Water feels like concrete when it is moving at a high velocity, such as in a fast-flowing river or waterfall, due to the force and pressure exerted by the water. This force can make it difficult to move through the water and can create a sensation similar to pushing against a solid surface. Additionally, the turbulence and churning of the water can create a sensation of resistance, further contributing to the feeling of solidity. This phenomenon is often experienced by swimmers and kayakers in fast-moving water. **

Concrete becomes water-resistant as it cures, which typically takes about 28 days. During the curing process, the concrete undergoes a chemical reaction that increases its strength and durability, making it more resistant to water penetration. However, it's important to note that while concrete becomes water-resistant over time, it is not completely waterproof and may still require additional sealing or waterproofing treatments for certain applications. **

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. **

The amount of materials needed for 1m3 of concrete can vary depending on the specific mix design and the desired strength of the concrete. However, a general guideline is that approximately 300-350 kilograms of cement, 600-750 kilograms of concrete aggregate, and 150-200 liters of water are needed for 1m3 of concrete. It's important to note that these quantities can vary based on the specific mix design and the properties of the materials being used. **

The amount of materials needed for 1m3 of concrete can vary depending on the mix design and desired strength of the concrete. However, a common mix design for concrete is 1:2:4, which means 1 part cement, 2 parts concrete gravel, and 4 parts water. For this mix design, approximately 350 kilograms of cement, 700 kilograms of concrete gravel, and 140 liters of water are needed to produce 1m3 of concrete. It is important to consult with a structural engineer or concrete supplier to determine the exact quantities needed for your specific project. **

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. **

Screed concrete typically allows water to pass through at a rate of around 1-2 liters per square meter per minute. This permeability is important for allowing excess water to drain away, preventing waterlogging and potential damage to the concrete structure. Proper drainage is essential for the longevity and durability of screed concrete surfaces. **