Nanocomposites and nanomaterials

Nanomodified composites based on the extra rapid hardening Portland cement 
Sanytsky M.A., Marushchak U.D., Olevych Y.V.
Institute of Civil and Environmental Engineering, Lviv Polytechnic National University, S. Bandera str., 12, Lviv-79013, Ukraine. 
E-mail: msanytsky@ukr.net
Nanotechnology and nanoscience are creating new possibilities in field of high performance and durability concrete nano-composites and design a new generation of “nano-engineered ultra-high performance material” [1]. This investigations deal with development of the extra rapid hardening Portland cement due to targeted control of the early structure formation processes of cementitious matrix at the micro-, submicro-, nanostructural levels which related with reducing of the cement particle to nano-size ("top-down" nanotechnology), incorporation of nano-size particles of nanotubes, nano-silica, calcium silicate hydrate etc. ("bottom-up" nanotechnology), combination of nano- and ultrafine mineral components ("synergism" nanotechnology) and modifing by polycarboxylate type superplasticizer. Compressive strength of nanomodified extra rapid hardening Portland cement is 15-20 MPa after 10 h and 35-45 MPa after 24 h. Incorporation of polycarboxylate type superplasticizer with nano-designed chains, energy active nano- and ultrafine particles into the cement matrix provide significant acceleration of its early hydration kinetics and hardening due to particle packing optimization, early pozzolanic reaction with formation of additional hydrate phases, seeding effect and high water reducing effect of polycarboxylates [2]. Using of the extra rapid hardening Portland cement is a promising for development high performance and durability concrete nano-composites, in particular Rapid hardening High Strength, High Performance and Self-Compacting Fiber Reinforced concretes [3].

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2.	Маrushchak U., Sanytsky M., Mazurak T., Olevych Y. Research of nanomodified Portland cement compositions with high early age strength // Eastern Eur. J. Enterprise Technologies.-2016.-6 (84).-P. 50-57.
3.	Sanytsky M., Rusyn B., Marushchak U., Kirakevych I. High Performance concretes based on Portland cements modified ultrafine supplementary cementitious materials // 19.Ibausil -2015.-2.-Р. 1051-1058.