Porous basalt aggregate is commonly used in roadbed engineering, but its application in concrete has rarely been studied. This paper studies the application of porous basalt in concrete. Porous basalt aggregate is assessed for its effects on mechanical strength and durability of prepared C50 concrete; because it has a hole structure, porous basalt aggregate is known for its porosity, and porous basalt aggregates can be made full of water through changing the content of saturated basalt; after full-water condition is achieved in porous basalt aggregate mixture of C50 concrete, we discuss its mechanical properties and durability. The effects of C50 concrete prepared with basalt aggregate on the compressive strength, water absorption, and electric flux of concrete specimens of different ages were studied through experiments, and the effects of different replacement rates of saturated porous basalt aggregate on the properties of concrete were also studied. The results show that porous basalt aggregate can be prepared as C50 concrete. For early saturated porous basalt aggregate concrete, its compressive strength decreases with the increase of the replacement rate of saturated aggregate; this occurs up to concrete curing at 28 d, when the replacement rate of saturated basalt aggregate is greater than or equal to 40 %. The compressive strength of concrete increases with the increase of the replacement rate of saturated aggregate. The 28 d electric flux decreases with the increase of the replacement rate of saturated aggregate, indicating that saturated porous basalt aggregate can improve the chloride ion permeability resistance of concrete in later stages.

Abstract
1. Introduction
2. Experimental
    2.1. Experimental Raw Materials
    2.2. Test Method
3. Results and Discussion
    3.1. Concrete Mix Design and Detection
    3.2. Compressive Strength of Concrete Specimens
    3.3. Electric Flux of Concrete
    3.4. Water Absorption Rate of Porous BasaltAggregate
    3.5. Compressive Strength of Saturated BasaltConcrete
    3.6. Electrical Flux of Saturated Basalt Concrete
    3.7. TG Analysis
    3.8. Microstructure Analysis
4. Conclusion
Acknowledgments
References

• Yuelei Zhu(Anhui Advanced Building Materials Engineering Laboratory, Anhui Jianzhu University, Hefei 230601, Anhui, China)
• Jingchun Li(Anhui Road and Bridge Engineering Group Co., Ltd, Hefei 230000, China)
• He Zhu(Anhui Road and Bridge Engineering Group Co., Ltd, Hefei 230000, China)
• Long Jin(Anhui Road and Bridge Engineering Group Co., Ltd, Hefei 230000, China)
• Qifang Ren(Anhui Advanced Building Materials Engineering Laboratory, Anhui Jianzhu University, Hefei 230601, Anhui, China)
• Yi Ding(Anhui Advanced Building Materials Engineering Laboratory, Anhui Jianzhu University, Hefei 230601, Anhui, China) Corresponding author
• Jinpeng Li(Anhui Advanced Building Materials Engineering Laboratory, Anhui Jianzhu University, Hefei 230601, Anhui, China)
• Qiqi Sun(Anhui Advanced Building Materials Engineering Laboratory, Anhui Jianzhu University, Hefei 230601, Anhui, China)
• Zilong Wu(Anhui Advanced Building Materials Engineering Laboratory, Anhui Jianzhu University, Hefei 230601, Anhui, China)
• Rui Ma(Anhui Advanced Building Materials Engineering Laboratory, Anhui Jianzhu University, Hefei 230601, Anhui, China)
• Won-Chun Oh(Department of Advanced Materials Science and Engineering, Hanseo University, Seosan 31962, Republic of Korea) Corresponding author