It makes sense to use only pure concrete in situations where the load and stress on the structure are minimal, such as in sidewalks, driveways, and small retaining walls. Pure concrete is sufficient for these applications and is more cost-effective than using reinforced concrete. Reinforced concrete is necessary in situations where the structure will be subjected to heavy loads, such as in building foundations, bridges, and high-rise buildings. The addition of steel reinforcement helps to strengthen the concrete and prevent cracking or failure under heavy loads, making it the preferred choice for these types of structures. **

No, the foundation of a building or structure does not have to be made only of concrete. While concrete is a common material used for foundations due to its strength and durability, other materials such as stone, brick, and wood can also be used depending on the specific requirements of the project. The choice of material for the foundation will depend on factors such as the type of soil, the load-bearing capacity needed, and the local building codes and regulations. **

Concrete only hardens when cement is added because cement is the binding agent that holds the other components of concrete together. When water is added to cement, a chemical reaction called hydration occurs, forming a paste that coats the aggregates and binds them together. This paste gradually hardens over time, creating a strong and durable material. Without cement, the components of concrete would not be able to bind together and harden into a solid structure. **

No, 4K resolution is not only available for YouTube premium members. YouTube offers 4K resolution videos to all users, both free and premium. However, the ability to stream videos in 4K resolution may depend on the device being used and the internet connection speed. Some older devices or slower internet connections may not support 4K streaming. **

Concrete hardens through the addition of cement because cement is the binding agent that holds the other components of concrete together. When water is added to cement, it undergoes a chemical reaction called hydration, which causes it to form a solid mass that binds the aggregates (such as sand and gravel) together. Without the addition of cement, the other components of concrete would not be held together in a solid, durable structure. Therefore, cement is essential for the hardening and strength of concrete. **

One Piece is only available for premium members on Crunchyroll because it is a popular and highly sought-after anime series. By making it exclusive to premium members, Crunchyroll can incentivize more viewers to subscribe to their premium service, which helps support the production and licensing costs of the show. This model allows Crunchyroll to continue offering a wide range of anime content to its users while also ensuring that popular series like One Piece receive the necessary financial support for their continued production and distribution. **

No, a pole dance pole does not have to be attached to a concrete ceiling. There are various types of poles available that can be installed on different surfaces such as wood, tile, or even carpeted floors. Some poles are designed to be tension-mounted and do not require any drilling or permanent installation, making them versatile and suitable for a variety of spaces. It is important to ensure that the pole is securely installed according to the manufacturer's instructions to ensure safety during use. **

No, a balcony concrete slab that is only 8 cm thick may not be able to support a 10 cm thick screed. The additional weight of the thicker screed could exceed the load-bearing capacity of the thin concrete slab, leading to potential structural issues and safety concerns. It is important to consult with a structural engineer or construction professional to determine the appropriate thickness and load-bearing capacity for the balcony concrete slab. **