Post-Tensioning System for Small, Medium, and Large Force: Le-McCall System

The correct answer for the post-tensioning system used for small, medium, and large force is option 'D' - Le-McCall system. This system is widely used in post-tensioning applications due to its effectiveness and reliability. Let's delve into the details of the Le-McCall system.

1. Introduction to Post-Tensioning Systems
Post-tensioning is a technique used to reinforce concrete structures by introducing tensioned steel cables or tendons into the concrete. This technique helps in improving the strength and durability of the structures. Various post-tensioning systems are available, each with its own advantages and applications.

2. Le-McCall System Overview
The Le-McCall system is a post-tensioning system that employs a combination of pre-stressing and post-tensioning techniques. It is specifically designed to cater to small, medium, and large force requirements. The system consists of the following main components:

- Anchorages: These are the devices used to anchor the tendons to the concrete structure.
- Ducts: Ducts are the conduits through which the tendons are threaded.
- Tendons: Tendons are the high-strength steel cables or bars that carry the tension forces.
- Grouting: Grouting is the process of injecting grout or cementitious material into the ducts to protect the tendons and transfer the forces to the surrounding concrete.

3. Advantages of the Le-McCall System
The Le-McCall system offers several advantages, making it suitable for a wide range of force requirements:

- Versatility: The Le-McCall system can accommodate small, medium, and large forces, making it adaptable to various project needs.
- Strength and Durability: The high-strength tendons used in the system provide excellent load-carrying capacity and enhance the durability of the structure.
- Cost-Effectiveness: The Le-McCall system offers a cost-effective solution due to its versatility and ease of installation.
- Flexibility: The system allows for adjustments in the tendon forces during construction and throughout the service life of the structure.
- Longevity: Properly designed and installed Le-McCall systems have demonstrated long-term performance and durability in various applications.

4. Application of the Le-McCall System
The Le-McCall system has been successfully used in a wide range of structures, including bridges, buildings, parking structures, and water tanks. Its versatility and adaptability make it suitable for various force requirements, making it a preferred choice in the construction industry.

Conclusion
In conclusion, the Le-McCall system is the correct answer for the post-tensioning system used for small, medium, and large force requirements. This system offers versatility, strength, durability, and cost-effectiveness, making it an ideal choice for a wide range of applications. Its use in various structures highlights its effectiveness and reliability in the field of post-tensioning.