Abstract
Throughout the construction life, nanoparticles can change and modify the properties and functions of cement-based materials. The traditional cement materials have weak sustainability characteristics insufficient to develop high quality performance structures. Besides that, modifications of compressive and tensile strength and durability durations of cement composites are required. Consequently, a suitable range of Carbon nanotubes (CNTs) concentrations were applied to improve these certain properties. This review presents analysis of the earlier techniques of adding CNTs to cement composites and its influence to mechanical properties and durability. The detailed interactions of CNTs with cement composites, dispersion of CNTs, durability and mechanical performance measurements are addressed from several researches. CNTs addition contributes in adjustment of cement composite microstructures, hence improving the functional components and mechanical properties. If a proper dispersion of CNTs achieved, hydrate products of cement including C-S-H and Ca(OH)2 interact with active CNTs, resulting in decrement of porosity of Portland cement composites which filled up by CNTs proportions leading to increase the mechanical strength. Therefore, this paper present state of the art regarding applications of the additive CNTs in cement composite, the reviewing results of CNTs-cements shows a positive influence on mechanical strength and durability.
Highlights
The scientific revolution will be nanotechnology which is nowadays widely involved in several construction and structural industries
Carbon nanotubes (CNTs) mainly consists of graphene sheets rolled up as cylindrical tubes where it can be single or multiple depending on the number of internal layers
More and different percentages of CNTs content are required for further and accurate investigation which stated as following: 4.1 CNTs levels up to 0.15% According to Xu et al [21] the addition of few amount of multi-walled carbon nanotubes (MWCNT) about 0.01% to the weight of cement mortars, where this MWCNTs interact with H2SO4 & HNO3, and two dispersion substances used which are carbonyl and aqueous dispersions to facilitate the process
Summary
The scientific revolution will be nanotechnology which is nowadays widely involved in several construction and structural industries. The demand for smart structures able to give a strong response for any external effects is growing every year, where many researchers focused on developing multifunctional materials having high structural properties and combining some functional applications [1]. As it is known, cement composites provide functional properties which play a potential role in construction application. Different studies on the addition of CNTs into cement composites and the influence and changes in the properties and behavior of CNTs-cement based composites in terms of compressive, flexural strength, microstructure, and durability have been investigated
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