Toughness Performance of Recycled Aggregates for use in Road Pavement

Abstract

<span>The policy of driving organization such as Highways Agency is towards the use of performance related <span>specifications. This policy and adoption of European wide aggregate standards on the one hand, and <span>sustainable construction pressures on the other, all strongly emphasize on further need for more <span>developments to specifications and performance assessment methodologies instead of creating barriers to the <span>use of suitable materials. Performance related specifications for pavement foundations are being developed <span>and are primarily based around in-situ control and compliance testing. Laboratory based tools for assessment <span>of the performance of foundation materials and their durability under adverse conditions would be a key <span>factor to the successful use of alternative materials. <span>The toughness performance of recycled concrete aggregates (RCA) mixed with natural aggregates (NA) <span>was evaluated based on the test specifications given in the NCHRP Report 598. For this purpose Los <span>Angeles Abrasion and degradation test results were correlated with established Micro-Deval designations in <span>NCHRP report 598.Three main factors involved in performance assessment; i.e. (a) traffic loading, (b) <span>moisture levels in highway pavements and (c) the temperature conditions. The research study showed that <span>the materials were appropriate for unbound subbase for medium traffic in non freezing condition from the <span>standpoint of toughness. Also they are suitable for low traffic situations with low moisture and freezing <span>weather.</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span> </span>