Chapter 2 Asphalt and Asphalt Paving Materials
2016-9-9 · The black cementing agent known as asphalthas been used for road construction forcenturies. Although there are natural depositsof asphalt, or rock asphalt, most used today isproduced by the oil refining industry. Asphaltis a constituent of most petroleums and isisolated through the refining process ofdistillation. (See Figure 2-1.)
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