Investigation of nano-alumina on the effect of durability and micro-structural properties of the cement mortar

Gowda, Raje; Narendra, H.; Nagabushan, B.M.; Rangappa, Dinesh; Prabhakara, R.

doi:10.1016/j.matpr.2017.09.149

Cited by 30 publications

(13 citation statements)

References 6 publications

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“…Thus, the nano-alumina acts as an additive agent for the geopolymeric reaction. Similar behavior was observed by Gowda et al (2016) [15].…”

Section: Setting Timessupporting

confidence: 85%

“…In addition, Stefanidou et al (2017) found that nano-alumina can improve the strength and the density of the geopolymer matrix [11]. Similar results have been observed by Gowda et al (2017) for Portland cement [12]. Using ATR-FTIR spectroscopy, Rees et al (2008) reported that the incorporation of nano-alumina stimulates the formation of nuclei in the geopolymer system and leads to the formation of zeolite Na-F with a edingtonite structure that had not previously been observed in pure geopolymers [13].…”

Section: Introductionsupporting

confidence: 54%

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Synthesis of nano-alumina and their effect on structure, mechanical and thermal properties of geopolymer

Zidi

Ltifi

Ayadi

et al. 2019

Journal of Asian Ceramic Societies

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This paper reports on a study of the effects of nano-alumina on the structural, mechanical and thermal properties of geopolymer matrices. Sample composites were produced by mixing metakaolin, an alkaline solution and nano-alumina (1%, 2% and 3%) with a constant L/S ratio 0.55. The resulting products were investigated by XRD, XRF, FTIR, SEM, MIP, TG/DTA and a compressive strength test. The results showed that the insertion of nano-alumina powder improves geopolymer strength. From FTIR and XRD spectra, we found that the structure and geopolymer gel content were enhanced, especially for the optimized proportion of nano alumina (2%), leading to a more homogenous structure, as shown in SEM images. Thus, the density and water absorption of the nano-alumina geopolymer mixture were improved. The introduction of the nano-alumina also had the effect on the thermal properties of the geopolymers, of increasing the weight loss of the composite.

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“…Thus, the nano-alumina acts as an additive agent for the geopolymeric reaction. Similar behavior was observed by Gowda et al (2016) [15].…”

Section: Setting Timessupporting

confidence: 85%

Section: Introductionsupporting

confidence: 54%

Synthesis of nano-alumina and their effect on structure, mechanical and thermal properties of geopolymer

Zidi

Ltifi

Ayadi

et al. 2019

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

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“…They reported the generation of dense microstructure with larger crystal of portlandite within the cement matrix due to the nano-Al 2 O 3 addition, as shown in Figure 17 and Figure 18. Gowda et al [108] reported the influence of nano-Al 2 O 3 in the water absorption and electrical resistivity of cement mortars. They used 1%, 3% and 5% of nano-Al 2 O 3 by cement weight.…”

Section: Nanomaterials In Cement-based Materialsmentioning

confidence: 99%

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

et al. 2019

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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.

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“…The addition of pozzolanic nanomaterials such as nano-silica and nano-clay decreases the WA (%) by reducing the permeability; this is because they produce calcium hydroxide to form C–S–H gel, which fills up the pores [ 3 , 134 ]. Other nanomaterials, such as nano-titanium and nano-alumina, act as fillers to densify the interfacial transition zone and the microstructure, which consequently reduces the WA (%) [ 93 , 117 , 146 ]. Key observations for different nanomaterials are compiled in Table 2 .…”

Section: Properties and Methodsmentioning

confidence: 99%

“… SEM images of: ( a ) control mortar sample; ( b ) nano-silica added to mortar (taken with permission from Jo et al [ 94 , 107 ]); ( c ) control mortar sample; ( d ) nano-alumina added to mortar [ 105 , 117 ]. …”

Section: Figurementioning

confidence: 99%

Comparative Overview of the Performance of Cementitious and Non-Cementitious Nanomaterials in Mortar at Normal and Elevated Temperatures

et al. 2021

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Nanotechnology has emerged as a field with promising applications in building materials. Nanotechnology-based mortars are examples of such building materials that have widespread applications in the construction industry. The main nanomaterials used in mortars include nano-silica, nano-magnesium oxide, nano-alumina, nano-titanium oxide, nano-zinc oxide, nano-clay, and nano-carbon. This review paper presents a summary of the properties and effects of these nanomaterials on cement mortar in terms of its fresh-state and hard-state properties. The fresh-state properties include the setting time, consistency, and workability, while the hard-state properties include mechanical properties such as compressive, flexural, tensile strengths, as well as the elasticity modulus, in addition to durability properties such as water absorption, shrinkage strain, strength loss due to freeze–thaw cycles, and chloride penetration, among others. Different nanomaterials cause different physical and chemical alterations within the microstructures of cement mortar. Therefore, the microstructural characterization and densification of mortar are discussed in detail at varying temperatures. In general, the involvement of nanomaterials in cement mortar influences the fresh-state properties, enhances the mechanical properties, and impacts the durability properties, while reducing the porosity present in the mortar matrix. Cementitious nanomaterials can create a pathway for the easy injection of binding materials into the internal microstructures of a hydration gel to impact the hydration process at different rates, whereas their non-cementitious counterparts can act as fillers. Furthermore, the research gaps and future outlook regarding the application of nanomaterials in mortar are discussed.

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Investigation of nano-alumina on the effect of durability and micro-structural properties of the cement mortar

Cited by 30 publications

References 6 publications

Synthesis of nano-alumina and their effect on structure, mechanical and thermal properties of geopolymer

Synthesis of nano-alumina and their effect on structure, mechanical and thermal properties of geopolymer

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

Comparative Overview of the Performance of Cementitious and Non-Cementitious Nanomaterials in Mortar at Normal and Elevated Temperatures

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