Nanoscience of Cement and Concrete
TL;DR: In this paper, the authors have discussed the role of different type of nanoparticles in cement and concrete and used them to enhance the understanding of concrete behavior, to engineer its properties and to lower production and ecological cost of construction materials.
About: This article is published in Materials Today: Proceedings.The article was published on 2017-01-01. It has received 64 citations till now. The article focuses on the topics: Portland cement.
Citations
More filters
TL;DR: In this article, the combined effects of micro-silica (MS) and nano-silica (NS) on the compressive behavior of concrete were investigated, and the combined usage of MS and NS offers certain synergistic effect, as evaluated by a new formula proposed in this study.
69 citations
TL;DR: In this paper, an industrial applicable mixing method was applied to strengthen recycled aggregate concrete by using ultra-densified slurry, where nano-silica with high reactivity was incorporated in the strengthening surface-coating slurry.
62 citations
TL;DR: This review presents recent researches about the main effects on performance of cement-based composites caused by the incorporation of nanomaterials, which have a great potential for applications in smart infrastructure based on high-strength concrete structures.
Abstract: Modern concrete infrastructure requires structural components with higher mechanical strength and greater durability. A solution is the addition of nanomaterials to cement-based materials, which can enhance their mechanical properties. Some such nanomaterials include nano-silica (nano-SiO2), nano-alumina (nano-Al2O3), nano-ferric oxide (nano-Fe2O3), nano-titanium oxide (nano-TiO2), carbon nanotubes (CNTs), graphene and graphene oxide. These nanomaterials can be added to cement with other reinforcement materials such as steel fibers, glass, rice hull powder and fly ash. Optimal dosages of these materials can improve the compressive, tensile and flexural strength of cement-based materials, as well as their water absorption and workability. The use of these nanomaterials can enhance the performance and life cycle of concrete infrastructures. This review presents recent researches about the main effects on performance of cement-based composites caused by the incorporation of nanomaterials. The nanomaterials could decrease the cement porosity, generating a denser interfacial transition zone. In addition, nanomaterials reinforced cement can allow the construction of high-strength concrete structures with greater durability, which will decrease the maintenance requirements or early replacement. Also, the incorporation of nano-TiO2 and CNTs in cementitious matrices can provide concrete structures with self-cleaning and self-sensing abilities. These advantages could help in the photocatalytic decomposition of pollutants and structural health monitoring of the concrete structures. The nanomaterials have a great potential for applications in smart infrastructure based on high-strength concrete structures.
58 citations
Cites background from "Nanoscience of Cement and Concrete"
...For instance, CNTs have high mechanical performance with high aspect ratios (length to diameter ratio) that may generate stronger cement composites [27]....
[...]
...generated during the production of ordinary Portland cement can represent approximately between 5% and 7% of the world man-made emissions of this gas [27,28]....
[...]
...This poor dispersion may cause defects zones in cement/CNTs composites, which constrain the use of CNTs in cementitious matrices [27]....
[...]
...Thus, it catalyzes the degradation of organic matters located at the nano-TiO2 coated concrete surface [27]....
[...]
TL;DR: In this article, the authors present a review of the properties and properties of mixed alkali-activated metakaolin cements incorporating with mineral supplementary materials from the point of view of the supplementary additions raw materials base, features of reaction products, structure, properties and formation process.
Abstract: Incorporation of mineral blending and/or modifying additions which are single- or multi-component materials is one of the main trends in the development of both Portland clinker-based and non-clinker cements. There is an increasing scientific and industrial interest in alkali-activated binders as ecologically and technically promising inorganic materials. Progress in this area is also derived from advances in the technologies of production and processing of a wider range of mineral materials from natural and waste origins, and by constant expansion of the raw materials base of alkali-activated materials. This paper reviews (i) alkali-activated metakaolin-based cements incorporated with mineral supplementary materials from the point of view of the supplementary additions raw materials base, features of reaction products, structure, properties and formation process; (ii) a range and classification of mineral additions to alkali-activated metakaolin cements; (iii) the feasibilities of improving the structure and properties of mixed alkali-activated metakaolin cements.
56 citations
TL;DR: In this paper, the authors investigated approaches such as RPC, steel fiber reinforcement, green cement, advanced nano cement and self-consolidating and how they contribute to environmental sustainability and reduction of costs of construction.
47 citations
References
More filters
TL;DR: In this article, the authors review recent progress and advances that have been made on: (a) dispersion of CNTs in a polymer matrix, including optimum blending, in situ polymerization and chemical functionalization; and (b) alignment of CNNs in the matrix enhanced by ex situ techniques, force and magnetic fields, electrospinning and liquid crystalline phase-induced methods.
Abstract: Polymer/carbon nanotube (CNT) composites are expected to have good processability characteristics of the polymer and excellent functional properties of the CNTs. The critical challenge, however, is how to enhance dispersion and alignment of CNTs in the matrix. Here, we review recent progress and advances that have been made on: (a) dispersion of CNTs in a polymer matrix, including optimum blending, in situ polymerization and chemical functionalization; and (b) alignment of CNTs in the matrix enhanced by ex situ techniques, force and magnetic fields, electrospinning and liquid crystalline phase-induced methods. In addition, discussions on mechanical, thermal, electrical, electrochemical, optical and super-hydrophobic properties; and applications of polymer/CNT composites are included. Enhanced dispersion and alignment of CNTs in the polymer matrix will promote and extend the applications and developments of polymer/CNT nanocomposites.
1,848 citations
TL;DR: In this paper, the state of the field of nanotechnology in concrete is reviewed and the impact of recent advances in instrumentation and computational materials science and their use in concrete research is discussed.
1,385 citations
TL;DR: In this paper, a composite cement material is prepared from cement material and carbon nanotubes, wherein the carbon-nanotubes are present from about 002 wt % to about 1 0 % based on the weight of the cement material.
624 citations
TL;DR: In this paper, the effects of nanosilica addition on hydration kinetics, microstructure refinement, fresh/hardened properties and durability characteristics of concrete are summarized.
505 citations
TL;DR: A review of these innovative achievements can be found in this article, where the authors focus on the potential of improving concrete properties by modifying the structure of cement hydrates, addition of nanoparticles and nanotubes and controlling the delivery of admixtures.
Abstract: Concrete science is a multidisciplinary area of research where nanotechnology potentially offers the opportunity to enhance the understanding of concrete behavior, to engineer its properties and to lower production and ecological cost of construction materials. Recent work at the National Research Council Canada in the area of concrete materials research has shown the potential of improving concrete properties by modifying the structure of cement hydrates, addition of nanoparticles and nanotubes and controlling the delivery of admixtures. This article will focus on a review of these innovative achievements.
385 citations