PERMANENT DEFORMATION OF BITUMINOUS MIXTURES INCORPORATING HYDRATED LIME (HL) AND ORDINARY PORTLAND CEMENT (OPC) AS FILLER MATERIAL

This study focuses on comparing the engineering
characteristics of asphalt concrete mixtures using Hydrated
Lime (HL) and Ordinary Portland Cement (OPC) as mineral
fillers to improve the performance of asphalt concrete
mixtures. The fundamental engineering properties of the
mixtures were determined through the Marshall mix design
,whilst the performance properties were determined through
the Wheel Tracking and Dynamic Creep Test. The results of
the laboratory investigation would reveal the advantages of
using these materials as filler. The smaller particle size as well
as the irregular shape of the HL as shown by the Scanning
Electron Microscopy (SEM) test contributed to good
interlocking of the aggregates in the mixtures. This was not
observed in mixtures with OPC filler which displayed a
spherical particle shape. The X-Ray Diffraction (XRD) test
revealed that the HL particle had higher capacity to diffract
the rays, denoting that it is a stronger material particle than
the OPC. The Wheel Tracking test results showed that HL
mixtures undergo less deformation than then OPC mixtures.
A similar trend was observed in the Dynamic Creep Test.