Temperature Dependency of the Stiffening Effect of Hydrated Lime in Stone Mastic Asphalt (SMA) Mixtures

Cardenas, Mariella; Carvajal-Munoz, Juan S.; Airey, Gordon

Abstract

The effect of hydrated lime (HL) on the stiffening effect of bituminous mixtures is mainly driven by a physical phenomenon derived from the higher Rigden Air Voids (RAV) of HL in contrast to other filler types commonly used in bituminous mixtures such as granite and limestone. The stiffening effects of HL at room temperature for some mixture types have been reported in the literature but the knowledge of the effects on Stone Mastic Asphalt (SMA) mixtures is still limited. Similarly, the temperature-dependency has been theorised in the literature but scarce experimental evidence is currently available. As a consequence, this research focuses on studying the effects of a wide range of temperatures on the stiffening effect of SMA mixtures with HL. Indirect Tensile Stiffness Modulus (ITSM) testing was used in order to assess the stiffness properties of SMA mixtures manufactured with limestone aggregates, a conventional 30/45-penetration grade bitumen, and the addition of HL as a partial replacement of limestone filler (LF). The bitumen to filler ratio was kept as 1:1 for all manufactured mixtures. The results indicated: (i) a clear temperature-dependency of the stiffening effect of HL, which is more prominent at intermediate temperatures (20 and 30°C). (ii) The percentage of added HL and the average stiffness of the specimens had an approximately linear correlation. (iii) The stiffening effect is less prominent at the lower and higher temperatures considered. (iv) The partial replacement of LF by HL produced stiffer mixtures than those without replacement, which suggests improved mechanical response of these SMA mixtures.

Citation

Cardenas, M., Carvajal-Munoz, J. S., & Airey, G. (2020, December). Temperature Dependency of the Stiffening Effect of Hydrated Lime in Stone Mastic Asphalt (SMA) Mixtures. Presented at ISBM Lyon 2020, Lyon, France

• Presentation Conference Type: Edited Proceedings
• Conference Name: ISBM Lyon 2020
• Start Date: Dec 14, 2020
• End Date: Dec 16, 2020
• Acceptance Date: Jul 1, 2021
• Online Publication Date: Sep 26, 2021
• Publication Date: 2022
• Deposit Date: Jan 31, 2022
• Publicly Available Date: Sep 27, 2022
• Peer Reviewed: Not Peer Reviewed
• Pages: 1743-1749
• Series Title: RILEM Bookseries
• Series Number: 27
• Series ISSN: 2211-0844
• Book Title: Proceedings of the RILEM International Symposium on Bituminous Materials: ISBM 2020
• ISBN: 9783030464547
• DOI: https://doi.org/10.1007/978-3-030-46455-4_221
• Public URL: https://nottingham-repository.worktribe.com/output/7350071
• Publisher URL: https://link.springer.com/chapter/10.1007/978-3-030-46455-4_221
• Related Public URLs: https://isbmlyon2020.sciencesconf.org/