Title:
Utilization of Reclaimed Asphalt Pavement Aggregates in Portland Cement Concrete for Concrete Pavement
Author(s):
Anol Mukhopadhyay and Xijun Shi
Publication:
Symposium Paper
Volume:
334
Issue:
Appears on pages(s):
13-32
Keywords:
reclaimed asphalt pavement, portland cement concrete, microstructure, durability, life cycle assessment
DOI:
10.14359/51720251
Date:
9/30/2019
Abstract:
Potential issues associated with depletion of good aggregate sources and management of excess RAP stockpiles increasingly motivate use of RAP in PCC as a coarse aggregate replacement. Texas has shown great interest in disposing excess RAP stockpiles and a systematic study on using RAP in PCC for Texas pavement applications was conducted by the authors recently. This paper provides a concise summary of the findings from this study. The major conclusions are (1) PCC mixture with dense aggregate gradation can be achieved by adding coarse
RAP with adequate intermediate sized particles, which offers better overall performance in terms of workability and mechanical properties, (2) RAP-PCC with coarse RAP replacement up to 40% showed considerable reduction for modulus of rupture. Asphalt cohesive failure (crack passing
through the asphalt layer) was found to be the main mechanism responsible for the strength reductions, (3) the addition of allowable amounts of RAP into PCC provides equivalent durability performance relative to plain PCC, and (4) constructing pavements with RAP-PCC yields economic, environmental and social benefits.
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