Micromechanical damage analysis and engineering performance of concrete with colloidal nano-silica and demolished concrete aggregates

Erdem, Savaş; Hanbay, Serap; Güler, Zeynel

doi:10.1016/j.conbuildmat.2018.03.197

Cited by 49 publications

(11 citation statements)

References 30 publications

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“…The proportion of portlandite-Ca(OH) 2 in cementitious materials decreases when NS combines with Ca(OH) 2 to generate a denser product [54]. Some previous studies have indicated that substituting NS for up to 4% of the cement in concrete can enhance its mechanical strength and durability under adverse circumstances such as elevated temperatures and corrosion [55,56]. Though various researchers have confirmed the use of NS for particular applications of cementitious materials, it has been shown to be highly successful when utilized in a 0.5 to 4% proportion as a cement substitution.…”

Section: Introductionmentioning

confidence: 99%

Nano-Silica-Modified Concrete: A Bibliographic Analysis and Comprehensive Review of Material Properties

et al. 2022

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Several review studies have been performed on nano-silica-modified concrete, but this study adopted a new method based on scientometric analysis for the keywords’ assessment in the current research area. A scientometric analysis can deal with vast bibliometric data using a software tool to evaluate the diverse features of the literature. Typical review studies are limited in their ability to comprehensively and accurately link divergent areas of the literature. Based on the analysis of keywords, this study highlighted and described the most significant segments in the research of nano-silica-modified concrete. The challenges associated with using nano-silica were identified, and future research is directed. Moreover, prediction models were developed using data from the literature for the strength estimation of nano-silica-modified concrete. It was noted that the application of nano-silica in cement-based composites is beneficial when used up to an optimal dosage of 2–3% due to high pozzolanic reactivity and a filler effect, whereas a higher dosage of nano-silica has a detrimental influence due to the increased porosity and microcracking caused by the agglomeration of nano-silica particles. The mechanical strength might enhance by 20–25% when NS is incorporated in the optimal amount. The prediction models developed for predicting the strength of nano-silica-modified concrete exhibited good agreement with experimental data due to lower error values. This type of analysis may be used to estimate the essential properties of a material, therefore saving time and money on experimental tests. It is recommended to investigate cost-effective methods for the dispersion of nano-silica in higher concentrations in cement mixes; further in-depth studies are required to develop more accurate prediction models to predict nano-silica-modified concrete properties.

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Section: Introductionmentioning

confidence: 99%

Nano-Silica-Modified Concrete: A Bibliographic Analysis and Comprehensive Review of Material Properties

et al. 2022

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“…Similar behavior is observed for flexural strength, where a slight increase in strength is observed for NS samples when compared with 0NS. Erdem et al [12] found at 28 days that the incorporation of 0.5% to 1.5% of NS in concretes with recycled aggregate increased the mechanical properties with the increase in the NS content. NS enabled an increase in the hydration rate of the cement paste (high Ca/Si ratio at the interface) and in the reactions of pozzolanic activity, constituting a strong connection between the cement mortar and the aggregates.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…A recent work that evaluated the performance of NS in concrete with recycled coarse aggregate [12] showed that with 0.5% incorporation of NS a reduction of 14% in compressive strength, 10% in flexural strength, and 37% in elasticity modulus when compared with the mixture with natural aggregate (NA). However, with 1.5% NS, the increase in compressive and flexural strength for mixtures with RCA was 6% and 4%, respectively, in relation to NA.…”

Section: Introductionmentioning

confidence: 99%

“…However, with 1.5% NS, the increase in compressive and flexural strength for mixtures with RCA was 6% and 4%, respectively, in relation to NA. This is due to the pozzolanic activity reactions and the acceleration of the cement paste hydration rate, resulting in a stronger bond between paste-aggregate [12]. Tobón et al [21] produced mortars with cement substitutions for NS (up to 10%) and added SP for the correction of fluidity.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the effect of nanosilica and recycled fine aggregate in Portland cement rendering mortars

Lima

Zaleski

Júnior

et al. 2022

Rev. IBRACON Estrut. Mater.

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This paper evaluated the incorporation of nanosilica (NS) in rendering mortars produced with recycled fine aggregate (RFA). Initially, a study was carried out on cementitious pastes, replacing Portland cement with NS at levels of 0%, 0.4%, 0.6%, 0.8%, and 1.0%. The samples were submitted to scattering, rheology, calorimetry, x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and compressive strength analysis at 28 days. The results demonstrated that the pastes with 0.4% NS and 0.6% NS presented an increase in strength of 55% and 58%, respectively, due to a greater formation of calcium silicate hydrate (C-S-H), when compared with the reference paste. From that, the RFA samples were produced, replacing Portland cement with 0% NS, 0.4% NS, and 0.6% NS. At 28 days, mechanical performance, microstructure, and durability were evaluated by means of flexural strength and compression, scanning electron microscopy (SEM), dynamic elasticity module, and water absorption by capillarity. From the results, it was concluded that the RFA samples with 0.4% NS resulted in the optimal nanosilica content, increasing compressive strength values and reducing the sorptivity, in relation to the other mixtures. The SEM images suggest that NS reacted with portlandite formed of the cement hydration, improving the microstructural development of the samples.

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“…Mukharjee et al [ 18 ] have incorporated 3% nano-silica (NS) in RC, and the increasing ratio of compressive strength was found to be 18%. Other researchers have also used NS to improve the microstructure as well as the macroscopic mechanical properties of RC [ 19 , 20 , 21 ]. The microbial carbonate precipitation method was also suggested by Qiu et al [ 22 ] to enhance the properties of RCA.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance and Constitutive Model Analysis of Concrete Using PE Fiber-Strengthened Recycled Coarse Aggregate

Zhou

Guan

et al. 2022

Polymers

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To promote the sustainable development of the construction industry, concrete incorporating polyethylene (PE) fiber-strengthened recycled coarse aggregate (SRCA) and seawater and sea sand (SWSS) is prepared. The usage of SRCA significantly improves the mechanical performance of concrete. The strength is improved, and the failure mode of concrete cylinders is also remarkably altered. The incorporation of SWSS that alleviates the shortage of freshwater and river sand slightly reduces the mechanical strength of concrete at 28 and 90 days, while the replacement of cement by 35% limestone calcined clay cement (LC3) overcomes this drawback. The compressive strength of concrete is further enhanced, and the pore structure is refined. The introduction of LC3 also promotes the formation of Friedel’s salt, which could improve the chloride binding capacity of concrete using SWSS. Furthermore, the stress-strain relationship of sustainable concrete is analyzed, and the experimental results are compared with the commonly used constitutive models. The predictive constitutive models are proposed to effectively describe the mechanical performance of sustainable concrete.

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Micromechanical damage analysis and engineering performance of concrete with colloidal nano-silica and demolished concrete aggregates

Cited by 49 publications

References 30 publications

Nano-Silica-Modified Concrete: A Bibliographic Analysis and Comprehensive Review of Material Properties

Nano-Silica-Modified Concrete: A Bibliographic Analysis and Comprehensive Review of Material Properties

Evaluation of the effect of nanosilica and recycled fine aggregate in Portland cement rendering mortars

Mechanical Performance and Constitutive Model Analysis of Concrete Using PE Fiber-Strengthened Recycled Coarse Aggregate

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