By-Products Resource Manual

  • Hopkins, Tommy (PI)

Grants and Contracts Details


OBJECTIVES: The study will identify locations where byproduct materials that can be used in highway construction materials are produced and stored. Samples of the materials would be obtained and tests would be performed to detennine their engineering properties. Guidelines would be developed suggesting highway uses of the materials, based on past history and test results. A database would be created in a client-server windows environment so that key personnel of the twelve highway districts and central offices would be connected to the database and could access the information at any location in the state. Past performances of byproducts will also be considered. The pavement on a roadway, constructed with an aggregate road base containing Fluidized Bed Combustion (FBC) material obtained from an electrical power plant, was removed and reconstructed due to excessive swelling. A soil subgrade stabilized with another type of FBC material caused a delayed swell in the subgrade and overlying pavement layers. The swelling eventually stopped and the pavement was milled. Swell stopped and the sub grade has higher than normal bearing capacity some 15 years after construction. BACKGROUND: Industrial byproducts have been successfully used in highway construction. These materials offer economic solutions. For instance, bottom" ash, obtained for free from a coal-fired power plant, was used as a lightweight material to correct a landslide. Lime kiln dust, a hydrated lime byproduct, has been used very successfully to stabilize soil subgrades. Cinders obtained from industrial plants burning coal have been used in asphalt concrete. Fly ash from electrical coal-fired power plants is widely used in Portland cement concrete and flowable fill. Fly ash has been used in other states as structural fill for embankments. Shredded tires were used successfully during construction of a highway embankment a few years ago in a demonstration project sponsored by the Kentucky Transportation Cabinet. FY 2006 ACCOMPLISHMENTS: Several meetings and discussions were held with Cabinet officials and others in an effort to formulate a policy that would allow the use of non-hazardous bypro ducts. From this review, it was evident that byproducts produced by the many coal-fired power plants in the state may offer the best source of byproduct usage, mainly, because of the abundance and the distribution of those byproduct sources in the state, as well as the suitability of some of those materials for engineering applications. The objectives and scope of this study were defmed study after numerous meetings. A questionnaire was prepared and a survey of coal-fired power plants in Kentucky was conducted to determine which power plants were interested in becoming part of a program to make available byproduct materials for use by the Cabinet in highway applications. A case history of sites where byproducts have been used in highway applications in Kentucky was compiled. Data collection from interested power plants was initiated. FY 2007 PROPOSED WORK: Work will begin on formulating a formal process and policy for using byproducts, such as fly ash and bottom ash for highway applications. Latitudes and longitudes of specific sites containing byproducts that have been designated by the power plants interested in becoming a member of the recycling program will be obtained. Historical engineering and chemical data and other attributes of the designated materials will be tabulated in a database. A draft of a byproducts resource manual will be issued. PROJECTED COST THROUGH FY 2006: PROGRAMMED COST FY 2007: TOTAL ESTIMATED COST: $125,000 $100,000 $250,000
Effective start/end date7/1/066/30/07


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