Effects of nano-SiO2, nano-CaCO3 and nano-TiO2 on properties and microstructure of the high content calcium silicate phase cement (HCSC)

Luan, Congqi; Zhou, Yong; Liu, Yongyi; Ren, Zunchao; Wang, Jinbang; Yuan, Liang; Du, Shuang; Zhou, Zhen; Huang, Yongbo

doi:10.1016/j.conbuildmat.2021.125377

Cited by 53 publications

(23 citation statements)

References 61 publications

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“…The influence of the different contents of NS on the flexural strengths of 50% and 60% fly ash mortar is shown in Figure 5 . The 28-day flexural strength of all the NS-modified mortars is higher than that of the control mortar, which indicates NS can enhance the strength of mortar [ 28 ], and as the NS content increased, the 28-day flexural strength also increased, which is similar to the results in the literature [ 29 ]. Compared to the common 50% fly ash mortar, the 28-day flexural strength of F2–F4 mortar is increased by 54.3–69.4%.…”

Section: Resultssupporting

confidence: 82%

Effect of Nano-SiO2/PVA on Corrosion Behavior of Steel Rebar Embedded in High-Volume Fly Ash Mortar under Accelerated Chloride Attack

Huang

Wang

et al. 2022

Materials

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In this paper, the influence of Nano-silica (NS) and Polyvinyl alcohol (PVA) fibers on the corrosion behavior of steel rebar embedded in high-volume fly ash cement mortars under accelerated chloride attack was studied by using an impressed voltage technique. The PVA fibers used were 1.0 vol.%, and two mass fractions of cement (50 and 60 wt.%) were replaced by fly ash. Four NS mass fractions (0, 0.5, 1.0, and 1.5 wt.%) were utilized in this paper. In addition, the mono and hybrid effects of NS and PVA on the mechanical properties and water absorption of mortar were also studied. The results showed that the incorporation of PVA and nano-SiO2 can improve the flexural and compressive strengths of high-volume fly ash mortar. Generally, the flexural and compressive strengths increased with the increase of nano-SiO2 content. Moreover, the incorporation NS can also reduce the capillary water–absorption rate of cement mortar. The impressed voltage corrosion test indicated that the composite incorporation of nano-SiO2 and PVA can significantly delay the deterioration process of steel bars in mortar, effectively reducing the steel rebar’s corrosion level and increasing the exposure time of the surface crack. With hybrid-incorporation 1.0 vol.% PVA and 1.0 wt.% nano-SiO2, the steel rebar had the lowest corrosion degree, which exhibited a mass loss of 49% and increased the broken time by 71% as compared to the control mortar.

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Section: Resultssupporting

confidence: 82%

Effect of Nano-SiO2/PVA on Corrosion Behavior of Steel Rebar Embedded in High-Volume Fly Ash Mortar under Accelerated Chloride Attack

Huang

Wang

et al. 2022

Materials

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“…The appearance of this phase in abundance was a strong turning point in the mechanical properties of the D45-T5 composite. The studies of Lee and Kurtis, 2010 and Luan et al, 2022 demonstrated that the addition of TiO 2 NPs affected positively the early hydration of C 3 S and created more nucleation sites [81,82].…”

Section: Phases Identification 331 X-ray Diffraction (Xrd)mentioning

confidence: 99%

De-aluminated metakaolin-cement composite modified with commercial titania as a new green building material for gamma-ray shielding applications

Ramadan

Kohail²,

Abadel³

et al. 2022

Case Studies in Construction Materials

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“…The optimum dosages of 3–4% NC were obtained, and 2% and 3% of NS and NC, respectively, influenced the heat of hydration and compressive strength of the cementitious material. The addition of 2% NS had the most significant effect on the mechanical properties of the concrete [ 79 ]. The mechanical properties of concrete such as compressive strength, flexural strength and splitting strength were improved by mixing NC alone or by combining NS and NC.…”

Section: The Effect Of Nano-sio 2 and Nano-caco ...mentioning

confidence: 99%

Concrete Performance Attenuation of Mix Nano-SiO2 and Nano-CaCO3 under High Temperature: A Comprehensive Review

Syamsunur

Memon

et al. 2022

Materials

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Fire and extreme heat environmental changes can have an impact on concrete performance, and as climate change increases, new concrete structures are being developed. Nano-silica and nano-calcium carbonate have shown excellent performances in modifying concrete due to their large specific surface areas. This review describes the changes in concrete modified with nano-silica (NS) and nano-calcium carbonate (NC), which accelerate the hydration reaction with the cementitious materials to produce more C-S-H, resulting in a denser microstructure and improved mechanical properties and durability of the concrete. The mechanical property decay and visualization of deformation of mixed NS and NC concrete were tested by exposure to high temperatures to investigate the practical application of mixed composite nanomaterials (NC+NS) to concrete. The nano-modified concrete had better overall properties and was heated at 200 °C, 400 °C, 600 °C and 800 °C to relatively improve the mechanical properties of the nano concrete structures. The review concluded that high temperatures of 800 °C to 1000 °C severely damaged the structure of the concrete, reducing the mechanical properties by around 60%, and the dense nano concrete structures were more susceptible to cracking and damage. The high temperature resistance of NS and NC-modified nano concrete was relatively higher than that of normal concrete, with NC concrete being more resistant to damage at high temperatures than the NS samples.

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Effects of nano-SiO2, nano-CaCO3 and nano-TiO2 on properties and microstructure of the high content calcium silicate phase cement (HCSC)

Cited by 53 publications

References 61 publications

Effect of Nano-SiO2/PVA on Corrosion Behavior of Steel Rebar Embedded in High-Volume Fly Ash Mortar under Accelerated Chloride Attack

Effect of Nano-SiO2/PVA on Corrosion Behavior of Steel Rebar Embedded in High-Volume Fly Ash Mortar under Accelerated Chloride Attack

De-aluminated metakaolin-cement composite modified with commercial titania as a new green building material for gamma-ray shielding applications

Concrete Performance Attenuation of Mix Nano-SiO2 and Nano-CaCO3 under High Temperature: A Comprehensive Review

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