In Proportioning Asphalt Mixtures, what is one seeking, to ensure a quality roadway? What properties of...

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Civil Engineering

In Proportioning Asphalt Mixtures, what is one seeking,to ensure a quality roadway? What properties of the final mix mustbe met? Explain your answer.

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The quality of the roadways is determined by its behaviour For example it must resist deformation and cracking be durable over time resist water damage provide a good tractive surface and yet be inexpensive readily made and easily placed In order to meet these demands the mix designer can manipulate all of three variables Aggregate Items such as type source gradation and size toughness and abrasion resistance durability and soundness shape and texture as well as cleanliness can be measured judged and altered to some degree Asphalt binder Items such as type durability rheology purity as well as additional modifying agents can be measured judged and altered to some degree The ratio of asphalt binder to aggregate Usually expressed in terms of percent asphalt binder by total weight of HMA this ratio has a profound effect on HMA pavement performance Because of the wide differences in aggregate specific gravity the proportion of asphalt binder expressed as a percentage of total weight can vary widely even though the volume of asphalt binder as a percentage of total volume remains quite constant By manipulating the variables of aggregate asphalt binder and the ratio between the two mix design seeks to achieve the following qualities Deformation resistance stability HMA should not distort rut or deform shove under traffic loading HMA deformation is related to one or more of the following Aggregate surface and abrasion characteristics Rounded particles tend to slip by one another causing HMA distortion under load while angular particles interlock with one another providing a good deformation resistant structure Brittle particles cause mix distortion because they tend to break apart under See Answer

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