Transcription of Chapter 2 Asphalt and Asphalt Paving Materials
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Chapter 2 Asphalt and Asphalt Paving Materials
Asphalt Paving Materials2-1 Asphalt Paving Materials2-1 Chapter 2 Asphalt and Asphalt Paving MaterialsASPHALT DEFINEDThe 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.) Asphalt is called a bituminous materialbecause it contains bitumen, a hydrocarbonmaterial soluble in carbon disulfate. The tarobtained from the destructive distillation ofsoft coal also contains bitumen. Both petrol-eum Asphalt and coal tar are referred to asbituminous Materials . However, because theirproperties differ greatly, petroleum asphaltshould not be confused with coal tar.
adhesive and highly waterproof and durable, making it particularly useful in road building. It is also highly resistive to the actions of most acids, alkalis, and salts. Covering more than 90 percent of the nationÕs paved highways, Asphalt Concrete is the most widely used paving material in the United States. For versatility, durability, and
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