Laboratory compaction is required to determine the relation of density and moisture content for road base layer. According to the standard roadwork specification (JKR, 2008), compaction test must comply with B.S. 1377: 1990. Based on that standard procedure using modified rammer of 4.5 kg and 1 litre standard mould, prepared with 5 layers and compacted for 27 blowers/layer, determine the laboratory compaction effort (kJ/m?). (Assume accleration due to a gravity is 9.81 m/s?) Q3 If the blows of laboratory compaction increase to 50 blows/layer and the specimen diameter is 100 mm and 200 mm height, determine the compaction layer of the specimens. Based on your result, give your comment on the adequacy of compaction layer.
Laboratory compaction is required to determine the relation of density and moisture content for road base layer. According to the standard roadwork specification (JKR, 2008), compaction test must comply with B.S. 1377: 1990. Based on that standard procedure using modified rammer of 4.5 kg and 1 litre standard mould, prepared with 5 layers and compacted for 27 blowers/layer, determine the laboratory compaction effort (kJ/m?). (Assume accleration due to a gravity is 9.81 m/s?) Q3 If the blows of laboratory compaction increase to 50 blows/layer and the specimen diameter is 100 mm and 200 mm height, determine the compaction layer of the specimens. Based on your result, give your comment on the adequacy of compaction layer.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Sand cone replacement test-method-was-conducted to-determine the density during the
construction of the road base layer. The result.of the test is shown in Table 2(a) and 2(b). As a
project engineer, you need to identify either the compaction effort for the construction of this
road base layer comply or not to-the Specifications of Roadwork by Public Work Department
(JKR 2008). According to the road-work-specifieation (JKR 2008), the road base layer must be
compacted at-least 95% of Maximum Dry Density. Based on your finding, put your comment
about the obtained result
Q2
Table 2(a): Density test result
Table 2(b): Moisture content test
Mass of tray
Mass of tray + soil
Mass of tray + dry soil
1.65 g
2.65 g
2.50 g
Bulk density, po
1939.67 kg/m3
Maximum Dry Density (MDD)
1760.00 kg/m3
Ans,Q3 NotQ2
Laboratory compaction is required to determine the relation of density and moisture content for
road base layer. According to the standard roadwork specification (JKR, 2008), compaction test
must comply with B.S. 1377: 1990. Based on that standard procedure using modified rammer of
4.5 kg and 1 litre standard mould, prepared with 5 layers and compacted for 27 blowers/layer,
determine the laboratory compaction effort (kJ/m?). (Assume accleration due to a gravity is 9.81
m/s?)
Q3
If the blows of laboratory compaction increase to 50 blows/layer and the specimen diameter is
100 mm and 200 mm height, determine the compaction layer of the specimens. Based on your
result, give your comment on the adequacy of compaction layer.
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