Reuse of Recycled Aggregates of Demolition Building Debris as an Asphalt Binder Course in Road Pavements

Abstract

The application of building debris collected from the demolished buildings is an important issue in every country after crushing and screening. The undertaken research work includes a study for Reuse of Recycled Aggregates of Demolition Building Debris as an Asphalt Binder Course in Road Pavements. The study has been developed using a recycled aggregate from demolition building debris in the asphalt mixes and a natural aggregate was used for comparison. In this research a number of aggregate tests is conducted which are sieve analysis, specific gravity, absorption, abrasion, impact value and crushing value. These tests are to investigate the applicability of using the recycled aggregates of demolition building debris as an asphalt binder in road pavements. Also, for comparison, the same tests were applied on the conventional aggregates. Furthermore, number of bitumen tests is conducted. They are penetration test, softening point, ductility and specific gravity. The aim was to investigate its applicability to be used as a binder material. Marshal samples are prepared using both conventional blending aggregates and recycled blending aggregate to investigate the properties of the asphalt mix; flow, stability and density and comparing the results with the specifications. The results showed that it is possible to use the recycled aggregates in preparing the Asphalt Binder Course taking into account the need to increase the bitumen content (about 0.4%) more than the Asphalt binder course using the conventional aggregates (i.e. the optimum bitumen content using recycled aggregates is 5.7% and fro conventional is 5.3%). However, the economic study in this research shows that using the recycled aggregate is feasible and has less cost than using the conventional one.