R2012-160 ACCEPTING THE BID AND AUTHORIZING CONTRACT

Home Browse Search

Compatibility of the aggregate, latex-modified emulsified asphalt, mineral filler, and other additives shall be verified by the mix design. The materials shall meet the following requirements for ISSA A143. ISSA Test No. Description Specification ISSA TB-139 Wet Cohesion @ 30 minutes min. (Set) 12 kg-cm min. 60 minutes min. Traffic 20 kg-cm min. or Near Spin ISSA TB-109 Excess Asphalt by LWT Sand 50 gm/sq ft (538 gm/sq m) max. Adhesion ISSA TB-114 Wet Stripping Pass 90% min. ISSA TB-100 Wet-Track Abrasion Loss One-hour Soak 50 gm/sq ft (538 gm/sq m) max. Six-day Soak 75 m/s ft 807 m/s m max. ISSA TB-147 Lateral Displacement 5% max. Specific Gravity after 1,000 Cycles 2.10 max. of 25 Ib 11.34 k ' ISSA TB-144 Classification Compatibility 11 Grade Points min. AAA, BAA ISSA TB-113 Mix Time @ 77 OF (25 °C) Controllable to 120 seconds Min. The mixing test and set-time test shall be checked at the highest temperatures expected during construction. The mix design shall report the quantitative effects of moisture content on the unit weight of the ' aggregate (bulking effect). The report shall clearly show the proportions of aggregate, mineral filler (minimum and maximum), water (minimum and maximum), additive usage, and latex- modified asphalt emulsion based on the dry weight of the aggregate. For the aggregate blend in the mix design, test results for AASHTO T 176 shall be provided with the mix information to the Engineer. Aggregate test values below 65 shall require review and approval from the Engineer. Before the work commences, the Contractor shall submit to the Engineer a complete mix design covering the specific materials to be used on the project. The percentages of each individual material required shall be shown in the laboratory report. The Engineer shall approve the mix design prior to its use. After approval, no substitutions will be permitted, unless approved by the Engineer, and the Contractor shall maintain continuous control of the latex-modified emulsified ' asphalt to dry aggregate proportioning to conform to the approved mix design within a tolerance of± 2 gal/ton (± 8 Umetric ton). ' Test Strip. For projects over 100,000 sq yd (83,600 sq m), at least one day prior to starting the project the Contractor shall designate a mutually agreeable location and apply a test strip of micro-surfacing using the aggregate indicated in the mix design. The Engineer will evaluate the ' micro-surfacing application rate and cure time.