Copyrighted by SPRINGDALE CODE & Municipal Code Corporation, 1998.

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Sec. 110-55. Asphalt stabilized base courses, asphalt hot mix binder courses and asphalt hot mix surface courses.

(a) Asphalt stabilized base course. Asphalt stabilized base course (black base) shall meet the AHTD standard specification requirements for hot mix asphalt stabilized base course, with the following exceptions:

(1) The depth of the asphalt-stabilized base shall be within plus or minus one-half inch of the designed depth. The average of all depth measurements shall be not less than the required depth, and any depth in excess of plus one-half inch shall not be used in computing the average depth. When string lined, the surface shall be within plus or minus one-half inch of the approved section.

(2) The aggregate shall meet the requirements for class 7 crushed stone base course.

(3) The aggregate and asphalt shall be mixed in an approved drum or batch plant, and placed on an approved subgrade with an approved lay-down machine.

(4) The mixture shall be rolled and compacted while hot to a minimum density of 95 percent of the maximum density as obtained by the AHTD standard proctor design procedures.

(5) Unless otherwise directed by the planning and community development director or his/her designated representative, a tack coat shall be used between succeeding asphalt layers. The tack shall meet the AHTD standard specification requirements for tack coat.

(6) The supplier shall submit to the planning and community development director or his/her designated representative a materials certification containing the aggregate gradation, asphalt content and the unit weight in pounds per cubic foot.

(b) Asphalt hot mix binder and asphalt hot mix surface courses. Asphalt hot mix binder and asphalt hot mix surface courses shall meet the AHTD standard specifications for hot mix binder and surface courses with the following exceptions:

(1) The depth of the asphalt hot mix binder course shall be within plus or minus one-half inch of the designed depth plus any additional depth required as a result of deficient depth of binder and base material. The average of all depth measurements shall be not less than the required depth, and any depth in excess of plus three-eights inch shall not be used in computing the average depth.

(2) The depth of the asphalt hot mix surface course shall be within plus or minus three-eights inch of the designed depth, plus any additional depth required as a result of deficient depth of binder and base material. The average of all depth measurements shall be not less than the required depth, and any depth in excess of plus three-eights inch shall not be used in computing the average depth.

(3) The crushed stone base course or cement-treated crushed stone base course shall be primed. The prime coat shall meet the AHTD standard specification requirements for prime coat.

(4) Unless otherwise directed by the planning and community development director or his/her designated representative, a tack coat shall be used between succeeding asphalt layers. The tack shall meet the AHTD standard specification requirements for tack coat.

(5) The binder course shall meet the gradation requirements for AHTD type II binder course or AHTD type II surface course or other types if approved by planning and community development director or his/her designated representative.

(6) The surface course shall meet the gradation requirements for AHTD type II or type III surface course, or other types if approved by planning and community development director.

(7) Prior to asphalt placement the supplier shall submit a materials certification giving the stability, gradation, asphalt content, and maximum theoretical density of the mix to the planning and community development director or his/her designated representative for approval.

(8) Both binder course and surface course shall be compacted to a minimum of 92 percent of maximum theoretical density as determined by the mix design.

(9) The minimum thickness of binder or surface courses shall be 1 1/2 inches. The maximum thickness that can be placed is four inches, provided the contractor can demonstrate that he can obtain the required density.

(10) The surface course surface, when checked with a ten-foot straight edge parallel to the centerline, shall not exceed plus or minus one-quarter inch.

(c) Portland cement concrete pavement. Portland cement concrete pavement shall meet the AHTD standard specification requirements for Portland cement concrete pavement, with the following exceptions:

(1) The depth of the concrete pavement shall be within plus or minus three-eights inch of the required design depth plus any additional depth required as a result of a deficient sub base depth. The average of all depth measurements shall be not less than the required depth, and any depth in excess of plus three-eights inch shall not be used in computing the average depth.

(2) The concrete shall have a minimum 28-day compressive strength of 4,000 psi. The concrete shall contain an air-entraining agent, which produces five percent plus or minus two percent air entrainment in the concrete. The slump shall be two to four inches if conventional paving equipment is used, and one to two inches if slipform paving equipment is used.

(3) The concrete shall be placed on an approved subbase, which shall be wetted just prior to placing the concrete.

(4) The concrete pavement shall be cured with a curing compound meeting the AHTD standard specifications for curing compound.

(5) See the City of Springdale, Arkansas Standard Details for Street and Drainage Construction.

(d) Surface test. The contractor shall check the pavement surface with a ten-foot straightedge and any correction to the surface shall be made to the flexible layers prior to final compaction or to the concrete surface while the concrete is still plastic.

(1) The finished surface when checked with a ten-foot straightedge parallel to the centerline shall show no deviation more than one-fourth inch for ACHM surfaces or concrete surfaces.

(2) Skin patching and feather edging of the final surface course will not be permitted. Surface deviations in excess of one-fourth inch shall be corrected as approved by the planning and community development director or his/her designated representative.

(Ord. No. 3258, § 1, 11-12-02)

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