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anti strip agent in addition to 1% of hydrated lime added to aggregates to resist against
stripping. Dosage rate of mineral fiber is 0.4% by total weight of mix. Superpave
Indirect tensile test is run on compacted mixes for both gradations, in order to obtain
fracture test parameters including energy ratio. Process of testing and criteria considered
are discussed in section 3.4 of this chapter. Selection of gradation based on higher energy
ratio for I-295 test section. Effect of moisture conditioning and long-term oven aging on
selected gradation.
3.3 Materials used for I-295 PFC project
3.3.1 Aggregate and Hydrated Lime
The final aggregate blend for Gradation (1) and Gradation (2) is composed of #67
Granite stone from Pit No TM-579/NS-315, #78 Granite Stone from Pit No GA-383 and
Granite Screens from Pit No. TM-579/NS-315. The FDOT codes for these source stone
stockpiles, #67 Granite is ‘54’, #78 Granite is ‘54’, and for Granite Screens is ‘23’
respectively. The producer of these aggregates is ‘Martin Marietta Aggregate’. Figure 3-1
shows the gradation band used for I-295 PFC project and control points as per FDOT
specification SECTION 337. Table 3-1 and Table 3-2 gives details of composing of job
mix formula of Gradation (1) and Gradation (2) respectively. One percent by weight of
aggregate hydrated lime is added to the mixture as an antistrip agent. ‘Global Stone
Corporation’ provided hydrated lime.
3.3.2 Binder and Mineral Fiber
An SBS polymer modified asphalt cement PG 76-22 with 0.5% antistrip agent was
used in this project. Mineral fiber used was regular FIBERAND ROAD FIBERS.
‘Atlantic Coast Asphalt Co.’ supplied asphalt and mineral fiber. The dosage rate of
mineral fiber was 0.4% by weight of total mix.