the surface area. For compressive strength, introduction of nano metaclay shows no significant effect at early ages but gradually increase at later ages as compared to the plain UHPC. (C) 2019 Elsevier Ltd. All rights reserved.