Laboratory investigation of the effect of pollution Absorbing NaHCO₃ on the environmental and mechanical properties of hot mix asphalt containing sulfur

Articles in Press

Document Type : Original Article

Authors

1 Department of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran

2 civil engineering department, semnan university, semnan, iran

3 Sadra university

4 Azad university (Arak branch)

10.22034/tri.2022.300084.2936

Abstract

Nowadays, low-cost and waste materials in pavement industry have been used by researchers to improve the quality of road pavement. Sulfur is one of the cheap and durable materials that is used in different industries including construction engineering field. This project aimed to assess the characteristics (environmental and mechanical properties) of asphalt mixtures incorporating sulfur, in which the sulfur contains the Sodium Bicarbonate (eliminating the disgusting smell of sulfur). In this regard, the mechanical-strength based tests like rutting, elastic modulus, Marshal stability, moisture susceptibility, fatigue (indirect tensile test) and environmental-related tests about polluting gas emission (CO, SO2, H2S, NO2) were done on control specimens, sulfur modified asphalt mixture, sulfur modified asphalt mixture containing pollution absorbing additives. The results indicate that the performance tests of the asphalt mixture containing sulfur had a significant increase compared to the control sample; So that the rut depth of sulfur asphalt decreased by 42% compared to the control sample, the modulus of resistance of sulfur asphalt increased by 6%, the fatigue life of sulfur asphalt increased 3.63 times compared to the control asphalt and finally the ratio of indirect tension strength after freeze and thaw cycle, the modified asphalt mixture with sulfur is 20% more than the control asphalt The outcomes of this research showed that the sulfur enhanced the mechanical properties completely, and the environment-related test also revealed that sulfur modified asphalt mixture can be categorized as standard air and it is possible to use it in the pavement industry. While the effect of sodium bicarbonate on the environmental properties and most mechanical parameters of asphalt containing processed sulfur is positive, but reduces the resistance to the freeze and thaw cycle.

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Journal of Transportation Research

Articles in Press, Accepted Manuscript
Available Online from 08 May 2022

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