Evaluation of the Effect of Zycotherm on Moisture Susceptibility of Warm Mix Asphalt Containing Crumb Rubber

Document Type : Research Article

Authors

1 Associate Professor

2 Msc. student

3 Ph.d Student of Road & Transportation Engineering,Department of Civil & Environmental Engineering, Amirkabir University ofTechnology

Abstract

Reducing the temperature of asphalt mixture production is one of the essential benefits of using warm mix asphalt, but this advantage also causes some pavement problems. One of the most critical issues is creating a higher moisture potential in road pavement due to asphalt mixtures’ lower production temperatures. Subsequently, some of the aggregate moisture does not evaporate. This study aims to evaluate the effect of zycotherm on the moisture reduction of warm mix asphalt. Besides, Waste crumbs replaced some of the fine-grained aggregates. Materials include different percentages of Zycotherm (0.1, 0.15, and 0.2% by total weight of bitumen) and crumb rubber (0, 10, and 20% by total weight of the fine aggregate) bitumen 60/70 and granite sum make nine mix designs. Experiments include Boiling Water Test, Indirect Tensile Test; And Resilient Modulus (MR) Test evaluated the asphalt mixture’s moisture sensitivity. The boiling water test results showed that the increase in Zycotherm improves moisture susceptibility. However, the crude rubber does not significantly affect boiling water tests because of the Crumb rubber’s lower density of aggregates, despite the apparent improvement in the bitumen adhesion to the sum. Resilient modulus, a model for predicting tensile strength ratio (TSR), was made based on the experimental results using one-way ANOVA. The minimum required percentage of Zycotherm for replacing 10% of the crumb rubber was 0.128%. For 20% of the crumb rubber, it is equal to 0.149%. According to the resilient modulus results, the addition of a Zycotherm increases MR, while the crumb rubber’s substitution causes a slight increase in MR

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References

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Amirkabir Journal of Civil Engineering
Volume 52, Issue 3
June 2020
Pages 641-654

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