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Shear Behavior of Recycled Fine Aggregate Reinforced by Nano-MgO Modified Cement
Ting Zhu1,2, Yitong Shou1, Xiaoqing Chen3
1School of Civil Engineering, Shaoxing University, Shaoxing 312000, China.
Materials (Basel, Switzerland)
|October 27, 2022
Summary
Adding nano-MgO to cement-reinforced recycled fine aggregate (CRA) significantly enhances its mechanical strength. This improvement in CRA is attributed to increased cohesion and friction angle, boosting both direct and triaxial shear strength.
Area of Science:
- Materials Science
- Geotechnical Engineering
- Civil Engineering
Background:
- Recycled fine aggregate (CRA) is a sustainable construction material.
- Improving the mechanical properties of CRA is crucial for its wider application.
- Nano-magnesium oxide (nano-MgO) is a potential additive for material modification.
Purpose of the Study:
- To investigate the effect of nano-MgO on the mechanical properties of cement-reinforced recycled fine aggregate (CRA).
- To quantify the changes in shear strength parameters (cohesion and friction angle) of modified CRA.
Main Methods:
- Direct shear tests and triaxial shear tests were performed on cement-reinforced recycled fine aggregate (CRA) modified with varying contents of nano-MgO (0% to 2.0%).
- Cement content was fixed at 2% for all tested samples.
Main Results:
- Nano-MgO addition significantly increased both direct shear strength and triaxial shear strength of MCRA.
- The increase in direct shear strength was primarily due to enhanced cohesion.
- The increase in triaxial shear strength resulted from simultaneous increases in cohesion and friction angle.
Conclusions:
- Nano-MgO effectively enhances the mechanical performance of cement-reinforced recycled fine aggregate.
- The study provides valuable insights into optimizing the use of nano-MgO for improving geotechnical material properties.
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