Transcription of CHAPTER 630 FLEXIBLE PAVEMENT
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CHAPTER 630 FLEXIBLE PAVEMENT
Highway design Manual 630-1 July 1, 2020 CHAPTER 630 FLEXIBLE PAVEMENT Topic 631 Types of FLEXIBLE Pavements & Materials Index Hot Mix Asphalt (HMA) HMA consists of a mixture of asphalt binder and a graded aggregate ranging from coarse to very fine particles. HMA is classified by type depending on the specified aggregate gradation and mix design criteria appropriate for the project conditions. The Department uses the following types of HMA based on the aggregate gradation: (1) Dense Graded HMA, (2) Gap Graded HMA, and (3) Open Graded Friction Course. HMA types are found in the Standard Specifications and Standard Special Provisions. Dense Graded HMA Dense graded HMA is the most common mix used as a structural surface course. The aggregate is uniformly graded to provide for a stable and impermeable surface. The aggregate can be treated and the asphalt binder can be modified. HMA could be made from new or recycled material.
Jul 01, 2020 · 630-4 Highway Design Manual July 1, 2020 631.8 Pavement Interlayers Pavement interlayers are used with asphalt pavement as a means to retard reflective cracks from existing pavement into the new flexible layer, prevent water infiltration deeper into the pavement structure, and enhance pavement structural strength. Two types of
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