Nano-silica and silica fume modified cement mortar used as Surface Protection Material to enhance the impermeability

Zhang, Bingliu; Tan, Hongbo; Shen, Weiguo; Xu, Guangyou; Ma, Baoguo; Ji, Xiaoli

doi:10.1016/j.cemconcomp.2018.05.012

Cited by 224 publications

(53 citation statements)

References 33 publications

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“…Surface protection materials can be prepared by using nano-SiO 2 and silica fume modified mortar. When this material is coated on the concrete surface, the concrete shows good impermeability [7]. Nano-silica particles are also valuable in enhancing the strength of mortar, because nano-SiO 2 can not only fill the pores in the matrix, but also act as an activator to promote pozzolan reaction [8].…”

Section: Introductionmentioning

confidence: 99%

The effect of nano-SiO2 on concrete properties: a review

Zhuang

Chen

2019

Nanotechnology Reviews

123

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In recent years, the addition of nanometer materials to concrete materials has attracted a group of increasing number of scholars’ research interests, and nano-SiO2 is one of the research hotspots. In this paper, we briefly introduce the influence of nano-SiO2 on setting time, slump, shrinkage, durability and mechanical properties of concrete. In addition, this review also includes the microstructure measured by scanning electron microscope (SEM) and the content of various hydration products obtained by X-ray diffraction (XRD). The result shows that the setting time of nano-SiO2 concrete is shortened, the slump is reduced and the shrinkage is improved owing to the high activity and nucleation of nano-SiO2. The improvement effect of nano-SiO2 on concrete is remarkable, especially in the aspect of enhancing the durability of concrete. It should be noted that nano-SiO2 shows limited improvement in the mechanical properties of concrete. In the end, this literature summary explains the macro performance of nano-silica modified concrete through microstructure.

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Section: Introductionmentioning

confidence: 99%

The effect of nano-SiO2 on concrete properties: a review

Zhuang

Chen

2019

Nanotechnology Reviews

123

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“…Chloride diffusion coefficient (D RCM ) of the C-FA-NS system was examined, and the results are shown in Figure 3. From the figure, it was seen [8,22]. It is generally believed that the impermeability of cement-based material is related to the pore structure and microstructure [50].…”

Section: Resultsmentioning

confidence: 91%

“…Furthermore, another kind of SPM was coated as a layer on the surface of the matrix. Zhang reported that cement mortar modified with nanosilica (NS) and silica fume could be used as SPM to enhance the impermeability [22]. e reason was revealed that NS and silica fume not only consumed CH to form the dense C-S-H but also exerted the excellent filling effect, thereby declining the porosity, increasing density, improving the microstructure including interfacial transition zone (ITZ), and enhancing the mechanical performance [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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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“…Compared with the DTA-TG atlas, it can be seen that the endothermic peak around 100°C is due to the evaporation of the free water and the dehydration of C-S-H and AFt; the second one located at 460°C is attributed to Ca(OH) 2 ; and the third one at 680°C is caused by the decomposition of CaCO 3 which is due to the carbonization of CH in the process of preparing the samples. So, the following equation [20] can be used to calculate Ca(OH) 2 content:…”

Section: Hydration Heatmentioning

confidence: 99%

Effect of Delaminated MXene (Ti₃C₂) on the Performance of Cement Paste

Zhu

Gen-shen

Chen

et al. 2019

Journal of Nanomaterials

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Delaminated MXene was incorporated into cement to improve the properties of cement composites, and its effects on the hydration process, microstructures, and mechanical properties were investigated, respectively. The investigation results showed that delaminated MXene was well-dispersed in the cement matrix and significantly reinforced the compressive strength of cement, especially when the addition is 0.01 wt%. Meanwhile, the total hydration heat of cement hydration and the quantity of hydration products were increased with the addition of delaminated MXene. In addition, the formation of HD C-S-H gel was promoted, and the microstructure of hydrated cement became more compact.

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Nano-silica and silica fume modified cement mortar used as Surface Protection Material to enhance the impermeability

Cited by 224 publications

References 33 publications

The effect of nano-SiO2 on concrete properties: a review

The effect of nano-SiO2 on concrete properties: a review

Effect of Nanosilica on Impermeability of Cement‐Fly Ash System

Effect of Delaminated MXene (Ti₃C₂) on the Performance of Cement Paste

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Nano-silica and silica fume modified cement mortar used as Surface Protection Material to enhance the impermeability

Cited by 224 publications

References 33 publications

The effect of nano-SiO2 on concrete properties: a review

The effect of nano-SiO2 on concrete properties: a review

Effect of Nanosilica on Impermeability of Cement‐Fly Ash System

Effect of Delaminated MXene (Ti3C2) on the Performance of Cement Paste

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Effect of Delaminated MXene (Ti₃C₂) on the Performance of Cement Paste