Characterisation of cement grouted bituminous mixes using marginal aggregates: Fid-Bau Portal

Characterisation of cement grouted bituminous mixes using marginal aggregates

Kaushik, Supratim / Siddagangaiah, Anjan Kumar

This study details the results of a laboratory study conducted to evaluate the properties of cement grouted bituminous mixes (CGBM) prepared with marginal aggregates. A conventional dense-graded bituminous concrete mix was also considered for the purpose of comparison. The CGBM specimens prepared were then evaluated in terms of its strength (Stability and Indirect Tensile strength), Elastic properties (Resilient modulus and Indirect Tensile Stiffness Modulus), Durability (Tensile strength ratio) and ravelling resistance (Cantabro Abrasion Test). Testing was conducted at two different curing periods (7 and 28 days) to consider the long-term strength gain of cement. Two test temperatures (25°C and 40°C) were considered to simulate the average and high-temperature properties. Further, both moisture conditioned and unconditioned states were examined to evaluate the susceptibility to moisture. Obtained results were statistically analysed to determine the critical effects of the curing period, temperature and moisture conditioning on the CGBM properties. An example of a low volume road was used to assess the cost related to the use of CGBM as a structural layer. Overall, laboratory results showed CGBM to be an effective method for the utilisation of marginal aggregates in routine road construction with enhanced material properties as compared to the control mix. Statistical analysis showed a significant influence of curing, temperature and moisture on the properties of CGBM. Further, the replacement of the conventional bituminous layer with CGBM resulted in a substantial reduction in material use, indicating that the use of marginal materials in CGBM could lead to sustainable road assets.