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Application of Nanotechnology in Building Composites

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Construction and Building Materials".

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 4879

Special Issue Editor


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Guest Editor
Department of Mechanics, Faculty of Civil Engineering, Czech Technical University in Prague, 166 29 Prague, Czech Republic
Interests: nanoindentation; micromechanics; cement and concrete composites; fly-ash; alkali-activated materials; novel metallic micro-structures; thin films; materials characterization; multi-scale modeling; durability of concrete; nanotechnology of concrete
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Special Issue Information

Dear Colleagues,

The development of nanotechnologies in recent years has influenced the sphere of building materials on a large scale. Characterization of small volumes of material using techniques, such as nanoindentation, AFM, micro-CT, and NMR, enabled the acquisition of unique data on the microstructure of composite building materials and opened the way to modify these materials, improve their properties, and quantify new properties. Advances have been made in the use of nanomaterials in fresh blends to change their viscosity and processability. Nanoparticles serve as reinforcements, densifiers, or hydration modifiers in the microstructure of composites and work to improve the resulting elastic, strength, fracture, thermal, or electrical properties of the composites. Nanomaterials are used as corrosion inhibitors and coatings. Active surfaces (self-cleaning, hydrophobic, or icephobic) were prepared by applying nanomaterials to building materials. The field of application of nanotechnologies in building materials is already very wide.

The Special Issue will gather contributions that describe new approaches and the latest achievements and advances in the application of nanotechnologies, advances in the characterization of material nanolevel, or nanomodifications of building materials. Bulk, surface, fresh mixture, or hardened state applications are of interest. The Special Issue welcomes research articles and reviews on relevant topics. It is my pleasure to invite you to contribute to this Special Issue.

Prof. Dr. Jiří Němeček
Guest Editor

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Keywords

  • building composites
  • nanotechnology
  • nanoparticles
  • nanostructures
  • nanomaterials
  • microstructure modifications
  • microstructure characterization

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Published Papers (2 papers)

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Research

15 pages, 2546 KiB  
Article
Influence of Nanofibrillated Bacterial Cellulose on the Properties of Ordinary and Expansive Mortars
by Emika Kuroiwa, Nguyen Xuan Quy and Yukio Hama
Materials 2022, 15(6), 2094; https://doi.org/10.3390/ma15062094 - 11 Mar 2022
Cited by 3 | Viewed by 1702
Abstract
This study uses two types of nanofibrillated bacterial cellulose (NFBC), a culture solution containing NFBC (Bf) and a purified solution (Pf), to investigate the influence of NFBC on the basic properties of mortar. The flow test, air content test, [...] Read more.
This study uses two types of nanofibrillated bacterial cellulose (NFBC), a culture solution containing NFBC (Bf) and a purified solution (Pf), to investigate the influence of NFBC on the basic properties of mortar. The flow test, air content test, setting time test, restraint expansion test, dry shrinkage test, strength test and freeze–thaw test were performed. The results show that the flow of fresh mortar increases for Bf and decreases for Pf, while the setting time of mortar is delayed for Bf. The dry shrinkage is slightly decreased as a result of using NFBC in expansive mortar. In addition, for both types of NFBC, the strength is not significantly affected in ordinary mortar, while the compressive strength tends to increase slightly after 28 days of underwater curing in expansive mortar. Moreover, the frost resistance improves as the air content increases in ordinary mortar. In expansive mortar, the frost resistance is improved for Bf, but the frost resistance is not improved for Pf. This investigation has revealed that NFBC can be used as an admixture to improve the properties of mortar, such as frost resistance. Full article
(This article belongs to the Special Issue Application of Nanotechnology in Building Composites)
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13 pages, 3306 KiB  
Article
Investigation of the Effect of Graphene Oxide on the Properties and Microstructure of Clay-Cement Composite Grouting Materials
by Xianzhang Ling, Xiaoyu Guo, Jing Zhong, Jinji Ma, Liang Tang, Dongliang Xing, Jianguang Su and Shengyi Cong
Materials 2022, 15(5), 1623; https://doi.org/10.3390/ma15051623 - 22 Feb 2022
Cited by 10 | Viewed by 2234
Abstract
Reductions in bleeding rates and bulk shrinkage of grouting repair materials comprise the key to solving the leakage of earth–rock dams. In this paper, an anti-seepage grouting material for earth–rock dam was developed by introducing mineral admixtures and graphene oxide (GO) nano sheets [...] Read more.
Reductions in bleeding rates and bulk shrinkage of grouting repair materials comprise the key to solving the leakage of earth–rock dams. In this paper, an anti-seepage grouting material for earth–rock dam was developed by introducing mineral admixtures and graphene oxide (GO) nano sheets into low-cost clay–cement grouting materials and by adding polycarboxylate superplasticizers (PCs) to improve slurry viscosity. The experimental results show that the shear stress and viscosity of the slurry increase with the increase in GO concentration, and the slurry has a certain thixotropy. GO can provide a platform to promote the formation of hydration products and fill the pores of clay particles due to its high specific surface area and low volume; in this paper, the microstructure of clay–cement–graphene oxide (CCGO) grouting materials were improved. Therefore, the bleeding rate, bulk shrinkage rate, setting time and unconfined compressive strength (UCS) of the sample were macroscopically improved. In particular, the bleeding rate and bulk shrinkage rate were shown to be 0% when the content of GO reached 1.08 g/kg. Thus, the grouting anti-seepage and reinforcement performance of CCGO grouting materials were improved. Full article
(This article belongs to the Special Issue Application of Nanotechnology in Building Composites)
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