Moreover, the edges of angular aggregate
produces a concentration stress when concrete is subjected to load forces and this then increases the possibility of cracks occurring easily around the pockets.
Modern performance requirements often dictate use of polymer-modified asphalt binders, strong angular aggregate
, and greater in-place density of the HMA.
This application typically is referred to as a "single coat chip seal" installation, which consists of a layer of mixed polymer resin applied to the bridge deck surface, followed by the application of a coarse (1/8 inch) angular aggregate
. The chip seal will reduce the amount of moisture that is able to penetrate into the deck but will not completely waterproof the deck.
The increase in density can be attributed to higher specific gravity of SSA and the better interaction between angular aggregates
. Higher densities are reported for concrete containing SSA [1, 29].
Caption: Figure 1: Illustration of morphological characteristic of aggregates: (a) angular aggregates
; (b) subround aggregates; (c) shape characterization.
The asphalt industry prefers angular aggregates
over the rounded form frequently used in foundries.