About this Engineering article
Mechanical Properties and Microstructure of Nano-strengthened Recycled Aggregate Concrete by Yuanxun Zheng; Yahui Zhang; Jingbo Zhuo; Peng Zhang; Weixing Kong is a Engineering article available to read on EtoBox.
The surface adhesion mortar of recycled coarse aggregate (RCA) is the main factor leading to poor aggregate quality, and it also affects the internal structure and mechanical properties of recycled aggregate concrete (RAC). To improve the quality of RCA and mechanical properties of RAC, self-developed mortar removal equipment was used to strengthen the RCA. Then, the RCA was soaked in 1, 2, and 3% nano-silica solutions, and the vibration-mixing process was used to improve the quality of RAC. In addition, the microstructure of the RAC was examined via scanning electron microscopy to observe its improvement effect on the microstructure of the RAC. The results indicated that the quality of the RCA was improved by mechanical and physical strengthening, and the waterabsorption rate and crushing value decreased by 32.9 and 23.9%, respectively. The improvement effect of nanoimmersion on the RAC was obvious. The optimal condition was a combination of physical strengthening, 2 days of immersion in 2% NS solution, and vibration stirring. The 28 day compressive strength increased by 31.3%, the splitting tensile strength increased by 23%, and the flexural strength increased by 49%. The propose
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- Author
- Yuanxun Zheng; Yahui Zhang; Jingbo Zhuo; Peng Zhang; Weixing Kong
- Publisher
- Walter de Gruyter GmbH
- Published
- 2022
- Language
- EN
- Field
- Engineering (Physical Sciences)