Abstract
Abstract: This paper investigates the laboratory properties of tire crumb rubber modified (CRM) bitumen mixture. Two types of mixtures containing two binders (pen90 bitumen; CRM bitumen) were used to produce Marshall Sample and determine optimum content. Mechanical performances of bituminous mixtures were evaluated by Chinese wheel rutting test (WRT), 3point beam bending test (3P-BBT) at low temperature, indirect tensile Strength test (ITST) at freezing-thawing cycles. Superpave gyratory compactor (SGC) specimens also were prepared for modulus test. Resilient modulus (E) data were obtained by unconfined uni-axial compression test according to the specification of China. Dynamic modulus (E★) data were obtained by Simple Performance Test (SPT). Two temperatures were used at dynamic modulus test. The results indicate that CRM bituminous mixture performs better than referenced bituminous mixture on viscoelastic behavior, rutting resistance, cracking resistance and moisture stability.
Highlights
In recent years, crumb rubber modification within a wide range of contents and sizes has been done to improve asphalt performance at pavement service temperatures
Marshall Method still is used for mix design of the crumb rubber modified (CRM) asphalt mixture
For the further study on the rutting resistance and the fatigue resistance of CRM asphalt mixture, the rutting factor (E*/sinδ) and the fatigue factor (E*·cosδ) are achieved by SHRP calculation method based on dynamic modulus and phase angle
Summary
Crumb rubber modification within a wide range of contents and sizes has been done to improve asphalt performance at pavement service temperatures. The ability of crumb rubber to improve the mix properties depends on many factors, including the incorporation technology, nature of the rubber, size of the rubber particles, and the percentage of rubber in the mix and its reaction time with asphalt. Field studies have shown that crumb rubber modification of asphalts can improve the asphalt pavement performance [1, 2, 3, 4]. The use of crumb rubber modifiers with asphalt binders seems to enhance the fatigue resistance, as illustrated in a number of studies [5, 6, 7, 8]. The improved performance of asphalt rubber pavements compared with conventional asphalt pavements has partly resulted from improved rheological properties of the asphalt–rubber binder. The viscoelastic properties of CRM asphalt mixture are investigated by SPT
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