For shotcrete, the maximum aggregate size is 3/4 inch. Which metric size corresponds to this?

For shotcrete, the maximum aggregate size is 3/4 inch. Which metric size corresponds to this?

• A. 6.35 mm (1/4 in)
• B. 9.5 mm (3/8in)
• C. 12.7 mm (1/2 in)
• D. 19 mm (3/4 in)

Answer: (D)

Converting the maximum aggregate size from inches to millimeters shows the correct metric size. 3/4 inch equals 0.75 × 25.4 = 19.05 mm, so the metric size is 19 mm (rounding to the nearest millimeter). The other options correspond to smaller imperial sizes: 1/4 inch is 6.35 mm, 3/8 inch is 9.5 mm, and 1/2 inch is 12.7 mm. Since the maximum is 3/4 inch, 19 mm is the appropriate metric equivalent.

Converting the maximum aggregate size from inches to millimeters shows the correct metric size. 3/4 inch equals 0.75 × 25.4 = 19.05 mm, so the metric size is 19 mm (rounding to the nearest millimeter). The other options correspond to smaller imperial sizes: 1/4 inch is 6.35 mm, 3/8 inch is 9.5 mm, and 1/2 inch is 12.7 mm. Since the maximum is 3/4 inch, 19 mm is the appropriate metric equivalent.