(A) Damaged pavement sections should be identified by the town personnel. Evidence of a damaged pavement section is asphalt settlement, extensive cracking or asphalt failure.
(B) Damaged pavement sections should be repaired by first performing a clean asphalt cut around the horizontal limits of the damaged area as shown on the attached detail incorporated in § 156.04.
(C) The asphalt pavement and underlying 12 inches of subsurface soils should be over- excavated from the site. The existing exposed soils should be scarified to a depth of eight inches and recompacted in place. The scarified soil should be compacted to 95% of ASTM D698 (Standard Proctor) maximum dry density at a moisture content within 3% above or below the ASTM D698 optimum moisture content.
(D) (1) A minimum of 12 inches of crushed road base material shall be placed directly below the replacement asphalt pavement thickness.
(2) The road base material should comply with the attached State Transportation Department Gradation K specifications for base course aggregate incorporated in § 156.04.
(3) Road base should be placed in loose lifts not exceeding eight inches in thickness, and compacted to a minimum of 95% of ASTM D698 (Standard Proctor) maximum dry density at a moisture content within 3% above or below the ASTM D698 optimum moisture content.
(E) (1) Replacement asphalt thickness should be one and one-half times the original asphalt thickness, but not less than a minimum of four inches. Asphalt pavement materials should meet applicable requirements of the 2021 edition of the State Highway Department’s Specifications for Road and Bridge Construction, §§ 401, 402, 702 and 703.07. The asphalt concrete should be placed in maximum two-inch thick compacted lifts. Tack coats conforming with § 407 are recommended between lifts. A one-half-inch maximum size aggregate may be used for the lower lifts.
(2) Each lift of the asphalt concrete should be compacted to a minimum of 95% of the 50 blow Marshall compaction (ASTM D1559) density of the placed mixture. Marshall design should meet the following requirements:
(a) Stability: 1,500 pounds minimum;
(b) Flow: eight- to 18-hundredths of an inch;
(c) Air voids: 3 to 5%; and
(d) Voids in mineral aggregate (VMA): 14% minimum of three-fourths-inch and 15% minimum of one-half-inch maximum size aggregate.
(F) The town personnel should approve the proposed horizontal limits of the pavement cut and observe the repair of the pavement section to ensure the above standards are met.
(Ord. 233, passed 12-10-1992) Penalty, see § 10.99