Specifications include, but are not limited to: The Oregon Military Department (OMD) seeks to repair the parking lot at the Bend Armory. Depending on the condition of the existing asphalt concrete, portions of the parking lot will require full reconstruction, removal and replacement of the asphalt concrete portion, or sealant. Cost to completely remove existing material up to 6 inches below the bottom of the existing base rock then replaced with crushed aggregate base; Cost to remove additional material beyond 6 inches below the bottom of existing base rock, described in Unit Price No. 1, Over Excavation, and then replace with crushed aggregate base over ; The existing site paving at the Bend Armory indicated significant block cracking and localized areas of alligator cracking. The site slopes slightly down to the east with a maximum elevation of about 3,613 feet and a minimum of about 3,606 feet (NAVD 88). 1. Asphalt: New AC should generally consist of a 4-inch profile of ½-inch hot mix asphalt concrete (HMAC) with a maximum lift thickness of 2 inches. The new AC shall: a. conform to ODOT SS 00744.13 and 00744.14 and be compacted to 91% of the maximum theoretical density (Rice value) of the mix, as determined in accordance with ASTM D2041. b. include a performance graded (PG) 64-28 asphalt binder, and level 3 asphalt concrete pavement. c. incorporate a polymer fiber reinforcement, such as ACE XP by Surface Tech (or approved equal), with fibers between a minimum of ¾ inches and up to a maximum of 1½ inches. 2. Base Course: New AC should be placed over an 8-inch compacted aggregate base. a. The new Base Aggregate should consist of clean crushed aggregate that contains no deleterious materials and meets the specifications provided in ODOT SS 02630.10 – Dense-Graded Aggregate, and has less than 10% by dry weight passing the US Standard No. 200 Sieve. b. The crushed aggregate base course should be placed in lifts with a maximum uncompacted thickness of 8 to 12 inches and be compacted to at least 95% of the maximum dry density, as determined by ASTM D1557. c. All base course areas must be proof-rolled and witnessed by the Geotechnical Engineer, including new base course areas and where existing base course is utilized (yellow areas).
