Lightweight aggregate asphalt

Lightweight aggregate asphalt mix has been found to have lower thermal conductivity, which is desirable, than a conventional mix would have. The article “Influence of Selected Mix Design Factors on the Thermal Behavior of Lightweight Aggregate Asphalt Mixes” (J. of Testing and Eval., 2008: 1–8) reported on an experiment in which various thermal properties of mixes were determined. Three different binder grades were used in combination with three different coarse aggregate contents (%), with two observations made for each such combination, resulting in the conductivity data (W/m∙K) given here:

a. Test for the presence of interaction between the two factors. Use ­ .01.

b. Use ­ .01 to test the hypothesis that coarse aggregate content has no effect on thermal conductivity.

c. Use ­  .01 to test the hypothesis that asphalt binder grade has no effect on thermal conductivity.

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