Introduction:
In a pre-stressed member, the use of high-strength concrete and high-tension steel is advisable. This combination offers several advantages over other options, making it the preferred choice for pre-stressed members in various construction applications.

Advantages of high-strength concrete:
1. Increased load-bearing capacity: High-strength concrete has a higher compressive strength, typically exceeding 40 MPa. This allows it to withstand higher loads and stresses, making it ideal for pre-stressed members that are subjected to heavy loads.
2. Reduced member dimensions: The higher strength of the concrete allows for a reduction in the cross-sectional area of the member while maintaining the required load-bearing capacity. This results in lighter and more slender members, leading to cost savings in materials and construction.
3. Better durability: High-strength concrete has improved resistance to environmental factors such as chemical attacks, freeze-thaw cycles, and abrasion. This increases the service life of pre-stressed members, reducing maintenance and repair costs in the long run.

Advantages of high-tension steel:
1. Higher tensile strength: High-tension steel, also known as high-strength steel or prestressing steel, has a higher tensile strength than conventional reinforcing steel. This allows it to withstand greater tensile forces without undergoing significant deformation or failure.
2. Reduced member deflection: The use of high-tension steel helps to minimize deflection in pre-stressed members, as it can provide higher levels of initial stress. This is particularly important in applications where deflection needs to be minimized, such as long-span bridges or high-rise buildings.
3. Improved crack control: High-tension steel helps to control the formation and propagation of cracks in pre-stressed members. By applying pre-compression to the concrete, the tensile stresses are minimized, reducing the likelihood of cracking and enhancing the overall structural integrity.

Combining high-strength concrete and high-tension steel:
The combination of high-strength concrete and high-tension steel in pre-stressed members offers synergistic benefits. The high-strength concrete provides the necessary compressive strength to handle heavy loads, while the high-tension steel provides the required tensile strength to resist tensile forces and control cracking. This combination allows for efficient and economical design, reducing material usage and construction costs while ensuring the long-term durability and performance of the pre-stressed members.

Conclusion:
In conclusion, the use of high-strength concrete and high-tension steel is advisable in pre-stressed members due to their enhanced load-bearing capacity, reduced member dimensions, improved durability, higher tensile strength, decreased deflection, and improved crack control. This combination offers numerous benefits and is widely used in the construction industry for various applications requiring pre-stressed members.