Use of nano-silica sol in concrete: Performance and influence mechanisms

Chen, J.J.; Ng, P.L.; Xu, L.; Kwan, A.K.H.

doi:10.1016/j.conbuildmat.2023.134582

Cited by 8 publications

(1 citation statement)

References 47 publications

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“…Compared with traditional cement slurry, ultrafine cement slurry has the advantages of smaller particles, less sedimentation, a larger surface area, and a smaller particle size [24,25]. Nano-silica sol, created by uniformly dispersing nanoscale silica in water, undergoes gel formation upon mixing with cementitious materials [26]. This sol has the advantages of low initial viscosity, controllable gel time, and suitability for grouting engineering applications.…”

Section: Inorganic Grouting Materialsmentioning

confidence: 99%

A State-of-the-Art Review on the Study of the Diffusion Mechanism of Fissure Grouting

Du,

Li,

Fang

et al. 2024

Applied Sciences

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China is renowned for its extensive underground engineering projects and the complex geological and hydrological conditions it faces. Grouting treatment technology is widely employed in deep-buried mines and tunnels, where grouting parameters such as materials, pressure, volume, and hole arrangement significantly impact the effectiveness of grouting. This review paper comprehensively examines current research on grouting materials, theories, experiments, and numerical simulations. It summarizes the various factors that must be considered during the grouting process of fissures and explores the diffusion mechanisms of grout under their influence. Furthermore, further research is needed on the mechanisms and treatment methods for poor grouting in rock masses, the distribution patterns of fissures, optimization methods for grouting parameters, and grout quality assessment techniques. Future research should focus on developing more efficient experimental methods with higher accuracy levels while advancing grouting technologies. Establishing comprehensive and accurate rock mass models along with improving monitoring capabilities are also crucial aspects to consider. Therefore, studying the diffusion mechanisms of grout in fissured rock masses is of significant importance for the practical operation of underground engineering projects.

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Section: Inorganic Grouting Materialsmentioning

confidence: 99%

A State-of-the-Art Review on the Study of the Diffusion Mechanism of Fissure Grouting

Du,

Li,

Fang

et al. 2024

Applied Sciences

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Effect of nano‐silica on the mechanical performance and porosity evolution of concrete under freezing and thawing cycles

Yang,

Xiao,

Ming

2024

Structural Concrete

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The enhancement of freeze–thaw resistance in concrete is crucial for improving the durability and longevity of infrastructure in cold regions. Although the benefits of nano‐silica (NS) on concrete's freeze–thaw resistance have been demonstrated, there is still controversy surrounding the optimal concentration of admixture and underlying mechanisms. In this study, the mechanical performance (mass weight, elastic modulus, compressive and splitting strength) and porosity evolution (total porosity, porosity distribution and micro‐surface morphologies) of control concrete and concrete modified with five different NS admixture concentration (1%–5%) were tested under freezing and thawing (F–T) cycles, and damage models were established to assess the correlations between macroscopic and microscopic damages. The results indicate that F–T cycles lead to both damage in mechanic properties and porosity in concrete specimens. The effects of NS particles on macroscopic and microscopic damage under F–T conditions depend on their admixture concentration. A 2% concentration mitigates while a 5% dosage promotes both macroscopic and microscopic damages during F–T cycles. These differences can primarily be attributed to different dispersion status of NS particles in concrete, leading to variations in porosity evolution during F–T cycles. The macroscopic damage exhibit stronger correlation with microscopic damage factor modified by proportion of large pores compared to that only based on total porosity, suggest that the microscopic damage, especially large pores' proportion, contribute to macroscopic damage of concrete specimens under F–T cycles. These findings provide valuable references for field concrete engineering applications in cold areas.

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Investigation on the properties of sustainable alkali-activated GGBS mortar with nano silica and dredged marine sand: Mechanical, microstructural and durability aspects

A.,

O.M.

2024

Case Studies in Construction Materials

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Use of nano-silica sol in concrete: Performance and influence mechanisms

Cited by 8 publications

References 47 publications

A State-of-the-Art Review on the Study of the Diffusion Mechanism of Fissure Grouting

A State-of-the-Art Review on the Study of the Diffusion Mechanism of Fissure Grouting

Effect of nano‐silica on the mechanical performance and porosity evolution of concrete under freezing and thawing cycles

Investigation on the properties of sustainable alkali-activated GGBS mortar with nano silica and dredged marine sand: Mechanical, microstructural and durability aspects

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