Page 64 - Lecture Notes DCC3113

iv. The weighted average loss of weight in the magnesium sulfate soundness test (5 cycles) when
tested in accordance with AASHTO Test Method T 104 shall be not more than 18%.
v. The material shall have a CBR value of not less than 80% when compacted to 95% of the
maximum dry density determined in the B.S. 1377 Compaction Test (4.5 kg rammer method)
and soaked for 4 days under a surcharge of 4.5 kg;
vi. The sand equivalent of aggregate fraction passing the No. 4 (4.75 mm) sieve when tested in
accordance with ASTM D 2419 shall be not less than 45%.
vii. The gradation shall comply with the envelope as shown in Table 4.2.3

Source : Jabatan Kerja Raya, STANDARD SPECIFICATION FOR ROADWORKS, JKR/SPJ/2008-S4,
2008 (page 16)

Wet-Mix Road Base

Materials

Aggregate for wet-mix roadbase shall be crushed rock, crushed gravel or a mixture of crushed rock and
gravel, which shall be hard, durable, clean and essentially free from clay and other deleterious materials.
The aggregate shall conform to the following physical and mechanical quality requirements:-
i. The flakiness index when tested in accordance with MS 30 shall be not more than 25%.
ii. The aggregate crushing value when tested in accordance with MS 30 shall be not more than 25%.
iii. The weighted average loss of weight in the magnesium sulfate soundness test (5 cycles) when
tested in accordance with ASSHTO Test Method T 104 shall be not more than 18%.
iv. The sand equivalent of aggregate fraction passing the No. 4 (4.75 mm) sieve when tested in
accordance with ASTM D 2419 shall be not less than 45%.
v. The gradation shall comply with the limits shown in Table 4.2.4.

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