PAVEMENT DESIGN OF CEMENT TREATED RECYCLED CONCRETE AGGREGATE BASES FOR LOW VOLUME ROADS

Generally, cement-treated bases are the non-conventional pavement layers used for improving the mechanical characteristics of base and sub-base courses. The present study focused on the design and analysis of the pavement with cement-treated bases made of Recycled Concrete Aggregates (RCA). The mechanical characteristics of the cement-treated recycled concrete aggregate mixes with 75% and 100% RCA are explored in the current study. The mixes with 2% and 4% cement are used as either a base or a sub-base for pavement design and analysis. To investigate the stresses and strains analysis and subgrade California Bearing Ratio (CBR) of 5% and 1 to 2 million standard axles (msa) of design traffic are considered. The reference pavement sections are considered corresponding to subgrade class-III and a total of 3 traffic categories ranging from T-7 to T-9 are considered as per the IRC: SP-72-2015. Initially, the Resilient Moduli (MR) of the pavement layers for corresponding reference sections are calculated. Using the above-calculated MR values, thicknesses and Poisson's ratio of 0.35 is considered corresponding to the granular layers. The allowable stresses and strains are estimated by using the KENPAVE software. By taking these stresses and strains as the benchmark, the pavement design and analysis was carried out. From the obtained results, it is concluded that the Cement Treated Mixes with 75% RCA and 100% RCA can be recommended for the base/sub-base layer materials especially for Low Volume Roads (LVRs).