What is the recommended slump for flatwork concrete?

What is the recommended slump for flatwork concrete?

• A. 1 to 2 inches (25 to 50 mm)
• B. 3 to 5 inches (75 to 125 mm)
• C. 5 to 7 inches (125 to 175 mm)
• D. 7 to 9 inches (175 to 225 mm)

Answer: (B)

The recommended slump for flatwork concrete typically falls within the range of 3 to 5 inches (75 to 125 mm). This slump is ideal for achieving a good balance between workability and stability during finishing operations. A slump within this range ensures that the concrete can be easily placed and finished without excessive segregation or bleeding, which can compromise the integrity of the surface. Concrete with a slump that is too low may be difficult to work with, leading to problems such as inadequate filling of forms or surfaces. Conversely, a slump that is too high can result in excessive water, which can weaken the overall strength of the concrete and lead to long-term issues like cracking and scaling. Therefore, maintaining a slump between 3 to 5 inches allows for optimal performance in flatwork applications, ensuring better placement, finishing, and overall durability of the finished surface.

The recommended slump for flatwork concrete typically falls within the range of 3 to 5 inches (75 to 125 mm). This slump is ideal for achieving a good balance between workability and stability during finishing operations. A slump within this range ensures that the concrete can be easily placed and finished without excessive segregation or bleeding, which can compromise the integrity of the surface.

Concrete with a slump that is too low may be difficult to work with, leading to problems such as inadequate filling of forms or surfaces. Conversely, a slump that is too high can result in excessive water, which can weaken the overall strength of the concrete and lead to long-term issues like cracking and scaling. Therefore, maintaining a slump between 3 to 5 inches allows for optimal performance in flatwork applications, ensuring better placement, finishing, and overall durability of the finished surface.