Sahar Basim Al-ghurabi, Esraa R. Al-gurah* and Walaa Mohammed Hamza
Assessment of indirect tensile stress and
tensile–strength ratio and creep compliance
in HMA mixes with micro-silica and PMB
https://doi.org/10.1515/eng-2022-0527
received June 08, 2023; accepted September 01, 2023
Abstract: This study aims to ascertain the effects of
polymer-modified bitumen (PMB) and to utilize mineral
filler with micro-silica (MS) on various properties of hotmix
asphalt (HMA). In this work, three specimens of an
asphalt-concrete mixture were prepared. The first specimen
represents a control mixture, the second specimen contains
MS at rates 15, 30, and 45% by the total weight of the total
aggregate as filler, and the third specimen contains MS and
PMB with 4% novolac by the weight of bitumen and 15%
hexamine by the weight of the novolac. The properties of
designed mixes were evaluated using the indirect tensile
strength test, tensile–strength ratio, and creep compliance.
The test results showed an increase in the resistance of
asphalt concrete to moisture damage, a reduction influence
of water on asphalt concrete properties, creep compliance
values indicating growing stiffness for asphalt mixture, and
enhanced fatigue life. In conclusion, using 45% MS and PMB
improved the properties of HMA and provided long-lasting
mixtures for highway construction.
Keywords: creep compliance, hot-mix asphalt, indirect tensile
strength, micro-silica, polymer-modified bitumen
1 Introduction
Asphalt pavements