Mechanical and physical properties of recycled concrete aggregates for road base materials

The utilization of recycling recycled concrete aggregates (R-RCA) in road base construction is an option of value-added waste materials. The evaluation of R-RCA appropriateness as a road base material need to study. The use of massive amount of RCA in construction projects has acquired wide notoriety. The use of RCA is due to decrease- of amount natural rock as the original aggregate. The main objectives of this study are to characterize properties of R-RCA as road material, to determine mechanical and physical properties as a road base material, and to identify the R-RCA bearing capacity for road base comparison to natural aggregates. The mechanical and physical properties tests conducted according to standard, including particle size distribution Los Angeles Abrasion, Aggregate Crushing Value, Aggregate Impact Aggregate Density, Flakiness Index, Water Absorption, and California Bearing Ratio (CBR). The results show that the aggregates have an excellent distribution particle size, durability, and shapes as required by specifications R-RCA also produced appropriate CBR and strength for road base applications. These results stipulate exclusive information to utilize R-RCA as aggregates for road base construction. R-RCA can be used as road base construction materials, and its engineering properties transform from waste materials to value-added road base construction. Recycling of RCA not only can diminish the road base construction cost and decrease landfill space needed for disposal, but it engineering properties prone as road base construction, and considered a renewable resource

A laboratory study of the effect of fiberglass additive on the behavioural properties of rap asphalt mixtures

The increase in the amount of reclaimed asphalt pavement (RAP) and environmental concerns for bitumen production have contributed to the use of RAP in road construction and maintenance. The use of higher than 15% of RAP adversely affects the physical and rheological properties of the asphalt binder and the mechanical properties of mixtures. Therefore, the use of bitumen and asphalt mixture improver were necessary to reduce the negative effects generated with the use of RAP. This paper aims to study the effect of fiberglass (FG) (0.5%, 1.0%, 1.5%, and 2%) on the mechanical properties of asphalt concrete containing 25%, 50% RAP and 9% waste engine oil. The performance of RAP asphalt mixtures incorporated with FG was evaluated using the Marshall stability test, moisture susceptibility test, and immersion wheel rutting test. The results indicated that the use of FG and RAP materials to rejuvenated asphalt mixtures resulted in an increase in the values of Marshall stability and rutting resistance. Moreover, the study revealed that increasing the content of RAP material and FG results in increased resistance of asphalt to moisture damage. This paper concluded that using 0.15% of FG and 50% RAP materials gives the best results