Rev. 7-1-95
RECYCLING EXISTING CONCRETE PAVEMENT AS COMPACTED AGGREGATE
304-R-248
The Standard Specifications are revised as follows:
SECTION 304, AFTER LINE 80, INSERT AS FOLLOWS:
304.06.1 Recycling Existing Concrete Pavement as Compacted Aggregate. The Contractor will be permitted to reclaim and process removed concrete pavement into aggregates for use in the aggregate stabilization layer of the subbase for cement concrete pavement provided the specified gradations are achieved. Aggregate produced from crushed portland cement concrete shall not be used in new portland cement concrete pavement. Gradation and decant tests will be run by district testing, based upon the intended use, and passed or failed upon these results. Other tests such as Los Angeles abrasion, specific gravity, and absorption will be run for information purposes only. Only gradation and decant test results will control the basis for use. If the recycled materials have areas where the coarse aggregates are gravels, others where they are limestone, or others where they are slag, the piles of recycled materials shall be separated and handled separately. Such processing shall be limited to material obtained within the project limits. Broken portland cement concrete shall be handled and processed so as to minimize the incorporation of base, joint, or other foreign materials into the aggregate. Reinforcement and other steel materials shall be removed from the processed aggregate. When the aggregate to be produced is for compacted aggregate, an aggregate with a No. 53 gradation shall be manufactured. The compacted aggregate gradation, mixture, and handling shall be in accordance with 303 and 904.
If there is insufficient recycled concrete aggregate to complete the aggregate stabilization layer, the Contractor shall supply the necessary materials to complete this work. However, virgin materials shall not be blended with recycled material. Waste materials such as existing reinforcing steel, dowel bars, asphaltic materials, or subbase shall become the property of the Contractor. SECTION 304, AFTER LINE 102, INSERT AS FOLLOWS:
The costs of reclaiming, processing, and placing recycled concrete pavement as compacted aggregates shall be included in the costs of other pay items.