Study on the Influence and Performance of Nano SiO₂ on Solid Waste Grouting Material

Area of Science:

• Civil Engineering
• Materials Science
• Sustainable Construction

Background:

• Grouted sleeve connections are vital for prefabricated buildings, offshore wind power, and bridges.
• Conventional cement-based grouts pose environmental challenges.
• There is a need for sustainable, high-performance grouting materials.

Purpose of the Study:

• To develop an eco-friendly grouting material using industrial solid waste.
• To investigate the effect of nanosilica (NS) on the performance of supplementary cementitious material-based grout.
• To evaluate the mechanical properties and microstructural characteristics of the developed grout.

Main Methods:

• Developed a grout using silica fume (15%) and fly ash (5%) as supplementary cementitious materials.
• Incorporated varying amounts of nanosilica (NS) to optimize grout properties.
• Conducted mechanical tests (compressive strength) and microstructural characterization.
• Performed half-grouted sleeve uniaxial tensile tests to assess connection performance.

Main Results:

• Nanosilica (NS) accelerated the hydration of silica fume and fly ash.
• An optimal NS dosage of 0.4% resulted in a 37.9% increase in 28-day compressive strength (105.5 MPa).
• Specimens with NS showed reinforcement necking failure in tensile tests, indicating cooperative load-bearing between grout and sleeve.

Conclusions:

• Nanosilica enhances the performance of eco-friendly grouts made with industrial waste.
• The developed grout offers high strength and improved load-bearing behavior for sustainable civil infrastructure.
• Findings support the use of low-impact, high-performance grouting materials in engineering applications.