There are a lot variables involved, so it's hard to draw absolute conclusions that apply to all blades across the board (pardon the pun...). How quickly any blade dulls depends in part on the type of grind that it has, hook angle, carbide hardness, side clearance, blade height, user technique, moisture content of the material, heat, etc....all play a role. Grinds that have pointy tips like Hi-ATB and ATB grinds tend to abrade faster than other grinds, and they'll definitely wear more rapidly in very dense brittle or abrasive materials. A triple chip grind that has the corners of the teeth mitered off will hold up better, but they give up some sheering action....with no sharp points to wear down, I'm not sure if this type of grind would wear any faster in brittle manmade stuff than in wood.
I'm assuming the OP's blade is an ATB or possibly a Hi-ATB, so it's likely that the materials he mentioned will wear that blade faster than most common hardwoods like cherry, oak, walnut, ash, poplar, or soft maple.
Last edited by knotscott; 04-13-2012 at 08:06 PM.