Question

a circular concrete pad has a diameter of 12 ft and is 4 inches thick. *
2 point
how many cubic yards of concrete are required?
your answer

which tool is used to create rounded edges on concrete to prevent chipping?

• 2 point

a. groover
b. float
c. edger
d. screed

what tool is used to push coarse aggregate below the surface and bring paste to the top?

• 2 point

a. screed board
b. broom
c. float
d. edger

Explanation:

Step1: Convert units to yards

Diameter: $12\ \text{ft} = \frac{12}{3} = 4\ \text{yd}$, so radius $r = \frac{4}{2} = 2\ \text{yd}$
Thickness: $4\ \text{in} = \frac{4}{36} = \frac{1}{9}\ \text{yd}$

Step2: Calculate volume of cylinder

Volume formula: $V = \pi r^2 h$
$V = \pi \times (2)^2 \times \frac{1}{9} = \frac{4\pi}{9} \approx 1.396\ \text{cubic yards}$

This tool is specifically designed to shape concrete edges into a rounded profile, which reduces stress concentrations and prevents chipping.

A float works to embed coarse aggregate particles below the concrete surface while bringing the finer cement paste to the top for a smooth finish.

Answer:

$\approx 1.40$ cubic yards (or $\frac{4\pi}{9}$ cubic yards)

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