68
4.2.6 Void in Mineral Aggregate VMA
In terms of VMA score, the score was obtained from the VMA result for each of sample. Take an example the result of VMA for 4.5 asphalt content, this result were obtained from
VMA result for each of sample A, B and C. The formula for VMA was 100 – percentage of
total aggregate volume; while percentage of total volume was obtained from 100-percentage of asphalt to mixture multiply by bulk specific gravity divided by aggregate mix. This
formula also mentioned in formula 2.10. The detail of calculation is as follow: VMA of Crumb Rubber 0
VMA Sample A Percentage of Total Aggregate Volume Sample A = 100-4.312.462.78 = 84.69.
VMA Sample A = 100-84.69 = 15.31 VMA Sample B
Percentage of Total Aggregate Volume Sample B = 100-4.312.422.78 = 83.52 VMA Sample B = 100-83.52 = 16.48
VMA Sample C Percentage of Total Aggregate Volume Sample C = 100-4.312.432.78 = 83.79
VMA Sample B = 100-83.79 = 16.21 The average of sample A, B and C = 15.31+16.48+16.21 : 3 = 16
VMA of Crumb Rubber 3 VMA Sample A
Percentage of Total Aggregate Volume Sample A = 100-4.312.542.78 = 87.47. VMA Sample A = 100-87.47 = 12.53
VMA Sample B Percentage of Total Aggregate Volume Sample B = 100-4.312.472.78 = 85.31
commit to user
69 VMA Sample B = 100-85.31 = 14.69
VMA Sample C Percentage of Total Aggregate Volume Sample C = 100-4.312.422.78 = 83.61
VMA Sample B = 100-83.61 = 16.39 The average of sample A, B and C = 12.53+14.69+16.39 : 3 = 14.54
VMA of Crumb Rubber 4 VMA Sample A
Percentage of Total Aggregate Volume Sample A = 100-4.312.402.78 = 82.79. VMA Sample A = 100-82.79 = 17.21
VMA Sample B Percentage of Total Aggregate Volume Sample B = 100-4.312.572.78 = 88.62
VMA Sample B = 100-88.62 = 11.38 VMA Sample C
Percentage of Total Aggregate Volume Sample C = 100-4.312.552.78 = 87.86 VMA Sample C = 100-87.86 = 12.14
The average of sample A, B and C = 82.79+88.62+87.86 : 3 = 13.58 VMA of Crumb Rubber 5
VMA Sample A Percentage of Total Aggregate Volume Sample A = 100-4.312.462.78 = 84.69.
VMA Sample A = 100-84.69 = 15.31 VMA Sample B
Percentage of Total Aggregate Volume Sample B = 100-4.312.432.78 = 83.63 VMA Sample B = 100-83.63 = 16.37
commit to user
70 VMA Sample C
Percentage of Total Aggregate Volume Sample C = 100-4.312.652.78 = 91.33 VMA Sample C = 100-91.33 = 8.67
The average of sample A, B and C = 15.31+16.37+8.67 : 3 = 13.46 In terms of Void in Mineral Aggregate VMA, the result of VMA will be presented in Table
4.13. The score of VMA should be mee the requirement of Bina Marga 2010.
Table 4.13. Void In Mineral Aggregate VMA
Asphalt Content VMA
VMA VMA
VMA CR 0
CR 3 CR 4
4,5 16,00
14,54 13,58
13,46 5,0
16,25 15,24
15,33 14,58
5,5 16,94
16,29 17,33
16,87 6,0
17,67 16,61
16,54 17,59
6,5 18,62
17,84 17,18
17,85 Specification
min 15 min 15
min 15 min 15
Based on Table 4.13 about Void in Mineral Aggregate VMA, it can be seen that the added of Crumb Rubber would decreased the score of VMA, then the added of Asphalt Content
would increased the score of VMA. In terms of VMA, the minimum score that has been recommended by Bina Marga 2010 is
15. Then, the description of VMA is presented in Figure 4.34. The last figure, namely Figure 4.34 will present the result of VMA test of crumb rubber 0, 3, 4, and 5.
Figure 4.34.VMA Test
5 10
15 20
4,5 5
5,5 6
6,5 VM
A
Asphalt Content
3 4
5
min 15
commit to user
71 Based on the Figure 4.34, it can be seen that the added of crumb rubber into 5 had the
highest score of VMA and the score was almost same with 0 Crumb Rubber. Then, the other crumb rubber added showed almost similar score of VMA.
4.2.7 Indirect Tensile Strength Test ITS
Kategori