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EXPERIMENTAL INVESTIGATION ON WARM MIX ASPHALT AND RECLAIMED ASPHALT PAVEMENT (WMA-RAP) WITH ZYCOTHERM AS ADDITIVE FOR VILLAGE ROADS

Venkatesh A L, Vishwas, Tharun N V, Prema H O, Naveen G.

Department of civil engineering, CIT, Gubbi. Tumkur-572216

ABSTRACT:  Roads play a crucial role in ensuring the economic progress of our country. The basic infrastructures required for the development of rural areas are everlasting roads. The construction of roads using reclaimed asphalt pavement (RAP) is generated when asphalt pavements are removed for reconstruction or resurfacing as it consists of high-quality, well-graded aggregates coated by asphalt cement when properly crushed and screened. With increased demand and limited aggregate and binder supply, hot mix asphalt (HMA) producers discovered that RAP can be produced at lower temperatures (130˚C to 150˚C). Using warm mix asphalt (WMA) by mixing chemical additive allows lower consumption of recourses and thus releases less carbon dioxide. RAP is a valuable component in WMA. While several factors drive the use of RAP in asphalt pavements, the two primary factors are economic savings and environmental benefits. A study literature review shows research done in the area of WMA technologies. Reclaimed asphalt pavement is a useful alternative for virgin materials because it reduces the use of virgin aggregates and the amount of virgin asphalt binder required in the production of pavements. The present study involves the comparison of the variation in stability and durability properties of the WMA mixes containing different percentages of RAP material (10%, 20%, and, 30%) and virgin aggregates (90%, 80%, and 70%). The optimum binder content was found using the Marshall Stability test. The WMA is produced with the chemical additive “ZycoTherm” to improve the engineering properties of asphalt mixtures containing high contents of RAP. The adopted mixing temperature for WMA was 130˚C with an additive dosage rate of 0.1% by the weight of the binder. This study makes an effort to evaluate the properties of BC-I mix prepared using RAP material and to compare the Marshall properties of WMA produced with the chemical additive. In this present project work, it can be concluded that more than 10% and less than 30% of RAP can be suitably adopted in making the village roads with the RAP.