Concrete should not be mixed with very salty sand as the high salt content can have a detrimental effect on the concrete's strength and durability. The salt can cause corrosion of the steel reinforcement within the concrete, leading to structural issues over time. It is recommended to use clean, freshwater sand when mixing concrete to ensure the quality and longevity of the final product. **

"Sun and Concrete" is a novel that follows the story of a young man named Alex who is struggling to find his place in the world. Set in the backdrop of a gritty urban environment, the novel explores themes of identity, self-discovery, and the search for meaning in a seemingly indifferent world. As Alex navigates through the challenges of his surroundings, he grapples with his own inner turmoil and the complexities of human relationships. The novel delves into the raw and authentic experiences of its characters, offering a poignant and thought-provoking exploration of the human condition. **

Concrete paving slabs are laid with jointing sand by first preparing the base with a layer of compacted sand or gravel. The slabs are then laid in the desired pattern, leaving a small gap between each slab for the jointing sand. Once the slabs are in place, the jointing sand is spread over the surface and swept into the gaps, ensuring that the sand fills the joints completely. Finally, the surface is compacted with a plate compactor to settle the slabs and lock the jointing sand in place. This process helps to create a stable and durable surface for the paving slabs. **

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. **

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. **

To make concrete, you typically mix cement, sand, and water in specific proportions. The most common ratio is 1 part cement, 2 parts sand, and 3 parts water. First, mix the dry ingredients (cement and sand) thoroughly. Then, gradually add water while continuously mixing until you achieve a homogeneous mixture with a workable consistency. Finally, the concrete is ready to be poured and shaped into the desired form before it sets and hardens. **

The most suitable sand for setting concrete lawn edging stones is coarse sand. Coarse sand has larger particles that provide better stability and support for the edging stones. It also allows for proper drainage and helps prevent the stones from shifting or sinking over time. Additionally, coarse sand provides a strong base for the edging stones, ensuring they stay in place and maintain their position. **

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. **