Properties of cement-based composites using nanoparticles: A comprehensive review

Paul, Suvash Chandra; Rooyen, Algurnon S. van; Zijl, Gideon van; Petrik, Leslie

doi:10.1016/j.conbuildmat.2018.09.062

Cited by 167 publications

(61 citation statements)

References 93 publications

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“…Unlike the second hydration behaviors of pozzolanic materials such as fly ash, slag, silica, metakaolin, etc. [36], only the above-mentioned aluminate hydrates would be formed during the hydration of C 12 A 7 . These aluminate hydrates could further react with gypsum or AFt to produce AFm, leading to a reduction of AFt/AFm ratio in hydrate assemblages.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Mayenite Employed as a Functional Component on Hydration Properties of Ordinary Portland Cement

2018

Materials

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Influence of C12A7 (12CaO·7Al2O3) as a functional component on hydration properties of Ordinary Portland Cement is studied using isothermal microcalorimetric technique, X-ray diffraction analysis, and thermodynamic calculation. Meanwhile, hydrate assemblages are simulated by hydrothermal software. C2AH8 (2CaO·Al2O3·8H2O) is generated as a transition phase during the hydration of pure C12A7, while formation of CAH10 (CaO·Al2O3·10H2O) is uncertain. Heat-releasing behavior of Ordinary Portland Cement (OPC) could be noticeably affected by C12A7, especially for the duration of interaction at boundary stage reduces with C12A7 replacement. Correspondingly, all hydration kinetic parameters first increase and then diminish with C12A7 replacement. Simulation results manifest in the main hydration products of OPC being ettringite, C-S-H (Calcium-Silicate-Hydrate) gel, portlandite and brucite. Increasing C12A7 replacement accelerates the consumption rates of gypsum and calcite that are typically included in OPC, and thus the ettringite content is changed and carbonate phases will be produced. Therefore, the microstructure properties of hydrated products of OPC are affected and the compressive strength is influenced. These predications are in good agreement with experimental findings. C12A7 can be used as a functional component to adjust the consumption rate of suphates in OPC, and also components of carbonate phases can be modified in hydrate assemblage.

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Section: Resultsmentioning

confidence: 99%

The Influence of Mayenite Employed as a Functional Component on Hydration Properties of Ordinary Portland Cement

2018

Materials

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“…Numerous nano-particles (SiO 2 , Al 2 O 3 and TiO 2 ) have been successfully used as improvement agent in terms of mechanical properties, microstructure as well as durability of binder, mortar and concretes [8]. Titanium dioxide, which is one of the mostly used, exhibits three polymorphs namely anatase, rutile and brookite.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural properties of geopolymer mortars from meta-halloysite: effect of titanium dioxide TiO2 (anatase and rutile) content

et al. 2020

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This study aimed to investigate the effect of Titanium Dioxide TiO 2 (anatase and rutile) on mechanical and microstructural properties of meta-halloysite based geopolymer mortars namely GMHA and GMHR series. Meta-halloysite received 2.5, 5.0, 7.5 and 10 wt% of anatase or rutile as addition before calcination and geopolymerization. The raw materials and the end products were characterized using XRD, FTIR, ESEM and MIP analyses. The flexural strength increases from 6.90 to 9.13 MPa and from 6.90 to 12.33 MPa for GMHA and GMHR series respectively. The cumulative pore volume decreases from 102.2 to 84.2 mm 3 g −1 and from 102.2 to 51.3 mm 3 g −1 for GMHA and GMHR products respectively. Both matrices present micrographs with very low capillaries pores and fractured surfaces that confirmed the enhancement of the mechanical properties. It was concluded that TiO 2 in both forms is beneficial for the reduction of porosity and densification of geopolymer matrices. Rutile enabled more compact and denser geopolymer structure compared to anatase. The aforementioned results showed the efficiency of both fine TiO 2 particles to improve the geopolymer network significant for its durability.

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“…However, the total reaction degree of FA and NS could be calculated, as shown in equation 7. It was reported that most of NS was depleted at the early age [43]. Based on this, A (FA+NS) could reflect the pozzolanic reaction of FA:…”

Section: Nmrmentioning

confidence: 80%

Effect of Nanosilica on Impermeability of Cement‐Fly Ash System

Liu

Zhang

Tong

et al. 2020

Advances in Civil Engineering

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Surface protection has been accepted as an effective way to improve the durability of concrete. In this study, nanosilica (NS) was used to improve the impermeability of cement-fly ash system and this kind of material was expected to be applied as surface protection material (SPM) for concrete. Binders composed of 70% cement and 30% fly ash (FA) were designed and nanosilica (NS, 0–4% of the binder) was added. Pore structure of the paste samples was evaluated by MIP and the fractal dimension of the pore structure was also discussed. Hydrates were investigated by XRD, SEM, and TG; the microstructure of hydrates was analyzed with SEM-EDS. The results showed that in the C-FA-NS system, NS accelerated the whole hydration of the cement-FA system. Cement hydration was accelerated by adding NS, and probably, the pozzolanic reaction of FA was slightly hastened because NS not only consumed calcium hydroxide by the pozzolanic reaction to induce the cement hydration but also acted as nucleation seed to induce the formation of C-S-H gel. NS obviously refined the pore structure, increased the complexity of the pore structure, and improved the microstructure, thereby significantly improving the impermeability of the cement-FA system. This kind of materials would be expected to be used as SPM; the interface performance between SPM and matrix, such as shrinkage and bond strength, and how to cast it onto the surface of matrix should be carefully considered.

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Properties of cement-based composites using nanoparticles: A comprehensive review

Cited by 167 publications

References 93 publications

The Influence of Mayenite Employed as a Functional Component on Hydration Properties of Ordinary Portland Cement

The Influence of Mayenite Employed as a Functional Component on Hydration Properties of Ordinary Portland Cement

Mechanical and microstructural properties of geopolymer mortars from meta-halloysite: effect of titanium dioxide TiO2 (anatase and rutile) content

Effect of Nanosilica on Impermeability of Cement‐Fly Ash System

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