The remaining concrete in concrete pumps can be cleaned out and reused for future projects. This process involves flushing the pump with water to remove any leftover concrete and then collecting and recycling the washed-out concrete. This helps to minimize waste and reduce the environmental impact of concrete pumping operations. Additionally, the cleaned-out concrete pump can then be used for the next job without any leftover material causing issues. **

To apply concrete on concrete, the existing surface must be clean, free of debris, and properly moistened. A bonding agent or primer should be applied to the existing concrete to ensure adhesion. The fresh concrete mix can then be poured or pumped onto the existing surface and spread evenly using a screed or trowel. It is important to properly cure the new concrete to prevent cracking and ensure a strong bond between the two layers. **

Yes, it is possible to pour new concrete over old concrete as long as the existing concrete is in good condition and properly prepared. The old concrete should be clean, free of any loose debris, and roughened to provide a good bonding surface for the new concrete. Additionally, a bonding agent may be used to ensure a strong bond between the old and new concrete. It is important to consult with a professional to assess the condition of the existing concrete and determine the best approach for pouring new concrete over it. **

Concrete creep in prestressed concrete can lead to an increase in long-term deformation and deflection of the structure over time. This can result in a decrease in the effectiveness of the prestressed concrete members and potentially compromise the structural integrity of the overall system. Additionally, concrete creep can cause stress redistribution within the structure, leading to potential cracking and reduced durability. Therefore, it is important to consider and account for concrete creep in the design and construction of prestressed concrete structures to ensure their long-term performance and safety. **

For setting lawn edging stones, garden concrete would be the better option. Garden concrete is specifically designed for outdoor use and is more durable and weather-resistant than concrete screed. It also has better adhesion properties, making it more suitable for securing the edging stones in place. Additionally, garden concrete is often formulated to be more resistant to cracking and shifting, which is important for maintaining the integrity of the lawn edging. **

The capacity of a concrete mixer can vary, but a typical concrete mixer can hold between 0.5 to 1.0 cubic meters of concrete. This means that a concrete mixer can hold anywhere from 500 to 1000 liters of concrete, depending on its size and design. It's important to check the specific capacity of the concrete mixer before using it to ensure that it can accommodate the amount of concrete needed for a particular project. **

It is unclear whether the concrete belt was poured with the wrong concrete based on the information provided. To determine if the wrong concrete was used, further investigation would be needed to compare the specifications of the concrete used with the requirements for the project. Factors such as strength, composition, and curing methods would need to be considered to determine if the concrete used was indeed incorrect. **

It is unclear whether the concrete ring was poured with the wrong concrete based on the information provided. The concrete ring may have been poured with the wrong concrete mix if it did not meet the required specifications or if it resulted in structural issues. Further investigation or clarification from the relevant parties would be needed to determine if the wrong concrete was used for the project. **