Table 5.

Gradation of aggregates

Gradation IGradation IIGradation IIIGradation IV
Sieve aperturePassing weight (g)Sieve aperturePassing weight (g)Sieve aperturePassing weight (g)Sieve aperturePassing weight (g)
19 mm50004.75 mm500019 mm15004.75 mm500
9.5 mm30002.36 mm366216 mm11252.36 mm450
4.75 mm01.18 mm260612.5 mm7501.18 mm325
Surface area m2 kg−10.41600 µm18319.5 mm0600 µm200
300 µm1197300 µm100
150 µm704150 µm25
75 µm49375 µm0
Surface area m2 kg−16.12

Gradation I follows the recommended gradation by NZS 4407 (Standards New Zealand 2015) for the standard WQI test. Gradation II was selected from the fine portion of the mid-range gradation of suggested limits for UGMs (TNZ M/4, NZTA 2006). Gradations III and IV comply with ASTM Standard D6928 (ASTM 2017) and ASTM Standard D7428 (ASTM 2015a), respectively.