Effect of Nano-SiO2 on the Microstructure and Mechanical Properties of Concrete under High Temperature Conditions

Brzozowski, P.; Strzałkowski, Jarosław; Rychtowski, Piotr; Tryba, Beata; Horszczaruk, Elżbieta

doi:10.3390/ma15010166

Cited by 18 publications

(7 citation statements)

References 53 publications

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“…The use of liquid nanomaterials, meaning as mixing water with micro-nano bubbles, is quite a novel approach in the recent scientific research [33,36,83,84]. Most of the scientists used nanomaterials in the solid form [85][86][87] or colloids [40,[87][88][89][90][91]. In a paper where the impact of hydrogen micro-nano bubbles on the microstructure of cement-based material were investigated (e.g., [34]), the authors observed a significant change in pore size distribution, which did not occur in the case of the presented results for micro-nano oxygen and ozone bubbles.…”

Section: Resultsmentioning

confidence: 99%

Influence of Water with Oxygen and Ozone Micro-Nano Bubbles on Concrete Physical Properties

et al. 2022

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In this study, the possibility of using mixing water containing O2 and O3 micro-nano bubbles (M-NBs) in concrete technology was investigated. In particular, the effect of micro-nano bubbles on the durability and frost resistance of concrete was analyzed. Concretes with two types of micro-nano bubbles were studied. The physical properties of both the modified concretes and the reference concrete were determined, i.e., specific and apparent density, porosity, weight absorption and coefficient of water absorption. Mechanical parameters based on compressive and flexural strength were tested after 14 and 28 days of curing. Concrete durability was determined on the basis of frost resistance and resistance to salt crystallization. The pore distribution in the cement matrix was determined based on porosimetry studies. The use of water with micro-nano bubbles of O2 and O3, among others, contributed to a reduction in the water absorption coefficient from 42.7% to 52.3%, in comparison to the reference concrete. The strength characterizing the concrete with O3 increased by 61% after 28 days, and the frost resistance after 150 F-T cycles increased by 2.4 times. Resistance to salt crystallization improved by 11% when water with O3 was used.

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Section: Resultsmentioning

confidence: 99%

Influence of Water with Oxygen and Ozone Micro-Nano Bubbles on Concrete Physical Properties

et al. 2022

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“…Figure 7 shows the compressive and tensile strength losses of concrete at 600 °C. Brzozowski et al [68] reported that the thermal resistance enhancement with nanosilica was attributed to its thermal characteristics as well as the cement paste porosity structure when they used a method that was good at dispersing the nanoparticles in Brzozowski et al [68] reported that the thermal resistance enhancement with nanosilica was attributed to its thermal characteristics as well as the cement paste porosity structure when they used a method that was good at dispersing the nanoparticles in concrete. It was reported that the 0.3-300 m diameter pores were reduced with nanosilica particles, which also limited the microcracks and strengthened the ITZ zone.…”

Section: Residual Mechanical Strength Improvements With Nanomaterialsmentioning

confidence: 99%

An Elucidative Review of the Nanomaterial Effect on the Durability and Calcium-Silicate-Hydrate (C-S-H) Gel Development of Concrete

Al-saffar,

Wong,

Paul

2023

Gels

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Concrete as a building material is susceptible to degradation by environmental threats such as thermal diffusion, acid and sulphate infiltration, and chloride penetration. Hence, the inclusion of nanomaterials in concrete has a positive effect in terms of promoting its mechanical strength and durability performance, as well as resulting in energy savings due to reduced cement consumption in concrete production. This review article discussed the novel advances in research regarding C-S-H gel promotion and concrete durability improvement using nanomaterials. Basically, this review deals with topics relevant to the influence of nanomaterials on concrete’s resistance to heat, acid, sulphate, chlorides, and wear deterioration, as well as the impact on concrete microstructure and chemical bonding. The significance of this review is a critical discussion on the cementation mechanism of nanoparticles in enhancing durability properties owing to their nanofiller effect, pozzolanic reactivity, and nucleation effect. The utilization of nanoparticles enhanced the hydrolysis of cement, leading to a rise in the production of C-S-H gel. Consequently, this improvement in concrete microstructure led to a reduction in the number of capillary pores and pore connectivity, thereby improving the concrete’s water resistance. Microstructural and chemical evidence obtained using SEM and XRD indicated that nanomaterials facilitated the formation of cement gel either by reacting pozzolanically with portlandite to generate more C-S-H gel or by functioning as nucleation sites. Due to an increased rate of C-S-H gel formation, concrete enhanced with nanoparticles exhibited greater durability against heat damage, external attack by acids and sulphates, chloride diffusion, and surface abrasion. The durability improvement following nanomaterial incorporation into concrete can be summarised as enhanced residual mechanical strength, reduced concrete mass loss, reduced diffusion coefficients for thermal and chloride, improved performance against sulphates and acid attack, and increased surface resistance to abrasion.

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“…Based on the results, an ideal nano-SiO2 content improved the thermal resistance. Brzozowsk et al [20] found that nanoparticles enhanced the behavior of concrete at high temperatures in cement mortar containing quartz and magnetite aggregates. Researchers [21][22][23][24] found that adding 4% of nano-SiO2 by replacing it with cement improved compressive strength, and whenever it exceeded 4%, its positive effect decreased.…”

Section: Introductionmentioning

confidence: 99%

The Post-fire Behavior of Lightweight Structural Concrete is Improved by Nano-SiO2 and Steel Fibers

Altalib,

Tavakoli,

Hashemi

2023

IJE

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The primary goal of the engineering design of building is to reduce the weight of the structure and its resistance to fires and earthquakes because fires are inevitable. Hence, the direction of this study was to use lightweight concrete because of its unique advantages in weight loss and fire resistance due to its thermal insulation property. It was also intended to enhance the strength and behavior of this concrete at high temperatures. For this purpose, four mixing designs samples without fibers and nano-SiO2, samples with different proportions of nano-SiO2, samples with different proportions of fibers, and samples with both fibers and nano-SiO2 together were prepared. The results showed damage to samples free of nano-SiO2 and fibers, changing their color, reducing their resistance and reducing their weight. But adding nano-SiO2 fibers or using them together leads to improving the properties of concrete at all temperatures. Due to nano-SiO2, its pozzolanic interactions improve the microstructure, and the fibers prevent cracks in concrete. This study also dealt with the effect of changing the size of the samples on the compressive strength, and the results showed an increase in the resistance of the samples with small sizes, and resulted factors for converting the resistance of non-standard samples into a standard.

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Effect of Nano-SiO2 on the Microstructure and Mechanical Properties of Concrete under High Temperature Conditions

Cited by 18 publications

References 53 publications

Influence of Water with Oxygen and Ozone Micro-Nano Bubbles on Concrete Physical Properties

Influence of Water with Oxygen and Ozone Micro-Nano Bubbles on Concrete Physical Properties

An Elucidative Review of the Nanomaterial Effect on the Durability and Calcium-Silicate-Hydrate (C-S-H) Gel Development of Concrete

The Post-fire Behavior of Lightweight Structural Concrete is Improved by Nano-SiO2 and Steel Fibers

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