An old safe filled with concrete would likely not be fireproof. While concrete itself is fire-resistant, the presence of other materials inside the safe, such as paper documents or electronic devices, could still be damaged or destroyed in a fire. Additionally, the concrete filling may crack or break under extreme heat, exposing the contents to fire damage. It is always best to use a safe specifically designed and tested for fire protection to ensure the highest level of security for important items. **

Yes, rubber insulation can be embedded in concrete. This can be done by placing the rubber insulation material within the concrete formwork before pouring the concrete. The rubber insulation will then become encased within the concrete as it sets, providing both thermal and sound insulation properties to the concrete structure. This method is commonly used in construction to improve the energy efficiency and acoustic performance of concrete buildings. **

Sound insulation in concrete walls works by reducing the transmission of sound waves through the material. This is achieved by increasing the density and thickness of the concrete wall, which helps to absorb and block the sound waves. Additionally, adding insulation materials such as foam or mineral wool within the wall cavity can further enhance sound insulation properties. By minimizing the vibrations and resonance of the wall, sound insulation in concrete walls helps to create a quieter and more comfortable indoor environment. **

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. **

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. **

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. **

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. **