Superpave Gradation Requirements

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AASHTO MP 2

Superpave mix design specifies aggregate gradation control points through which aggregate gradations must pass. These control points are very general and are a starting point for a job mix formula.

These tables (data taken from AASHTO MP 2, Standard Specification for Superpave Volumetric Mix Design) show typical Superpave aggregate specifications for 37.5 mm (1.5 inch) down to 9.5 mm (0.375 inch) nominal aggregate sizes. Significant figures are the same as those in AASHTO MP 2.

**Table 1.** 37.5 mm (1.5 inch) Nominal Size
Sieve Size		Restricted Zone		Control Points
(mm)	(U.S.)	Lower	Upper	Lower	Upper
50	2 inch	100	–	–	–
37.5	1.5 inch	90	100	–	–
25	1 inch	–	90	–	–
19	3/4 inch	–	–	–	–
12.5	1/2 inch	–	–	–	–
9.5	3/8 inch	–	–	–	–
4.75	No. 4	–	–	34.7	34.7
2.36	No. 8	15	41	23.3	27.3
1.18	No. 16	–	–	15.5	21.5
0.60	No. 30	–	–	11.7	15.7
0.30	No. 50	–	–	10.0	10.0
0.15	No. 100	–	–	–	–
0.075	No. 200	0	6	–	–

**Table 2.** 25 mm (1 inch) Nominal Size
Sieve Size		Restricted Zone		Control Points
(mm)	(U.S.)	Lower	Upper	Lower	Upper
37.5	1.5 inch	100	–	–	–
25	1 inch	90	100	–	–
19	3/4 inch	–	90	–	–
12.5	1/2 inch	–	–	–	–
9.5	3/8 inch	–	–	–	–
4.75	No. 4	–	–	39.5	39.5
2.36	No. 8	19	45	26.8	30.8
1.18	No. 16	–	–	18.1	24.1
0.60	No. 30	–	–	13.6	17.6
0.30	No. 50	–	–	11.4	11.4
0.15	No. 100	–	–	–	–
0.075	No. 200	1	7	–	–

**Table 3.** 19 mm (3/4 inch) Nominal Size
Sieve Size		Restricted Zone		Control Points
(mm)	(U.S.)	Lower	Upper	Lower	Upper
25	1 inch	100	–	–	–
19	3/4 inch	90	100	–	–
12.5	1/2 inch	–	90	–	–
9.5	3/8 inch	–	–	–	–
4.75	No. 4	–	–	–	–
2.36	No. 8	23	49	34.6	34.6
1.18	No. 16	–	–	22.3	28.3
0.60	No. 30	–	–	16.7	20.7
0.30	No. 50	–	–	13.7	13.7
0.15	No. 100	–	–	–	–
0.075	No. 200	2	8	–	–

**Table 4.** 12.5 mm (1/2 inch) Nominal Size
Sieve Size		Restricted Zone		Control Points
(mm)	(U.S.)	Lower	Upper	Lower	Upper
19	3/4 inch	100	–	–	–
12.5	1/2 inch	90	100	–	–
9.5	3/8 inch	–	90	–	–
4.75	No. 4	–	–	–	–
2.36	No. 8	28	58	39.1	39.1
1.18	No. 16	–	–	25.6	31.6
0.60	No. 30	–	–	19.1	23.1
0.30	No. 50	–	–	15.5	15.5
0.15	No. 100	–	–	–	–
0.075	No. 200	2	10	–	–

**Table 5.** 9.5 mm (3/8 inch) Nominal Size
Sieve Size		Restricted Zone		Control Points
(mm)	(U.S.)	Lower	Upper	Lower	Upper
12.5	1/2 inch	100		–	–
9.5	3/8 inch	90	100	–	–
4.75	No. 4	–	90	–	–
2.36	No. 8	32	67	47.2	47.2
1.18	No. 16	–	–	31.6	37.6
0.60	No. 30	–	–	23.5	27.5
0.30	No. 50	–	–	18.7	18.7
0.15	No. 100	–	–	–	–
0.075	No. 200	2	10	–	–

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APA

Pavement Interactive. (2026, November 1). Superpave gradation requirements. HeadLight. Retrieved [the date you read it], from https://pavementinteractive.org/reference-desk/design/mix-design/superpave-gradation-requirements/

ASCE

Pavement Interactive. (2026). “Superpave Gradation Requirements.” HeadLight, <https://pavementinteractive.org/reference-desk/design/mix-design/superpave-gradation-requirements/> ([the date you read it]).

BibTeX

@misc{pavint-superpave-gradation-requirements,
  author = {{Pavement Interactive}},
  title = {Superpave Gradation Requirements},
  year = {2026},
  publisher = {HeadLight},
  howpublished = {\url{https://pavementinteractive.org/reference-desk/design/mix-design/superpave-gradation-requirements/}},
  note = {Accessed [date]}
}

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