Landscaping License Practice Test

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for your Landscaping License Test with flashcards and multiple-choice questions. Gain insights with hints and explanations, and excel in your exam!

Practice this question and more.

How is the concentration joint spacing for a concrete slab calculated?

Width of the slab
12 x thickness (in inches) of the slab
2 x length of the slab
12 x length (in feet) of the slab

The correct answer is: 12 x thickness (in inches) of the slab

The concentration joint spacing for a concrete slab is calculated as 12 times the thickness of the slab in inches. This formula is based on industry standards that help mitigate cracking and ensure the structural integrity of the slab. As concrete cures and shrinks, tension builds up in the material. Proper joint spacing helps relieve this tension, reducing the likelihood of cracking. By using the thickness to determine joint spacing, the formula takes into account the slab's ability to withstand stress relative to its size. For instance, a thicker slab will naturally require longer spacing between joints to maintain stability and manage movement effectively. Using other dimensions, such as the width or length of the slab, may not directly correlate with the necessary control over late-stage shrinkage and stress relief, which is why the thickness is the most relevant measurement in this context.