Synergy Effect of Attapulgite, Rubber, and Diatomite on Organic Montmorillonite-Modified Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 2
Abstract
Organic montmorillonite (OMMT) was obtained by reacting montmorillonite (MMT) with the surfactant cetyltrimethyl ammonium bromide (CTAB). The crystalline phases of MMT and OMMT were characterized by microscopic performance analysis using an X-ray diffractometer (XRD) and scanning electron microscope (SEM). The effects of rubber, attapulgite, columnar diatomite, and disk diatomite on the technological and rheological properties of OMMT-modified asphalt were studied using a dynamic shear rheometer, and the low-temperature properties were determined from their creep characteristics by a bending beam rheometer. The short-term, long-term, and ultraviolet (UV) aging of modified asphalt were tested, respectively. After adding five types of modifiers to the asphalt, the high-temperature rheological and aging resistance of matrix asphalt and modified asphalt can be improved. In particular, it is shown that modification with OMMT with attapulgite as comodifier had a positive influence on asphalt thermo-oxidative aging and UV aging.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (51704040), the Scientific Research Project of Hunan Provincial Department of Education (16B007), and Open Fund of Key Laboratory of Special Environment Road Engineering of Hunan Province (Changsha University of Science and Technology, KFJ160501, 170502).
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 2 • February 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 16, 2017
Accepted: Aug 9, 2018
Published online: Nov 30, 2018
Published in print: Feb 1, 2019
Discussion open until: Apr 30, 2019
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