Investigation into Porosity Indices of Nanofiber-Reinforced Concrete

• Published in: Journal of engineering physics and thermophysics 2024-03, Vol.97 (2), p.417-423
• Main Authors: Zhdanok, S. A., Leonovich, S. N., Sadovskaya, E. A.
• Format: Article
• Language: English
• Subjects: Basalt; Carbon nanotubes; Classical Mechanics; Coarseness; Complex Systems; Engineering; Engineering Thermodynamics; Fiber reinforcement; Heat and Mass Transfer; Industrial Chemistry/Chemical Engineering; Literature reviews; Nanofibers; Nanostructures; Porosity; Reinforced concrete; Reinforcing steels; Rigid structures; Steel wire; Thermodynamics; Water absorption
• ISSN: 1062-0125; 1573-871X
• DOI: 10.1007/s10891-024-02908-z

A literature review has been carried out on the effects of carbon nanotubes (CNT) and macrolevel fiber on concrete porosity indices. The results are presented of investigations into the porosity of nanomodified concrete with dispersed reinforcement (nanofiber reinforced concrete) in terms of the kinetics of water absorption of nanotubes and hard fiber. For dispersed reinforcement, use was made of various hard fibers and their combinations: polymer, basalt, steel wire ones and those from wave-, anchor-, and straight profile sheets. It has been established that the introduction of dispersed fibers results in a change of concrete porosity indices. Hard fibers break up relatively large capillary pores into smaller ones. In this case, the fiber coarseness and its amount in a volume are important. In integrated fiber reinforcement, the size of capillary pores either decreases or does not change at all with respect to the initial concrete. Intense mechanical mix agitation contributes to raising the porosity index. Hard fibers of a more rigid structure tend to demonstrate a higher propeller effect in mixing. The presence of different-scale hard fibers makes it possible to avoid a propeller effect and the need to increase the concrete porosity index.