01024859

Component

https://doi.org/10.3141/1962-13

http://scholar.google.com...heff&publication_year=2006

Lime is added to hot-mix asphalt to mitigate stripping and other modes of moisture damage. No standard forensic test exists for the measurement of the lime content after it has been incorporated in the asphalt. This paper evaluates several methods to quantify the amount of hydrated lime (calcium hydroxide) in asphalt. A rapid analytical technique, Fourier transform infrared spectroscopy, was identified for determining the quality and quantity of lime. It yields qualitative or semiquantitative results from samples as small as 10 mg. No sample preparation is involved, and the binder can be scraped directly from large stones in the hot mix. The analysis can be completed in 30 s and offers the possibility of timely adjustment to the mix. For more accurate quantitative measurement, a second procedure is recommended. Samples are taken from cores with a hammer drill. The lime is separated from the resulting dust by acid extraction, and the calcium level is determined by atomic absorption spectroscopy or ion exchange chromatography. Different methods for removing the binder are discussed.

01036740

English

pp 113-120

2006

Transportation Research Record: Journal of the Transportation Research Board

0309099714

Print

Figures (10) ; Tables (6)

Absorption spectroscopy; Asphalt mixtures; Calcium hydroxide; Hot mix asphalt; Infrared spectroscopy; Ion exchange chromatography; Quantitative analysis

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Mar 3 2006 10:51AM

• Analysis of Premature Low-Temperature Cracking in Three Ontario, Canada, Pavements
• Binder Oxidative Aging in Texas Pavements: Hardening Rates, Hardening Susceptibilities, and Impact of Pavement Depth
• Characterization of Aggregate Resistance to Degradation in Stone Matrix Asphalt Mixtures
• Compact Tension Testing of Asphalt Binders at Low Temperatures
• Comparing Fine Aggregate Angularity with Aggregate and Hot-Mix Asphalt Performance Tests
• Controlling Performance of Crumb Rubber-Modified Binders Through Addition of Polymer Modifiers
• Evaluating Recycled Asphalt Pavement Mixtures with Mechanistic–Empirical Pavement Design Guide Level 3 Analysis
• High-Pressure Gel Permeation Chromatography of Aging of Recycled Crumb Rubber-Modified Binders With Rejuvenating Agents
• Low-Energy Asphalt with Performance of Hot-Mix Asphalt
• Low-Temperature Thermal Cracking of Asphalt Binder by Asphalt Binder Cracking Device
• Nonlinearity of Repeated Creep and Recovery Binder Test and Relationship with Mixture Permanent Deformation
• Recycling of Laboratory-Prepared Reclaimed Asphalt Pavement Mixtures Containing Crumb Rubber-Modified Binders in Hot-Mix Asphalt