Home Improvement Siding Kitchen Windows Vinyl Pools Patio Security 0212

Section 23 – Asphalt Concrete

5. An Asphalt Institute viscosity-blending chart (or equal) indicating that the resultant

asphalt grade will be within 2000 cSt of the specified asphalt grading limits.

6. A power 45 grading chart showing the combined gradation and the associated

specification grading band of the virgin and asphalt-free RAP aggregate at the

proposed percentages.

For the purpose of quality control the following tests shall be performed by the Contractor:

TABLE 23-1. QUALITY CONTROL TESTING

Cal. Test 202 1/500 tons

At continuous mix plants from composite cold feed belt. At batch plants from hot bins.

Quality control testing shall be performed in a timely manner. Quality control test results

shall be provided to the Agency upon request.

Asphalt concrete shall be produced in conformance with the requirements of Section 39 of

the State Specifications, except that the requirement for storing and drying shall not apply to the

RAP material. Ingredient proportioning shall comply with the requirements of Section 39 of the

State Specifications. The virgin aggregate may be heated to a temperature of 340°F if, in the

opinion of the Agency, the higher temperature does not damage the virgin binder or the binder

in the RAP when the materials are combined.

When the recycled asphalt pavement mixture is produced by batch mixing, the time of

mixing shall not be less than thirty-five (35) seconds. When combined mathematically, the

virgin aggregate and the asphalt-free RAP aggregates shall conform to the design gradation as

required by these Specifications.

The Contractor’s mixing equipment shall be equipped with a suitable, safe sampling device,

or locations, capable of providing representative samples of virgin aggregates and RAP

production materials being incorporated into the recycled asphalt pavement mixture. Should a

continuous mixing plant be used, the RAP material shall be protected from direct contact with

the burner flame by means of a shield, separator, secondary drum or other method approved by

The binder shall be introduced into the mixer after the virgin aggregate and RAP material

have been combined. Should a batch mixing plant be used, the RAP material shall be kept

separate from the virgin aggregate until both ingredients enter the weigh hopper and/or pugmill.

Vehicles used for hauling asphalt concrete mixtures shall have tight, smooth, metal beds,

and shall be free from dust, screenings, excessive petroleum oils, volatiles, or other mineral

spirits that may affect the mix being hauled. Trucks shall be provided with tarpaulins or cargo

covers of sufficient size and weight to protect the entire load. Loads shall be covered when

necessary to achieve the specified density and finish quality.