Study on the Binary Hydraulic Kinetics Model of Glass Powder-Cement: Numerical Simulation

Area of Science:

• Materials Science
• Civil Engineering
• Chemical Engineering

Background:

• Glass powder is a common supplementary cementitious material in concrete.
• Previous research focused on mechanical properties, lacking hydration kinetics models for glass powder-cement systems.

Purpose of the Study:

• To establish a theoretical model for the binary hydration kinetics of glass powder-cement.
• To investigate the influence of glass powder on cement hydration processes.

Main Methods:

• Developed a theoretical model based on the pozzolanic reaction mechanism of glass powder.
• Simulated hydration using the finite element method (FEM) for various glass powder contents (0%, 20%, 50%).
• Validated the model against experimental hydration heat data.

Main Results:

• The model accurately predicted cement hydration, confirming glass powder dilutes and accelerates hydration.
• Higher glass powder content (50%) reduced glass powder hydration degree by 42.3% compared to 5% content.
• Glass powder reactivity decreased exponentially with particle size, stabilizing above 90 μm.
• Increased replacement rate reduced glass powder reactivity; CH concentration peaked early with >45% replacement.

Conclusions:

• The study provides a reliable hydration kinetics model for glass powder-cement.
• Findings elucidate glass powder's hydration mechanism and its impact on cementitious materials.
• Offers a theoretical foundation for optimizing glass powder utilization in concrete applications.