A Manual for Design of Hot-Mix Asphalt with Commentary (2011) / Chapter Skim
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Chapter 1 - Introduction
Chapter 1 - Introduction
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Using RAP is becoming increasingly important in the HMA industry, and engineers and technicians responsible for HMA mix design should read Chapter 9 of this manual carefully. Laboratory personnel involved in developing designs for other mix types may also find Chapters 10 and 11 useful, which discuss the design of gap-graded HMA mixtures and open-graded friction course mixtures, respectively.
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The spreadsheet includes utilities for blending aggregates, performing volumetric calculations, determining weights for laboratory batches, and estimating specification properties for aggregate mixes from test data on individual aggregate stockpiles. In many cases, this manual refers directly to the HMA Tools spreadsheet and describes how HMA Tools is used to perform various steps in the mix design process.
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From page 3... ...
This distinction provides engineers and technicians with additional flexibility in adjusting aggregate gradations to meet volumetric requirements when developing mix designs. Furthermore, there is little research suggesting that aggregate gradation in and of itself affects HMA performance.
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