United States Department of Transportation
i
Field Implementation of High-Volume Recycled Materials for Sustainable Pavement Construction
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2020-01-01
[PDF-3.35 MB]
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Alternative Title:Report # 00046728, Volume II: Field Implementation of High-Volume Recycled Materials for Sustainable Pavement Construction
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Edition:Final Report, Period: 5/1/2014 – 12/31/2019
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Abstract:The objective of this study was to evaluate the feasibility of producing sustainable concrete materials for rigidpavement construction using high volume of recycled materials. The goal was to replace 50% of all solid materials inthe concrete with recycled materials and industrial by-products. This included the replacement of cement with at least50% supplementary cementitious materials (SCMs) and aggregate with 50% recycled concrete aggregate (RCA). Nineoptimized mixtures from the first phase of the project that exhibited satisfactory performance were selected for theconstruction of single layer and two-lift rigid pavement systems. Life cycle cost assessment indicated that sustainableconcrete with optimal SCMs and RCA can lead to cost savings of 17.6% of agency costs, 12.1% of user cost, 12.1%of social cost, and 17.5% of total life cycle cost. The development of a database and analysis using artificialintelligence was performed to quantify the properties of concrete as a function of RCA characteristics. Test resultsobtained through the case study indicated that the reduction in the modulus of elasticity (MOE) of pavement concretecan be limited to 10% when the coarse RCA has a water absorption lower than 2.5%, Los Angeles (LA) abrasion lessthan 23%, or oven dry specific gravity higher than 156 lb/ft3 (2500 kg/m3) for concrete made with 100% RCAreplacement rate. The water absorption, specific gravity, and LA abrasion mass loss of RCA were found to categorizethe RCA quality and resulting engineering properties of concrete made with RCA. The selection of RCA with a lowerwater absorption and LA abrasion mass loss and a higher oven dry specific gravity corresponded to a higher quality ofRCA that can produce concrete with greater mechanical properties.
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