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Characterization of chemical reactivity of liquid antistripping additives using potentiometric titration and FTIR spectroscopy
Faculty of Technology, Makerere University, Kampala.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
2006 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 20, no 5, 2174-2180 p.Article in journal (Refereed) Published
Abstract [en]

Chemical reactivity of two liquid antistripping additives mixed with two bitumens of diverse acid numbers was evaluated. Additives present in the blends were detected by use of potentiometric titration and infrared spectroscopy. Tests were done at dosages of 0, 0.5, 1.0, and 2.0%; storage temperatures of 25, 100, 140, and 150 degrees C; and storage times of 1, 24, and 72 h. At 0.5% dosage, close to typical field values, the more basic additive mixed with bitumen of high acid number almost ceased to be detected after 24 h of storage at 140 degrees C. The less basic additive could be detected beyond these conditions, irrespective of the bitumen used. At higher dosages, reactions with the bitumens were found to be more pronounced with the more basic additive. The reactions between the additives and bitumens studied seemed to be higher in the bitumen with higher acid number, irrespective of the dosage. Statistical analysis indicated that all the parameters studied significantly affected change in amount of additives detected in the blends. A correlation was established between potentiometric titration and infrared spectroscopy in detecting amine additives. This correlation notwithstanding, infrared spectroscopy was found to not be a good tool for measuring amines in the blends, especially at low concentrations.

Place, publisher, year, edition, pages
2006. Vol. 20, no 5, 2174-2180 p.
Keyword [en]
Bitumens, Chemical reactivity, Liquid antistripping additives, Potentiometric titration, Acidity, Amines, Blending, Fourier transform infrared spectroscopy, Titration, Additives
National Category
Reliability and Maintenance
URN: urn:nbn:se:kth:diva-8935DOI: 10.1021/ef050397yISI: 000240615500062ScopusID: 2-s2.0-33749625913OAI: diva2:14425
QC 20100831. Tidigare titel: Characterization of thermal stability of liquid anti-stripping additives using potentiometric titration and FTIR spectroscopy. Titel ändrad och uppdaterad från Submitted till Published 20100831.Available from: 2005-12-14 Created: 2005-12-14 Last updated: 2010-12-08Bibliographically approved
In thesis
1. Investigations on moisture damage-related behaviour of bituminous materials
Open this publication in new window or tab >>Investigations on moisture damage-related behaviour of bituminous materials
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This doctoral thesis presents results of literature review on classical and contemporary aspects of stripping, as well as experimental investigations on moisture damage as influenced by bituminous materials.

Previous research in the area of moisture damage was reviewed and synthesized into a state-of-the-art. Important parameters linked to moisture sensitivity, like bituminous material characteristics, dynamic loads from heavy vehicles, environmental factors, construction practice and nature of anti-stripping additives, are presented. The state-of-the-art in current test methods is summarized and given.

The experimental work involved investigations of the influence of bitumen and aggregate composition on water susceptibility. The influence of aggregate mineralogy and chemistry was evaluated using eleven aggregates and one bitumen, followed by studying the interactive effect of four bitumens and four aggregates. Moisture sensitivity was evaluated in accordance with (EN 12697-12:2003) for conditioning, ASTM D 4123 for resilient modulus determination, and (EN 12697-23:2003) for indirect tensile strength testing. Furthermore, thermal stability of two liquid amine anti-stripping additives mixed with two bitumens of varied acidity was investigated using potentiometric titration and Fourier Transform Infrared (FTIR) Spectroscopy. Lastly, a technique based on Fourier Transform Infrared Spectroscopy-Attenuated Total Reflectance (FTIR-ATR) was developed and used for studying transport of water across thin bitumen films, as well as stripping at bitumen/substrate interfaces. Bitumens from different sources and three substrates (silicon, germanium and zinc selenide crystals) were used. Based on the results obtained, it was concluded that aggregates containing sodium and potassium in alkali feldspars generally showed high moisture sensitivity. In contrast, presence of calcium, magnesium and iron was associated with aggregates with low moisture sensitivity. Contrary to several previous findings, one aggregate with practically 100% quartz exhibited low moisture sensitivity. No linear relationship between moisture sensitivity and the contents of SiO2 and Al2O3 in the aggregates studied was established. Results of the interactive influence of bitumen and aggregate composition showed that high acid and low penetration bitumens exhibited high dry strength for all the aggregates studied. On the other hand, for a given bitumen, the wet strengths were found to be aggregate specific.

The results of tests on thermal stability of amine additives showed that usefulness of these additives reduces considerably, when the more alkaline additive was mixed with the high acid bitumen, followed by storing the blends under pronounced conditions of time and temperature (24 hours and 140ºC, or more, in this study). Much less interaction occurred when the less alkaline additive was blended with the low acid bitumen. Even if a correlation was found between the results of potentiometric titration and Fourier Transform Infrared spectroscopy, the latter was not considered good enough at detecting amine additives, especially at low dosages.

The technique based on FTIR-ATR developed in this study distinguished between good and bad bitumens with regard to stripping. The effectiveness of amine-based additives in reducing stripping was also shown by the method. Three likely processes occurred during the test, namely water diffusion, film break, and displacement (stripping) of bitumen from the substrate surface. The results also indicated that the diffusion process of water into the bitumen/substrate interface does not obey Fick’s law.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. ii, 40 p.
Trita-VT. FR, ISSN 1650-867X ; 2005:02
Moisture damage, State-of-the-Art, Stripping, Moisture sensitivity, Bituminous materials
National Category
Reliability and Maintenance
urn:nbn:se:kth:diva-556 (URN)
Public defence
2005-12-20, Sal F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
QC 20100831Available from: 2005-12-14 Created: 2005-12-14 Last updated: 2010-08-31Bibliographically approved

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