4.7 Article

Dodecylbenzenesulfonic Acid as a Bitumen Modifier: A Novel Approach To Enhance Rheological Properties of Bitumen

Journal

ENERGY & FUELS
Volume 31, Issue 5, Pages 5003-5010

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.7b00419

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Funding

  1. MINECO-FEDER Programme [CTQ2014-56980-R]
  2. Consejeria de Innovacion, Ciencia y Empresa, Junta de Andalucia (Projects of Excellence Programme) [TEP-6689]

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Bitumen deterioration has been traditionally overcome by its modification with polymers, sometimes producing unstable blends as a result of their mutual lack of affinity. A new and different approach based on the use of dodecylbenzenesulfonic acid (DBSA) is herein reported. DSBA is a surfactant that contains a strong acid group capable of interacting with asphaltene molecules, commonly used as a dispersing agent for asphaltenes in crude oils. However, the contrary effect can also be obtained, as long as a critical concentration is not surpassed. In this work, the influence that the additive concentration and processing temperature exert on the thermomechanical behavior of DBSA-modified bitumen has been assessed by means of rheological, thermal, and thermogravimetric analyses. Within the concentration range used (0.4-3 wt %), the attachment of DBSA to asphaltene molecules promoted the association of asphaltene molecules/aggregates into larger clusters in bitumen, with 3 wt % DBSA noticeably improving rheological properties of bitumen.

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