VMA 13 14 15 Air voids, % 3 8 3 8 4 6 Aggregate voids 60 80 65 85 70 85 filled with bitumen, % 70 70 70 Immersion compression specimen (AASHTO T 165) index of retained strength, % Figure 4.3: Graph of Stability against Bitumen Content Stability is the maximum load developed during the test; it is an indication of strength in the compacted material. The stability of the sample increased initially up to a bitumen content of 5.5%, and then began to fall with an increase of bitumen content, as shown in figure 4.3. The stability of the sample was optimum at a bitumen content of 5.5% with a value of 6700N which is greater than the minimum value of 6672N specified by the standard as given in table 4.5 for heavy traffic. Figure 4.4: Graph of Flow against Bitumen Content The flow is the deformation of the sample up to the moment when the maximum load occurs. The flow of the sample increased with increase in bitumen content up to a bitumen content, which is the conventional form, as shown in figure 4.4. The test yielded a maximum flow
VMA Air voids, % Aggregate voids filled with bitumen, % Immersion compression specimen (AASHTO T 165) index of retained strength, % 13 3 60 70 8 80 14 3 65 70 8 85 15 4 70 70 6 85 Figure 4.3: Graph of Stability against Bitumen Content Stability is the maximum load developed during the test; it is an indication of strength in the compacted material. The stability of the sample increased initially up to a bitumen content of 5.5%, and then began to fall with an increase of bitumen content, as shown in figure 4.3. The stability of the sample was optimum at a bitumen content of 5.5% with a value of 6700N which is greater than the minimum value of 6672N specified by the standard as given in table 4.5 for heavy traffic. Figure 4.4: Graph of Flow against Bitumen Content The flow is the deformation of the sample up to the moment when the maximum load occurs. The flow of the sample increased with increase in bitumen content up to a bitumen content, which is the conventional form, as shown in figure 4.4. The test yielded a maximum flow
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