Page 67 - Lecture Notes DCC3113

i. The sand equivalent of aggregate fraction passing the No. 4 (4.75mm) sieve when tested in
accordance with ASTM D 2419 shall be not less than 45%.
ii. The fine aggregate angularity when tested in accordance with ASTM C1252 shall be not less
than 45%.
iii. The Methylene Blue value when tested in accordance with Ohio Department of Transportation
Standard Test Method shall be not more than 10 mg/g.
iv. The weighted average loss of weight in the magnesium sulphate soundness test (5 cycles) when
tested in accordance with AASHTO Test Method T 104 shall be not more than 20%.
v. The water absorption when tested in accordance with MS 30 shall be not more than 2%.

Notwithstanding compliance with the requirements of this Specification, limestone aggregates shall not
be permitted for use in wearing course.

The gradation of the combined coarse and fine aggregates, together with mineral filler, shall conform to
the appropriate envelope shown in Table 4.3.3.

Source : Jabatan Kerja Raya, STANDARD SPECIFICATION FOR ROADWORKS, JKR/SPJ/2008-S4,
2008 (page 32)

(b) Mineral Filler

Mineral filler shall be incorporated as part of the combined aggregate gradation. It shall be of finely
divided mineral matter of hydrated lime (calcium hydroxide). At the time of mixing with bitumen, the
hydrated lime shall be sufficiently dry to flow freely and shall be essentially free from agglomerations.
Not less than 70% by weight shall pass the BS 75 um sieve. The total amount of hydrated lime as mineral
filler shall be limited such that the ratio of the combined coarse aggregate, fine aggregate and mineral
filler of the final gradation passing 75 um sieve to bitumen, by weight, shall be in the range of 0.6 to 1.2.
As a guide, the total amount of hydrated lime shall be approximately 2% by weight of the combined
aggregates. The hydrated lime shall also be treated as an anti-stripping agent.

(c) Bituminous Material

Bituminous binder for asphaltic concrete shall be bitumen of penetration grade 60-70 or 80-100 which
conforms to MS 124, or polymer modified binder.

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