Stabilization of cement-treated base mixes incorporating high reclaimed asphalt pavement materials using stabilizer rich in SiO2 and Al2O3

Using RAP material can be one of the promising solutions for solving the new material issues, reducing haulage distance and fuel cost to a great extent as the complete process is done at site only using the Full-depth recla-mation (FDR) technique. However, the effect of the high amount of RAP material with stabilizer has not been completely understood for constructing the CTB layer. In the present study, a mixed design of the CTB layer has been formulated considering the requirements of Indian Specifications to utilize maximum RAP material in a sustainable approach. Mechanical and durability properties of CTB mix were evaluated to identify the effect of different cement, stabilizers, and RAP aggregates on the laboratory mixtures. The efficacy of stabilizer with cement was examined to judge the suitability of the same as potential pavement construction materials. The optimal mix was decided mainly based on the Unconfined Compressive Strength (UCS) value and flexural strength of aggregate specimen at 7-days of moist curing. However, for a detailed study, UCS values were checked at three days, seven days, and 28 days. Also, the durability properties of the CTB mix were analyzed by performing a durability test, sorptivity, and rapid chloride penetration test (RCPT). Present laboratory studies firmly indicated that using a stabilizer with cement using 70 % RAP leads to a strong and durable CTB mix.

Automated summary

Using RAP material with stabilizer can effectively solve new material issues, reduce haulage distance, and save fuel costs. A mixed design of the CTB layer was formulated to make maximum use of RAP material in a sustainable way, and the mechanical and durability properties were evaluated through laboratory tests. The optimal mix was determined based on the Unconfined Compressive Strength (UCS) value and flexural strength, and the durability properties were analyzed through various tests. The results showed that using 70% RAP with stabilizer leads to a strong and durable CTB mix.