Evaluation of Low-Quality Recycled Concrete Pavement Aggregates for Portland Cement-Treated Base
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2024-07-01
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Edition:Final Report January 2016 – July 2019
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Abstract:The Kansas Department of Transportation (KDOT) has begun to explore the incorporation of recycled concrete aggregates (RCAs) into portland cement-treated base (PCTB). KDOT currently employs a freeze-thaw method that includes 90 days of curing and 660 freeze-thaw cycles to determine the durability of concrete mixtures for pavements and stabilized bases. An experimental study was conducted to determine if low-quality RCA could adequately replace virgin aggregates in PCTB. Two sources of D-cracked aggregates were used to batch the PCTB mixture, while control samples were batched using virgin aggregates to mimic the gradation of the two RCA sources. Following the procedure specified by KDOT, the RCA and control samples were tested for freeze-thaw durability. Results showed that increasing the total amount of cementitious binder in the PCTB mixture increased the durability and that, at low binder contents, the RCA source influences the performance of the PCTB mixture with RCA. The RCA and control mixtures performed similarly, proving that RCA could be a viable aggregate source for PCTB. The conclusion was made, however, that new failure criteria must be developed for the freeze-thaw durability of PCTB mixture with RCA since the mass loss was an overriding issue.
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