Masonry And Concrete

The strength of concrete is regulated by multiple factors, including the correct proportion of ingredients, the proper method of mixing, and adequate protection during the curing process. Each of these factors plays a crucial role in ensuring that the concrete reaches its desired strength. The correct proportion of ingredients ensures that the concrete has the right balance of materials, while the proper method of mixing ensures that the ingredients are thoroughly combined. Adequate protection during curing helps to prevent moisture loss and ensures that the concrete can properly hydrate and gain strength. Therefore, all of the mentioned factors are necessary for regulating the strength of concrete.

Bricks are a type of masonry material that is manufactured from clay and other materials. They are commonly used in construction for building walls, pavements, and other structures. Unlike stones, which are naturally occurring, bricks are man-made. Adobe is another type of masonry material, but it is made from a mixture of clay, sand, straw, and water. Course rubble's, on the other hand, are larger pieces of broken stones or concrete. Therefore, the correct answer is C. bricks.

All of the above options should be avoided when placing concrete to its final form. Segregation of particles can lead to an uneven distribution of aggregates and cement, resulting in a weaker and less durable concrete. Displacement of form and reinforcement can compromise the structural integrity of the concrete, leading to potential failure. Poor bond between successive layers of concrete can result in weak joints and reduced overall strength of the structure. To ensure a high-quality and long-lasting concrete structure, it is important to avoid all of these issues during the placement process.

Concrete hollow blocks are the most widely used masonry materials for construction works because they offer several advantages. They are lightweight, making them easier to handle and transport. They also have good thermal insulation properties, helping to regulate temperature inside buildings. Concrete hollow blocks are durable and resistant to fire, pests, and weathering. They can be easily molded into different shapes and sizes, allowing for versatility in construction projects. Additionally, they have good load-bearing capacity, making them suitable for various structural applications.

A plumb bob is a tool used to guide the vertical position in laying bricks. It consists of a weight attached to a string or line, which is then suspended from a fixed point. The weight of the plumb bob ensures that the line hangs straight down due to gravity, allowing builders to ensure that the bricks are aligned vertically. This tool is commonly used in construction and masonry work to achieve accurate and level brickwork.

Class AA mixture produces a hard or tough concrete.

This tendency is called segregation of particles. When gravel settles and lighter materials and water rise inside a container, it indicates that the particles are separating or segregating based on their size, density, or other properties. This can happen during the delivery process, causing the different components to become unevenly distributed within the container.

The correct answer is A because it provides a proportionate mix of water, cement, sand, and gravel. This mix ensures that the concrete will have the right consistency and strength for hand mixing. The ratio of water to cement is 1:2, which is commonly used in concrete mixing. The sand and gravel quantities are also appropriate, providing a good balance of aggregate for strength and stability.

Plasticity refers to the ability of concrete to be molded or deformed without segregation. It is a measure of how easily the concrete can be shaped and manipulated. A concrete mix with high plasticity is easier to work with and can be molded into different forms without losing its homogeneity. Therefore, plasticity is the correct term to describe the given characteristic of concrete.

Flexibility is not a requirement to consider in proportioning concrete mixture. When proportioning a concrete mixture, factors such as economy, workability, and strength are important to consider. Economy ensures that the mixture is cost-effective, workability determines how easily the mixture can be placed and compacted, and strength ensures that the concrete can withstand the intended load and stress. However, flexibility is not a requirement as it is not directly related to the proportioning of the concrete mixture.