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CE 4650 LECT. 12 (Aggregates-Surface Area)
Terms in this set (11)
surface area is used to estimate the ___ and is computed from ___.
- asphalt film thickness
- aggregate gradation
___ determines the effects of AC content in the mixture.
what is the formula for SA in aggregate and what are the units?
- SA = SA factor*(% passing the diff. sieve sizes)
- m²/kg or ft²/lb
generally, ___ is not considered as part of mixture design, but one can check for it in analysis to ___.
- film thickness
- prevent certain distresses
what two parameters does asphalt thickness depend on?
diameter of aggregate & % AC in the mix
what is film thickness computation based on?
the surface area concept
what is the surface area concept?
Tf = [Vasp/(SA×W)]*304,800
Tf is ___ film thickness and is correlated to ___.
- an average
thin asphalt thickness in mixtures can accelerate ___, which causes ___.
- premature failure
water can enter ___ film easier than ___ film, which may cause ___.
- water damage to aggregate susceptible to top water damage
what can water entering thin film induce?
rutting, shaving, raveling, and bleeding
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