1. Effect of air void structure and mechanical properties of high strength fiber reinforced mortar composed with different construction sand species based on X-CT technology.
- Author
-
Li, Tianyu, Liu, Xiaoyan, Zhang, Jingying, Shi, Fangying, Zhao, Mengfan, Shen, Xinxin, Zhu, Jie, Lyu, Kai, Shah, Surendra P., and Bao, Tengfei
- Subjects
- *
MORTAR , *SAND , *COMPOSITE construction , *PARTICLE size distribution , *POROSITY , *COMPRESSIVE strength - Abstract
The significant effect of desert sand on cement-based composites was observed in the previous investigation. However, how the composition of fine aggregate affects the formation of air void structure remains to be investigated. In this paper, mortars composed of five different sand mixtures were prepared, and the specific surface area (SSA) of the sand mixture with different content of fine aggregate was calculated. It was observed that the air void content decreased as the SSA value of the sand mixture increased. A negative-slope linear relation was observed between the SSA values and air void content in the composite construction sand fiber reinforced mortar system. With the increase of SSA, the air void number of every high-strength fiber reinforced mortar decreased from 12,446 to 6652. With the gradual increase of desert sand content, the count of air void number decreased. When the fine aggregate was completely desert sand, the air void content of the fiber-reinforced mortar dropped from 1.21% to 0.98%. Through the analysis of the 3D air void system, it can be concluded that the mixture of fine aggregate with different particle size distributions plays a positive role in optimizing the air void characteristics. Reasonable utilization of desert sand can significantly improve the pore structure characteristics and compressive strength of cement-based composites, which provides an effective theoretical basis for the development and utilization of desert sand resources. The function of different kinds of construction sand in the formation of air-void structure was investigated by X-CT technology. A negative-slope linear relationship was discovered between specific surface area (SSA) values and the entire air void content in the composite construction sand fiber reinforced mortar system. The mixture of river sand and desert sand plays a positive role in optimizing the air void characteristics and compressive strength. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF